diff options
Diffstat (limited to 'Utilities/cmcurl/lib/vtls/vtls.c')
| -rw-r--r-- | Utilities/cmcurl/lib/vtls/vtls.c | 1329 |
1 files changed, 1329 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/vtls/vtls.c b/Utilities/cmcurl/lib/vtls/vtls.c new file mode 100644 index 0000000000..def1d30cb6 --- /dev/null +++ b/Utilities/cmcurl/lib/vtls/vtls.c @@ -0,0 +1,1329 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2017, 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 https://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 + + Note that this source code uses the functions of the configured SSL + backend via the global Curl_ssl instance. + + "SSL/TLS Strong Encryption: An Introduction" + https://httpd.apache.org/docs/2.0/ssl/ssl_intro.html +*/ + +#include "curl_setup.h" + +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif +#ifdef HAVE_FCNTL_H +#include <fcntl.h> +#endif + +#include "urldata.h" + +#include "vtls.h" /* generic SSL protos etc */ +#include "slist.h" +#include "sendf.h" +#include "strcase.h" +#include "url.h" +#include "progress.h" +#include "share.h" +#include "multiif.h" +#include "timeval.h" +#include "curl_md5.h" +#include "warnless.h" +#include "curl_base64.h" +#include "curl_printf.h" + +/* The last #include files should be: */ +#include "curl_memory.h" +#include "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))) + +#define CLONE_STRING(var) \ + if(source->var) { \ + dest->var = strdup(source->var); \ + if(!dest->var) \ + return FALSE; \ + } \ + else \ + dest->var = NULL; + +bool +Curl_ssl_config_matches(struct ssl_primary_config* data, + struct ssl_primary_config* needle) +{ + if((data->version == needle->version) && + (data->version_max == needle->version_max) && + (data->verifypeer == needle->verifypeer) && + (data->verifyhost == needle->verifyhost) && + (data->verifystatus == needle->verifystatus) && + Curl_safe_strcasecompare(data->CApath, needle->CApath) && + Curl_safe_strcasecompare(data->CAfile, needle->CAfile) && + Curl_safe_strcasecompare(data->clientcert, needle->clientcert) && + Curl_safe_strcasecompare(data->random_file, needle->random_file) && + Curl_safe_strcasecompare(data->egdsocket, needle->egdsocket) && + Curl_safe_strcasecompare(data->cipher_list, needle->cipher_list)) + return TRUE; + + return FALSE; +} + +bool +Curl_clone_primary_ssl_config(struct ssl_primary_config *source, + struct ssl_primary_config *dest) +{ + dest->version = source->version; + dest->version_max = source->version_max; + dest->verifypeer = source->verifypeer; + dest->verifyhost = source->verifyhost; + dest->verifystatus = source->verifystatus; + dest->sessionid = source->sessionid; + + CLONE_STRING(CApath); + CLONE_STRING(CAfile); + CLONE_STRING(clientcert); + CLONE_STRING(random_file); + CLONE_STRING(egdsocket); + CLONE_STRING(cipher_list); + + return TRUE; +} + +void Curl_free_primary_ssl_config(struct ssl_primary_config* sslc) +{ + Curl_safefree(sslc->CApath); + Curl_safefree(sslc->CAfile); + Curl_safefree(sslc->clientcert); + Curl_safefree(sslc->random_file); + Curl_safefree(sslc->egdsocket); + Curl_safefree(sslc->cipher_list); +} + +#ifdef USE_SSL +static int multissl_init(const struct Curl_ssl *backend); +#endif + +int Curl_ssl_backend(void) +{ +#ifdef USE_SSL + multissl_init(NULL); + return Curl_ssl->info.id; +#else + return (int)CURLSSLBACKEND_NONE; +#endif +} + +#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 Curl_ssl->init(); +} + + +/* Global cleanup */ +void Curl_ssl_cleanup(void) +{ + if(init_ssl) { + /* only cleanup if we did a previous init */ + Curl_ssl->cleanup(); + init_ssl = FALSE; + } +} + +static bool ssl_prefs_check(struct