/* common.c - Functions that are common to server and clinet * Rob Siemborski * Tim Martin * $Id: common.c,v 1.4 2003/02/24 23:59:27 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 #ifdef HAVE_SYSLOG #include #endif #include #include #include #include #include #include "saslint.h" #ifdef WIN32 /* need to handle the fact that errno has been defined as a function in a dll, not an extern int */ # ifdef errno # undef errno # endif /* errno */ #endif /* WIN32 */ #ifdef HAVE_UNISTD_H #include #endif static const char build_ident[] = "$Build: libsasl " PACKAGE "-" VERSION " $"; /* Should be a null-terminated array that lists the available mechanisms */ static const char **global_mech_list = NULL; void *free_mutex = NULL; void (*_sasl_client_cleanup_hook)(void) = NULL; void (*_sasl_server_cleanup_hook)(void) = NULL; int (*_sasl_client_idle_hook)(sasl_conn_t *conn) = NULL; int (*_sasl_server_idle_hook)(sasl_conn_t *conn) = NULL; sasl_allocation_utils_t _sasl_allocation_utils={ (sasl_malloc_t *) &malloc, (sasl_calloc_t *) &calloc, (sasl_realloc_t *) &realloc, (sasl_free_t *) &free }; /* Intenal mutex functions do as little as possible (no thread protection) */ static void *sasl_mutex_alloc(void) { return (void *)0x1; } static int sasl_mutex_lock(void *mutex __attribute__((unused))) { return SASL_OK; } static int sasl_mutex_unlock(void *mutex __attribute__((unused))) { return SASL_OK; } static void sasl_mutex_free(void *mutex __attribute__((unused))) { return; } sasl_mutex_utils_t _sasl_mutex_utils={ &sasl_mutex_alloc, &sasl_mutex_lock, &sasl_mutex_unlock, &sasl_mutex_free }; void sasl_set_mutex(sasl_mutex_alloc_t *n, sasl_mutex_lock_t *l, sasl_mutex_unlock_t *u, sasl_mutex_free_t *d) { _sasl_mutex_utils.alloc=n; _sasl_mutex_utils.lock=l; _sasl_mutex_utils.unlock=u; _sasl_mutex_utils.free=d; } /* copy a string to malloced memory */ int _sasl_strdup(const char *in, char **out, size_t *outlen) { size_t len = strlen(in); if (outlen) *outlen = len; *out=sasl_ALLOC(len + 1); if (! *out) return SASL_NOMEM; strcpy((char *) *out, in); return SASL_OK; } /* adds a string to the buffer; reallocing if need be */ int _sasl_add_string(char **out, size_t *alloclen, size_t *outlen, const char *add) { size_t addlen; if (add==NULL) add = "(null)"; addlen=strlen(add); /* only compute once */ if (_buf_alloc(out, alloclen, (*outlen)+addlen)!=SASL_OK) return SASL_NOMEM; strncpy(*out + *outlen, add, addlen); *outlen += addlen; return SASL_OK; } /* security-encode a regular string. Mostly a wrapper for sasl_encodev */ /* output is only valid until next call to sasl_encode or sasl_encodev */ int sasl_encode(sasl_conn_t *conn, const char *input, unsigned inputlen, const char **output, unsigned *outputlen) { int result; struct iovec tmp; if(!conn) return SASL_BADPARAM; if(!input || !inputlen || !output || !outputlen) PARAMERROR(conn); /* maxoutbuf checking is done in sasl_encodev */ /* Note: We are casting a const pointer here, but it's okay * because we believe people downstream of us are well-behaved, and the * alternative is an absolute mess, performance-wise. */ tmp.iov_base = (void *)input; tmp.iov_len = inputlen; result = sasl_encodev(conn, &tmp, 1, output, outputlen); RETURN(conn, result); } /* security-encode an iovec */ /* output is only valid until next call to sasl_encode or sasl_encodev */ int sasl_encodev(sasl_conn_t *conn, const struct iovec *invec, unsigned numiov, const char **output, unsigned *outputlen) { int result; unsigned i; size_t total_size = 0; if (!conn) return SASL_BADPARAM; if (! invec || ! output || ! outputlen || numiov < 1) PARAMERROR(conn); if(!conn->props.maxbufsize) { sasl_seterror(conn, 0, "called sasl_encode[v] with application that does not support security layers"); return SASL_TOOWEAK; } /* This might be better to check on a per-plugin basis, but I think * it's cleaner and more effective here. It also encourages plugins * to be honest about what they accept */ for(i=0; i conn->oparams.maxoutbuf) PARAMERROR(conn); if(conn->oparams.encode == NULL) { result = _iovec_to_buf(invec, numiov, &conn->encode_buf); if(result != SASL_OK) INTERROR(conn, result); *output = conn->encode_buf->data; *outputlen = conn->encode_buf->curlen; } else { result = conn->oparams.encode(conn->context, invec, numiov, output, outputlen); } RETURN(conn, result); } /* output is only valid until next call to sasl_decode */ int sasl_decode(sasl_conn_t *conn, const char *input, unsigned inputlen, const char **output, unsigned *outputlen) { int result; if(!conn) return SASL_BADPARAM; if(!input || !output || !outputlen) PARAMERROR(conn); if(!conn->props.maxbufsize) { sasl_seterror(conn, 0, "called sasl_decode with application that does not support security layers"); RETURN(conn, SASL_TOOWEAK); } if(conn->oparams.decode == NULL) { /* Since we know how long the output is maximally, we can * just allocate it to begin with, and never need another * allocation! */ /* However, if they pass us more than they actually can take, * we cannot help them... */ if(inputlen > conn->props.maxbufsize) { sasl_seterror(conn, 0, "input too large for default sasl_decode"); RETURN(conn,SASL_BUFOVER); } if(!conn->decode_buf) conn->decode_buf = sasl_ALLOC(conn->props.maxbufsize + 1); if(!conn->decode_buf) MEMERROR(conn); memcpy(conn->decode_buf, input, inputlen); conn->decode_buf[inputlen] = '\0'; *output = conn->decode_buf; *outputlen = inputlen; return SASL_OK; } else { result = conn->oparams.decode(conn->context, input, inputlen, output, outputlen); RETURN(conn, result); } INTERROR(conn, SASL_FAIL); } void sasl_set_alloc(sasl_malloc_t *m, sasl_calloc_t *c, sasl_realloc_t *r, sasl_free_t *f) { _sasl_allocation_utils.malloc=m; _sasl_allocation_utils.calloc=c; _sasl_allocation_utils.realloc=r; _sasl_allocation_utils.free=f; } void sasl_done(void) { if (_sasl_server_cleanup_hook) _sasl_server_cleanup_hook(); if (_sasl_client_cleanup_hook) _sasl_client_cleanup_hook(); _sasl_canonuser_free(); _sasl_done_with_plugins(); sasl_MUTEX_FREE(free_mutex); free_mutex = NULL; _sasl_free_utils(&sasl_global_utils); sasl_FREE(global_mech_list); global_mech_list = NULL; /* in case of another init/done */ _sasl_server_cleanup_hook = NULL; _sasl_client_cleanup_hook = NULL; _sasl_client_idle_hook = NULL; _sasl_server_idle_hook = NULL; } /* fills in the base sasl_conn_t info */ int _sasl_conn_init(sasl_conn_t *conn, const char *service, unsigned int flags, enum Sasl_conn_type type, int (*idle_hook)(sasl_conn_t *conn), const char *serverFQDN, const char *iplocalport, const char *ipremoteport, const sasl_callback_t *callbacks, const sasl_global_callbacks_t *global_callbacks) { int result = SASL_OK; conn->type = type; result = _sasl_strdup(service, &conn->service, NULL); if (result != SASL_OK) MEMERROR(conn); memset(&conn->oparams, 0, sizeof(sasl_out_params_t)); memset(&conn->external, 0, sizeof(_sasl_external_properties_t)); conn->flags = flags; result = sasl_setprop(conn, SASL_IPLOCALPORT, iplocalport); if(result != SASL_OK) RETURN(conn, result); result = sasl_setprop(conn, SASL_IPREMOTEPORT, ipremoteport); if(result != SASL_OK) RETURN(conn, result); conn->encode_buf = NULL; conn->context = NULL; conn->secret = NULL; conn->idle_hook = idle_hook; conn->callbacks = callbacks; conn->global_callbacks = global_callbacks; memset(&conn->props, 0, sizeof(conn->props)); /* Start this buffer out as an empty string */ conn->error_code = SASL_OK; conn->errdetail_buf = conn->error_buf = NULL; conn->errdetail_buf_len = conn->error_buf_len = 150; result = _buf_alloc(&conn->error_buf, &conn->error_buf_len, 150); if(result != SASL_OK) MEMERROR(conn); result = _buf_alloc(&conn->errdetail_buf, &conn->errdetail_buf_len, 150); if(result != SASL_OK) MEMERROR(conn); conn->error_buf[0] = '\0'; conn->errdetail_buf[0] = '\0'; conn->decode_buf = NULL; if(serverFQDN) { result = _sasl_strdup(serverFQDN, &conn->serverFQDN, NULL); } else if (conn->type == SASL_CONN_SERVER) { /* We can fake it because we *are* the server */ char name[MAXHOSTNAMELEN]; memset(name, 0, sizeof(name)); gethostname(name, MAXHOSTNAMELEN); result = _sasl_strdup(name, &conn->serverFQDN, NULL); } else { conn->serverFQDN = NULL; } if(result != SASL_OK) MEMERROR( conn ); RETURN(conn, SASL_OK); } /* It turns out to be conveinent to have a shared sasl_utils_t */ const sasl_utils_t *sasl_global_utils = NULL; int _sasl_common_init(void) { int result; /* Setup the global utilities */ if(!sasl_global_utils) { sasl_global_utils = _sasl_alloc_utils(NULL, NULL); if(sasl_global_utils == NULL) return SASL_NOMEM; } /* Init the canon_user plugin */ result = sasl_canonuser_add_plugin("INTERNAL", internal_canonuser_init); if(result != SASL_OK) return result; if (!free_mutex) free_mutex = sasl_MUTEX_ALLOC(); if (!free_mutex) return SASL_FAIL; return SASL_OK; } /* dispose connection state, sets it to NULL * checks for pointer to NULL */ void sasl_dispose(sasl_conn_t **pconn) { int result; if (! pconn) return; if (! *pconn) return; /* serialize disposes. this is necessary because we can't dispose of conn->mutex if someone else is locked on it */ result = sasl_MUTEX_LOCK(free_mutex); if (result!