/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* This file is for implementing all "generic" SSL functions that all libcurl internals should use. It is then responsible for calling the proper "backend" function. SSL-functions in libcurl should call functions in this source file, and not to any specific SSL-layer. Curl_ssl_ - prefix for generic ones Curl_ossl_ - prefix for OpenSSL ones Curl_gtls_ - prefix for GnuTLS ones Curl_nss_ - prefix for NSS ones Curl_polarssl_ - prefix for PolarSSL ones Curl_cyassl_ - prefix for CyaSSL ones Curl_schannel_ - prefix for Schannel SSPI ones Curl_darwinssl_ - prefix for SecureTransport (Darwin) ones Note that this source code uses curlssl_* functions, and they are all defines/macros #defined by the lib-specific header files. "SSL/TLS Strong Encryption: An Introduction" http://httpd.apache.org/docs-2.0/ssl/ssl_intro.html */ #include "curl_setup.h" #include "curl_urldata.h" #define SSLGEN_C #include "curl_sslgen.h" /* generic SSL protos etc */ #include "curl_ssluse.h" /* OpenSSL versions */ #include "curl_gtls.h" /* GnuTLS versions */ #include "curl_nssg.h" /* NSS versions */ #include "curl_qssl.h" /* QSOSSL versions */ #include "curl_polarssl.h" /* PolarSSL versions */ #include "curl_axtls.h" /* axTLS versions */ #include "curl_cyassl.h" /* CyaSSL versions */ #include "curl_schannel.h" /* Schannel SSPI version */ #include "curl_darwinssl.h" /* SecureTransport (Darwin) version */ #include "curl_sendf.h" #include "curl_rawstr.h" #include "curl_url.h" #include "curl_memory.h" #include "curl_progress.h" #include "curl_share.h" /* The last #include file should be: */ #include "curl_memdebug.h" /* convenience macro to check if this handle is using a shared SSL session */ #define SSLSESSION_SHARED(data) (data->share && \ (data->share->specifier & \ (1<<CURL_LOCK_DATA_SSL_SESSION))) static bool safe_strequal(char* str1, char* str2) { if(str1 && str2) /* both pointers point to something then compare them */ return (0 != Curl_raw_equal(str1, str2)) ? TRUE : FALSE; else /* if both pointers are NULL then treat them as equal */ return (!str1 && !str2) ? TRUE : FALSE; } bool Curl_ssl_config_matches(struct ssl_config_data* data, struct ssl_config_data* needle) { if((data->version == needle->version) && (data->verifypeer == needle->verifypeer) && (data->verifyhost == needle->verifyhost) && safe_strequal(data->CApath, needle->CApath) && safe_strequal(data->CAfile, needle->CAfile) && safe_strequal(data->random_file, needle->random_file) && safe_strequal(data->egdsocket, needle->egdsocket) && safe_strequal(data->cipher_list, needle->cipher_list)) return TRUE; return FALSE; } bool Curl_clone_ssl_config(struct ssl_config_data *source, struct ssl_config_data *dest) { dest->sessionid = source->sessionid; dest->verifyhost = source->verifyhost; dest->verifypeer = source->verifypeer; dest->version = source->version; if(source->CAfile) { dest->CAfile = strdup(source->CAfile); if(!dest->CAfile) return FALSE; } else dest->CAfile = NULL; if(source->CApath) { dest->CApath = strdup(source->CApath); if(!dest->CApath) return FALSE; } else dest->CApath = NULL; if(source->cipher_list) { dest->cipher_list = strdup(source->cipher_list); if(!dest->cipher_list) return FALSE; } else dest->cipher_list = NULL; if(source->egdsocket) { dest->egdsocket = strdup(source->egdsocket); if(!dest->egdsocket) return FALSE; } else dest->egdsocket = NULL; if(source->random_file) { dest->random_file = strdup(source->random_file); if(!dest->random_file) return FALSE; } else dest->random_file = NULL; return TRUE; } void Curl_free_ssl_config(struct ssl_config_data* sslc) { Curl_safefree(sslc->CAfile); Curl_safefree(sslc->CApath); Curl_safefree(sslc->cipher_list); Curl_safefree(sslc->egdsocket); Curl_safefree(sslc->random_file); } #ifdef USE_SSL /* "global" init done? */ static bool init_ssl=FALSE; /** * Global SSL init * * @retval 0 error initializing SSL * @retval 1 SSL initialized successfully */ int Curl_ssl_init(void) { /* make sure this is only done once */ if(init_ssl) return 1; init_ssl = TRUE; /* never again */ return curlssl_init(); } /* Global cleanup */ void Curl_ssl_cleanup(void) { if(init_ssl) { /* only cleanup if we did a previous init */ curlssl_cleanup(); init_ssl = FALSE; } } CURLcode Curl_ssl_connect(struct connectdata *conn, int sockindex) { CURLcode res; /* mark this is being