Curl_easy *data) +{ + /* check for CURLOPT_SSLVERSION invalid parameter value */ + const long sslver = data->set.ssl.primary.version; + if((sslver < 0) || (sslver >= CURL_SSLVERSION_LAST)) { + failf(data, "Unrecognized parameter value passed via CURLOPT_SSLVERSION"); + return FALSE; + } + + switch(data->set.ssl.primary.version_max) { + case CURL_SSLVERSION_MAX_NONE: + case CURL_SSLVERSION_MAX_DEFAULT: + break; + + default: + if((data->set.ssl.primary.version_max >> 16) < sslver) { + failf(data, "CURL_SSLVERSION_MAX incompatible with CURL_SSLVERSION"); + return FALSE; + } + } + + return TRUE; +} + +static CURLcode +ssl_connect_init_proxy(struct connectdata *conn, int sockindex) +{ + DEBUGASSERT(conn->bits.proxy_ssl_connected[sockindex]); + if(ssl_connection_complete == conn->ssl[sockindex].state && + !conn->proxy_ssl[sockindex].use) { + struct ssl_backend_data *pbdata; + + if(!Curl_ssl->support_https_proxy) + return CURLE_NOT_BUILT_IN; + + /* The pointers to the ssl backend data, which is opaque here, are swapped + rather than move the contents. */ + pbdata = conn->proxy_ssl[sockindex].backend; + conn->proxy_ssl[sockindex] = conn->ssl[sockindex]; + + memset(&conn->ssl[sockindex], 0, sizeof(conn->ssl[sockindex])); + memset(pbdata, 0, Curl_ssl->sizeof_ssl_backend_data); + + conn->ssl[sockindex].backend = pbdata; + } + return CURLE_OK; +} + +CURLcode +Curl_ssl_connect(struct connectdata *conn, int sockindex) +{ + CURLcode result; + + if(conn->bits.proxy_ssl_connected[sockindex]) { + result = ssl_connect_init_proxy(conn, sockindex); + if(result) + return result; + } + + if(!ssl_prefs_check(conn->data)) + return CURLE_SSL_CONNECT_ERROR; + + /* mark this is being ssl-enabled from here on. */ + conn->ssl[sockindex].use = TRUE; + conn->ssl[sockindex].state = ssl_connection_negotiating; + + result = Curl_ssl->connect(conn, sockindex); + + if(!result) + Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */ + + return result; +} + +CURLcode +Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex, + bool *done) +{ + CURLcode result; + if(conn->bits.proxy_ssl_connected[sockindex]) { + result = ssl_connect_init_proxy(conn, sockindex); + if(result) + return result; + } + + if(!ssl_prefs_check(conn->data)) + return CURLE_SSL_CONNECT_ERROR; + + /* mark this is being ssl requested from here on. */ + conn->ssl[sockindex].use = TRUE; + result = Curl_ssl->connect_nonblocking(conn, sockindex, done); + if(!result && *done) + Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */ + return result; +} + +/* + * Lock shared SSL session data + */ +void Curl_ssl_sessionid_lock(struct connectdata *conn) +{ + if(SSLSESSION_SHARED(conn->data)) + Curl_share_lock(conn->data, + CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE); +} + +/* + * Unlock shared SSL session data + */ +void Curl_ssl_sessionid_unlock(struct connectdata *conn) +{ + if(SSLSESSION_SHARED(conn->data)) + Curl_share_unlock(conn->data, CURL_LOCK_DATA_SSL_SESSION); +} + +/* + * 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. + */ +bool Curl_ssl_getsessionid(struct connectdata *conn, + void **ssl_sessionid, + size_t *idsize, /* set 0 if unknown */ + int sockindex) +{ + struct curl_ssl_session *check; + struct Curl_easy *data = conn->data; + size_t i; + long *general_age; + bool no_match = TRUE; + + const bool isProxy = CONNECT_PROXY_SSL(); + struct ssl_primary_config * const ssl_config = isProxy ? + &conn->proxy_ssl_config : + &conn->ssl_config; + const char * const name = isProxy ? conn->http_proxy.host.name : + conn->host.name; + int port = isProxy ? (int)conn->port : conn->remote_port; + *ssl_sessionid = NULL; + + DEBUGASSERT(SSL_SET_OPTION(primary.sessionid)); + + if(!SSL_SET_OPTION(primary.sessionid)) + /* session ID re-use is disabled */ + return TRUE; + + /* Lock if shared */ + if(SSLSESSION_SHARED(data)) + general_age = &data->share->sessionage; + else + general_age = &data->state.sessionage; + + for(i = 0; i < data->set.general_ssl.max_ssl_sessions; i++) { + check = &data->state.session[i]; + if(!check->sessionid) + /* not session ID means blank entry */ + continue; + if(strcasecompare(name, check->name) && + ((!conn->bits.conn_to_host && !check->conn_to_host) || + (conn->bits.conn_to_host && check->conn_to_host && + strcasecompare(conn->conn_to_host.name, check->conn_to_host))) && + ((!conn->bits.conn_to_port && check->conn_to_port == -1) || + (conn->bits.conn_to_port && check->conn_to_port != -1 && + conn->conn_to_port == check->conn_to_port)) && + (port == check->remote_port) && + strcasecompare(conn->handler->scheme, check->scheme) && + Curl_ssl_config_matches(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; + } + } + + 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 */ + Curl_ssl->session_free(session->sessionid); + + session->sessionid = NULL; + session->age = 0; /* fresh */ + + Curl_free_primary_ssl_config(&session->ssl_config); + + Curl_safefree(session->name); + Curl_safefree(session->conn_to_host); + } +} + +/* + * Delete the given session ID from the cache. + */ +void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid) +{ + size_t i; + struct Curl_easy *data = conn->data; + + for(i = 0; i < data->set.general_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; + } + } +} + +/* + * 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, + int sockindex) +{ + size_t i; + struct Curl_easy *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; + char *clone_conn_to_host; + int conn_to_port; + long *general_age; + const bool isProxy = CONNECT_PROXY_SSL(); + struct ssl_primary_config * const ssl_config = isProxy ? + &conn->proxy_ssl_config : + &conn->ssl_config; + + DEBUGASSERT(SSL_SET_OPTION(primary.sessionid)); + + clone_host = strdup(isProxy ? conn->http_proxy.host.name : conn->host.name); + if(!clone_host) + return CURLE_OUT_OF_MEMORY; /* bail out */ + + if(conn->bits.conn_to_host) { + clone_conn_to_host = strdup(conn->conn_to_host.name); + if(!clone_conn_to_host) { + free(clone_host); + return CURLE_OUT_OF_MEMORY; /* bail out */ + } + } + else + clone_conn_to_host = NULL; + + if(conn->bits.conn_to_port) + conn_to_port = conn->conn_to_port; + else + conn_to_port = -1; + + /* 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)) { + 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.general_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.general_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 */ + /* free it if there's one already present */ + free(store->name); + free(store->conn_to_host); + store->name = clone_host; /* clone host name */ + store->conn_to_host = clone_conn_to_host; /* clone connect to host name */ + store->conn_to_port = conn_to_port; /* connect to port number */ + /* port number */ + store->remote_port = isProxy ? (int)conn->port : conn->remote_port; + store->scheme = conn->handler->scheme; + + if(!Curl_clone_primary_ssl_config(ssl_config, &store->ssl_config)) { + store->sessionid = NULL; /* let caller free sessionid */ + free(clone_host); + free(clone_conn_to_host); + return CURLE_OUT_OF_MEMORY; + } + + return CURLE_OK; +} + + +void Curl_ssl_close_all(struct Curl_easy *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.general_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); + } + + Curl_ssl->close_all(data); +} + +#if