=SASL_OK) return; /* *pconn might have become NULL by now */ if (! (*pconn)) return; (*pconn)->destroy_conn(*pconn); sasl_FREE(*pconn); *pconn=NULL; sasl_MUTEX_UNLOCK(free_mutex); } void _sasl_conn_dispose(sasl_conn_t *conn) { if (conn->serverFQDN) sasl_FREE(conn->serverFQDN); if (conn->external.auth_id) sasl_FREE(conn->external.auth_id); if(conn->encode_buf) { if(conn->encode_buf->data) sasl_FREE(conn->encode_buf->data); sasl_FREE(conn->encode_buf); } if(conn->error_buf) sasl_FREE(conn->error_buf); if(conn->errdetail_buf) sasl_FREE(conn->errdetail_buf); if(conn->decode_buf) sasl_FREE(conn->decode_buf); if(conn->mechlist_buf) sasl_FREE(conn->mechlist_buf); if(conn->service) sasl_FREE(conn->service); /* oparams sub-members should be freed by the plugin, in so much * as they were allocated by the plugin */ } /* get property from SASL connection state * propnum -- property number * pvalue -- pointer to value * returns: * SASL_OK -- no error * SASL_NOTDONE -- property not available yet * SASL_BADPARAM -- bad property number */ int sasl_getprop(sasl_conn_t *conn, int propnum, const void **pvalue) { int result = SASL_OK; sasl_getopt_t *getopt; void *context; if (! conn) return SASL_BADPARAM; if (! pvalue) PARAMERROR(conn); switch(propnum) { case SASL_SSF: *(sasl_ssf_t **)pvalue= &conn->oparams.mech_ssf; break; case SASL_MAXOUTBUF: *(unsigned **)pvalue = &conn->oparams.maxoutbuf; break; case SASL_GETOPTCTX: result = _sasl_getcallback(conn, SASL_CB_GETOPT, &getopt, &context); if(result != SASL_OK) break; *(void **)pvalue = context; break; case SASL_CALLBACK: *(const sasl_callback_t **)pvalue = conn->callbacks; break; case SASL_IPLOCALPORT: if(conn->got_ip_local) *(const char **)pvalue = conn->iplocalport; else { *(const char **)pvalue = NULL; result = SASL_NOTDONE; } break; case SASL_IPREMOTEPORT: if(conn->got_ip_remote) *(const char **)pvalue = conn->ipremoteport; else { *(const char **)pvalue = NULL; result = SASL_NOTDONE; } break; case SASL_USERNAME: if(! conn->oparams.user) result = SASL_NOTDONE; else *((const char **)pvalue) = conn->oparams.user; break; case SASL_SERVERFQDN: *((const char **)pvalue) = conn->serverFQDN; break; case SASL_DEFUSERREALM: if(conn->type != SASL_CONN_SERVER) result = SASL_BADPROT; else *((const char **)pvalue) = ((sasl_server_conn_t *)conn)->user_realm; break; case SASL_SERVICE: *((const char **)pvalue) = conn->service; break; case SASL_AUTHSOURCE: /* name of plugin (not name of mech) */ if(conn->type == SASL_CONN_CLIENT) { if(!((sasl_client_conn_t *)conn)->mech) { result = SASL_NOTDONE; break; } *((const char **)pvalue) = ((sasl_client_conn_t *)conn)->mech->plugname; } else if (conn->type == SASL_CONN_SERVER) { if(!((sasl_server_conn_t *)conn)->mech) { result = SASL_NOTDONE; break; } *((const char **)pvalue) = ((sasl_server_conn_t *)conn)->mech->plugname; } else { result = SASL_BADPARAM; } break; case SASL_MECHNAME: /* name of mech */ if(conn->type == SASL_CONN_CLIENT) { if(!((sasl_client_conn_t *)conn)->mech) { result = SASL_NOTDONE; break; } *((const char **)pvalue) = ((sasl_client_conn_t *)conn)->mech->plug->mech_name; } else if (conn->type == SASL_CONN_SERVER) { if(!((sasl_server_conn_t *)conn)->mech) { result = SASL_NOTDONE; break; } *((const char **)pvalue) = ((sasl_server_conn_t *)conn)->mech->plug->mech_name; } else { result = SASL_BADPARAM; } if(!