/* DIGEST-MD5 SASL plugin * Rob Siemborski * Tim Martin * Alexey Melnikov * $Id: digestmd5.c,v 1.5 2003/02/25 00:00:30 snsimon Exp $ */ /* * Copyright (c) 2001 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any other legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #ifndef macintosh #include #include #endif #include #include /* DES support */ #ifdef WITH_DES # ifdef WITH_SSL_DES # include # else /* system DES library */ # include # endif #endif /* WITH_DES */ #ifdef WIN32 # include #else /* Unix */ # include #endif /* WIN32 */ #include #include #include "plugin_common.h" #ifdef WIN32 /* This must be after sasl.h, saslutil.h */ #include "saslDIGESTMD5.h" #else /* Unix */ extern int strcasecmp(const char *s1, const char *s2); #endif /* end WIN32 */ #ifdef macintosh #include #endif /* external definitions */ #ifdef sun /* gotta define gethostname ourselves on suns */ extern int gethostname(char *, int); #endif #define bool int #ifndef TRUE #define TRUE (1) #define FALSE (0) #endif /***************************** Common Section *****************************/ static const char plugin_id[] = "$Id: digestmd5.c,v 1.5 2003/02/25 00:00:30 snsimon Exp $"; /* Definitions */ #define NONCE_SIZE (32) /* arbitrary */ /* Layer Flags */ #define DIGEST_NOLAYER (1) #define DIGEST_INTEGRITY (2) #define DIGEST_PRIVACY (4) /* defines */ #define HASHLEN 16 typedef unsigned char HASH[HASHLEN + 1]; #define HASHHEXLEN 32 typedef unsigned char HASHHEX[HASHHEXLEN + 1]; #define MAC_SIZE 10 #define MAC_OFFS 2 const char *SEALING_CLIENT_SERVER="Digest H(A1) to client-to-server sealing key magic constant"; const char *SEALING_SERVER_CLIENT="Digest H(A1) to server-to-client sealing key magic constant"; const char *SIGNING_CLIENT_SERVER="Digest session key to client-to-server signing key magic constant"; const char *SIGNING_SERVER_CLIENT="Digest session key to server-to-client signing key magic constant"; #define HT (9) #define CR (13) #define LF (10) #define SP (32) #define DEL (127) /* function definitions for cipher encode/decode */ typedef int cipher_function_t(void *, const char *, unsigned, unsigned char[], char *, unsigned *); typedef int cipher_init_t(void *, char [16], char [16]); typedef void cipher_free_t(void *); enum Context_type { SERVER = 0, CLIENT = 1 }; #ifdef WITH_RC4 typedef struct rc4_context_s rc4_context_t; #endif /* context that stores info used for fast reauth */ typedef struct global_context { /* common stuff */ char *authid; char *realm; unsigned char *nonce; unsigned int nonce_count; unsigned char *cnonce; /* client stuff */ char *serverFQDN; char *qop; struct digest_cipher *bestcipher; unsigned int server_maxbuf; } global_context_t; /* context that stores info */ typedef struct context { int state; /* state in the authentication we are in */ enum Context_type i_am; /* are we the client or server? */ global_context_t *global; char *response_value; unsigned int seqnum; unsigned int rec_seqnum; /* for checking integrity */ HASH Ki_send; HASH Ki_receive; HASH HA1; /* Kcc or Kcs */ /* copy of utils from the params structures */ const sasl_utils_t *utils; /* For general use */ char *out_buf; unsigned out_buf_len; /* for encoding/decoding */ buffer_info_t *enc_in_buf; char *encode_buf, *decode_buf, *decode_once_buf; unsigned encode_buf_len, decode_buf_len, decode_once_buf_len; char *decode_tmp_buf; unsigned decode_tmp_buf_len; char *MAC_buf; unsigned MAC_buf_len; char *buffer; char sizebuf[4]; int cursize; int size; int needsize; /* Server MaxBuf for Client or Client MaxBuf For Server */ unsigned int maxbuf; /* if privacy mode is used use these functions for encode and decode */ cipher_function_t *cipher_enc; cipher_function_t *cipher_dec; cipher_init_t *cipher_init; cipher_free_t *cipher_free; #ifdef WITH_DES des_key_schedule keysched_enc; /* key schedule for des initialization */ des_cblock ivec_enc; /* initial vector for encoding */ des_key_schedule keysched_dec; /* key schedule for des initialization */ des_cblock ivec_dec; /* init vec for decoding */ des_key_schedule keysched_enc2; /* key schedule for 3des initialization */ des_key_schedule keysched_dec2; /* key schedule for 3des initialization */ #endif #ifdef WITH_RC4 rc4_context_t *rc4_enc_context; rc4_context_t *rc4_dec_context; #endif /* WITH_RC4 */ } context_t; struct digest_cipher { char *name; sasl_ssf_t ssf; int n; /* bits to make privacy key */ int flag; /* a bitmask to make things easier for us */ cipher_function_t *cipher_enc; cipher_function_t *cipher_dec; cipher_init_t *cipher_init; cipher_free_t *cipher_free; }; static const unsigned char *COLON = ":"; static void CvtHex(HASH Bin, HASHHEX Hex) { unsigned short i; unsigned char j; for (i = 0; i < HASHLEN; i++) { j = (Bin[i] >> 4) & 0xf; if (j <= 9) Hex[i * 2] = (j + '0'); else Hex[i * 2] = (j + 'a' - 10); j = Bin[i] & 0xf; if (j <= 9) Hex[i * 2 + 1] = (j + '0'); else Hex[i * 2 + 1] = (j + 'a' - 10); } Hex[HASHHEXLEN] = '\0'; } /* * calculate request-digest/response-digest as per HTTP Digest spec */ void DigestCalcResponse(const sasl_utils_t * utils, HASHHEX HA1, /* H(A1) */ unsigned char *pszNonce, /* nonce from server */ unsigned int pszNonceCount, /* 8 hex digits */ unsigned char *pszCNonce, /* client nonce */ unsigned char *pszQop, /* qop-value: "", "auth", * "auth-int" */ unsigned char *pszDigestUri, /* requested URL */ unsigned char *pszMethod, HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ HASHHEX Response /* request-digest or response-digest */ ) { MD5_CTX Md5Ctx; HASH HA2; HASH RespHash; HASHHEX HA2Hex; char ncvalue[10]; /* calculate H(A2) */ utils->MD5Init(&Md5Ctx); if (pszMethod != NULL) { utils->MD5Update(&Md5Ctx, pszMethod, strlen((char *) pszMethod)); } utils->MD5Update(&Md5Ctx, (unsigned char *) COLON, 1); /* utils->MD5Update(&Md5Ctx, (unsigned char *) "AUTHENTICATE:", 13); */ utils->MD5Update(&Md5Ctx, pszDigestUri, strlen((char *) pszDigestUri)); if (strcasecmp((char *) pszQop, "auth") != 0) { /* append ":00000000000000000000000000000000" */ utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); } utils->MD5Final(HA2, &Md5Ctx); CvtHex(HA2, HA2Hex); /* calculate response */ utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, HA1, HASHHEXLEN); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszNonce, strlen((char *) pszNonce)); utils->MD5Update(&Md5Ctx, COLON, 1); if (*pszQop) { sprintf(ncvalue, "%08x", pszNonceCount); utils->MD5Update(&Md5Ctx, ncvalue, strlen(ncvalue)); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszCNonce, strlen((char *) pszCNonce)); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszQop, strlen((char *) pszQop)); utils->MD5Update(&Md5Ctx, COLON, 1); } utils->MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); utils->MD5Final(RespHash, &Md5Ctx); CvtHex(RespHash, Response); } static bool UTF8_In_8859_1(const unsigned char *base, int len) { const unsigned char *scan, *end; end = base + len; for (scan = base; scan < end; ++scan) { if (*scan > 0xC3) break; /* abort if outside 8859-1 */ if (*scan >= 0xC0 && *scan <= 0xC3) { if (++scan == end || *scan < 0x80 || *scan > 0xBF) break; } } /* if scan >= end, then this is a 8859-1 string. */ return (scan >= end); } /* * if the string is entirely in the 8859-1 subset of UTF-8, then translate to * 8859-1 prior to MD5 */ void MD5_UTF8_8859_1(const sasl_utils_t * utils, MD5_CTX * ctx, bool In_ISO_8859_1, const unsigned char *base, int len) { const unsigned char *scan, *end; unsigned char cbuf; end = base + len; /* if we found a character outside 8859-1, don't alter string */ if (!In_ISO_8859_1) { utils->MD5Update(ctx, base, len); return; } /* convert to 8859-1 prior to applying hash */ do { for (scan = base; scan < end && *scan < 0xC0; ++scan); if (scan != base) utils->MD5Update(ctx, base, scan - base); if (scan + 1 >= end) break; cbuf = ((scan[0] & 0x3) << 6) | (scan[1] & 0x3f); utils->MD5Update(ctx, &cbuf, 1); base = scan + 2; } while (base < end); } static void DigestCalcSecret(const sasl_utils_t * utils, unsigned char *pszUserName, unsigned char *pszRealm, unsigned char *Password, int PasswordLen, HASH HA1) { bool In_8859_1; MD5_CTX Md5Ctx; /* Chris Newman clarified that the following text in DIGEST-MD5 spec is bogus: "if name and password are both in ISO 8859-1 charset" We shoud use code example instead */ utils->MD5Init(&Md5Ctx); /* We have to convert UTF-8 to ISO-8859-1 if possible */ In_8859_1 = UTF8_In_8859_1(pszUserName, strlen((char *) pszUserName)); MD5_UTF8_8859_1(utils, &Md5Ctx, In_8859_1, pszUserName, strlen((char *) pszUserName)); utils->MD5Update(&Md5Ctx, COLON, 1); if (pszRealm != NULL && pszRealm[0] != '\0') { /* a NULL realm is equivalent to the empty string */ utils->MD5Update(&Md5Ctx, pszRealm, strlen((char *) pszRealm)); } utils->MD5Update(&Md5Ctx, COLON, 1); /* We have to convert UTF-8 to ISO-8859-1 if possible */ In_8859_1 = UTF8_In_8859_1(Password, PasswordLen); MD5_UTF8_8859_1(utils, &Md5Ctx, In_8859_1, Password, PasswordLen); utils->MD5Final(HA1, &Md5Ctx); } static unsigned char *create_nonce(const sasl_utils_t * utils) { unsigned char *base64buf; int base64len; char *ret = (char *) utils->malloc(NONCE_SIZE); if (ret == NULL) return NULL; utils->rand(utils->rpool, (char *) ret, NONCE_SIZE); /* base 64 encode it so it has valid chars */ base64len = (NONCE_SIZE * 4 / 3) + (NONCE_SIZE % 3 ? 4 : 0); base64buf = (unsigned char *) utils->malloc(base64len + 1); if (base64buf == NULL) { utils->seterror(utils->conn, 0, "Unable to allocate final buffer"); utils->free(ret); return NULL; } /* * Returns SASL_OK on success, SASL_BUFOVER if result won't fit */ if (utils->encode64(ret, NONCE_SIZE, (char *) base64buf, base64len, NULL) != SASL_OK) { utils->free(ret); utils->free(base64buf); return NULL; } utils->free(ret); return base64buf; } static int add_to_challenge(const sasl_utils_t *utils, char **str, unsigned *buflen, unsigned *curlen, char *name, unsigned char *value, bool need_quotes) { int namesize = strlen(name); int valuesize = strlen((char *) value); int ret; ret = _plug_buf_alloc(utils, str, buflen, *curlen + 1 + namesize + 2 + valuesize + 2); if(ret != SASL_OK) return ret; *curlen = *curlen + 1 + namesize + 2 + valuesize + 2; strcat(*str, ","); strcat(*str, name); if (need_quotes) { strcat(*str, "=\""); strcat(*str, (char *) value); /* XXX. What about quoting??? */ strcat(*str, "\""); } else { strcat(*str, "="); strcat(*str, (char *) value); } return SASL_OK; } static char *skip_lws (char *s) { if(!s) return NULL; /* skipping spaces: */ while (s[0] == ' ' || s[0] == HT || s[0] == CR || s[0] == LF) { if (s[0]=='\0') break; s++; } return s; } static char *skip_token (char *s, int caseinsensitive) { if(!s) return NULL; while (s[0]>SP) { if (s[0]==DEL || s[0]=='(' || s[0]==')' || s[0]=='<' || s[0]=='>' || s[0]=='@' || s[0]==',' || s[0]==';' || s[0]==':' || s[0]=='\\' || s[0]=='\'' || s[0]=='/' || s[0]=='[' || s[0]==']' || s[0]== '?' || s[0]=='=' || s[0]== '{' || s[0]== '}') { if (caseinsensitive == 1) { if (!isupper((unsigned char) s[0])) break; } else { break; } } s++; } return s; } /* NULL - error (unbalanced quotes), otherwise pointer to the first character after value */ static char *unquote (char *qstr) { char *endvalue; int escaped = 0; char *outptr; if(!qstr) return NULL; if (qstr[0] == '"') { qstr++; outptr = qstr; for (endvalue = qstr; endvalue[0] != '\0'; endvalue++, outptr++) { if (escaped) { outptr[0] = endvalue[0]; escaped = 0; } else if (endvalue[0] == '\\') { escaped = 1; outptr--; /* Will be incremented at the end of the loop */ } else if (endvalue[0] == '"') { break; } else { outptr[0] = endvalue[0]; } } if (endvalue[0] != '"') { return NULL; } while (outptr <= endvalue) { outptr[0] = '\0'; outptr++; } endvalue++; } else { /* not qouted value (token) */ endvalue = skip_token(qstr,0); }; return endvalue; } static void get_pair(char **in, char **name, char **value) { char *endpair; /* int inQuotes; */ char *curp = *in; *name = NULL; *value = NULL; if (curp == NULL) return; if (curp[0] == '\0') return; /* skipping spaces: */ curp = skip_lws(curp); *name = curp; curp = skip_token(curp,1); /* strip wierd chars */ if (curp[0] != '=' && curp[0] != '\0') { *curp++ = '\0'; }; curp = skip_lws(curp); if (curp[0] != '=') { /* No '=' sign */ *name = NULL; return; } curp[0] = '\0'; curp++; curp = skip_lws(curp); *value = (curp[0] == '"') ? curp+1 : curp; endpair = unquote (curp); if (endpair == NULL) { /* Unbalanced quotes */ *name = NULL; return; } if (endpair[0] != ',') { if (endpair[0]!