defined(USE_OPENSSL) || defined(USE_GNUTLS) || defined(USE_SCHANNEL) || \ + defined(USE_DARWINSSL) || defined(USE_POLARSSL) || defined(USE_NSS) || \ + defined(USE_MBEDTLS) +int Curl_ssl_getsock(struct connectdata *conn, curl_socket_t *socks, + int numsocks) +{ + struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET]; + + if(!numsocks) + return GETSOCK_BLANK; + + if(connssl->connecting_state == ssl_connect_2_writing) { + /* write mode */ + socks[0] = conn->sock[FIRSTSOCKET]; + return GETSOCK_WRITESOCK(0); + } + if(connssl->connecting_state == ssl_connect_2_reading) { + /* read mode */ + socks[0] = conn->sock[FIRSTSOCKET]; + return GETSOCK_READSOCK(0); + } + + return GETSOCK_BLANK; +} +#else +int Curl_ssl_getsock(struct connectdata *conn, + curl_socket_t *socks, + int numsocks) +{ + (void)conn; + (void)socks; + (void)numsocks; + return GETSOCK_BLANK; +} +/* USE_OPENSSL || USE_GNUTLS || USE_SCHANNEL || USE_DARWINSSL || USE_NSS */ +#endif + +void Curl_ssl_close(struct connectdata *conn, int sockindex) +{ + DEBUGASSERT((sockindex <= 1) && (sockindex >= -1)); + Curl_ssl->close_one(conn, sockindex); +} + +CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex) +{ + if(Curl_ssl->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 Curl_easy *data, const char *engine) +{ + return Curl_ssl->set_engine(data, engine); +} + +/* Selects the default SSL crypto engine + */ +CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data) +{ + return Curl_ssl->set_engine_default(data); +} + +/* Return list of OpenSSL crypto engine names. */ +struct curl_slist *Curl_ssl_engines_list(struct Curl_easy *data) +{ + return Curl_ssl->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 Curl_easy *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.general_ssl.max_ssl_sessions = amount; + data->state.session = session; + data->state.sessionage = 1; /* this is brand new */ + return CURLE_OK; +} + +static size_t Curl_multissl_version(char *buffer, size_t size); + +size_t Curl_ssl_version(char *buffer, size_t size) +{ +#ifdef CURL_WITH_MULTI_SSL + return Curl_multissl_version(buffer, size); +#else + return Curl_ssl->version(buffer, size); +#endif +} + +/* + * 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 Curl_ssl->check_cxn(conn); +} + +bool Curl_ssl_data_pending(const struct connectdata *conn, + int connindex) +{ + return Curl_ssl->data_pending(conn, connindex); +} + +void Curl_ssl_free_certinfo(struct Curl_easy *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; + } +} + +CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num) +{ + struct curl_certinfo *ci = &data->info.certs; + struct curl_slist **table; + + /* Free any previous certificate information structures */ + Curl_ssl_free_certinfo(data); + + /* Allocate the required certificate information structures */ + table = calloc((size_t) num, sizeof(struct curl_slist *)); + if(!table) + return CURLE_OUT_OF_MEMORY; + + ci->num_of_certs = num; + ci->certinfo = table; + + return CURLE_OK; +} + +/* + * 'value' is NOT a zero terminated string + */ +CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data, + int certnum, + const char *label, + const char *value, + size_t valuelen) +{ + struct curl_certinfo *ci = &data->info.certs; + char *output; + struct curl_slist *nl; + CURLcode result = CURLE_OK; + size_t labellen = strlen(label); + size_t outlen = labellen + 1 + valuelen + 1; /* label:value\0 */ + + output = malloc(outlen); + if(!output) + return CURLE_OUT_OF_MEMORY; + + /* sprintf the label and colon */ + snprintf(output, outlen, "%s:", label); + + /* memcpy the value (it might not be zero terminated) */ + memcpy(&output[labellen + 1], value, valuelen); + + /* zero