(*pvalue) && result == SASL_OK) result = SASL_NOTDONE; break; case SASL_PLUGERR: *((const char **)pvalue) = conn->error_buf; break; case SASL_SSF_EXTERNAL: *((const sasl_ssf_t **)pvalue) = &conn->external.ssf; break; case SASL_AUTH_EXTERNAL: *((const char **)pvalue) = conn->external.auth_id; break; case SASL_SEC_PROPS: *((const sasl_security_properties_t **)pvalue) = &conn->props; break; default: result = SASL_BADPARAM; } if(result == SASL_BADPARAM) { PARAMERROR(conn); } else if(result == SASL_NOTDONE) { sasl_seterror(conn, SASL_NOLOG, "Information that was requested is not yet available."); RETURN(conn, result); } else if(result != SASL_OK) { INTERROR(conn, result); } else RETURN(conn, result); } /* set property in SASL connection state * returns: * SASL_OK -- value set * SASL_BADPARAM -- invalid property or value */ int sasl_setprop(sasl_conn_t *conn, int propnum, const void *value) { int result = SASL_OK; char *str; /* make sure the sasl context is valid */ if (!conn) return SASL_BADPARAM; switch(propnum) { case SASL_SSF_EXTERNAL: conn->external.ssf = *((sasl_ssf_t *)value); break; case SASL_AUTH_EXTERNAL: if(value && strlen(value)) { result = _sasl_strdup(value, &str, NULL); if(result != SASL_OK) MEMERROR(conn); } else { str = NULL; } if(conn->external.auth_id) sasl_FREE(conn->external.auth_id); conn->external.auth_id = str; break; case SASL_DEFUSERREALM: if(conn->type != SASL_CONN_SERVER) { sasl_seterror(conn, 0, "Tried to set realm on non-server connection"); result = SASL_BADPROT; break; } if(value && strlen(value)) { result = _sasl_strdup(value, &str, NULL); if(result != SASL_OK) MEMERROR(conn); } else { PARAMERROR(conn); } if(((sasl_server_conn_t *)conn)->user_realm) sasl_FREE(((sasl_server_conn_t *)conn)->user_realm); ((sasl_server_conn_t *)conn)->user_realm = str; ((sasl_server_conn_t *)conn)->sparams->user_realm = str; break; case SASL_SEC_PROPS: memcpy(&(conn->props),(sasl_security_properties_t *)value, sizeof(sasl_security_properties_t)); break; case SASL_IPREMOTEPORT: { const char *ipremoteport = (const char *)value; if(!value) { conn->got_ip_remote = 0; } else if (_sasl_ipfromstring(ipremoteport, NULL, 0) != SASL_OK) { sasl_seterror(conn, 0, "Bad IPREMOTEPORT value"); RETURN(conn, SASL_BADPARAM); } else { strcpy(conn->ipremoteport, ipremoteport); conn->got_ip_remote = 1; } if(conn->got_ip_remote) { if(conn->type == SASL_CONN_CLIENT) { ((sasl_client_conn_t *)conn)->cparams->ipremoteport = conn->ipremoteport; } else if (conn->type == SASL_CONN_SERVER) { ((sasl_server_conn_t *)conn)->sparams->ipremoteport = conn->ipremoteport; } } else { if(conn->type == SASL_CONN_CLIENT) { ((sasl_client_conn_t *)conn)->cparams->ipremoteport = NULL; } else if (conn->type == SASL_CONN_SERVER) { ((sasl_server_conn_t *)conn)->sparams->ipremoteport = NULL; } } break; } case SASL_IPLOCALPORT: { const char *iplocalport = (const char *)value; if(!value) { conn->got_ip_local = 0; } else if (_sasl_ipfromstring(iplocalport, NULL, 0) != SASL_OK) { sasl_seterror(conn, 0, "Bad IPLOCALPORT value"); RETURN(conn, SASL_BADPARAM); } else { strcpy(conn->iplocalport, iplocalport); conn->got_ip_local = 1; } if(conn->got_ip_local) { if(conn->type == SASL_CONN_CLIENT) { ((sasl_client_conn_t *)conn)->cparams->iplocalport = conn->iplocalport; } else if (conn->type == SASL_CONN_SERVER) { ((sasl_server_conn_t *)conn)->sparams->iplocalport = conn->iplocalport; } } else { if(conn->type == SASL_CONN_CLIENT) { ((sasl_client_conn_t *)conn)->cparams->iplocalport = NULL; } else if (conn->type == SASL_CONN_SERVER) { ((sasl_server_conn_t *)conn)->sparams->iplocalport = NULL; } } break; } default: sasl_seterror(conn, 0, "Unknown parameter type"); result = SASL_BADPARAM; } RETURN(conn, result); } /* this is apparently no longer a user function */ static int sasl_usererr(int saslerr) { /* Hide the difference in a username failure and a password failure */ if (saslerr == SASL_NOUSER) return SASL_BADAUTH; /* otherwise return the error given; no transform necessary */ return saslerr; } const char *sasl_errstring(int saslerr, const char *langlist __attribute__((unused)), const char **outlang) { if (outlang) *outlang="en-us"; switch(saslerr) { case SASL_CONTINUE: return "another step is needed in authentication"; case SASL_OK: return "successful result"; case SASL_FAIL: return "generic failure"; case SASL_NOMEM: return "no memory available"; case SASL_BUFOVER: return "overflowed buffer"; case SASL_NOMECH: return "no mechanism available"; case SASL_BADPROT: return "bad protocol / cancel"; case SASL_NOTDONE: return "can't request info until later in exchange"; case SASL_BADPARAM: return "invalid