='\0') { *endpair++ = '\0'; } } endpair = skip_lws(endpair); /* syntax check: MUST be '\0' or ',' */ if (endpair[0] == ',') { endpair[0] = '\0'; endpair++; /* skipping <,> */ } else if (endpair[0] != '\0') { *name = NULL; return; } *in = endpair; } #ifdef WITH_DES /****************************** * * 3DES functions * *****************************/ static int dec_3des(void *v, const char *input, unsigned inputlen, unsigned char digest[16], char *output, unsigned *outputlen) { context_t *text = (context_t *) v; int padding, p; des_ede2_cbc_encrypt((void *) input, (void *) output, inputlen, text->keysched_dec, text->keysched_dec2, &text->ivec_dec, DES_DECRYPT); /* now chop off the padding */ padding = output[inputlen - 11]; if (padding < 1 || padding > 8) { /* invalid padding length */ return SASL_FAIL; } /* verify all padding is correct */ for (p = 1; p <= padding; p++) { if (output[inputlen - 10 - p] != padding) { return SASL_FAIL; } } /* chop off the padding */ *outputlen = inputlen - padding - 10; /* copy in the HMAC to digest */ memcpy(digest, output + inputlen - 10, 10); return SASL_OK; } static int enc_3des(void *v, const char *input, unsigned inputlen, unsigned char digest[16], char *output, unsigned *outputlen) { context_t *text = (context_t *) v; int len; int paddinglen; /* determine padding length */ paddinglen = 8 - ((inputlen + 10) % 8); /* now construct the full stuff to be ciphered */ memcpy(output, input, inputlen); /* text */ memset(output+inputlen, paddinglen, paddinglen);/* pad */ memcpy(output+inputlen+paddinglen, digest, 10); /* hmac */ len=inputlen+paddinglen+10; des_ede2_cbc_encrypt((void *) output, (void *) output, len, text->keysched_enc, text->keysched_enc2, &text->ivec_enc, DES_ENCRYPT); *outputlen=len; return SASL_OK; } static int init_3des(void *v, char enckey[16], char deckey[16]) { context_t *text = (context_t *) v; if(des_key_sched((des_cblock *) enckey, text->keysched_enc) < 0) return SASL_FAIL; if(des_key_sched((des_cblock *) deckey, text->keysched_dec) < 0) return SASL_FAIL; if(des_key_sched((des_cblock *) (enckey+7), text->keysched_enc2) < 0) return SASL_FAIL; if(des_key_sched((des_cblock *) (deckey+7), text->keysched_dec2) < 0) return SASL_FAIL; memcpy(text->ivec_enc, ((char *) enckey) + 8, 8); memcpy(text->ivec_dec, ((char *) deckey) + 8, 8); return SASL_OK; } /****************************** * * DES functions * *****************************/ static int dec_des(void *v, const char *input, unsigned inputlen, unsigned char digest[16], char *output, unsigned *outputlen) { context_t *text = (context_t *) v; int p,padding = 0; des_cbc_encrypt((void *) input, (void *) output, inputlen, text->keysched_dec, &text->ivec_dec, DES_DECRYPT); /* Update the ivec (des_cbc_encrypt implementations tend to be broken in this way) */ memcpy(text->ivec_dec, input + (inputlen - 8), 8); /* now chop off the padding */ padding = output[inputlen - 11]; if (padding < 1 || padding > 8) { /* invalid padding length */ return SASL_FAIL; } /* verify all padding is correct */ for (p = 1; p <= padding; p++) { if (output[inputlen - 10 - p] != padding) { return SASL_FAIL; } } /* chop off the padding */ *outputlen = inputlen - padding - 10; /* copy in the HMAC to digest */ memcpy(digest, output + inputlen - 10, 10); return SASL_OK; } static int enc_des(void *v, const char *input, unsigned inputlen, unsigned char digest[16], char *output, unsigned *outputlen) { context_t *text = (context_t *) v; int len; int paddinglen; /* determine padding length */ paddinglen= 8 - ((inputlen+10)%8); /* now construct the full stuff to be ciphered */ memcpy(output, input, inputlen); /* text */ memset(output+inputlen, paddinglen, paddinglen);/* pad */ memcpy(output+inputlen+paddinglen, digest, 10); /* hmac */ len=inputlen+paddinglen+10; des_cbc_encrypt((void *) output, (void *) output, len, text->keysched_enc, &text->ivec_enc, DES_ENCRYPT); /* Update the ivec (des_cbc_encrypt implementations tend to be broken in this way) */ memcpy(text->ivec_enc, output + (len - 8), 8); *outputlen=len; return SASL_OK; } static int init_des(void *v, char enckey[16], char deckey[16]) { context_t *text = (context_t *) v; des_key_sched((des_cblock *) enckey, text->keysched_enc); memcpy(text->ivec_enc, ((char *) enckey) + 8, 8); des_key_sched((des_cblock *) deckey, text->keysched_dec); memcpy(text->ivec_dec, ((char *) deckey) + 8, 8); memcpy(text->ivec_enc, ((char *) enckey) + 8, 8); memcpy(text->ivec_dec, ((char *) deckey) + 8, 8); return SASL_OK; } #endif /* WITH_DES */ #ifdef WITH_RC4 /* quick generic implementation of RC4 */ struct rc4_context_s { unsigned char sbox[256]; int i, j; }; static void rc4_init(rc4_context_t *text, const unsigned char *key, unsigned keylen) { int i, j; /* fill in linearly s0=0 s1=1... */ for (i=0;i<256;i++) text->sbox[i]=i; j=0; for (i = 0; i < 256; i++) { unsigned char tmp; /* j = (j + Si + Ki) mod 256 */ j = (j + text->sbox[i] + key[i % keylen]) % 256; /* swap Si and Sj */ tmp = text->sbox[i]; text->sbox[i] = text->sbox[j]; text->sbox[j] = tmp; } /* counters initialized to 0 */ text->i = 0; text->j = 0; } static void rc4_encrypt(rc4_context_t *text, const char *input, char *output, unsigned len) { int tmp; int i = text->i; int j = text->j; int t; int K; const char *input_end = input + len; while (input < input_end) { i = (i + 1) % 256; j = (j + text->sbox[i]) % 256; /* swap Si and Sj */ tmp = text->sbox[i]; text->sbox[i] = text->sbox[j]; text->sbox[j] = tmp; t = (text->sbox[i] + text->sbox[j]) % 256; K = text->sbox[t]; /* byte K is Xor'ed with plaintext */ *output++ = *input++ ^ K; } text->i = i; text->j = j; } static void rc4_decrypt(rc4_context_t *text, const char *input, char *output, unsigned len) { int tmp; int i = text->i; int j = text->j; int t; int K; const char *input_end = input + len; while (input < input_end) { i = (i + 1) % 256; j = (j + text->sbox[i]) % 256; /* swap Si and Sj */ tmp = text->sbox[i]; text->sbox[i] = text->sbox[j]; text->sbox[j] = tmp; t = (text->sbox[i] + text->sbox[j]) % 256; K = text->sbox[t]; /* byte K is Xor'ed with plaintext */ *output++ = *input++ ^ K; } text->i = i; text->j = j; } static void free_rc4(void *v) { context_t *text = (context_t *) v; /* allocate rc4 context structures */ if(text->rc4_enc_context) text->utils->free(text->rc4_enc_context); if(text->rc4_dec_context) text->utils->free(text->rc4_dec_context); } static int init_rc4(void *v, char enckey[16], char deckey[16]) { context_t *text = (context_t *) v; /* allocate rc4 context structures */ text->rc4_enc_context= (rc4_context_t *) text->utils->malloc(sizeof(rc4_context_t)); if (text->rc4_enc_context==NULL) return SASL_NOMEM; text->rc4_dec_context= (rc4_context_t *) text->utils->malloc(sizeof(rc4_context_t)); if (text->rc4_dec_context==NULL) return SASL_NOMEM; /* initialize them */ rc4_init(text->rc4_enc_context,(const unsigned char *) enckey, 16); rc4_init(text->rc4_dec_context,(const unsigned char *) deckey, 16); return SASL_OK; } static int dec_rc4(void *v, const char *input, unsigned inputlen, unsigned char digest[16], char *output, unsigned *outputlen) { context_t *text = (context_t *) v; /* decrypt the text part */ rc4_decrypt(text->rc4_dec_context, input, output, inputlen-10); /* decrypt the HMAC part */ rc4_decrypt(text->rc4_dec_context, input+(inputlen-10), (char *) digest, 10); /* no padding so we just subtract the HMAC to get the text length */ *outputlen = inputlen - 10; return SASL_OK; } static int enc_rc4(void *v, const char *input, unsigned inputlen, unsigned char digest[16], char *output, unsigned *outputlen) { context_t *text = (context_t *) v; /* pad is zero */ *outputlen = inputlen+10; /* encrypt the text part */ rc4_encrypt(text->rc4_enc_context, (const char *) input, output, inputlen); /* encrypt the HMAC part */ rc4_encrypt(text->rc4_enc_context, (const char *) digest, (output)+inputlen, 10); return SASL_OK; } #endif /* WITH_RC4 */ struct digest_cipher available_ciphers[] = { #ifdef WITH_RC4 { "rc4-40", 40, 5, 0x01, &enc_rc4, &dec_rc4, &init_rc4, &free_rc4 }, { "rc4-56", 56, 7, 0x02, &enc_rc4, &dec_rc4, &init_rc4, &free_rc4 }, { "rc4", 128, 16, 0x04, &enc_rc4, &dec_rc4, &init_rc4, &free_rc4 }, #endif #ifdef WITH_DES { "des", 55, 16, 0x08, &enc_des, &dec_des, &init_des, NULL }, { "3des", 112, 16, 0x10, &enc_3des, &dec_3des, &init_3des, NULL }, #endif { NULL, 0, 0, 0, NULL, NULL, NULL, NULL } }; static int create_layer_keys(context_t *text, const sasl_utils_t *utils, HASH key, int keylen, char enckey[16], char deckey[16]) { MD5_CTX Md5Ctx; utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, key, keylen); if (text->i_am == SERVER) { utils->MD5Update(&Md5Ctx, (const unsigned char *) SEALING_SERVER_CLIENT, strlen(SEALING_SERVER_CLIENT)); } else { utils->MD5Update(&Md5Ctx, (const unsigned char *) SEALING_CLIENT_SERVER, strlen(SEALING_CLIENT_SERVER)); } utils->MD5Final((unsigned char *) enckey, &Md5Ctx); utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, key, keylen); if (text->i_am != SERVER) { utils->MD5Update(&Md5Ctx, (const unsigned char *)SEALING_SERVER_CLIENT, strlen(SEALING_SERVER_CLIENT)); } else { utils->MD5Update(&Md5Ctx, (const unsigned char *)SEALING_CLIENT_SERVER, strlen(SEALING_CLIENT_SERVER)); } utils->MD5Final((unsigned char *) deckey, &Md5Ctx); /* create integrity keys */ /* sending */ utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, text->HA1, HASHLEN); if (text->i_am == SERVER) { utils->MD5Update(&Md5Ctx, (const unsigned char *)SIGNING_SERVER_CLIENT, strlen(SIGNING_SERVER_CLIENT)); } else { utils->MD5Update(&Md5Ctx, (const unsigned char *)SIGNING_CLIENT_SERVER, strlen(SIGNING_CLIENT_SERVER)); } utils->MD5Final(text->Ki_send, &Md5Ctx); /* receiving */ utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, text->HA1, HASHLEN); if (text->i_am != SERVER) { utils->MD5Update(&Md5Ctx, (const unsigned char *)SIGNING_SERVER_CLIENT, strlen(SIGNING_SERVER_CLIENT)); } else { utils->MD5Update(&Md5Ctx, (const unsigned char *)SIGNING_CLIENT_SERVER, strlen(SIGNING_CLIENT_SERVER)); } utils->MD5Final(text->Ki_receive, &Md5Ctx); return