terminate the output */ + output[labellen + 1 + valuelen] = 0; + + nl = Curl_slist_append_nodup(ci->certinfo[certnum], output); + if(!nl) { + free(output); + curl_slist_free_all(ci->certinfo[certnum]); + result = CURLE_OUT_OF_MEMORY; + } + + ci->certinfo[certnum] = nl; + return result; +} + +/* + * This is a convenience function for push_certinfo_len that takes a zero + * terminated value. + */ +CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data, + int certnum, + const char *label, + const char *value) +{ + size_t valuelen = strlen(value); + + return Curl_ssl_push_certinfo_len(data, certnum, label, value, valuelen); +} + +CURLcode Curl_ssl_random(struct Curl_easy *data, + unsigned char *entropy, + size_t length) +{ + return Curl_ssl->random(data, entropy, length); +} + +/* + * Public key pem to der conversion + */ + +static CURLcode pubkey_pem_to_der(const char *pem, + unsigned char **der, size_t *der_len) +{ + char *stripped_pem, *begin_pos, *end_pos; + size_t pem_count, stripped_pem_count = 0, pem_len; + CURLcode result; + + /* if no pem, exit. */ + if(!pem) + return CURLE_BAD_CONTENT_ENCODING; + + begin_pos = strstr(pem, "-----BEGIN PUBLIC KEY-----"); + if(!begin_pos) + return CURLE_BAD_CONTENT_ENCODING; + + pem_count = begin_pos - pem; + /* Invalid if not at beginning AND not directly following \n */ + if(0 != pem_count && '\n' != pem[pem_count - 1]) + return CURLE_BAD_CONTENT_ENCODING; + + /* 26 is length of "-----BEGIN PUBLIC KEY-----" */ + pem_count += 26; + + /* Invalid if not directly following \n */ + end_pos = strstr(pem + pem_count, "\n-----END PUBLIC KEY-----"); + if(!end_pos) + return CURLE_BAD_CONTENT_ENCODING; + + pem_len = end_pos - pem; + + stripped_pem = malloc(pem_len - pem_count + 1); + if(!stripped_pem) + return CURLE_OUT_OF_MEMORY; + + /* + * Here we loop through the pem array one character at a time between the + * correct indices, and place each character that is not '\n' or '\r' + * into the stripped_pem array, which should represent the raw base64 string + */ + while(pem_count < pem_len) { + if('\n' != pem[pem_count] && '\r' != pem[pem_count]) + stripped_pem[stripped_pem_count++] = pem[pem_count]; + ++pem_count; + } + /* Place the null terminator in the correct place */ + stripped_pem[stripped_pem_count] = '\0'; + + result = Curl_base64_decode(stripped_pem, der, der_len); + + Curl_safefree(stripped_pem); + + return result; +} + +/* + * Generic pinned public key check. + */ + +CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data, + const char *pinnedpubkey, + const unsigned char *pubkey, size_t pubkeylen) +{ + FILE *fp; + unsigned char *buf = NULL, *pem_ptr = NULL; + long filesize; + size_t size, pem_len; + CURLcode pem_read; + CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH; + CURLcode encode; + size_t encodedlen, pinkeylen; + char *encoded, *pinkeycopy, *begin_pos, *end_pos; + unsigned char *sha256sumdigest = NULL; + + /* if a path wasn't specified, don't pin */ + if(!pinnedpubkey) + return CURLE_OK; + if(!pubkey || !pubkeylen) + return result; + + /* only do this if pinnedpubkey starts with "sha256//", length 8 */ + if(strncmp(pinnedpubkey, "sha256//", 8) == 0) { + if(!Curl_ssl->sha256sum) { + /* without sha256 support, this cannot match */ + return result; + } + + /* compute sha256sum of public key */ + sha256sumdigest = malloc(CURL_SHA256_DIGEST_LENGTH); + if(!sha256sumdigest) + return CURLE_OUT_OF_MEMORY; + Curl_ssl->sha256sum(pubkey, pubkeylen, + sha256sumdigest, CURL_SHA256_DIGEST_LENGTH); + encode = Curl_base64_encode(data, (char *)sha256sumdigest, + CURL_SHA256_DIGEST_LENGTH, &encoded, + &encodedlen); + Curl_safefree(sha256sumdigest); + + if(encode) + return