parameter supplied"; case SASL_TRYAGAIN: return "transient failure (e.g., weak key)"; case SASL_BADMAC: return "integrity check failed"; case SASL_NOTINIT: return "SASL library not initialized"; /* -- client only codes -- */ case SASL_INTERACT: return "needs user interaction"; case SASL_BADSERV: return "server failed mutual authentication step"; case SASL_WRONGMECH: return "mechanism doesn't support requested feature"; /* -- server only codes -- */ case SASL_BADAUTH: return "authentication failure"; case SASL_NOAUTHZ: return "authorization failure"; case SASL_TOOWEAK: return "mechanism too weak for this user"; case SASL_ENCRYPT: return "encryption needed to use mechanism"; case SASL_TRANS: return "One time use of a plaintext password will enable requested mechanism for user"; case SASL_EXPIRED: return "passphrase expired, has to be reset"; case SASL_DISABLED: return "account disabled"; case SASL_NOUSER: return "user not found"; case SASL_BADVERS: return "version mismatch with plug-in"; case SASL_UNAVAIL: return "remote authentication server unavailable"; case SASL_NOVERIFY: return "user exists, but no verifier for user"; case SASL_PWLOCK: return "passphrase locked"; case SASL_NOCHANGE: return "requested change was not needed"; case SASL_WEAKPASS: return "passphrase is too weak for security policy"; case SASL_NOUSERPASS: return "user supplied passwords are not permitted"; default: return "undefined error!"; } } /* Return the sanitized error detail about the last error that occured for * a connection */ const char *sasl_errdetail(sasl_conn_t *conn) { unsigned need_len; const char *errstr; char leader[128]; if(!conn) return NULL; errstr = sasl_errstring(conn->error_code, NULL, NULL); snprintf(leader,128,"SASL(%d): %s: ", sasl_usererr(conn->error_code), errstr); need_len = strlen(leader) + strlen(conn->error_buf) + 12; _buf_alloc(&conn->errdetail_buf, &conn->errdetail_buf_len, need_len); snprintf(conn->errdetail_buf, need_len, "%s%s", leader, conn->error_buf); return conn->errdetail_buf; } /* Note that this needs the global callbacks, so if you don't give getcallbacks * a sasl_conn_t, you're going to need to pass it yourself (or else we couldn't * have client and server at the same time */ static int _sasl_global_getopt(void *context, const char *plugin_name, const char *option, const char ** result, size_t *len) { const sasl_global_callbacks_t * global_callbacks; const sasl_callback_t *callback; global_callbacks = (const sasl_global_callbacks_t *) context; if (global_callbacks && global_callbacks->callbacks) { for (callback = global_callbacks->callbacks; callback->id != SASL_CB_LIST_END; callback++) { if (callback->id == SASL_CB_GETOPT && (((sasl_getopt_t *)(callback->proc))(callback->context, plugin_name, option, result, (unsigned *)len) == SASL_OK)) return SASL_OK; } } /* look it up in our configuration file */ *result = sasl_config_getstring(option, NULL); if (*result != NULL) { if (len) { *len = strlen(*result); } return SASL_OK; } return SASL_FAIL; } static int _sasl_conn_getopt(void *context, const char *plugin_name, const char *option, const char ** result, unsigned *len) { sasl_conn_t * conn; const sasl_callback_t *callback; if (! context) return SASL_BADPARAM; conn = (sasl_conn_t *) context; if (conn->callbacks) for (callback = conn->callbacks; callback->id != SASL_CB_LIST_END; callback++) if (callback->id == SASL_CB_GETOPT && (((sasl_getopt_t *)(callback->proc))(callback->context, plugin_name, option, result, len) == SASL_OK)) return SASL_OK; /* If we made it here, we didn't find an appropriate callback * in the connection's callback list, or the callback we did * find didn't return SASL_OK. So we attempt to use the * global callback for this connection... */ return _sasl_global_getopt((void *)conn->global_callbacks, plugin_name, option, result, len); } #ifdef HAVE_SYSLOG /* this is the default logging */ static int _sasl_syslog(void *context __attribute__((unused)), int priority, const char *message) { int syslog_priority; /* set syslog priority */ switch(priority) { case SASL_LOG_NONE: return SASL_OK; break; case SASL_LOG_ERR: syslog_priority = LOG_ERR; break; case SASL_LOG_WARN: syslog_priority = LOG_WARNING; break; case SASL_LOG_NOTE: case SASL_LOG_FAIL: syslog_priority = LOG_NOTICE; break; case