SASL_OK; } static const unsigned short version = 1; /* len, CIPHER(Kc, {msg, pag, HMAC(ki, {SeqNum, msg})[0..9]}), x0001, SeqNum */ static int digestmd5_privacy_encode(void *context, const struct iovec *invec, unsigned numiov, const char **output, unsigned *outputlen) { context_t *text = (context_t *) context; int tmp; unsigned int tmpnum; unsigned short int tmpshort; int ret; char *out; unsigned char digest[16]; struct buffer_info *inblob, bufinfo; if(!context || !invec || !numiov || !output || !outputlen) { PARAMERROR(text->utils); return SASL_BADPARAM; } if (numiov > 1) { ret = _plug_iovec_to_buf(text->utils, invec, numiov, &text->enc_in_buf); if (ret != SASL_OK) return ret; inblob = text->enc_in_buf; } else { /* avoid the data copy */ bufinfo.data = invec[0].iov_base; bufinfo.curlen = invec[0].iov_len; inblob = &bufinfo; } /* make sure the output buffer is big enough for this blob */ ret = _plug_buf_alloc(text->utils, &(text->encode_buf), &(text->encode_buf_len), (4 + /* for length */ inblob->curlen + /* for content */ 10 + /* for MAC */ 8 + /* maximum pad */ 6 + /* for padding */ 1)); /* trailing null */ if(ret != SASL_OK) return ret; /* skip by the length for now */ out = (text->encode_buf)+4; /* construct (seqnum, msg) */ /* We can just use the output buffer because it's big enough */ tmpnum = htonl(text->seqnum); memcpy(text->encode_buf, &tmpnum, 4); memcpy(text->encode_buf + 4, inblob->data, inblob->curlen); /* HMAC(ki, (seqnum, msg) ) */ text->utils->hmac_md5((const unsigned char *) text->encode_buf, inblob->curlen + 4, text->Ki_send, HASHLEN, digest); /* calculate the encrpyted part */ text->cipher_enc(text, inblob->data, inblob->curlen, digest, out, outputlen); out+=(*outputlen); /* copy in version */ tmpshort = htons(version); memcpy(out, &tmpshort, 2); /* 2 bytes = version */ out+=2; (*outputlen)+=2; /* for version */ /* put in seqnum */ tmpnum = htonl(text->seqnum); memcpy(out, &tmpnum, 4); /* 4 bytes = seq # */ (*outputlen)+=4; /* for seqnum */ /* put the 1st 4 bytes in */ tmp=htonl(*outputlen); memcpy(text->encode_buf, &tmp, 4); (*outputlen)+=4; *output = text->encode_buf; text->seqnum++; return SASL_OK; } static int digestmd5_privacy_decode_once(void *context, const char **input, unsigned *inputlen, char **output, unsigned *outputlen) { context_t *text = (context_t *) context; int tocopy; unsigned diff; int result; unsigned char digest[16]; int tmpnum; int lup; if (text->needsize>0) /* 4 bytes for how long message is */ { /* if less than 4 bytes just copy those we have into text->size */ if (*inputlen<4) tocopy=*inputlen; else tocopy=4; if (tocopy>text->needsize) tocopy=text->needsize; memcpy(text->sizebuf+4-text->needsize, *input, tocopy); text->needsize-=tocopy; *input+=tocopy; *inputlen-=tocopy; if (text->needsize==0) /* got all of size */ { memcpy(&(text->size), text->sizebuf, 4); text->cursize=0; text->size=ntohl(text->size); if ((text->size>0xFFFF) || (text->size < 0)) { return SASL_FAIL; /* too big probably error */ } if(!text->buffer) text->buffer=text->utils->malloc(text->size+5); else text->buffer=text->utils->realloc(text->buffer,text->size+5); if (text->buffer == NULL) return SASL_NOMEM; } *outputlen=0; *output=NULL; if (*inputlen==0) /* have to wait until next time for data */ return SASL_OK; if (text->size==0) /* should never happen */ return SASL_FAIL; } diff=text->size - text->cursize; /* bytes need for full message */ if (! text->buffer) return SASL_FAIL; if (*inputlen < diff) /* not enough for a decode */ { memcpy(text->buffer+text->cursize, *input, *inputlen); text->cursize+=*inputlen; *inputlen=0; *outputlen=0; *output=NULL; return SASL_OK; } else { memcpy(text->buffer+text->cursize, *input, diff); *input+=diff; *inputlen-=diff; } { unsigned short ver; unsigned int seqnum; unsigned char checkdigest[16]; result = _plug_buf_alloc(text->utils, &text->decode_once_buf, &text->decode_once_buf_len, text->size-6); if (result != SASL_OK) return result; *output = text->decode_once_buf; *outputlen = *inputlen; result=text->cipher_dec(text,text->buffer,text->size-6,digest, *output, outputlen); if (result!=SASL_OK) return result; { int i; for(i=10; i; i--) { memcpy(&ver, text->buffer+text->size-i,2); ver=ntohs(ver); } } /* check the version number */ memcpy(&ver, text->buffer+text->size-6, 2); ver=ntohs(ver); if (ver != version) { text->utils->seterror(text->utils->conn, 0, "Wrong Version"); return SASL_FAIL; } /* check the CMAC */ /* construct (seqnum, msg) */ result = _plug_buf_alloc(text->utils, &text->decode_tmp_buf, &text->decode_tmp_buf_len, *outputlen + 4); if(result != SASL_OK) return result; tmpnum = htonl(text->rec_seqnum); memcpy(text->decode_tmp_buf, &tmpnum, 4); memcpy(text->decode_tmp_buf + 4, *output, *outputlen); /* HMAC(ki, (seqnum, msg) ) */ text->utils->hmac_md5((const unsigned char *) text->decode_tmp_buf, (*outputlen) + 4, text->Ki_receive, HASHLEN, checkdigest); /* now check it */ for (lup=0;lup<10;lup++) if (checkdigest[lup]!=digest[lup]) { text->utils->seterror(text->utils->conn, 0, "CMAC doesn't match at byte %d!", lup); return SASL_FAIL; } /* check the sequence number */ memcpy(&seqnum, text->buffer+text->size-4,4); seqnum=ntohl(seqnum); if (seqnum!=text->rec_seqnum) { text->utils->seterror(text->utils->conn, 0, "Incorrect Sequence Number"); return SASL_FAIL; } text->rec_seqnum++; /* now increment it */ } text->size=-1; text->needsize=4; return SASL_OK; } static int digestmd5_privacy_decode(void *context, const char *input, unsigned inputlen, const char **output, unsigned *outputlen) { context_t *text = (context_t *) context; int ret; ret = _plug_decode(text->utils, context, input, inputlen, &text->decode_buf, &text->decode_buf_len, outputlen, digestmd5_privacy_decode_once); *output = text->decode_buf; return ret; } static int digestmd5_integrity_encode(void *context, const struct iovec *invec, unsigned numiov, const char **output, unsigned *outputlen) { context_t *text = (context_t *) context; unsigned char MAC[16]; unsigned int tmpnum; unsigned short int tmpshort; struct buffer_info *inblob, bufinfo; int ret; if(!context || !invec || !numiov || !output || !outputlen) { PARAMERROR( text->utils ); return SASL_BADPARAM; } if (numiov > 1) { ret = _plug_iovec_to_buf(text->utils, invec, numiov, &text->enc_in_buf); if (ret != SASL_OK) return ret; inblob = text->enc_in_buf; } else { /* avoid the data copy */ bufinfo.data = invec[0].iov_base; bufinfo.curlen = invec[0].iov_len; inblob = &bufinfo; } /* construct output */ *outputlen = 4 + inblob->curlen + 16; ret = _plug_buf_alloc(text->utils, &(text->encode_buf), &(text->encode_buf_len), *outputlen); if(ret != SASL_OK) return ret; /* construct (seqnum, msg) */ /* we can just use the output buffer */ tmpnum = htonl(text->seqnum); memcpy(text->encode_buf, &tmpnum, 4); memcpy(text->encode_buf + 4, inblob->data, inblob->curlen); /* HMAC(ki, (seqnum, msg) ) */ text->utils->hmac_md5(text->encode_buf, inblob->curlen + 4, text->Ki_send, HASHLEN, MAC); /* create MAC */ tmpshort = htons(version); memcpy(MAC + 10, &tmpshort, MAC_OFFS); /* 2 bytes = version */ tmpnum = htonl(text->seqnum); memcpy(MAC + 12, &tmpnum, 4); /* 4 bytes = sequence number */ /* copy into output */ tmpnum = htonl((*outputlen) - 4); /* length of message in network byte order */ memcpy(text->encode_buf, &tmpnum, 4); /* the message text */ memcpy(text->encode_buf + 4, inblob->data, inblob->curlen); /* the MAC */ memcpy(text->encode_buf + 4 + inblob->curlen, MAC, 16); text->seqnum++; /* add one to sequence number */ *output = text->encode_buf; return SASL_OK; } static int create_MAC(context_t * text, char *input, int inputlen, int seqnum, unsigned char MAC[16]) { unsigned int tmpnum; unsigned short int tmpshort; int ret; if (inputlen < 0) return SASL_FAIL; ret = _plug_buf_alloc(text->utils, &(text->MAC_buf), &(text->MAC_buf_len), inputlen + 4); if(ret != SASL_OK) return ret; /* construct (seqnum, msg) */ tmpnum = htonl(seqnum); memcpy(text->MAC_buf, &tmpnum, 4); memcpy(text->MAC_buf + 4, input, inputlen); /* HMAC(ki, (seqnum, msg) ) */ text->utils->hmac_md5(text->MAC_buf, inputlen + 4, text->Ki_receive, HASHLEN, MAC); /* create MAC */ tmpshort = htons(version); memcpy(MAC + 10, &tmpshort, 2); /* 2 bytes = version */ tmpnum = htonl(seqnum); memcpy(MAC + 12, &tmpnum, 4); /* 4 bytes = sequence number */ return SASL_OK; } static int check_integrity(context_t * text, char *buf, int bufsize, char **output, unsigned *outputlen) { unsigned char MAC[16]; int result; result = create_MAC(text, buf, bufsize - 16, text->rec_seqnum, MAC); if (result != SASL_OK) return result; /* make sure the MAC is right */ if (strncmp((char *) MAC, buf + bufsize - 16, 16) != 0) { text->utils->seterror(text->utils->conn, 0, "MAC doesn't match"); return SASL_FAIL; } text->rec_seqnum++; /* ok make output message */ result = _plug_buf_alloc(text->utils, &text->decode_once_buf, &text->decode_once_buf_len, bufsize - 15); if (result != SASL_OK) return result; *output = text->decode_once_buf; memcpy(*output, buf, bufsize - 16); *outputlen = bufsize - 16; (*output)[*outputlen] = 0; return SASL_OK; } static int digestmd5_integrity_decode_once(void *context, const char **input, unsigned *inputlen, char **output, unsigned *outputlen) { context_t *text = (context_t *) context; int tocopy; unsigned diff; int result; if (text->needsize > 0) { /* 4 bytes for how long message is */ /* * if less than 4 bytes just copy those we have into text->size */ if (*inputlen < 4) tocopy = *inputlen; else tocopy = 4; if (tocopy > text->needsize) tocopy = text->needsize; memcpy(text->sizebuf + 4 - text->needsize, *input, tocopy); text->needsize -= tocopy; *input += tocopy; *inputlen -= tocopy; if (text->needsize == 0) { /* got all of size */ memcpy(&(text->size), text->sizebuf, 4); text->cursize = 0; text->size = ntohl(text->size); if ((text->size > 0xFFFF) || (text->size < 0)) return SASL_FAIL; /* too big probably error */ if(!text->buffer) text->buffer=text->utils->malloc(text->size+5); else text->buffer=text->utils->realloc(text->buffer,text->size+5); if (text->buffer == NULL) return SASL_NOMEM; } *outputlen = 0; *output = NULL; if (*inputlen == 0) /* have to wait until next time for data */ return SASL_OK; if (text->size == 0) /* should never happen */ return SASL_FAIL; } diff = text->size - text->cursize; /* bytes need for full message */ if(! text->buffer) return SASL_FAIL; if (*inputlen < diff) { /* not enough for a decode */ memcpy(text->buffer + text->cursize, *input, *inputlen); text->cursize += *inputlen; *inputlen = 0; *outputlen = 0; *output = NULL; return SASL_OK; } else { memcpy(text->buffer + text->cursize, *input, diff); *input += diff; *inputlen -= diff; } result = check_integrity(text, text->buffer, text->size, output, outputlen); if (result != SASL_OK) return result; text->size = -1; text->needsize = 4; return SASL_OK; } static int digestmd5_integrity_decode(void *context, const char *input, unsigned inputlen, const char **output, unsigned *outputlen) { context_t *text = (context_t *) context; int ret; ret = _plug_decode(text->utils, context, input, inputlen, &text->decode_buf, &text->decode_buf_len, outputlen, digestmd5_integrity_decode_once); *output = text->decode_buf; return ret; } static void digestmd5_common_mech_dispose(void *conn_context, const sasl_utils_t *utils) { context_t *text = (context_t *) conn_context; if (!text || !utils) return; if (text->cipher_free) text->cipher_free(text); /* free the stuff in the context */ if (text->response_value) utils->free(text->response_value); if (text->buffer) utils->free(text->buffer); if (text->encode_buf) utils->free(text->encode_buf); if (text->decode_buf) utils->free(text->decode_buf); if (text->decode_once_buf) utils->free(text->decode_once_buf); if (text->decode_tmp_buf) utils->free(text->decode_tmp_buf); if (text->out_buf) utils->free(text->out_buf); if (text->MAC_buf) utils->free(text->MAC_buf); if (text->enc_in_buf) { if (text->enc_in_buf->data) utils->free(text->enc_in_buf->data); utils->free(text->enc_in_buf); } utils->free(conn_context); } static void clear_global_context(global_context_t *glob_context, const sasl_utils_t *utils) { if (glob_context->authid) utils->free(glob_context->authid); if (glob_context->realm) utils->free(glob_context->realm); if (glob_context->nonce) utils->free(glob_context->nonce); /* Apple: the client nonce is owned by the client context because we've unimplemented reauth */ /* and the global context is thread-dangerous */ /* nothing to free, just set to NULL */ //if (glob_context->cnonce) utils->free(glob_context->cnonce); if (glob_context->serverFQDN) utils->free(glob_context->serverFQDN); memset(glob_context, 0, sizeof(global_context_t)); } static void digestmd5_common_mech_free(void *glob_context, const sasl_utils_t *utils) { global_context_t *glob_text = (global_context_t *) glob_context; clear_global_context(glob_text, utils); utils->free(glob_text); } /***************************** Server Section *****************************/ typedef struct server_context { context_t common; char *authid; char *realm; unsigned char *nonce; unsigned int nonce_count; unsigned char *cnonce; time_t timestamp; int stale; /* last nonce is stale */ sasl_ssf_t limitssf, requiressf; /* application defined bounds */ } server_context_t; static void DigestCalcHA1FromSecret(context_t * text, const sasl_utils_t * utils, HASH HA1, unsigned char *authorization_id, unsigned char *pszNonce, unsigned char *pszCNonce, HASHHEX SessionKey) { MD5_CTX Md5Ctx; /* calculate session key */ utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, HA1, HASHLEN); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszNonce, strlen((char *) pszNonce)); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszCNonce, strlen((char *) pszCNonce)); if (authorization_id != NULL) { utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, authorization_id, strlen((char *) authorization_id)); } utils->MD5Final(HA1, &Md5Ctx); CvtHex(HA1, SessionKey); /* save HA1 because we need it to make the privacy and integrity keys */ memcpy(text->HA1, HA1, sizeof(HASH)); } static char *create_response(context_t * text, const sasl_utils_t * utils, unsigned char *nonce, unsigned int ncvalue, unsigned char *cnonce, char *qop, char *digesturi, HASH Secret, char *authorization_id, char **response_value) { HASHHEX SessionKey; HASHHEX HEntity = "00000000000000000000000000000000"; HASHHEX Response; char *result; if (qop == NULL) qop = "auth"; DigestCalcHA1FromSecret(text, utils, Secret, (unsigned char *) authorization_id, nonce, cnonce, SessionKey); DigestCalcResponse(utils, SessionKey,/* H(A1) */ nonce, /* nonce from server */ ncvalue, /* 8 hex digits */ cnonce, /* client nonce */ (unsigned char *) qop, /* qop-value: "", "auth", * "auth-int" */ (unsigned char *) digesturi, /* requested URL */ (unsigned char *) "AUTHENTICATE", HEntity, /* H(entity body) if qop="auth-int" */ Response /* request-digest or response-digest */ ); result = utils->malloc(HASHHEXLEN + 1); memcpy(result, Response, HASHHEXLEN); result[HASHHEXLEN] = 0; /* response_value (used for reauth i think */ if (response_value != NULL) { DigestCalcResponse(utils, SessionKey, /* H(A1) */ nonce, /* nonce from server */ ncvalue, /* 8 hex digits */ cnonce, /* client nonce */ (unsigned char *) qop, /* qop-value: "", "auth", * "auth-int" */ (unsigned char *) digesturi, /* requested URL */ NULL, HEntity, /* H(entity body) if qop="auth-int" */ Response /* request-digest or response-digest */ ); *response_value = utils->malloc(HASHHEXLEN + 1); if (*response_value == NULL) return NULL; memcpy(*response_value, Response, HASHHEXLEN); (*response_value)[HASHHEXLEN] = 0; } return result; } static int get_server_realm(sasl_server_params_t * params, char **realm) { /* look at user realm first */ if (params->user_realm != NULL) { if(params->user_realm[0] != '\0') { *realm = (char *) params->user_realm; } else { /* Catch improperly converted apps */ params->utils->seterror(params->utils->conn, 0, "user_realm is an empty string!"); return SASL_BADPARAM; } } else if (params->serverFQDN != NULL) { *realm = (char *) params->serverFQDN; } else { params->utils->seterror(params->utils->conn, 0, "no way to obtain domain"); return SASL_FAIL; } return SASL_OK; } /* * Convert hex string to int */ static int htoi(unsigned char *hexin, unsigned int *res) { int lup, inlen; inlen = strlen((char *) hexin); *res = 0; for (lup = 0; lup < inlen; lup++) { switch (hexin[lup]) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': *res = (*res << 4) + (hexin[lup] - '0'); break; case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': *res = (*res << 4) + (hexin[lup] - 'a' + 10); break; case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': *res = (*res << 4) + (hexin[lup] - 'A' + 10); break; default: return SASL_BADPARAM; } } return SASL_OK; } static int digestmd5_server_mech_new(void *glob_context __attribute__((unused)), sasl_server_params_t * sparams, const char *challenge __attribute__((unused)), unsigned challen __attribute__((unused)), void **conn_context) { context_t *text; /* holds state are in -- allocate server size */ text = sparams->utils->malloc(sizeof(server_context_t)); if (text == NULL) return SASL_NOMEM; memset(text, 0, sizeof(server_context_t)); text->state = 1; text->i_am = SERVER; *conn_context = text; return SASL_OK; } static int digestmd5_server_mech_step1(server_context_t *stext, sasl_server_params_t *sparams, const char *clientin __attribute__((unused)), unsigned clientinlen __attribute__((unused)), const char **serverout, unsigned *serveroutlen, sasl_out_params_t * oparams __attribute__((unused))) { context_t *text = (context_t *) stext; int result; char *realm; unsigned char *nonce; char *charset = "utf-8"; char qop[1024], cipheropts[1024]; struct digest_cipher *cipher; unsigned resplen; int added_conf = 0; sparams->utils->log(sparams->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 server step 1"); /* get realm */ result = get_server_realm(sparams, &realm); if(result != SASL_OK) return result; /* what options should we offer the client? */ qop[0] = '\0'; cipheropts[0] = '\0'; if (stext->requiressf == 0) { if (*qop) strcat(qop, ","); strcat(qop, "auth"); } if (stext->requiressf <= 1 && stext->limitssf >= 1) { if (*qop) strcat(qop, ","); strcat(qop, "auth-int"); } cipher = available_ciphers; while (cipher->name) { /* do we allow this particular cipher? */ if (stext->requiressf <= cipher->ssf && stext->limitssf >= cipher->ssf) { if (!added_conf) { if (*qop) strcat(qop, ","); strcat(qop, "auth-conf"); added_conf = 1; } if (*cipheropts) strcat(cipheropts, ","); strcat(cipheropts, cipher->name); } cipher++; } if (*qop == '\0') { /* we didn't allow anything?!? we'll return SASL_TOOWEAK, since that's close enough */ return SASL_TOOWEAK; } /* * digest-challenge = 1#( realm | nonce | qop-options | stale | maxbuf | * charset | cipher-opts | auth-param ) */ /* FIXME: get nonce XXX have to clean up after self if fail */ nonce = create_nonce(sparams->utils); if (nonce == NULL) { SETERROR(sparams->utils, "internal erorr: failed creating a nonce"); return SASL_FAIL; } resplen = strlen(nonce) + strlen("nonce") + 5; result = _plug_buf_alloc(sparams->utils, &(text->out_buf), &(text->out_buf_len), resplen); if(result != SASL_OK) return result; sprintf(text->out_buf, "nonce=\"%s\"", nonce); /* add to challenge; if we chose not to specify a realm, we won't * send one to the client */ if (realm && add_to_challenge(sparams->utils, &text->out_buf, &text->out_buf_len, &resplen, "realm", (unsigned char *) realm, TRUE) != SASL_OK) { SETERROR(sparams->utils, "internal error: add_to_challenge failed"); return SASL_FAIL; } /* * qop-options A quoted string of one or more tokens indicating the * "quality of protection" values supported by the server. The value * "auth" indicates authentication; the value "auth-int" indicates * authentication with integrity protection; the value "auth-conf" * indicates authentication with integrity protection and encryption. */ /* add qop to challenge */ if (add_to_challenge(sparams->utils, &text->out_buf, &text->out_buf_len, &resplen, "qop", (unsigned char *) qop, TRUE) != SASL_OK) { SETERROR(sparams->utils, "internal error: add_to_challenge 3 failed"); return SASL_FAIL; } /* * Cipheropts - list of ciphers server supports */ /* add cipher-opts to challenge; only add if there are some */ if (strcmp(cipheropts,"")!=0) { if (add_to_challenge(sparams->utils, &text->out_buf, &text->out_buf_len, &resplen, "cipher", (unsigned char *) cipheropts, TRUE) != SASL_OK) { SETERROR(sparams->utils, "internal error: add_to_challenge 4 failed"); return SASL_FAIL; } } /* "stale" is true if a reauth failed because of a nonce timeout */ if (stext->stale && add_to_challenge(sparams->utils, &text->out_buf, &text->out_buf_len, &resplen, "stale", "true", FALSE) != SASL_OK) { SETERROR(sparams->utils, "internal error: add_to_challenge failed"); return SASL_FAIL; } /* * maxbuf A number indicating the size of the largest buffer the server * is able to receive when using "auth-int". If this directive is * missing, the default value is 65536. This directive may appear at most * once; if multiple instances are present, the client should abort the * authentication exchange. */ if (add_to_challenge(sparams->utils, &text->out_buf, &text->out_buf_len, &resplen, "charset", (unsigned char *) charset, FALSE) != SASL_OK) { SETERROR(sparams->utils, "internal error: add_to_challenge 5 failed"); return SASL_FAIL; } /* * algorithm * This directive is required for backwards compatibility with HTTP * Digest., which supports other algorithms. . This directive is * required and MUST appear exactly once; if not present, or if multiple * instances are present, the client should abort the authentication * exchange. * * algorithm = "algorithm" "=" "md5-sess" */ if (add_to_challenge(sparams->utils, &text->out_buf, &text->out_buf_len, &resplen, "algorithm", (unsigned char *) "md5-sess", FALSE)!