encode; + + infof(data, "\t public key hash: sha256//%s\n", encoded); + + /* it starts with sha256//, copy so we can modify it */ + pinkeylen = strlen(pinnedpubkey) + 1; + pinkeycopy = malloc(pinkeylen); + if(!pinkeycopy) { + Curl_safefree(encoded); + return CURLE_OUT_OF_MEMORY; + } + memcpy(pinkeycopy, pinnedpubkey, pinkeylen); + /* point begin_pos to the copy, and start extracting keys */ + begin_pos = pinkeycopy; + do { + end_pos = strstr(begin_pos, ";sha256//"); + /* + * if there is an end_pos, null terminate, + * otherwise it'll go to the end of the original string + */ + if(end_pos) + end_pos[0] = '\0'; + + /* compare base64 sha256 digests, 8 is the length of "sha256//" */ + if(encodedlen == strlen(begin_pos + 8) && + !memcmp(encoded, begin_pos + 8, encodedlen)) { + result = CURLE_OK; + break; + } + + /* + * change back the null-terminator we changed earlier, + * and look for next begin + */ + if(end_pos) { + end_pos[0] = ';'; + begin_pos = strstr(end_pos, "sha256//"); + } + } while(end_pos && begin_pos); + Curl_safefree(encoded); + Curl_safefree(pinkeycopy); + return result; + } + + fp = fopen(pinnedpubkey, "rb"); + if(!fp) + return result; + + do { + /* Determine the file's size */ + if(fseek(fp, 0, SEEK_END)) + break; + filesize = ftell(fp); + if(fseek(fp, 0, SEEK_SET)) + break; + if(filesize < 0 || filesize > MAX_PINNED_PUBKEY_SIZE) + break; + + /* + * if the size of our certificate is bigger than the file + * size then it can't match + */ + size = curlx_sotouz((curl_off_t) filesize); + if(pubkeylen > size) + break; + + /* + * Allocate buffer for the pinned key + * With 1 additional byte for null terminator in case of PEM key + */ + buf = malloc(size + 1); + if(!buf) + break; + + /* Returns number of elements read, which should be 1 */ + if((int) fread(buf, size, 1, fp) != 1) + break; + + /* If the sizes are the same, it can't be base64 encoded, must be der */ + if(pubkeylen == size) { + if(!memcmp(pubkey, buf, pubkeylen)) + result = CURLE_OK; + break; + } + + /* + * Otherwise we will assume it's PEM and try to decode it + * after placing null terminator + */ + buf[size] = '\0'; + pem_read = pubkey_pem_to_der((const char *)buf, &pem_ptr, &pem_len); + /* if it wasn't read successfully, exit */ + if(pem_read) + break; + + /* + * if the size of our certificate doesn't match the size of + * the decoded file, they can't be the same, otherwise compare + */ + if(pubkeylen == pem_len && !memcmp(pubkey, pem_ptr, pubkeylen)) + result = CURLE_OK; + } while(0); + + Curl_safefree(buf); + Curl_safefree(pem_ptr); + fclose(fp); + + return result; +} + +#ifndef CURL_DISABLE_CRYPTO_AUTH +CURLcode Curl_ssl_md5sum(unsigned char *tmp, /* input */ + size_t tmplen, + unsigned char *md5sum, /* output */ + size_t md5len) +{ + return Curl_ssl->md5sum(tmp, tmplen, md5sum, md5len); +} +#endif + +/* + * Check whether the SSL backend supports the status_request extension. + */ +bool Curl_ssl_cert_status_request(void) +{ + return Curl_ssl->cert_status_request(); +} + +/* + * Check whether the SSL backend supports false start. + */ +bool Curl_ssl_false_start(void) +{ + return Curl_ssl->false_start(); +} + +/* + * Default implementations for unsupported functions. + */ + +int Curl_none_init(void) +{ + return 1; +} + +void Curl_none_cleanup(void) +{ } + +int Curl_none_shutdown(struct connectdata *conn UNUSED_PARAM, + int sockindex UNUSED_PARAM) +{ + (void)conn; + (void)sockindex; + return 0; +} + +int Curl_none_check_cxn(struct connectdata *conn UNUSED_PARAM) +{ + (void)conn; + return -1; +} + +CURLcode Curl_none_random(struct Curl_easy *data UNUSED_PARAM, + unsigned