SASL_LOG_PASS: case SASL_LOG_TRACE: case SASL_LOG_DEBUG: default: syslog_priority = LOG_DEBUG; break; } /* do the syslog call. do not need to call openlog */ syslog(syslog_priority | LOG_AUTH, "%s", message); return SASL_OK; } #endif /* HAVE_SYSLOG */ static int _sasl_getsimple(void *context, int id, const char ** result, size_t *len) { const char *userid; sasl_conn_t *conn; if (! context || ! result) return SASL_BADPARAM; conn = (sasl_conn_t *)context; switch(id) { case SASL_CB_AUTHNAME: userid = getenv("USER"); if (userid != NULL) { *result = userid; if (len) *len = strlen(userid); return SASL_OK; } userid = getenv("USERNAME"); if (userid != NULL) { *result = userid; if (len) *len = strlen(userid); return SASL_OK; } #ifdef WIN32 /* for win32, try using the GetUserName standard call */ { DWORD i; BOOL rval; static char sender[128]; i = sizeof(sender); rval = GetUserName(sender, &i); if ( rval) { /* got a userid */ *result = sender; if (len) *len = strlen(sender); return SASL_OK; } } #endif /* WIN32 */ return SASL_FAIL; default: return SASL_BADPARAM; } } static int _sasl_getpath(void *context __attribute__((unused)), const char **path) { if (! path) return SASL_BADPARAM; *path = getenv(SASL_PATH_ENV_VAR); if (! *path) *path = PLUGINDIR; return SASL_OK; } static int _sasl_verifyfile(void *context __attribute__((unused)), char *file __attribute__((unused)), int type __attribute__((unused))) { /* always say ok */ return SASL_OK; } static int _sasl_proxy_policy(sasl_conn_t *conn, void *context __attribute__((unused)), const char *requested_user, unsigned rlen, const char *auth_identity, unsigned alen, const char *def_realm __attribute__((unused)), unsigned urlen __attribute__((unused)), struct propctx *propctx __attribute__((unused))) { if (!conn) return SASL_BADPARAM; if (!requested_user || *requested_user == '\0') return SASL_OK; if (!auth_identity || !requested_user || rlen != alen || (memcmp(auth_identity, requested_user, rlen) != 0)) { sasl_seterror(conn, 0, "Requested identity not authenticated identity"); RETURN(conn, SASL_BADAUTH); } return SASL_OK; } int _sasl_getcallback(sasl_conn_t * conn, unsigned long callbackid, int (**pproc)(), void **pcontext) { const sasl_callback_t *callback; if (!pproc || !pcontext) PARAMERROR(conn); /* Some callbacks are always provided by the library */ switch (callbackid) { case SASL_CB_LIST_END: /* Nothing ever gets to provide this */ INTERROR(conn, SASL_FAIL); case SASL_CB_GETOPT: if (conn) { *pproc = &_sasl_conn_getopt; *pcontext = conn; } else { *pproc = &_sasl_global_getopt; *pcontext = NULL; } return SASL_OK; } /* If it's not always provided by the library, see if there's * a version provided by the application for this connection... */ if (conn && conn->callbacks) { for (callback = conn->callbacks; callback->id != SASL_CB_LIST_END; callback++) { if (callback->id == callbackid) { *pproc = callback->proc; *pcontext = callback->context; if (callback->proc) { return SASL_OK; } else { return SASL_INTERACT; } } } } /* And, if not for this connection, see if there's one * for all {server,client} connections... */ if (conn && conn->global_callbacks && conn->global_callbacks->callbacks) { for (callback = conn->global_callbacks->callbacks; callback->id != SASL_CB_LIST_END; callback++) { if (callback->id == callbackid) { *pproc = callback->proc; *pcontext = callback->context; if (callback->proc) { return SASL_OK; } else { return SASL_INTERACT; } } } } /* Otherwise, see if the library provides a default callback. */ switch (callbackid) { #ifdef HAVE_SYSLOG case SASL_CB_LOG: *pproc = (int (*)()) &_sasl_syslog; *pcontext = NULL; return SASL_OK; #endif /* HAVE_SYSLOG */ case SASL_CB_GETPATH: *pproc = (int (*)()) &_sasl_getpath; *pcontext = NULL; return SASL_OK; case SASL_CB_AUTHNAME: *pproc = (int (*)()) &_sasl_getsimple; *pcontext = conn; return SASL_OK; case SASL_CB_VERIFYFILE: *pproc = & _sasl_verifyfile; *pcontext = NULL; return SASL_OK; case SASL_CB_PROXY_POLICY: *pproc = (int (*)()) &_sasl_proxy_policy; *pcontext = NULL; return SASL_OK; } /* Unable to find a callback... */ *pproc = NULL; *pcontext = NULL; sasl_seterror(conn, SASL_NOLOG, "Unable to find a callback: %d", callbackid); RETURN(conn,SASL_FAIL); } /* * This function is typically called from a