ssl-enabled from here on. */ conn->ssl[sockindex].use = TRUE; conn->ssl[sockindex].state = ssl_connection_negotiating; res = curlssl_connect(conn, sockindex); if(!res) Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */ return res; } CURLcode Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex, bool *done) { CURLcode res; /* mark this is being ssl requested from here on. */ conn->ssl[sockindex].use = TRUE; #ifdef curlssl_connect_nonblocking res = curlssl_connect_nonblocking(conn, sockindex, done); #else *done = TRUE; /* fallback to BLOCKING */ res = curlssl_connect(conn, sockindex); #endif /* non-blocking connect support */ if(!res && *done) Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */ return res; } /* * Check if there's a session ID for the given connection in the cache, and if * there's one suitable, it is provided. Returns TRUE when no entry matched. */ int Curl_ssl_getsessionid(struct connectdata *conn, void **ssl_sessionid, size_t *idsize) /* set 0 if unknown */ { struct curl_ssl_session *check; struct SessionHandle *data = conn->data; size_t i; long *general_age; bool no_match = TRUE; *ssl_sessionid = NULL; if(!conn->ssl_config.sessionid) /* session ID re-use is disabled */ return TRUE; /* Lock if shared */ if(SSLSESSION_SHARED(data)) { Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE); general_age = &data->share->sessionage; } else general_age = &data->state.sessionage; for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) { check = &data->state.session[i]; if(!check->sessionid) /* not session ID means blank entry */ continue; if(Curl_raw_equal(conn->host.name, check->name) && (conn->remote_port == check->remote_port) && Curl_ssl_config_matches(&conn->ssl_config, &check->ssl_config)) { /* yes, we have a session ID! */ (*general_age)++; /* increase general age */ check->age = *general_age; /* set this as used in this age */ *ssl_sessionid = check->sessionid; if(idsize) *idsize = check->idsize; no_match = FALSE; break; } } /* Unlock */ if(SSLSESSION_SHARED(data)) Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION); return no_match; } /* * Kill a single session ID entry in the cache. */ void Curl_ssl_kill_session(struct curl_ssl_session *session) { if(session->sessionid) { /* defensive check */ /* free the ID the SSL-layer specific way */ curlssl_session_free(session->sessionid); session->sessionid = NULL; session->age = 0; /* fresh */ Curl_free_ssl_config(&session->ssl_config); Curl_safefree(session->name); } } /* * Delete the given session ID from the cache. */ void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid) { size_t i; struct SessionHandle *data=conn->data; if(SSLSESSION_SHARED(data)) Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE); for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) { struct curl_ssl_session *check = &data->state.session[i]; if(check->sessionid == ssl_sessionid) { Curl_ssl_kill_session(check); break; } } if(SSLSESSION_SHARED(data)) Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION); } /* * Store session id in the session cache. The ID passed on to this function * must already have been extracted and allocated the proper way for the SSL * layer. Curl_XXXX_session_free() will be called to free/kill the session ID * later on. */ CURLcode Curl_ssl_addsessionid(struct connectdata *conn, void *ssl_sessionid, size_t idsize) { size_t i; struct SessionHandle *data=conn->data; /* the mother of all structs */ struct curl_ssl_session *store = &data->state.session[0]; long oldest_age=data->state.session[0].age; /* zero if unused */ char *clone_host; long *general_age; /* Even though session ID re-use might be disabled, that only disables USING IT. We still store it here in case the re-using is again enabled for an upcoming transfer */ clone_host = strdup(conn->host.name); if(!clone_host) return CURLE_OUT_OF_MEMORY; /* bail out */ /* Now we should add the session ID and the host name to the cache, (remove the oldest if necessary) */ /* If using shared SSL session, lock! */ if(SSLSESSION_SHARED(data)) { Curl_share_lock(data, CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE); general_age = &data->share->sessionage; } else { general_age = &data->state.sessionage; } /* find an empty slot for us, or find the oldest */ for(i = 1; (i < data->set.ssl.max_ssl_sessions) && data->state.session[i].sessionid; i++) { if(data->state.session[i].age < oldest_age) { oldest_age = data->state.session[i].age; store = &data->state.session[i]; } } if(i == data->set.ssl.max_ssl_sessions) /* cache is full, we must "kill" the oldest entry! */ Curl_ssl_kill_session(store); else store = &data->state.session[i]; /* use this slot */ /* now init the session struct wisely */ store->sessionid = ssl_sessionid; store->idsize = idsize; store->age = *general_age; /* set current age */ if(store->name) /* free it if there's one already present */ free(store->name); store->name = clone_host; /* clone host name */ store->remote_port = conn->remote_port; /* port number */ /* Unlock */ if(SSLSESSION_SHARED(data)) Curl_share_unlock(data, CURL_LOCK_DATA_SSL_SESSION); if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config)) { store->sessionid = NULL; /* let caller free sessionid */ free(clone_host); return CURLE_OUT_OF_MEMORY; } return CURLE_OK; } void Curl_ssl_close_all(struct SessionHandle *data) { size_t i; /* kill the session ID cache if not shared */ if(data->state.session && !SSLSESSION_SHARED(data)) { for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) /* the single-killer function handles empty table slots */ Curl_ssl_kill_session(&data->state.session[i]); /* free the cache data */ Curl_safefree(data->state.session); } curlssl_close_all(data); } void Curl_ssl_close(struct connectdata *conn, int sockindex) { DEBUGASSERT((sockindex <= 1) && (sockindex >= -1)); curlssl_close(conn, sockindex); } CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex) { if(curlssl_shutdown(conn, sockindex)) return CURLE_SSL_SHUTDOWN_FAILED; conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */ conn->ssl[sockindex].state = ssl_connection_none; conn->recv[sockindex] = Curl_recv_plain; conn->send[sockindex] = Curl_send_plain; return CURLE_OK; } /* Selects an SSL crypto engine */ CURLcode Curl_ssl_set_engine(struct SessionHandle *data, const char *engine) { return curlssl_set_engine(data, engine); } /* Selects the default SSL crypto engine */ CURLcode Curl_ssl_set_engine_default(struct SessionHandle *data) { return curlssl_set_engine_default(data); } /* Return list of OpenSSL crypto engine names. */ struct curl_slist *Curl_ssl_engines_list(struct SessionHandle *data) { return curlssl_engines_list(data); } /* * This sets up a session ID cache to the specified size. Make sure this code * is agnostic to what underlying SSL technology we use. */ CURLcode Curl_ssl_initsessions(struct SessionHandle *data, size_t amount) { struct curl_ssl_session *session; if(data->state.session) /* this is just a precaution to prevent multiple inits */ return CURLE_OK; session = calloc(amount, sizeof(struct curl_ssl_session)); if(!session) return CURLE_OUT_OF_MEMORY; /* store the info in the SSL section */ data->set.ssl.max_ssl_sessions = amount; data->state.session = session; data->state.sessionage = 1; /* this is brand new */ return CURLE_OK; } size_t Curl_ssl_version(char *buffer, size_t size) { return curlssl_version(buffer, size); } /* * This function tries to determine connection status. * * Return codes: * 1 means the connection is still in place * 0 means the connection has been closed * -1 means the connection status is unknown */ int Curl_ssl_check_cxn(struct connectdata *conn) { return curlssl_check_cxn(conn); } bool Curl_ssl_data_pending(const struct connectdata *conn, int connindex) { return curlssl_data_pending(conn, connindex); } void Curl_ssl_free_certinfo(struct SessionHandle *data) { int i; struct curl_certinfo *ci = &data->info.certs; if(ci->num_of_certs) { /* free all individual lists used */ for(i=0; i<ci->num_of_certs; i++) { curl_slist_free_all(ci->certinfo[i]); ci->certinfo[i] = NULL; } free(ci->certinfo); /* free the actual array too */ ci->certinfo = NULL; ci->num_of_certs = 0; } } #if defined(USE_SSLEAY) || defined(USE_GNUTLS) || defined(USE_NSS) || \ defined(USE_DARWINSSL) /* these functions are only used by some SSL backends */ void Curl_ssl_random(struct SessionHandle *data, unsigned char *entropy, size_t length) { curlssl_random(data, entropy, length); } void Curl_ssl_md5sum(unsigned char *tmp, /* input */ size_t tmplen, unsigned char *md5sum, /* output */ size_t md5len) { curlssl_md5sum(tmp, tmplen, md5sum, md5len); } #endif /* USE_SSLEAY || USE_GNUTLS || USE_NSS || USE_DARWINSSL */ #endif /* USE_SSL */