/*- * Copyright (c) 1992, 1993 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD: src/crypto/telnet/libtelnet/rsaencpwd.c,v 1.1.1.1.8.1 2002/04/13 10:59:07 markm Exp $"); #ifndef lint static char sccsid[] = "@(#)rsaencpwd.c 8.3 (Berkeley) 5/30/95"; #endif /* not lint */ #ifdef RSA_ENCPWD /* * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION * ALL RIGHTS RESERVED * * "Digital Equipment Corporation authorizes the reproduction, * distribution and modification of this software subject to the following * restrictions: * * 1. Any partial or whole copy of this software, or any modification * thereof, must include this copyright notice in its entirety. * * 2. This software is supplied "as is" with no warranty of any kind, * expressed or implied, for any purpose, including any warranty of fitness * or merchantibility. DIGITAL assumes no responsibility for the use or * reliability of this software, nor promises to provide any form of * support for it on any basis. * * 3. Distribution of this software is authorized only if no profit or * remuneration of any kind is received in exchange for such distribution. * * 4. This software produces public key authentication certificates * bearing an expiration date established by DIGITAL and RSA Data * Security, Inc. It may cease to generate certificates after the expiration * date. Any modification of this software that changes or defeats * the expiration date or its effect is unauthorized. * * 5. Software that will renew or extend the expiration date of * authentication certificates produced by this software may be obtained * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA * 94065, (415)595-8782, or from DIGITAL" * */ #include #include #include #include #include #include #include "encrypt.h" #include "auth.h" #include "misc.h" #include "cdc.h" extern auth_debug_mode; static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0, AUTHTYPE_RSA_ENCPWD, }; static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, }; #define RSA_ENCPWD_AUTH 0 /* Authentication data follows */ #define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */ #define RSA_ENCPWD_ACCEPT 2 /* Accepted */ #define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */ #define NAME_SZ 40 #define CHAL_SZ 20 #define PWD_SZ 40 static KTEXT_ST auth; static char name[NAME_SZ]; static char user_passwd[PWD_SZ]; static char key_file[2*NAME_SZ]; static char lhostname[NAME_SZ]; static char challenge[CHAL_SZ]; static int challenge_len; static int Data(ap, type, d, c) Authenticator *ap; int type; void *d; int c; { unsigned char *p = str_data + 4; unsigned char *cd = (unsigned char *)d; if (c == -1) c = strlen((char *)cd); if (0) { printf("%s:%d: [%d] (%d)", str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY", str_data[3], type, c); printd(d, c); printf("\r\n"); } *p++ = ap->type; *p++ = ap->way; if (type != NULL) *p++ = type; while (c-- > 0) { if ((*p++ = *cd++) == IAC) *p++ = IAC; } *p++ = IAC; *p++ = SE; if (str_data[3] == TELQUAL_IS) printsub('>', &str_data[2], p - (&str_data[2])); return(net_write(str_data, p - str_data)); } int rsaencpwd_init(ap, server) Authenticator *ap; int server; { char *cp; FILE *fp; if (server) { str_data[3] = TELQUAL_REPLY; memset(key_file, 0, sizeof(key_file)); gethostname(lhostname, sizeof(lhostname)); if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0'; strcpy(key_file, "/etc/."); strcat(key_file, lhostname); strcat(key_file, "_privkey"); if ((fp=fopen(key_file, "r"))==NULL) return(0); fclose(fp); } else { str_data[3] = TELQUAL_IS; } return(1); } int rsaencpwd_send(ap) Authenticator *ap; { printf("[ Trying RSAENCPWD ... ]\n"); if (!UserNameRequested) { return(0); } if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) { return(0); } if (!Data(ap, NULL, (void *)NULL, 0)) { return(0); } return(1); } void rsaencpwd_is(ap, data, cnt) Authenticator *ap; unsigned char *data; int cnt; { Session_Key skey; Block datablock; char r_passwd[PWD_SZ], r_user[NAME_SZ]; char *cp, key[160]; char chalkey[160], *ptr; FILE *fp; int r, i, j, chalkey_len, len; time_t now; cnt--; switch (*data++) { case RSA_ENCPWD_AUTH: memmove((void *)auth.dat, (void *)data, auth.length = cnt); if ((fp=fopen(key_file, "r"))==NULL) { Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1); auth_finished(ap, AUTH_REJECT); return; } /* * get privkey */ fscanf(fp, "%x;", &len); for (i=0;iway & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) { register int i; time(&now); if ((now % 2) == 0) { sprintf(challenge, "%x", now); challenge_len = strlen(challenge); } else { strcpy(challenge, "randchal"); challenge_len = 8; } if ((fp=fopen(key_file, "r"))==NULL) { Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1); auth_finished(ap, AUTH_REJECT); return; } /* * skip privkey */ fscanf(fp, "%x;", &len); for (i=0;i 0) { printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n", cnt, data); } else printf("[ RSA_ENCPWD refuses authentication ]\r\n"); auth_send_retry(); return; case RSA_ENCPWD_ACCEPT: printf("[ RSA_ENCPWD accepts you ]\n"); auth_finished(ap, AUTH_USER); return; case RSA_ENCPWD_CHALLENGEKEY: /* * Verify that the response to the challenge is correct. */ memmove((void *)chalkey, (void *)data, cnt); ptr = (char *) &chalkey[0]; ptr += DecodeHeaderLength(chalkey); if (*ptr != 0x04) { return; } *ptr++; challenge_len = DecodeValueLength(ptr); ptr += NumEncodeLengthOctets(challenge_len); memmove(challenge, ptr, challenge_len); ptr += challenge_len; if (*ptr != 0x04) { return; } *ptr++; pubkey_len = DecodeValueLength(ptr); ptr += NumEncodeLengthOctets(pubkey_len); memmove(pubkey, ptr, pubkey_len); memset(user_passwd, 0, sizeof(user_passwd)); local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0); UserPassword = user_passwd; Challenge = challenge; r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey); if (r < 0) { token.length = 1; } if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) { return; } break; default: return; } } int rsaencpwd_status(ap, name, level) Authenticator *ap; char *name; int level; { if (level < AUTH_USER) return(level); if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) { strcpy(name, UserNameRequested); return(AUTH_VALID); } else { return(AUTH_USER); } } #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);} #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);} void rsaencpwd_printsub(data, cnt, buf, buflen) unsigned char *data, *buf; int cnt, buflen; { char lbuf[32]; register int i; buf[buflen-1] = '\0'; /* make sure its NULL terminated */ buflen -= 1; switch(data[3]) { case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */ strncpy((char *)buf, " REJECT ", buflen); goto common; case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */ strncpy((char *)buf, " ACCEPT ", buflen); common: BUMP(buf, buflen); if (cnt <= 4) break; ADDC(buf, buflen, '"'); for (i = 4; i < cnt; i++) ADDC(buf, buflen, data[i]); ADDC(buf, buflen, '"'); ADDC(buf, buflen, '\0'); break; case RSA_ENCPWD_AUTH: /* Authentication data follows */ strncpy((char *)buf, " AUTH", buflen); goto common2; case RSA_ENCPWD_CHALLENGEKEY: strncpy((char *)buf, " CHALLENGEKEY", buflen); goto common2; default: sprintf(lbuf, " %d (unknown)", data[3]); strncpy((char *)buf, lbuf, buflen); common2: BUMP(buf, buflen); for (i = 4; i < cnt; i++) { sprintf(lbuf, " %d", data[i]); strncpy((char *)buf, lbuf, buflen); BUMP(buf, buflen); } break; } } int rsaencpwd_passwdok(name, passwd) char *name, *passwd; { char *crypt(); char *salt, *p; struct passwd *pwd; int passwdok_status = 0; if (pwd = getpwnam(name)) salt = pwd->pw_passwd; else salt = "xx"; p = crypt(passwd, salt); if (pwd && !strcmp(p, pwd->pw_passwd)) { passwdok_status = 1; } else passwdok_status = 0; return(passwdok_status); } #endif