=SASL_OK) { SETERROR(sparams->utils, "internal error: add_to_challenge 6 failed"); return SASL_FAIL; } /* * The size of a digest-challenge MUST be less than 2048 bytes!!! */ if (*serveroutlen > 2048) { SETERROR(sparams->utils, "internal error: challenge larger than 2048 bytes"); return SASL_FAIL; } stext->authid = NULL; _plug_strdup(sparams->utils, realm, &stext->realm, NULL); stext->nonce = nonce; stext->nonce_count = 1; stext->cnonce = NULL; stext->timestamp = time(0); *serveroutlen = strlen(text->out_buf); *serverout = text->out_buf; text->state = 2; return SASL_CONTINUE; } static int digestmd5_server_mech_step2(server_context_t *stext, sasl_server_params_t *sparams, const char *clientin, unsigned clientinlen, const char **serverout, unsigned *serveroutlen, sasl_out_params_t * oparams) { context_t *text = (context_t *) stext; /* verify digest */ sasl_secret_t *sec = NULL; int result; char *serverresponse = NULL; char *username = NULL; char *authorization_id = NULL; char *realm = NULL; unsigned char *cnonce = NULL; unsigned int noncecount = 0; char *qop = NULL; char *digesturi = NULL; char *response = NULL; /* setting the default value (65536) */ unsigned int client_maxbuf = 65536; int maxbuf_count = 0; /* How many maxbuf instaces was found */ char *charset = NULL; char *cipher = NULL; unsigned int n=0; HASH A1; /* password prop_request */ const char *password_request[] = { SASL_AUX_PASSWORD, "*cmusaslsecretDIGEST-MD5", NULL }; unsigned len; struct propval auxprop_values[2]; /* can we mess with clientin? copy it to be safe */ char *in_start = NULL; char *in = NULL; sparams->utils->log(sparams->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 server step 2"); in = sparams->utils->malloc(clientinlen + 1); memcpy(in, clientin, clientinlen); in[clientinlen] = 0; in_start = in; /* parse what we got */ while (in[0] != '\0') { char *name = NULL, *value = NULL; get_pair(&in, &name, &value); if (name == NULL) break; /* Extracting parameters */ /* * digest-response = 1#( username | realm | nonce | cnonce | * nonce-count | qop | digest-uri | response | maxbuf | charset | * cipher | auth-param ) */ if (strcasecmp(name, "username") == 0) { if (stext->authid && (strcmp(value, stext->authid) != 0)) { SETERROR(sparams->utils, "username changed: authentication aborted"); result = SASL_FAIL; goto FreeAllMem; } _plug_strdup(sparams->utils, value, &username, NULL); } else if (strcasecmp(name, "authzid") == 0) { _plug_strdup(sparams->utils, value, &authorization_id, NULL); } else if (strcasecmp(name, "cnonce") == 0) { if (stext->cnonce && (strcmp(value, stext->cnonce) != 0)) { SETERROR(sparams->utils, "cnonce changed: authentication aborted"); result = SASL_FAIL; goto FreeAllMem; } _plug_strdup(sparams->utils, value, (char **) &cnonce, NULL); } else if (strcasecmp(name, "nc") == 0) { if (htoi((unsigned char *) value, &noncecount) != SASL_OK) { SETERROR(sparams->utils, "error converting hex to int"); result = SASL_BADAUTH; goto FreeAllMem; } else if (noncecount != stext->nonce_count) { SETERROR(sparams->utils, "incorrect nonce-count: authentication aborted"); result = SASL_BADAUTH; goto FreeAllMem; } } else if (strcasecmp(name, "realm") == 0) { if (realm) { SETERROR(sparams->utils, "duplicate realm: authentication aborted"); result = SASL_FAIL; goto FreeAllMem; } else if (stext->realm && (strcmp(value, stext->realm) != 0)) { SETERROR(sparams->utils, "realm changed: authentication aborted"); result = SASL_FAIL; goto FreeAllMem; } _plug_strdup(sparams->utils, value, &realm, NULL); } else if (strcasecmp(name, "nonce") == 0) { if (strcmp(value, (char *) stext->nonce) != 0) { /* * Nonce changed: Abort authentication!!! */ SETERROR(sparams->utils, "nonce changed: authentication aborted"); result = SASL_BADAUTH; goto FreeAllMem; } } else if (strcasecmp(name, "qop") == 0) { _plug_strdup(sparams->utils, value, &qop, NULL); } else if (strcasecmp(name, "digest-uri") == 0) { /* XXX: verify digest-uri format */ /* * digest-uri-value = serv-type "/" host [ "/" serv-name ] */ _plug_strdup(sparams->utils, value, &digesturi, NULL); } else if (strcasecmp(name, "response") == 0) { _plug_strdup(sparams->utils, value, &response, NULL); } else if (strcasecmp(name, "cipher") == 0) { _plug_strdup(sparams->utils, value, &cipher, NULL); } else if (strcasecmp(name, "maxbuf") == 0) { maxbuf_count++; if (maxbuf_count != 1) { result = SASL_BADAUTH; SETERROR(sparams->utils, "duplicate maxbuf: authentication aborted"); goto FreeAllMem; } else if (sscanf(value, "%u", &client_maxbuf) != 1) { result = SASL_BADAUTH; SETERROR(sparams->utils, "invalid maxbuf parameter"); goto FreeAllMem; } else { if (client_maxbuf <= 16) { result = SASL_BADAUTH; SETERROR(sparams->utils, "maxbuf parameter too small"); goto FreeAllMem; } } } else if (strcasecmp(name, "charset") == 0) { if (strcasecmp(value, "utf-8") != 0) { SETERROR(sparams->utils, "client doesn't support UTF-8"); result = SASL_FAIL; goto FreeAllMem; } _plug_strdup(sparams->utils, value, &charset, NULL); } else { sparams->utils->log(sparams->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 unrecognized pair %s/%s: ignoring", name, value); } } /* defaulting qop to "auth" if not specified */ if (qop == NULL) { _plug_strdup(sparams->utils, "auth", &qop, NULL); } /* check which layer/cipher to use */ if ((!strcasecmp(qop, "auth-conf")) && (cipher != NULL)) { /* see what cipher was requested */ struct digest_cipher *cptr; cptr = available_ciphers; while (cptr->name) { /* find the cipher requested & make sure it's one we're happy with by policy */ if (!strcasecmp(cipher, cptr->name) && stext->requiressf <= cptr->ssf && stext->limitssf >= cptr->ssf) { /* found it! */ break; } cptr++; } if (cptr->name) { text->cipher_enc = cptr->cipher_enc; text->cipher_dec = cptr->cipher_dec; text->cipher_init = cptr->cipher_init; text->cipher_free = cptr->cipher_free; oparams->mech_ssf = cptr->ssf; n = cptr->n; } else { /* erg? client requested something we didn't advertise! */ sparams->utils->log(sparams->utils->conn, SASL_LOG_WARN, "protocol violation: client requested invalid cipher"); SETERROR(sparams->utils, "client requested invalid cipher"); /* Mark that we attempted security layer negotiation */ oparams->mech_ssf = 2; result = SASL_FAIL; goto FreeAllMem; } oparams->encode=&digestmd5_privacy_encode; oparams->decode=&digestmd5_privacy_decode; } else if (!strcasecmp(qop, "auth-int") && stext->requiressf <= 1 && stext->limitssf >= 1) { oparams->encode = &digestmd5_integrity_encode; oparams->decode = &digestmd5_integrity_decode; oparams->mech_ssf = 1; } else if (!strcasecmp(qop, "auth") && stext->requiressf == 0) { oparams->encode = NULL; oparams->decode = NULL; oparams->mech_ssf = 0; } else { SETERROR(sparams->utils, "protocol violation: client requested invalid qop"); result = SASL_FAIL; goto FreeAllMem; } /* * username = "username" "=" <"> username-value <"> * username-value = qdstr-val cnonce = "cnonce" "=" <"> * cnonce-value <"> cnonce-value = qdstr-val nonce-count = "nc" * "=" nc-value nc-value = 8LHEX qop = "qop" "=" * qop-value digest-uri = "digest-uri" "=" digest-uri-value * digest-uri-value = serv-type "/" host [ "/" serv-name ] serv-type * = 1*ALPHA host = 1*( ALPHA | DIGIT | "-" | "." ) service * = host response = "response" "=" <"> response-value <"> * response-value = 32LHEX LHEX = "0" | "1" | "2" | "3" | "4" | "5" | * "6" | "7" | "8" | "9" | "a" | "b" | "c" | "d" | "e" | "f" cipher = * "cipher" "=" cipher-value */ /* Verifing that all parameters was defined */ if ((username == NULL) || (noncecount == 0) || (cnonce == NULL) || (digesturi == NULL) || (response == NULL)) { SETERROR(sparams->utils, "required parameters missing"); result = SASL_BADAUTH; goto FreeAllMem; } result = sparams->utils->prop_request(sparams->propctx, password_request); if(result != SASL_OK) { SETERROR(sparams->utils, "unable to resquest user password"); goto FreeAllMem; } /* this will trigger the getting of the aux properties */ /* Note that if we don't have an authorization id, we don't use it... */ result = sparams->canon_user(sparams->utils->conn, username, 0, SASL_CU_AUTHID, oparams); if (result != SASL_OK) { SETERROR(sparams->utils, "unable cannonify user and get auxprops"); goto FreeAllMem; } if(!authorization_id || !*authorization_id) { result = sparams->canon_user(sparams->utils->conn, username, 0, SASL_CU_AUTHZID, oparams); } else { result = sparams->canon_user(sparams->utils->conn, authorization_id, 0, SASL_CU_AUTHZID, oparams); } if (result != SASL_OK) { SETERROR(sparams->utils, "unable authorization ID"); goto FreeAllMem; } result = sparams->utils->prop_getnames(sparams->propctx, password_request, auxprop_values); if(result < 0 || ((!auxprop_values[0].name || !auxprop_values[0].values) && (!auxprop_values[1].name || !auxprop_values[1].values))) { /* We didn't find this username */ sparams->utils->seterror(sparams->utils->conn, 0, "no secret in database"); result = SASL_NOUSER; goto FreeAllMem; } if(auxprop_values[0].name && auxprop_values[0].values) { len = strlen(auxprop_values[0].values[0]); if (len == 0) { sparams->utils->seterror(sparams->utils->conn,0, "empty secret"); result = SASL_FAIL; goto FreeAllMem; } sec = sparams->utils->malloc(sizeof(sasl_secret_t) + len); if (!sec) { SETERROR(sparams->utils, "unable to allocate secret"); result = SASL_FAIL; goto FreeAllMem; } sec->len = len; strncpy(sec->data, auxprop_values[0].values[0], len + 1); /* * Verifying response obtained from client * * H_URP = H({ username-value,":",realm-value,":",passwd}) sec->data * contains H_URP */ /* Calculate the secret from the plaintext password */ { HASH HA1; DigestCalcSecret(sparams->utils, username, stext->realm, sec->data, sec->len, HA1); /* * A1 = { H( { username-value, ":", realm-value, ":", passwd } ), * ":", nonce-value, ":", cnonce-value } */ memcpy(A1, HA1, HASHLEN); A1[HASHLEN] = '\0'; } /* We're done with sec now. Let's get rid of it */ _plug_free_secret(sparams->utils, &sec); } else if (auxprop_values[1].name && auxprop_values[1].values) { memcpy(A1, auxprop_values[1].values[0], HASHLEN); A1[HASHLEN] = '\0'; } else { sparams->utils->seterror(sparams->utils->conn, 0, "Have neither type of secret"); return SASL_FAIL; } serverresponse = create_response(text, sparams->utils, stext->nonce, stext->nonce_count, cnonce, qop, digesturi, A1, authorization_id, &text->response_value); if (serverresponse == NULL) { SETERROR(sparams->utils, "internal error: unable to create response"); result = SASL_NOMEM; goto FreeAllMem; } /* if ok verified */ if (strcmp(serverresponse, response) != 0) { SETERROR(sparams->utils, "client response doesn't match what we generated"); result = SASL_BADAUTH; goto FreeAllMem; } /* see if our nonce expired (stext->stale = 1) */ /* * nothing more to do; authenticated set oparams information */ oparams->doneflag = 1; oparams->maxoutbuf = client_maxbuf - 4; if(oparams->mech_ssf > 1) { /* MAC block (privacy) */ oparams->maxoutbuf -= 25; } else if(oparams->mech_ssf == 1) { /* MAC block (integrity) */ oparams->maxoutbuf -= 16; } oparams->param_version = 0; text->seqnum = 0; /* for integrity/privacy */ text->rec_seqnum = 0; /* for integrity/privacy */ text->maxbuf = client_maxbuf; text->utils = sparams->utils; /* used by layers */ text->size = -1; text->needsize = 4; text->buffer = NULL; if (oparams->mech_ssf > 0) { char enckey[16]; char deckey[16]; create_layer_keys(text, sparams->utils,text->HA1,n,enckey,deckey); /* initialize cipher if need be */ if (text->cipher_init) if (text->cipher_init(text, enckey, deckey) != SASL_OK) { sparams->utils->seterror(sparams->utils->conn, 0, "couldn't init cipher"); } } /* * The server receives and validates the "digest-response". The server * checks that the nonce-count is "00000001". If it supports subsequent * authentication, it saves the value of the nonce and the nonce-count. */ /* * The "username-value", "realm-value" and "passwd" are encoded according * to the value of the "charset" directive. If "charset=UTF-8" is * present, and all the characters of either "username-value" or "passwd" * are in the ISO 8859-1 character set, then it must be converted to * UTF-8 before being hashed. A sample implementation of this conversion * is in section 8. */ /* add to challenge */ { unsigned resplen = strlen(text->response_value) + strlen("rspauth") + 3; result = _plug_buf_alloc(sparams->utils, &(text->out_buf), &(text->out_buf_len), resplen); if(result != SASL_OK) { goto FreeAllMem; } sprintf(text->out_buf, "rspauth=%s", text->response_value); /* self check */ if (strlen(text->out_buf) > 2048) { result = SASL_FAIL; goto FreeAllMem; } /* setup for a potential reauth */ *serveroutlen = strlen(text->out_buf); *serverout = text->out_buf; result = SASL_OK; } FreeAllMem: /* free everything */ /* * sparams->utils->free (authorization_id); */ if (in_start) sparams->utils->free (in_start); if (username != NULL) sparams->utils->free (username); if (realm != NULL) sparams->utils->free (realm); if (cnonce != NULL) sparams->utils->free (cnonce); if (response != NULL) sparams->utils->free (response); if (cipher != NULL) sparams->utils->free (cipher); if (serverresponse != NULL) sparams->utils->free(serverresponse); if (charset != NULL) sparams->utils->free (charset); if (digesturi != NULL) sparams->utils->free (digesturi); if (qop!