plugin. * It creates a string from the formatting and varargs given * and calls the logging callback (syslog by default) * * %m will parse the value in the next argument as an errno string * %z will parse the next argument as a SASL error code. */ void _sasl_log (sasl_conn_t *conn, int level, const char *fmt, ...) { char *out=(char *) sasl_ALLOC(250); size_t alloclen=100; /* current allocated length */ size_t outlen=0; /* current length of output buffer */ size_t formatlen; size_t pos=0; /* current position in format string */ int result; sasl_log_t *log_cb; void *log_ctx; int ival; char *cval; va_list ap; /* varargs thing */ if(!fmt) goto done; if(!out) return; formatlen = strlen(fmt); /* See if we have a logging callback... */ result = _sasl_getcallback(conn, SASL_CB_LOG, &log_cb, &log_ctx); if (result == SASL_OK && ! log_cb) result = SASL_FAIL; if (result != SASL_OK) goto done; va_start(ap, fmt); /* start varargs */ while(pos9) done=1; } pos++; if (pos>formatlen) done=1; } } } out[outlen]=0; /* put 0 at end */ va_end(ap); /* send log message */ result = log_cb(log_ctx, level, out); done: if(out) sasl_FREE(out); } /* Allocate and Init a sasl_utils_t structure */ sasl_utils_t * _sasl_alloc_utils(sasl_conn_t *conn, sasl_global_callbacks_t *global_callbacks) { sasl_utils_t *utils; /* set util functions - need to do rest*/ utils=sasl_ALLOC(sizeof(sasl_utils_t)); if (utils==NULL) return NULL; utils->conn = conn; sasl_randcreate(&utils->rpool); if (conn) { utils->getopt = &_sasl_conn_getopt; utils->getopt_context = conn; } else { utils->getopt = &_sasl_global_getopt; utils->getopt_context = global_callbacks; } utils->malloc=_sasl_allocation_utils.malloc; utils->calloc=_sasl_allocation_utils.calloc; utils->realloc=_sasl_allocation_utils.realloc; utils->free=_sasl_allocation_utils.free; utils->mutex_alloc = _sasl_mutex_utils.alloc; utils->mutex_lock = _sasl_mutex_utils.lock; utils->mutex_unlock = _sasl_mutex_utils.unlock; utils->mutex_free = _sasl_mutex_utils.free; utils->MD5Init = &_sasl_MD5Init; utils->MD5Update= &_sasl_MD5Update; utils->MD5Final = &_sasl_MD5Final; utils->hmac_md5 = &_sasl_hmac_md5; utils->hmac_md5_init = &_sasl_hmac_md5_init; utils->hmac_md5_final = &_sasl_hmac_md5_final; utils->hmac_md5_precalc = &_sasl_hmac_md5_precalc; utils->hmac_md5_import = &_sasl_hmac_md5_import; utils->mkchal = &sasl_mkchal; utils->utf8verify = &sasl_utf8verify; utils->rand=&sasl_rand; utils->churn=&sasl_churn; utils->checkpass=NULL; utils->encode64=&sasl_encode64; utils->decode64=&sasl_decode64; utils->erasebuffer=&sasl_erasebuffer; utils->getprop=&sasl_getprop; utils->setprop=&sasl_setprop; utils->getcallback=&_sasl_getcallback; utils->log=&_sasl_log; utils->seterror=&sasl_seterror; #ifndef macintosh /* Aux Property Utilities */ utils->prop_new=&prop_new; utils->prop_dup=&prop_dup; utils->prop_request=&prop_request; utils->prop_get=&prop_get; utils->prop_getnames=&prop_getnames; utils->prop_clear=&prop_clear; utils->prop_dispose=&prop_dispose; utils->prop_format=&prop_format; utils->prop_set=&prop_set; utils->prop_setvals=&prop_setvals; utils->prop_erase=&prop_erase; #endif /* Spares */ utils->spare_fptr = NULL; utils->spare_fptr1 = utils->spare_fptr2 = utils->spare_fptr3 = NULL; return utils; } int _sasl_free_utils(const sasl_utils_t ** utils) { sasl_utils_t *nonconst; if(!utils) return SASL_BADPARAM; if(!*utils) return SASL_OK; /* I wish we could avoid this cast, it's pretty gratuitous but it * does make life easier to have it const everywhere else. */ nonconst = (sasl_utils_t *)(*utils); sasl_randfree(&(nonconst->rpool)); sasl_FREE(nonconst); *utils = NULL; return SASL_OK; } int sasl_idle(sasl_conn_t *conn) { if (! conn) { if (_sasl_server_idle_hook && _sasl_server_idle_hook(NULL)) return 1; if (_sasl_client_idle_hook && _sasl_client_idle_hook(NULL)) return 1; return 0; } if (conn->idle_hook) return conn->idle_hook(conn); return 0; } const sasl_callback_t * _sasl_find_getpath_callback(const sasl_callback_t *callbacks) { static const sasl_callback_t default_getpath_cb = { SASL_CB_GETPATH, &_sasl_getpath, NULL }; if (callbacks) while (callbacks->id != SASL_CB_LIST_END) { if (callbacks->id == SASL_CB_GETPATH) { return callbacks; } else { ++callbacks; } } return &default_getpath_cb; } const sasl_callback_t * _sasl_find_verifyfile_callback(const sasl_callback_t *callbacks) { static const sasl_callback_t default_verifyfile_cb = { SASL_CB_VERIFYFILE, &_sasl_verifyfile, NULL }; if (callbacks) while (callbacks->id != SASL_CB_LIST_END) { if (callbacks->id == SASL_CB_VERIFYFILE) { return callbacks; } else { ++callbacks; } } return &default_verifyfile_cb; } /* Basically a conditional call to realloc(), if we need more */ int _buf_alloc(char **rwbuf, size_t *curlen, size_t newlen) { if(!