char *entropy UNUSED_PARAM, + size_t length UNUSED_PARAM) +{ + (void)data; + (void)entropy; + (void)length; + return CURLE_NOT_BUILT_IN; +} + +void Curl_none_close_all(struct Curl_easy *data UNUSED_PARAM) +{ + (void)data; +} + +void Curl_none_session_free(void *ptr UNUSED_PARAM) +{ + (void)ptr; +} + +bool Curl_none_data_pending(const struct connectdata *conn UNUSED_PARAM, + int connindex UNUSED_PARAM) +{ + (void)conn; + (void)connindex; + return 0; +} + +bool Curl_none_cert_status_request(void) +{ + return FALSE; +} + +CURLcode Curl_none_set_engine(struct Curl_easy *data UNUSED_PARAM, + const char *engine UNUSED_PARAM) +{ + (void)data; + (void)engine; + return CURLE_NOT_BUILT_IN; +} + +CURLcode Curl_none_set_engine_default(struct Curl_easy *data UNUSED_PARAM) +{ + (void)data; + return CURLE_NOT_BUILT_IN; +} + +struct curl_slist *Curl_none_engines_list(struct Curl_easy *data UNUSED_PARAM) +{ + (void)data; + return (struct curl_slist *)NULL; +} + +bool Curl_none_false_start(void) +{ + return FALSE; +} + +#ifndef CURL_DISABLE_CRYPTO_AUTH +CURLcode Curl_none_md5sum(unsigned char *input, size_t inputlen, + unsigned char *md5sum, size_t md5len UNUSED_PARAM) +{ + MD5_context *MD5pw; + + (void)md5len; + + MD5pw = Curl_MD5_init(Curl_DIGEST_MD5); + if(!MD5pw) + return CURLE_OUT_OF_MEMORY; + Curl_MD5_update(MD5pw, input, curlx_uztoui(inputlen)); + Curl_MD5_final(MD5pw, md5sum); + return CURLE_OK; +} +#else +CURLcode Curl_none_md5sum(unsigned char *input UNUSED_PARAM, + size_t inputlen UNUSED_PARAM, + unsigned char *md5sum UNUSED_PARAM, + size_t md5len UNUSED_PARAM) +{ + (void)input; + (void)inputlen; + (void)md5sum; + (void)md5len; + return CURLE_NOT_BUILT_IN; +} +#endif + +static int Curl_multissl_init(void) +{ + if(multissl_init(NULL)) + return 1; + return Curl_ssl->init(); +} + +static CURLcode Curl_multissl_connect(struct connectdata *conn, int sockindex) +{ + if(multissl_init(NULL)) + return CURLE_FAILED_INIT; + return Curl_ssl->connect(conn, sockindex); +} + +static CURLcode Curl_multissl_connect_nonblocking(struct connectdata *conn, + int sockindex, bool *done) +{ + if(multissl_init(NULL)) + return CURLE_FAILED_INIT; + return Curl_ssl->connect_nonblocking(conn, sockindex, done); +} + +static void *Curl_multissl_get_internals(struct ssl_connect_data *connssl, + CURLINFO info) +{ + if(multissl_init(NULL)) + return NULL; + return Curl_ssl->get_internals(connssl, info); +} + +static void Curl_multissl_close(struct connectdata *conn, int sockindex) +{ + if(multissl_init(NULL)) + return; + Curl_ssl->close_one(conn, sockindex); +} + +static const struct Curl_ssl Curl_ssl_multi = { + { CURLSSLBACKEND_NONE, "multi" }, /* info */ + + 0, /* have_ca_path */ + 0, /* have_certinfo */ + 0, /* have_pinnedpubkey */ + 0, /* have_ssl_ctx */ + 0, /* support_https_proxy */ + + (size_t)-1, /* something insanely large to be on the safe side */ + + Curl_multissl_init, /* init */ + Curl_none_cleanup, /* cleanup */ + Curl_multissl_version, /* version */ + Curl_none_check_cxn, /* check_cxn */ + Curl_none_shutdown, /* shutdown */ + Curl_none_data_pending, /* data_pending */ + Curl_none_random, /* random */ + Curl_none_cert_status_request, /* cert_status_request */ + Curl_multissl_connect, /* connect */ + Curl_multissl_connect_nonblocking, /* connect_nonblocking */ + Curl_multissl_get_internals, /* get_internals */ + Curl_multissl_close, /* close_one */ + Curl_none_close_all, /* close_all */ + Curl_none_session_free, /* session_free */ + Curl_none_set_engine, /* set_engine */ + Curl_none_set_engine_default, /* set_engine_default */ + Curl_none_engines_list, /* engines_list */ + Curl_none_false_start, /* false_start */ + Curl_none_md5sum, /* md5sum */ + NULL /* sha256sum */ +}; + +const struct Curl_ssl *Curl_ssl = +#if defined(CURL_WITH_MULTI_SSL) + &Curl_ssl_multi; +#elif defined(USE_AXTLS) + &Curl_ssl_axtls; +#elif defined(USE_CYASSL) + &Curl_ssl_cyassl; +#elif defined(USE_DARWINSSL) + &Curl_ssl_darwinssl; +#elif defined(USE_GNUTLS) + &Curl_ssl_gnutls; +#elif defined(USE_GSKIT) + &Curl_ssl_gskit; +#elif defined(USE_MBEDTLS) + &Curl_ssl_mbedtls; +#elif defined(USE_NSS) + &Curl_ssl_nss; +#elif defined(USE_OPENSSL) + &Curl_ssl_openssl; +#elif defined(USE_POLARSSL) + &Curl_ssl_polarssl; +#elif defined(USE_SCHANNEL) + &Curl_ssl_schannel; +#else +#error "Missing struct Curl_ssl for selected SSL backend" +#endif + +static const struct Curl_ssl *available_backends[] = { +#if defined(USE_AXTLS) + &Curl_ssl_axtls, +#endif +#if defined(USE_CYASSL) + &Curl_ssl_cyassl, +#endif +#if defined(USE_DARWINSSL) + &Curl_ssl_darwinssl, +#endif +#if defined(USE_GNUTLS) + &Curl_ssl_gnutls, +#endif +#if defined(USE_GSKIT) + &Curl_ssl_gskit, +#endif +#if defined(USE_MBEDTLS) + &Curl_ssl_mbedtls, +#endif +#if defined(USE_NSS) + &Curl_ssl_nss, +#endif +#if defined(USE_OPENSSL) + &Curl_ssl_openssl, +#endif +#if defined(USE_POLARSSL) + &Curl_ssl_polarssl, +#endif +#if defined(USE_SCHANNEL) + &Curl_ssl_schannel, +#endif + NULL +}; + +static size_t Curl_multissl_version(char *buffer, size_t size) +{ + static const struct Curl_ssl *selected; + static char backends[200]; + static size_t total; + const struct Curl_ssl *current; + + current = Curl_ssl == &Curl_ssl_multi ? available_backends[0] : Curl_ssl; + + if(current != selected) { + char *p = backends; + int i; + + selected = current; + + for(i = 0; available_backends[i]; i++) { + if(i) + *(p++) = ' '; + if(selected != available_backends[i]) + *(p++) = '('; + p += available_backends[i]->version(p, backends + sizeof(backends) - p); + if(selected != available_backends[i]) + *(p++) = ')'; + } + *p = '\0'; + total = p - backends; + } + + if(size < total) + memcpy(buffer, backends, total + 1); + else { + memcpy(buffer, backends, size - 1); + buffer[size - 1] = '\0'; + } + + return total; +} + +static int multissl_init(const struct Curl_ssl *backend) +{ + const char *env; + char *env_tmp; + int i; + + if(Curl_ssl != &Curl_ssl_multi) + return 1; + + if(backend) { + Curl_ssl = backend; + return 0; + } + + if(!available_backends[0]) + return 1; + + env = env_tmp = curl_getenv("CURL_SSL_BACKEND"); +#ifdef CURL_DEFAULT_SSL_BACKEND + if(!env) + env = CURL_DEFAULT_SSL_BACKEND; +#endif + if(env) { + for(i = 0; available_backends[i]; i++) { + if(strcasecompare(env, available_backends[i]->info.name)) { + Curl_ssl = available_backends[i]; + curl_free(env_tmp); + return 0; + } + } + } + + /* Fall back to first available backend */ + Curl_ssl = available_backends[0]; + curl_free(env_tmp); + return 0; +} + +CURLsslset curl_global_sslset(curl_sslbackend id, const char *name, + const curl_ssl_backend ***avail) +{ + int i; + + if(Curl_ssl != &Curl_ssl_multi) + return id == Curl_ssl->info.id ? CURLSSLSET_OK : CURLSSLSET_TOO_LATE; + + for(i = 0; available_backends[i]; i++) { + if(available_backends[i]->info.id == id || + (name && strcasecompare(available_backends[i]->info.name, name))) { + multissl_init(available_backends[i]); + return CURLSSLSET_OK; + } + } + + if(avail) + *avail = (const curl_ssl_backend **)&available_backends; + return CURLSSLSET_UNKNOWN_BACKEND; +} + +#else /* USE_SSL */ +CURLsslset curl_global_sslset(curl_sslbackend id, const char *name, + const curl_ssl_backend ***avail) +{ + (void)id; + (void)name; + (void)avail; + return CURLSSLSET_NO_BACKENDS; +} + +#endif /* !USE_SSL */ |