=NULL) sparams->utils->free (qop); if (sec) _plug_free_secret(sparams->utils, &sec); return result; } static int digestmd5_server_mech_step(void *conn_context, sasl_server_params_t *sparams, const char *clientin, unsigned clientinlen, const char **serverout, unsigned *serveroutlen, sasl_out_params_t *oparams) { context_t *text = (context_t *) conn_context; server_context_t *stext = (server_context_t *) conn_context; if (clientinlen > 4096) return SASL_BADPROT; *serverout = NULL; *serveroutlen = 0; switch (text->state) { case 1: /* setup SSF limits */ if (sparams->props.max_ssf < sparams->external_ssf) { stext->limitssf = 0; } else { stext->limitssf = sparams->props.max_ssf - sparams->external_ssf; } if (sparams->props.min_ssf < sparams->external_ssf) { stext->requiressf = 0; } else { stext->requiressf = sparams->props.min_ssf - sparams->external_ssf; } #if 0 /* should we attempt reauth? */ if (clientin /* && we have reauth info */) { /* setup for reauth attempt */ if (digestmd5_server_mech_step2(stext, sparams, clientin, clientinlen, serverout, serveroutlen, oparams) == SASL_OK) return SASL_OK; else { sparams->utils->log(NULL, SASL_LOG_WARN, "DIGEST-MD5 reauth failed\n"); } } #endif /* re-initialize everything for a fresh start */ *serverout = NULL; *serveroutlen = 0; memset(oparams, 0, sizeof(sasl_out_params_t)); return digestmd5_server_mech_step1(stext, sparams, clientin, clientinlen, serverout, serveroutlen, oparams); case 2: return digestmd5_server_mech_step2(stext, sparams, clientin, clientinlen, serverout, serveroutlen, oparams); default: sparams->utils->log(NULL, SASL_LOG_ERR, "Invalid DIGEST-MD5 server step %d\n", text->state); return SASL_FAIL; } return SASL_FAIL; /* should never get here */ } static void digestmd5_server_mech_dispose(void *conn_context, const sasl_utils_t *utils) { server_context_t *stext = (server_context_t *) conn_context; if (!stext || !utils) return; if (stext->authid) utils->free(stext->authid); if (stext->realm) utils->free(stext->realm); if (stext->nonce) utils->free(stext->nonce); if (stext->cnonce) utils->free(stext->cnonce); digestmd5_common_mech_dispose(conn_context, utils); } static sasl_server_plug_t digestmd5_server_plugins[] = { { "DIGEST-MD5", /* mech_name */ #ifdef WITH_RC4 128, /* max_ssf */ #elif WITH_DES 112, #else 0, #endif SASL_SEC_NOPLAINTEXT | SASL_SEC_NOANONYMOUS | SASL_SEC_MUTUAL_AUTH, /* security_flags */ 0, //SASL_FEAT_ALLOWS_PROXY, /* features */ NULL, /* glob_context */ &digestmd5_server_mech_new, /* mech_new */ &digestmd5_server_mech_step, /* mech_step */ &digestmd5_server_mech_dispose, /* mech_dispose */ NULL, /* mech_free */ NULL, /* setpass */ NULL, /* user_query */ NULL, /* idle */ NULL, /* mech avail */ NULL /* spare */ } }; int digestmd5_server_plug_init(sasl_utils_t *utils __attribute__((unused)), int maxversion, int *out_version, sasl_server_plug_t **pluglist, int *plugcount) { if (maxversion < SASL_SERVER_PLUG_VERSION) return SASL_BADVERS; *out_version = SASL_SERVER_PLUG_VERSION; *pluglist = digestmd5_server_plugins; *plugcount = 1; return SASL_OK; } /***************************** Client Section *****************************/ typedef struct client_context { context_t common; char *realm; /* realm we are in (client) */ sasl_secret_t *password; /* user password (client) */ unsigned int free_password; /* set if we need to free password (client) */ unsigned char *lcnonce; /* Apple: putting the nonce in the global context doesn't work for multi-threaded */ /* clients. Let's store it here. */ } client_context_t; /* calculate H(A1) as per spec */ static void DigestCalcHA1(context_t * text, const sasl_utils_t * utils, unsigned char *pszUserName, unsigned char *pszRealm, sasl_secret_t * pszPassword, unsigned char *pszAuthorization_id, unsigned char *pszNonce, unsigned char *pszCNonce, HASHHEX SessionKey) { MD5_CTX Md5Ctx; HASH HA1; DigestCalcSecret(utils, pszUserName, pszRealm, (unsigned char *) pszPassword->data, pszPassword->len, HA1); /* calculate the session key */ utils->MD5Init(&Md5Ctx); utils->MD5Update(&Md5Ctx, HA1, HASHLEN); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszNonce, strlen((char *) pszNonce)); utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszCNonce, strlen((char *) pszCNonce)); if (pszAuthorization_id != NULL) { utils->MD5Update(&Md5Ctx, COLON, 1); utils->MD5Update(&Md5Ctx, pszAuthorization_id, strlen((char *) pszAuthorization_id)); } utils->MD5Final(HA1, &Md5Ctx); CvtHex(HA1, SessionKey); /* xxx rc-* use different n */ /* save HA1 because we'll need it for the privacy and integrity keys */ memcpy(text->HA1, HA1, sizeof(HASH)); } static char *calculate_response(context_t * text, const sasl_utils_t * utils, unsigned char *username, unsigned char *realm, unsigned char *nonce, unsigned int ncvalue, unsigned char *cnonce, char *qop, unsigned char *digesturi, sasl_secret_t * passwd, unsigned char *authorization_id, char **response_value) { HASHHEX SessionKey; HASHHEX HEntity = "00000000000000000000000000000000"; HASHHEX Response; char *result; /* Verifing that all parameters was defined */ if(!username || !cnonce || !nonce || !ncvalue || !digesturi || !passwd) { PARAMERROR( utils ); return NULL; } if (realm == NULL) { /* a NULL realm is equivalent to the empty string */ realm = (unsigned char *) ""; } if (qop == NULL) { /* default to a qop of just authentication */ qop = "auth"; } DigestCalcHA1(text, utils, username, realm, passwd, authorization_id, nonce, cnonce, SessionKey); DigestCalcResponse(utils, SessionKey,/* H(A1) */ nonce, /* nonce from server */ ncvalue, /* 8 hex digits */ cnonce, /* client nonce */ (unsigned char *) qop, /* qop-value: "", "auth", * "auth-int" */ digesturi, /* requested URL */ (unsigned char *) "AUTHENTICATE", HEntity, /* H(entity body) if qop="auth-int" */ Response /* request-digest or response-digest */ ); result = utils->malloc(HASHHEXLEN + 1); memcpy(result, Response, HASHHEXLEN); result[HASHHEXLEN] = 0; if (response_value != NULL) { DigestCalcResponse(utils, SessionKey, /* H(A1) */ nonce, /* nonce from server */ ncvalue, /* 8 hex digits */ cnonce, /* client nonce */ (unsigned char *) qop, /* qop-value: "", "auth", * "auth-int" */ (unsigned char *) digesturi, /* requested URL */ NULL, HEntity, /* H(entity body) if qop="auth-int" */ Response /* request-digest or response-digest */ ); *response_value = utils->malloc(HASHHEXLEN + 1); if (*response_value == NULL) return NULL; memcpy(*response_value, Response, HASHHEXLEN); (*response_value)[HASHHEXLEN] = 0; } return result; } static int make_client_response(context_t *text, sasl_client_params_t *params, sasl_out_params_t *oparams, unsigned int n) { client_context_t *ctext = (client_context_t *) text; unsigned char *digesturi = NULL; bool IsUTF8 = FALSE; char ncvalue[10]; char *response = NULL; unsigned resplen = 0; int result; digesturi = params->utils->malloc(strlen(params->service) + 1 + strlen(params->serverFQDN) + 1 + 1); if (digesturi == NULL) { result = SASL_NOMEM; goto FreeAllocatedMem; }; /* allocated exactly this. safe */ strcpy((char *) digesturi, params->service); strcat((char *) digesturi, "/"); strcat((char *) digesturi, params->serverFQDN); /* * strcat (digesturi, "/"); strcat (digesturi, params->serverFQDN); */ /* response */ response = calculate_response(text, params->utils, (char *) oparams->authid, (unsigned char *) ctext->realm, text->global->nonce, text->global->nonce_count, ctext->lcnonce ? ctext->lcnonce : text->global->cnonce, text->global->qop, digesturi, ctext->password, strcmp(oparams->user, oparams->authid) ? (char *) oparams->user : NULL, &text->response_value); /* Apple: do not keep calling realloc. Let us try to get close to the right size. */ //resplen = strlen(oparams->authid) + strlen("username") + 5; resplen = strlen(oparams->authid) + strlen("username=''authzid=''nonce=''cnonce=''nc=''qop=''cipher=''charset=''digest-uri=''response=''")*2 + 5; result =_plug_buf_alloc(params->utils, &(text->out_buf), &(text->out_buf_len), resplen); if (result != SASL_OK) goto FreeAllocatedMem; sprintf(text->out_buf, "username=\"%s\"", oparams->authid); if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "realm", (unsigned char *) ctext->realm, TRUE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } if (strcmp(oparams->user, oparams->authid)) { if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "authzid", (char *) oparams->user, TRUE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } } if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "nonce", text->global->nonce, TRUE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "cnonce", ctext->lcnonce ? ctext->lcnonce : text->global->cnonce, TRUE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } sprintf(ncvalue, "%08x", text->global->nonce_count); if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "nc", (unsigned char *) ncvalue, FALSE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "qop", (unsigned char *) text->global->qop, FALSE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } if (text->global->bestcipher != NULL) if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "cipher", (unsigned char *) text->global->bestcipher->name, TRUE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } if (IsUTF8) { if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "charset", (unsigned char *) "utf-8", FALSE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } } if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "digest-uri", digesturi, TRUE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } if (add_to_challenge(params->utils, &text->out_buf, &text->out_buf_len, &resplen, "response", (unsigned char *) response, FALSE) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } /* self check */ if (strlen(text->out_buf) > 2048) { result = SASL_FAIL; goto FreeAllocatedMem; } /* set oparams */ oparams->maxoutbuf = text->global->server_maxbuf; if(oparams->mech_ssf > 1) { /* MAC block (privacy) */ oparams->maxoutbuf -= 25; } else if(oparams->mech_ssf == 1) { /* MAC block (integrity) */ oparams->maxoutbuf -= 16; } text->seqnum = 0; /* for integrity/privacy */ text->rec_seqnum = 0; /* for integrity/privacy */ text->utils = params->utils; text->maxbuf = text->global->server_maxbuf; /* used by layers */ text->size = -1; text->needsize = 4; text->buffer = NULL; if (oparams->mech_ssf > 0) { char enckey[16]; char deckey[16]; create_layer_keys(text, params->utils,text->HA1,n,enckey,deckey); /* initialize cipher if need be */ if (text->cipher_init) text->cipher_init(text, enckey, deckey); } result = SASL_OK; FreeAllocatedMem: if (digesturi) params->utils->free(digesturi); if (response) params->utils->free(response); return result; } static int digestmd5_client_mech_new(void *glob_context, sasl_client_params_t * params, void **conn_context) { context_t *text; /* holds state are in -- allocate client size */ text = params->utils->malloc(sizeof(client_context_t)); if (text == NULL) return SASL_NOMEM; memset(text, 0, sizeof(client_context_t)); text->state = 1; text->i_am = CLIENT; text->global = glob_context; *conn_context = text; return SASL_OK; } /* Apple: reauth is not thread-safe so we are not using it */ #if 0 static int digestmd5_client_mech_step1(client_context_t *ctext, sasl_client_params_t *params, const char *serverin __attribute__((unused)), unsigned serverinlen __attribute__((unused)), sasl_interact_t **prompt_need, const char **clientout, unsigned *clientoutlen, sasl_out_params_t *oparams) { context_t *text = (context_t *) ctext; const char *authid = NULL, *userid = NULL; int user_result = SASL_OK; int auth_result = SASL_OK; int pass_result = SASL_OK; int result = SASL_FAIL; unsigned int n = 0; params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 client step 1"); /* try to get the authid */ if (oparams->authid == NULL) { auth_result = _plug_get_authid(params->utils, &authid, prompt_need); if ((auth_result != SASL_OK) && (auth_result != SASL_INTERACT)) return auth_result; } /* try to get the userid */ if (oparams->user == NULL) { user_result = _plug_get_userid(params->utils, &userid, prompt_need); if ((user_result != SASL_OK) && (user_result != SASL_INTERACT)) return user_result; } /* try to get the password */ if (ctext->password == NULL) { pass_result = _plug_get_password(params->utils, &ctext->password, &ctext->free_password, prompt_need); if ((pass_result != SASL_OK) && (pass_result != SASL_INTERACT)) return pass_result; } /* free prompts we got */ if (prompt_need && *prompt_need) { params->utils->free(*prompt_need); *prompt_need = NULL; } /* if there are prompts not filled in */ if ((user_result == SASL_INTERACT) || (auth_result == SASL_INTERACT) || (pass_result == SASL_INTERACT)) { /* make the prompt list */ result = _plug_make_prompts(params->utils, prompt_need, user_result == SASL_INTERACT ? "Please enter your authorization name" : NULL, NULL, auth_result == SASL_INTERACT ? "Please enter your authentication name" : NULL, NULL, pass_result == SASL_INTERACT ? "Please enter your password" : NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL); if (result != SASL_OK) return result; return SASL_INTERACT; } if (!userid || !*userid) { result = params->canon_user(params->utils->conn, authid, 0, SASL_CU_AUTHID | SASL_CU_AUTHZID, oparams); } else { result = params->canon_user(params->utils->conn, authid, 0, SASL_CU_AUTHID, oparams); if (result != SASL_OK) return result; result = params->canon_user(params->utils->conn, userid, 0, SASL_CU_AUTHZID, oparams); } if (result != SASL_OK) return result; if (!strcmp(oparams->authid, text->global->authid)) { if (!strcmp(text->global->qop, "auth-conf")) { /* confidentiality */ oparams->encode = &digestmd5_privacy_encode; oparams->decode = &digestmd5_privacy_decode; oparams->mech_ssf = text->global->bestcipher->ssf; n = text->global->bestcipher->n; text->cipher_enc = text->global->bestcipher->cipher_enc; text->cipher_dec = text->global->bestcipher->cipher_dec; text->cipher_free = text->global->bestcipher->cipher_free; text->cipher_init = text->global->bestcipher->cipher_init; } else if (!strcmp(text->global->qop, "auth-int")) { /* integrity */ oparams->encode = &digestmd5_integrity_encode; oparams->decode = &digestmd5_integrity_decode; oparams->mech_ssf = 1; } else { /* no layer */ oparams->encode = NULL; oparams->decode = NULL; oparams->mech_ssf = 0; } ctext->realm = text->global->realm; text->global->nonce_count++; if (make_client_response(text, params, oparams, n) == SASL_OK) { *clientoutlen = strlen(text->out_buf); *clientout = text->out_buf; } ctext->realm = NULL; } text->state = 2; return SASL_CONTINUE; } #endif static int digestmd5_client_mech_step2(client_context_t *ctext, sasl_client_params_t *params, const char *serverin, unsigned serverinlen, sasl_interact_t **prompt_need, const char **clientout, unsigned *clientoutlen, sasl_out_params_t *oparams) { context_t *text = (context_t *) ctext; char *in = NULL; char *in_start; sasl_ssf_t limit, musthave = 0; sasl_ssf_t external; int protection = 0; int ciphers = 0; struct digest_cipher *bestcipher = NULL; unsigned int n = 0; char **realms = NULL, *realm_chal = NULL; int nrealm = 0; unsigned int server_maxbuf = 65536; /* Default value for maxbuf */ int maxbuf_count = 0; bool IsUTF8 = FALSE; int result = SASL_FAIL; const char *authid = NULL, *userid = NULL; int user_result = SASL_OK; int auth_result = SASL_OK; int pass_result = SASL_OK; int realm_result = SASL_OK; int algorithm_count = 0; params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 client step 2"); if (params->props.min_ssf > params->props.max_ssf) { return SASL_BADPARAM; } in = params->utils->malloc(serverinlen + 1); if (in == NULL) return SASL_NOMEM; memcpy(in, serverin, serverinlen); in[serverinlen] = 0; in_start = in; /* parse what we got */ while (in[0] != '\0') { char *name, *value; get_pair(&in, &name, &value); /* if parse error */ if (name == NULL) { params->utils->seterror(params->utils->conn, 0, "Parse error"); result = SASL_FAIL; goto FreeAllocatedMem; } if (strcasecmp(name, "realm") == 0) { nrealm++; if(!realms) realms = params->utils->malloc(sizeof(char *) * (nrealm + 1)); else realms = params->utils->realloc(realms, sizeof(char *) * (nrealm + 1)); if (realms == NULL) { result = SASL_NOMEM; goto FreeAllocatedMem; } _plug_strdup(params->utils, value, &realms[nrealm-1], NULL); realms[nrealm] = NULL; } else if (strcasecmp(name, "nonce") == 0) { if (text->global->nonce) { params->utils->free(text->global->nonce); text->global->nonce = NULL; } _plug_strdup(params->utils, value, (char **) &text->global->nonce, NULL); } else if (strcasecmp(name, "qop") == 0) { while (value && *value) { char *comma = strchr(value, ','); if (comma != NULL) { *comma++ = '\0'; } if (strcasecmp(value, "auth-conf") == 0) { protection |= DIGEST_PRIVACY; } else if (strcasecmp(value, "auth-int") == 0) { protection |= DIGEST_INTEGRITY; } else if (strcasecmp(value, "auth") == 0) { protection |= DIGEST_NOLAYER; } else { params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "Server supports unknown layer: %s\n", value); } value = comma; } if (protection == 0) { result = SASL_BADAUTH; params->utils->seterror(params->utils->conn, 0, "Server doesn't support known qop level"); goto FreeAllocatedMem; } } else if (strcasecmp(name, "cipher") == 0) { while (value && *value) { char *comma = strchr(value, ','); struct digest_cipher *cipher = available_ciphers; if (comma != NULL) { *comma++ = '\0'; } /* do we support this cipher? */ while (cipher->name) { if (!strcasecmp(value, cipher->name)) break; cipher++; } if (cipher->name) { ciphers |= cipher->flag; } else { params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "Server supports unknown cipher: %s\n", value); } value = comma; } } else if (strcasecmp(name, "stale") == 0) { /* XXX do we need to do something ??? */ } else if (strcasecmp(name, "maxbuf") == 0) { /* maxbuf A number indicating the size of the largest * buffer the server is able to receive when using * "auth-int". If this directive is missing, the default * value is 65536. This directive may appear at most once; * if multiple instances are present, the client should * abort the authentication exchange. */ maxbuf_count++; if (maxbuf_count != 1) { result = SASL_BADAUTH; params->utils->seterror(params->utils->conn, 0, "At least two maxbuf directives found. Authentication aborted"); goto FreeAllocatedMem; } else if (sscanf(value, "%u", &server_maxbuf) != 1) { result = SASL_BADAUTH; params->utils->seterror(params->utils->conn, 0, "Invalid maxbuf parameter received from server"); goto FreeAllocatedMem; } else { if (server_maxbuf<=16) { result = SASL_BADAUTH; params->utils->seterror(params->utils->conn, 0, "Invalid maxbuf parameter received from server (too small)"); goto FreeAllocatedMem; } } } else if (strcasecmp(name, "charset") == 0) { if (strcasecmp(value, "utf-8") != 0) { result = SASL_BADAUTH; params->utils->seterror(params->utils->conn, 0, "Charset must be UTF-8"); goto FreeAllocatedMem; } else { IsUTF8 = TRUE; } } else if (strcasecmp(name,"algorithm")==0) { if (strcasecmp(value, "md5-sess") != 0) { params->utils->seterror(params->utils->conn, 0, "'algorithm' isn't 'md5-sess'"); result = SASL_FAIL; goto FreeAllocatedMem; } algorithm_count++; if (algorithm_count > 1) { params->utils->seterror(params->utils->conn, 0, "Must see 'algorithm' only once"); result = SASL_FAIL; goto FreeAllocatedMem; } } else { params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 unrecognized pair %s/%s: ignoring", name, value); } } if (algorithm_count != 1) { params->utils->seterror(params->utils->conn, 0, "Must see 'algorithm' once. Didn't see at all"); result = SASL_FAIL; goto FreeAllocatedMem; } /* make sure we have everything we require */ if (text->global->nonce == NULL) { params->utils->seterror(params->utils->conn, 0, "Don't have nonce."); result = SASL_FAIL; goto FreeAllocatedMem; } text->global->server_maxbuf = server_maxbuf; /* make callbacks */ /* try to get the authid */ if (oparams->authid == NULL) { auth_result = _plug_get_authid(params->utils, &authid, prompt_need); if ((auth_result != SASL_OK) && (auth_result != SASL_INTERACT)) { result = auth_result; goto FreeAllocatedMem; } } /* try to get the userid */ if (oparams->user == NULL) { user_result = _plug_get_userid(params->utils, &userid, prompt_need); if ((user_result != SASL_OK) && (user_result != SASL_INTERACT)) return user_result; } /* try to get the password */ if (ctext->password == NULL) { pass_result = _plug_get_password(params->utils, &ctext->password, &ctext->free_password, prompt_need); if ((pass_result != SASL_OK) && (pass_result != SASL_INTERACT)) { result = pass_result; goto FreeAllocatedMem; } } /* try to get the realm, if needed */ if (nrealm == 1 && ctext->realm == NULL) { /* only one choice! */ ctext->realm = realms[0]; } if (ctext->realm == NULL) { realm_result = _plug_get_realm(params->utils, (const char **) realms, (const