(*rwbuf)) { *rwbuf = sasl_ALLOC(newlen); if (*rwbuf == NULL) { *curlen = 0; return SASL_NOMEM; } *curlen = newlen; } else if(*rwbuf && *curlen < newlen) { size_t needed = 2*(*curlen); while(needed < newlen) needed *= 2; *rwbuf = sasl_REALLOC(*rwbuf, needed); if (*rwbuf == NULL) { *curlen = 0; return SASL_NOMEM; } *curlen = needed; } return SASL_OK; } /* for the mac os x cfm glue: this lets the calling function get pointers to the error buffer without having to touch the sasl_conn_t struct */ void _sasl_get_errorbuf(sasl_conn_t *conn, char ***bufhdl, unsigned **lenhdl) { *bufhdl = &conn->error_buf; *lenhdl = &conn->error_buf_len; } /* convert an iovec to a single buffer */ int _iovec_to_buf(const struct iovec *vec, unsigned numiov, buffer_info_t **output) { unsigned i; int ret; buffer_info_t *out; char *pos; if(!vec || !output) return SASL_BADPARAM; if(!(*output)) { *output = sasl_ALLOC(sizeof(buffer_info_t)); if(!*output) return SASL_NOMEM; memset(*output,0,sizeof(buffer_info_t)); } out = *output; out->curlen = 0; for(i=0; icurlen += vec[i].iov_len; ret = _buf_alloc(&out->data, (size_t *)&out->reallen, out->curlen); if(ret != SASL_OK) return SASL_NOMEM; memset(out->data, 0, out->reallen); pos = out->data; for(i=0; i= NI_MAXHOST) return SASL_BADPARAM; hbuf[i] = addr[i]; } hbuf[i] = '\0'; if (addr[i] == ';') i++; if (addr[i] != '\0') { port = strtol(&addr[i], &endptr, 10); if (endptr != NULL && *endptr != '\0') return SASL_BADPARAM; } /* getaddrinfo can be expensive, let's check for dotted IP address first */ rc = inet_aton(hbuf,&inetAddr); if (rc==1) { if (out) { struct sockaddr_in * outAddr = (struct sockaddr_in*)out; if (outlen < sizeof(struct sockaddr_in)) return SASL_BADPARAM; memset(out, 0, outlen); outAddr->sin_family = AF_INET; outAddr->sin_port = htons(port); outAddr->sin_addr.s_addr = inetAddr.s_addr; } } else { memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; if (getaddrinfo(hbuf, &addr[i], &hints, &ai) != 0) return SASL_BADPARAM; if (out) { if (outlen < (unsigned)ai->ai_addrlen) { freeaddrinfo(ai); return SASL_BUFOVER; } memcpy(out, ai->ai_addr, ai->ai_addrlen); } freeaddrinfo(ai); } return SASL_OK; } int _sasl_build_mechlist(void) { int count = 0; sasl_string_list_t *clist = NULL, *slist = NULL, *olist = NULL; sasl_string_list_t *p, *q, **last, *p_next; clist = _sasl_client_mechs(); slist = _sasl_server_mechs(); if(!clist) { olist = slist; } else { int flag; /* append slist to clist, and set olist to clist */ for(p = slist; p; p = p_next) { flag = 0; p_next = p->next; last = &clist; for(q = clist; q; q = q->next) { if(!strcmp(q->d, p->d)) { /* They match, set the flag */ flag = 1; break; } last = &(q->next); } if(!flag) { (*last)->next = p; p->next = NULL; } else { sasl_FREE(p); } } olist = clist; } if(!olist) { printf ("no olist"); return SASL_FAIL; } for (p = olist; p; p = p->next) count++; if(global_mech_list) { sasl_FREE(global_mech_list); global_mech_list = NULL; } global_mech_list = sasl_ALLOC((count + 1) * sizeof(char *)); if(!global_mech_list) return SASL_NOMEM; memset(global_mech_list, 0, (count + 1) * sizeof(char *)); count = 0; for (p = olist; p; p = p_next) { p_next = p->next; global_mech_list[count++] = p->d; sasl_FREE(p); } return SASL_OK; } const char ** sasl_global_listmech(void) { return global_mech_list; } int sasl_listmech(sasl_conn_t *conn, const char *user, const char *prefix, const char *sep, const char *suffix, const char **result, unsigned *plen, int *pcount) { if(!conn) { return SASL_BADPARAM; } else if(conn->type == SASL_CONN_SERVER) { RETURN(conn, _sasl_server_listmech(conn, user, prefix, sep, suffix, result, plen, pcount)); } else if (conn->type == SASL_CONN_CLIENT) { RETURN(conn, _sasl_client_listmech(conn, prefix, sep, suffix, result, plen, pcount)); } PARAMERROR(conn); }