char **) &ctext->realm, prompt_need); if ((realm_result != SASL_OK) && (realm_result != SASL_INTERACT)) { /* Fake the realm, if we can. */ if (params->serverFQDN) { ctext->realm = (char *) params->serverFQDN; } else { result = realm_result; goto FreeAllocatedMem; } } /* if realm_result == SASL_OK, ctext->realm has been filled in */ } /* free prompts we got */ if (prompt_need && *prompt_need) { params->utils->free(*prompt_need); *prompt_need = NULL; } /* if there are prompts not filled in */ if ((user_result == SASL_INTERACT) || (auth_result == SASL_INTERACT) || (pass_result == SASL_INTERACT) || (realm_result == SASL_INTERACT)) { int result = SASL_OK; /* make our default realm */ if ((realm_result == SASL_INTERACT) && params->serverFQDN) { realm_chal = params->utils->malloc(3+strlen(params->serverFQDN)); if (realm_chal) { sprintf(realm_chal, "{%s}", params->serverFQDN); } else { result = SASL_NOMEM; } } /* make the prompt list */ if (result == SASL_OK) { result = _plug_make_prompts(params->utils, prompt_need, user_result == SASL_INTERACT ? "Please enter your authorization name" : NULL, NULL, auth_result == SASL_INTERACT ? "Please enter your authentication name" : NULL, NULL, pass_result == SASL_INTERACT ? "Please enter your password" : NULL, NULL, NULL, NULL, NULL, realm_chal ? realm_chal : "{}", realm_result == SASL_INTERACT ? "Please enter your realm" : NULL, params->serverFQDN ? params->serverFQDN : NULL); } if ( realm_chal != NULL ) { params->utils->free( realm_chal ); realm_chal = NULL; } if (in_start) params->utils->free(in_start); if (text->global->nonce) { params->utils->free(text->global->nonce); text->global->nonce = NULL; } if (realms) { int lup; /* need to free all the realms */ for (lup = 0; lup < nrealm; lup++) params->utils->free(realms[lup]); params->utils->free(realms); } /* need to NULL the realm for the next pass */ ctext->realm = NULL; if (result != SASL_OK) return result; return SASL_INTERACT; } if (oparams->authid == NULL) { if (!userid || !*userid) { result = params->canon_user(params->utils->conn, authid, 0, SASL_CU_AUTHID | SASL_CU_AUTHZID, oparams); } else { result = params->canon_user(params->utils->conn, authid, 0, SASL_CU_AUTHID, oparams); if (result != SASL_OK) goto FreeAllocatedMem; result = params->canon_user(params->utils->conn, userid, 0, SASL_CU_AUTHZID, oparams); } if (result != SASL_OK) goto FreeAllocatedMem; } /* * (username | realm | nonce | cnonce | nonce-count | qop digest-uri | * response | maxbuf | charset | auth-param ) */ /* get requested ssf */ external = params->external_ssf; /* what do we _need_? how much is too much? */ if (params->props.max_ssf > external) { limit = params->props.max_ssf - external; } else { limit = 0; } if (params->props.min_ssf > external) { musthave = params->props.min_ssf - external; } else { musthave = 0; } /* we now go searching for an option that gives us at least "musthave" and at most "limit" bits of ssf. */ if ((limit > 1) && (protection & DIGEST_PRIVACY)) { struct digest_cipher *cipher; /* let's find an encryption scheme that we like */ cipher = available_ciphers; bestcipher = NULL; while (cipher->name) { /* examine each cipher we support, see if it meets our security requirements, and see if the server supports it. choose the best one of these */ if ((limit >= cipher->ssf) && (musthave <= cipher->ssf) && (ciphers & cipher->flag) && (!bestcipher || (cipher->ssf > bestcipher->ssf))) { bestcipher = cipher; } cipher++; } if (bestcipher) { /* we found a cipher we like */ text->global->bestcipher = bestcipher; oparams->encode = &digestmd5_privacy_encode; oparams->decode = &digestmd5_privacy_decode; oparams->mech_ssf = bestcipher->ssf; text->global->qop = "auth-conf"; n = bestcipher->n; text->cipher_enc = bestcipher->cipher_enc; text->cipher_dec = bestcipher->cipher_dec; text->cipher_free = bestcipher->cipher_free; text->cipher_init = bestcipher->cipher_init; } else { /* we didn't find any ciphers we like */ params->utils->seterror(params->utils->conn, 0, "No good privacy layers"); text->global->qop = NULL; } } if (text->global->qop == NULL) { /* we failed to find an encryption layer we liked; can we use integrity or nothing? */ if ((limit >= 1) && (musthave <= 1) && (protection & DIGEST_INTEGRITY)) { /* integrity */ oparams->encode = &digestmd5_integrity_encode; oparams->decode = &digestmd5_integrity_decode; oparams->mech_ssf = 1; text->global->qop = "auth-int"; } else if (musthave <= 0) { /* no layer */ oparams->encode = NULL; oparams->decode = NULL; oparams->mech_ssf = 0; text->global->qop = "auth"; /* See if server supports not having a layer */ if ((protection & DIGEST_NOLAYER) != DIGEST_NOLAYER) { params->utils->seterror(params->utils->conn, 0, "Server doesn't support \"no layer\""); result = SASL_FAIL; goto FreeAllocatedMem; } } else { params->utils->seterror(params->utils->conn, 0, "Can't find an acceptable layer"); result = SASL_TOOWEAK; goto FreeAllocatedMem; } } /* get nonce XXX have to clean up after self if fail */ ctext->lcnonce = create_nonce(params->utils); text->global->cnonce = ctext->lcnonce; if (text->global->cnonce == NULL) { params->utils->seterror(params->utils->conn, 0, "failed to create cnonce"); result = SASL_FAIL; goto FreeAllocatedMem; } text->global->nonce_count = 1; if (make_client_response(text, params, oparams, n) != SASL_OK) { result = SASL_FAIL; goto FreeAllocatedMem; } *clientoutlen = strlen(text->out_buf); *clientout = text->out_buf; /* setup for a potential reauth */ _plug_strdup(params->utils, oparams->authid, (char **) &text->global->authid, NULL); _plug_strdup(params->utils, params->serverFQDN, (char **) &text->global->serverFQDN, NULL); _plug_strdup(params->utils, ctext->realm, (char **) &text->global->realm, NULL); text->state = 3; result = SASL_CONTINUE; FreeAllocatedMem: if (in_start) params->utils->free(in_start); if (realms) { int lup; /* need to free all the realms */ for (lup = 0;lup < nrealm; lup++) params->utils->free(realms[lup]); params->utils->free(realms); } /* if we failed, re-initialize everything for a fresh start */ if ((result != SASL_CONTINUE) && (result != SASL_INTERACT)) clear_global_context(text->global, params->utils); return result; } static int digestmd5_client_mech_step3(client_context_t *ctext, sasl_client_params_t *params, const char *serverin, unsigned serverinlen, sasl_interact_t **prompt_need __attribute__((unused)), const char **clientout __attribute__((unused)), unsigned *clientoutlen __attribute__((unused)), sasl_out_params_t *oparams) { context_t *text = (context_t *) ctext; char *in = NULL; char *in_start; int result = SASL_FAIL; params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 client step 3"); /* Verify that server is really what he claims to be */ in = params->utils->malloc(serverinlen + 1); if (in == NULL) return SASL_NOMEM; memcpy(in, serverin, serverinlen); in[serverinlen] = 0; in_start = in; /* parse what we got */ while (in[0] != '\0') { char *name, *value; get_pair(&in, &name, &value); if (name == NULL) { params->utils->seterror(params->utils->conn, 0, "DIGEST-MD5 Received Garbage"); break; } if (strcasecmp(name, "rspauth") == 0) { if (strcmp(text->response_value, value) != 0) { params->utils->seterror(params->utils->conn, 0, "DIGEST-MD5: This server wants us to believe that he knows shared secret"); return SASL_FAIL; } else { oparams->doneflag = 1; oparams->param_version = 0; result = SASL_OK; break; } } else { params->utils->log(params->utils->conn, SASL_LOG_DEBUG, "DIGEST-MD5 unrecognized pair %s/%s: ignoring", name, value); } } params->utils->free(in_start); /* if we failed, re-initialize everything for a fresh start */ if (result != SASL_OK) clear_global_context(text->global, params->utils); return result; } static int digestmd5_client_mech_step(void *conn_context, sasl_client_params_t *params, const char *serverin, unsigned serverinlen, sasl_interact_t **prompt_need, const char **clientout, unsigned *clientoutlen, sasl_out_params_t *oparams) { context_t *text = (context_t *) conn_context; client_context_t *ctext = (client_context_t *) conn_context; if (serverinlen > 2048) return SASL_BADPROT; *clientout = NULL; *clientoutlen = 0; switch (text->state) { case 1: if (!serverin) { /* Apple: we know the server isn't going to let us reauth because */ /* it doesn't have a thread-safe implementation, so don't bother */ /* trying. */ #if 0 /* here's where we attempt fast reauth if possible */ if (text->global->authid && !strcasecmp(text->global->serverFQDN, params->serverFQDN)) { /* we've auth'd to this server before, so try reauth */ return digestmd5_client_mech_step1(ctext, params, serverin, serverinlen, prompt_need, clientout, clientoutlen, oparams); } #endif /* we don't have any reauth info, so just return * that there is no initial client send */ text->state = 2; return SASL_CONTINUE; } /* otherwise fall through and respond to challenge */ text->state = 2; case 2: if (strncasecmp(serverin, "rspauth=", 8) != 0) { /* we received a challenge, so re-initialize everything for a fresh start */ memset(oparams, 0, sizeof(sasl_out_params_t)); clear_global_context(text->global, params->utils); return digestmd5_client_mech_step2(ctext, params, serverin, serverinlen, prompt_need, clientout, clientoutlen, oparams); } /* otherwise fall through and check rspauth */ text->state = 3; case 3: return digestmd5_client_mech_step3(ctext, params, serverin, serverinlen, prompt_need, clientout, clientoutlen, oparams); default: params->utils->log(NULL, SASL_LOG_ERR, "Invalid DIGEST-MD5 client step %d\n", text->state); return SASL_FAIL; } return SASL_FAIL; /* should never get here */ } static void digestmd5_client_mech_dispose(void *conn_context, const sasl_utils_t *utils) { client_context_t *ctext = (client_context_t *) conn_context; if (!ctext || !utils) return; if (ctext->free_password) _plug_free_secret(utils, &ctext->password); /* Apple: we're not using reauth, so clean up now */ ((context_t *) conn_context)->global->cnonce = NULL; if (ctext->lcnonce) utils->free(ctext->lcnonce); digestmd5_common_mech_dispose(conn_context, utils); } static sasl_client_plug_t digestmd5_client_plugins[] = { { "DIGEST-MD5", #ifdef WITH_RC4 /* mech_name */ 128, /* max ssf */ #elif WITH_DES 112, #else 0, #endif SASL_SEC_NOPLAINTEXT | SASL_SEC_NOANONYMOUS | SASL_SEC_MUTUAL_AUTH, /* security_flags */ 0, //SASL_FEAT_ALLOWS_PROXY, /* features */ NULL, /* required_prompts */ NULL, /* glob_context */ &digestmd5_client_mech_new, /* mech_new */ &digestmd5_client_mech_step, /* mech_step */ &digestmd5_client_mech_dispose, /* mech_dispose */ &digestmd5_common_mech_free, /* mech_free */ NULL, /* idle */ NULL, /* spare1 */ NULL /* spare2 */ } }; int digestmd5_client_plug_init(sasl_utils_t *utils, int maxversion, int *out_version, sasl_client_plug_t **pluglist, int *plugcount) { global_context_t *glob_text; if (maxversion < SASL_CLIENT_PLUG_VERSION) return SASL_BADVERS; /* holds global state are in */ glob_text = utils->malloc(sizeof(global_context_t)); if (glob_text == NULL) return SASL_NOMEM; memset(glob_text, 0, sizeof(global_context_t)); digestmd5_client_plugins[0].glob_context = glob_text; *out_version = SASL_CLIENT_PLUG_VERSION; *pluglist = digestmd5_client_plugins; *plugcount = 1; return SASL_OK; }