diff options
Diffstat (limited to 'Utilities/cmcurl/lib/vtls/gtls.c')
| -rw-r--r-- | Utilities/cmcurl/lib/vtls/gtls.c | 1883 |
1 files changed, 1883 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/vtls/gtls.c b/Utilities/cmcurl/lib/vtls/gtls.c new file mode 100644 index 0000000..37662a7 --- /dev/null +++ b/Utilities/cmcurl/lib/vtls/gtls.c @@ -0,0 +1,1883 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2018, 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. + * + ***************************************************************************/ + +/* + * Source file for all GnuTLS-specific code for the TLS/SSL layer. No code + * but vtls.c should ever call or use these functions. + * + * Note: don't use the GnuTLS' *_t variable type names in this source code, + * since they were not present in 1.0.X. + */ + +#include "curl_setup.h" + +#ifdef USE_GNUTLS + +#include <gnutls/abstract.h> +#include <gnutls/gnutls.h> +#include <gnutls/x509.h> + +#ifdef USE_GNUTLS_NETTLE +#include <gnutls/crypto.h> +#include <nettle/md5.h> +#include <nettle/sha2.h> +#else +#include <gcrypt.h> +#endif + +#include "urldata.h" +#include "sendf.h" +#include "inet_pton.h" +#include "gtls.h" +#include "vtls.h" +#include "parsedate.h" +#include "connect.h" /* for the connect timeout */ +#include "select.h" +#include "strcase.h" +#include "warnless.h" +#include "x509asn1.h" +#include "curl_printf.h" +#include "curl_memory.h" +/* The last #include file should be: */ +#include "memdebug.h" + +/* Enable GnuTLS debugging by defining GTLSDEBUG */ +/*#define GTLSDEBUG */ + +#ifdef GTLSDEBUG +static void tls_log_func(int level, const char *str) +{ + fprintf(stderr, "|<%d>| %s", level, str); +} +#endif +static bool gtls_inited = FALSE; + +#if defined(GNUTLS_VERSION_NUMBER) +# if (GNUTLS_VERSION_NUMBER >= 0x020c00) +# undef gnutls_transport_set_lowat +# define gnutls_transport_set_lowat(A,B) Curl_nop_stmt +# define USE_GNUTLS_PRIORITY_SET_DIRECT 1 +# endif +# if (GNUTLS_VERSION_NUMBER >= 0x020c03) +# define GNUTLS_MAPS_WINSOCK_ERRORS 1 +# endif + +# if HAVE_GNUTLS_ALPN_SET_PROTOCOLS +# define HAS_ALPN +# endif + +# if HAVE_GNUTLS_OCSP_REQ_INIT +# define HAS_OCSP +# endif + +# if (GNUTLS_VERSION_NUMBER >= 0x030306) +# define HAS_CAPATH +# endif +#endif + +#if (GNUTLS_VERSION_NUMBER >= 0x030603) +#define HAS_TLS13 +#endif + +#ifdef HAS_OCSP +# include <gnutls/ocsp.h> +#endif + +struct ssl_backend_data { + gnutls_session_t session; + gnutls_certificate_credentials_t cred; +#ifdef USE_TLS_SRP + gnutls_srp_client_credentials_t srp_client_cred; +#endif +}; + +#define BACKEND connssl->backend + +/* + * Custom push and pull callback functions used by GNU TLS to read and write + * to the socket. These functions are simple wrappers to send() and recv() + * (although here using the sread/swrite macros as defined by + * curl_setup_once.h). + * We use custom functions rather than the GNU TLS defaults because it allows + * us to get specific about the fourth "flags" argument, and to use arbitrary + * private data with gnutls_transport_set_ptr if we wish. + * + * When these custom push and pull callbacks fail, GNU TLS checks its own + * session-specific error variable, and when not set also its own global + * errno variable, in order to take appropriate action. GNU TLS does not + * require that the transport is actually a socket. This implies that for + * Windows builds these callbacks should ideally set the session-specific + * error variable using function gnutls_transport_set_errno or as a last + * resort global errno variable using gnutls_transport_set_global_errno, + * with a transport agnostic error value. This implies that some winsock + * error translation must take place in these callbacks. + * + * Paragraph above applies to GNU TLS versions older than 2.12.3, since + * this version GNU TLS does its own internal winsock error translation + * using system_errno() function. + */ + +#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS) +# define gtls_EINTR 4 +# define gtls_EIO 5 +# define gtls_EAGAIN 11 +static int gtls_mapped_sockerrno(void) +{ + switch(SOCKERRNO) { + case WSAEWOULDBLOCK: + return gtls_EAGAIN; + case WSAEINTR: + return gtls_EINTR; + default: + break; + } + return gtls_EIO; +} +#endif + +static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len) +{ + curl_socket_t sock = *(curl_socket_t *)s; + ssize_t ret = swrite(sock, buf, len); +#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS) + if(ret < 0) + gnutls_transport_set_global_errno(gtls_mapped_sockerrno()); +#endif + return ret; +} + +static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len) +{ + curl_socket_t sock = *(curl_socket_t *)s; + ssize_t ret = sread(sock, buf, len); +#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS) + if(ret < 0) + gnutls_transport_set_global_errno(gtls_mapped_sockerrno()); +#endif + return ret; +} + +static ssize_t Curl_gtls_push_ssl(void *s, const void *buf, size_t len) +{ + return gnutls_record_send((gnutls_session_t) s, buf, len); +} + +static ssize_t Curl_gtls_pull_ssl(void *s, void *buf, size_t len) +{ + return gnutls_record_recv((gnutls_session_t) s, buf, len); +} + +/* Curl_gtls_init() + * + * Global GnuTLS init, called from Curl_ssl_init(). This calls functions that + * are not thread-safe and thus this function itself is not thread-safe and + * must only be called from within curl_global_init() to keep the thread + * situation under control! + */ +static int Curl_gtls_init(void) +{ + int ret = 1; + if(!gtls_inited) { + ret = gnutls_global_init()?0:1; +#ifdef GTLSDEBUG + gnutls_global_set_log_function(tls_log_func); + gnutls_global_set_log_level(2); +#endif + gtls_inited = TRUE; + } + return ret; +} + +static void Curl_gtls_cleanup(void) +{ + if(gtls_inited) { + gnutls_global_deinit(); + gtls_inited = FALSE; + } +} + +#ifndef CURL_DISABLE_VERBOSE_STRINGS +static void showtime(struct Curl_easy *data, + const char *text, + time_t stamp) +{ + struct tm buffer; + const struct tm *tm = &buffer; + char str[96]; + CURLcode result = Curl_gmtime(stamp, &buffer); + if(result) + return; + + snprintf(str, + sizeof(str), + "\t %s: %s, %02d %s %4d %02d:%02d:%02d GMT", + text, + Curl_wkday[tm->tm_wday?tm->tm_wday-1:6], + tm->tm_mday, + Curl_month[tm->tm_mon], + tm->tm_year + 1900, + tm->tm_hour, + tm->tm_min, + tm->tm_sec); + infof(data, "%s\n", str); +} +#endif + +static gnutls_datum_t load_file(const char *file) +{ + FILE *f; + gnutls_datum_t loaded_file = { NULL, 0 }; + long filelen; + void *ptr; + + f = fopen(file, "rb"); + if(!f) + return loaded_file; + if(fseek(f, 0, SEEK_END) != 0 + || (filelen = ftell(f)) < 0 + || fseek(f, 0, SEEK_SET) != 0 + || !(ptr = malloc((size_t)filelen))) + goto out; + if(fread(ptr, 1, (size_t)filelen, f) < (size_t)filelen) { + free(ptr); + goto out; + } + + loaded_file.data = ptr; + loaded_file.size = (unsigned int)filelen; +out: + fclose(f); + return loaded_file; +} + +static void unload_file(gnutls_datum_t data) +{ + free(data.data); +} + + +/* this function does a SSL/TLS (re-)handshake */ +static CURLcode handshake(struct connectdata *conn, + int sockindex, + bool duringconnect, + bool nonblocking) +{ + struct Curl_easy *data = conn->data; + struct ssl_connect_data *connssl = &conn->ssl[sockindex]; + gnutls_session_t session = BACKEND->session; + curl_socket_t sockfd = conn->sock[sockindex]; + time_t timeout_ms; + int rc; + int what; + + for(;;) { + /* check allowed time left */ + timeout_ms = Curl_timeleft(data, NULL, duringconnect); + + if(timeout_ms < 0) { + /* no need to continue if time already is up */ + failf(data, "SSL connection timeout"); + return CURLE_OPERATION_TIMEDOUT; + } + + /* if ssl is expecting something, check if it's available. */ + if(connssl->connecting_state == ssl_connect_2_reading + || connssl->connecting_state == ssl_connect_2_writing) { + + curl_socket_t writefd = ssl_connect_2_writing == + connssl->connecting_state?sockfd:CURL_SOCKET_BAD; + curl_socket_t readfd = ssl_connect_2_reading == + connssl->connecting_state?sockfd:CURL_SOCKET_BAD; + + what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd, + nonblocking?0: + timeout_ms?timeout_ms:1000); + if(what < 0) { + /* fatal error */ + failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO); + return CURLE_SSL_CONNECT_ERROR; + } + else if(0 == what) { + if(nonblocking) + return CURLE_OK; + else if(timeout_ms) { + /* timeout */ + failf(data, "SSL connection timeout at %ld", (long)timeout_ms); + return CURLE_OPERATION_TIMEDOUT; + } + } + /* socket is readable or writable */ + } + + rc = gnutls_handshake(session); + + if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) { + connssl->connecting_state = + gnutls_record_get_direction(session)? + ssl_connect_2_writing:ssl_connect_2_reading; + continue; + } + else if((rc < 0) && !gnutls_error_is_fatal(rc)) { + const char *strerr = NULL; + + if(rc == GNUTLS_E_WARNING_ALERT_RECEIVED) { + int alert = gnutls_alert_get(session); + strerr = gnutls_alert_get_name(alert); + } + + if(strerr == NULL) + strerr = gnutls_strerror(rc); + + infof(data, "gnutls_handshake() warning: %s\n", strerr); + continue; + } + else if(rc < 0) { + const char *strerr = NULL; + + if(rc == GNUTLS_E_FATAL_ALERT_RECEIVED) { + int alert = gnutls_alert_get(session); + strerr = gnutls_alert_get_name(alert); + } + + if(strerr == NULL) + strerr = gnutls_strerror(rc); + + failf(data, "gnutls_handshake() failed: %s", strerr); + return CURLE_SSL_CONNECT_ERROR; + } + + /* Reset our connect state machine */ + connssl->connecting_state = ssl_connect_1; + return CURLE_OK; + } +} + +static gnutls_x509_crt_fmt_t do_file_type(const char *type) +{ + if(!type || !type[0]) + return GNUTLS_X509_FMT_PEM; + if(strcasecompare(type, "PEM")) + return GNUTLS_X509_FMT_PEM; + if(strcasecompare(type, "DER")) + return GNUTLS_X509_FMT_DER; + return -1; +} + +#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT +static CURLcode +set_ssl_version_min_max(int *list, size_t list_size, struct connectdata *conn) +{ + struct Curl_easy *data = conn->data; + long ssl_version = SSL_CONN_CONFIG(version); + long ssl_version_max = SSL_CONN_CONFIG(version_max); + long i = ssl_version; + long protocol_priority_idx = 0; + + switch(ssl_version_max) { + case CURL_SSLVERSION_MAX_NONE: + case CURL_SSLVERSION_MAX_DEFAULT: +#ifdef HAS_TLS13 + ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_3; +#endif + ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2; + break; + } + + for(; i <= (ssl_version_max >> 16) && + protocol_priority_idx < list_size; ++i) { + switch(i) { + case CURL_SSLVERSION_TLSv1_0: + protocol_priority[protocol_priority_idx++] = GNUTLS_TLS1_0; + break; + case CURL_SSLVERSION_TLSv1_1: + protocol_priority[protocol_priority_idx++] = GNUTLS_TLS1_1; + break; + case CURL_SSLVERSION_TLSv1_2: + protocol_priority[protocol_priority_idx++] = GNUTLS_TLS1_2; + break; + case CURL_SSLVERSION_TLSv1_3: +#ifdef HAS_TLS13 + protocol_priority[protocol_priority_idx++] = GNUTLS_TLS1_3; + break; +#else + failf(data, "GnuTLS: TLS 1.3 is not yet supported"); + return CURLE_SSL_CONNECT_ERROR; +#endif + } + } + return CURLE_OK; +} +#else +#define GNUTLS_CIPHERS "NORMAL:-ARCFOUR-128:-CTYPE-ALL:+CTYPE-X509" +/* If GnuTLS was compiled without support for SRP it will error out if SRP is + requested in the priority string, so treat it specially + */ +#define GNUTLS_SRP "+SRP" + +static CURLcode +set_ssl_version_min_max(const char **prioritylist, struct connectdata *conn) +{ + struct Curl_easy *data = conn->data; + long ssl_version = SSL_CONN_CONFIG(version); + long ssl_version_max = SSL_CONN_CONFIG(version_max); + + if(ssl_version_max == CURL_SSLVERSION_MAX_NONE) { + ssl_version_max = CURL_SSLVERSION_MAX_DEFAULT; + } + switch(ssl_version | ssl_version_max) { + case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_0: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.0:" GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_1: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.0:+VERS-TLS1.1:" GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_2: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.0:+VERS-TLS1.1:+VERS-TLS1.2:" GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_TLSv1_1: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.1:" GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_TLSv1_2: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.1:+VERS-TLS1.2:" GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_TLSv1_2: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.2:" GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_3 | CURL_SSLVERSION_MAX_TLSv1_3: +#ifdef HAS_TLS13 + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.3:" GNUTLS_SRP; + return CURLE_OK; +#else + failf(data, "GnuTLS: TLS 1.3 is not yet supported"); + return CURLE_SSL_CONNECT_ERROR; +#endif + case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_DEFAULT: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.0:+VERS-TLS1.1:+VERS-TLS1.2:" +#ifdef HAS_TLS13 + "+VERS-TLS1.3:" +#endif + GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_DEFAULT: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.1:+VERS-TLS1.2:" +#ifdef HAS_TLS13 + "+VERS-TLS1.3:" +#endif + GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_DEFAULT: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.2:" +#ifdef HAS_TLS13 + "+VERS-TLS1.3:" +#endif + GNUTLS_SRP; + return CURLE_OK; + case CURL_SSLVERSION_TLSv1_3 | CURL_SSLVERSION_MAX_DEFAULT: + *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:" + "+VERS-TLS1.2:" +#ifdef HAS_TLS13 + "+VERS-TLS1.3:" +#endif + GNUTLS_SRP; + return CURLE_OK; + } + + failf(data, "GnuTLS: cannot set ssl protocol"); + return CURLE_SSL_CONNECT_ERROR; +} +#endif + +static CURLcode +gtls_connect_step1(struct connectdata *conn, + int sockindex) +{ + struct Curl_easy *data = conn->data; + struct ssl_connect_data *connssl = &conn->ssl[sockindex]; + unsigned int init_flags; + gnutls_session_t session; + int rc; + bool sni = TRUE; /* default is SNI enabled */ + void *transport_ptr = NULL; + gnutls_push_func gnutls_transport_push = NULL; + gnutls_pull_func gnutls_transport_pull = NULL; +#ifdef ENABLE_IPV6 + struct in6_addr addr; +#else + struct in_addr addr; +#endif +#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT + static const int cipher_priority[] = { + /* These two ciphers were added to GnuTLS as late as ver. 3.0.1, + but this code path is only ever used for ver. < 2.12.0. + GNUTLS_CIPHER_AES_128_GCM, + GNUTLS_CIPHER_AES_256_GCM, + */ + GNUTLS_CIPHER_AES_128_CBC, + GNUTLS_CIPHER_AES_256_CBC, + GNUTLS_CIPHER_CAMELLIA_128_CBC, + GNUTLS_CIPHER_CAMELLIA_256_CBC, + GNUTLS_CIPHER_3DES_CBC, + }; + static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 }; + int protocol_priority[] = { 0, 0, 0, 0 }; +#else + const char *prioritylist; + const char *err = NULL; +#endif + + const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name : + conn->host.name; + + if(connssl->state == ssl_connection_complete) + /* to make us tolerant against being called more than once for the + same connection */ + return CURLE_OK; + + if(!gtls_inited) + Curl_gtls_init(); + + if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) { + failf(data, "GnuTLS does not support SSLv2"); + return CURLE_SSL_CONNECT_ERROR; + } + else if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv3) + sni = FALSE; /* SSLv3 has no SNI */ + + /* allocate a cred struct */ + rc = gnutls_certificate_allocate_credentials(&BACKEND->cred); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc)); + return CURLE_SSL_CONNECT_ERROR; + } + +#ifdef USE_TLS_SRP + if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP) { + infof(data, "Using TLS-SRP username: %s\n", SSL_SET_OPTION(username)); + + rc = gnutls_srp_allocate_client_credentials( + &BACKEND->srp_client_cred); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_srp_allocate_client_cred() failed: %s", + gnutls_strerror(rc)); + return CURLE_OUT_OF_MEMORY; + } + + rc = gnutls_srp_set_client_credentials(BACKEND->srp_client_cred, + SSL_SET_OPTION(username), + SSL_SET_OPTION(password)); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_srp_set_client_cred() failed: %s", + gnutls_strerror(rc)); + return CURLE_BAD_FUNCTION_ARGUMENT; + } + } +#endif + + if(SSL_CONN_CONFIG(CAfile)) { + /* set the trusted CA cert bundle file */ + gnutls_certificate_set_verify_flags(BACKEND->cred, + GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT); + + rc = gnutls_certificate_set_x509_trust_file(BACKEND->cred, + SSL_CONN_CONFIG(CAfile), + GNUTLS_X509_FMT_PEM); + if(rc < 0) { + infof(data, "error reading ca cert file %s (%s)\n", + SSL_CONN_CONFIG(CAfile), gnutls_strerror(rc)); + if(SSL_CONN_CONFIG(verifypeer)) + return CURLE_SSL_CACERT_BADFILE; + } + else + infof(data, "found %d certificates in %s\n", rc, + SSL_CONN_CONFIG(CAfile)); + } + +#ifdef HAS_CAPATH + if(SSL_CONN_CONFIG(CApath)) { + /* set the trusted CA cert directory */ + rc = gnutls_certificate_set_x509_trust_dir(BACKEND->cred, + SSL_CONN_CONFIG(CApath), + GNUTLS_X509_FMT_PEM); + if(rc < 0) { + infof(data, "error reading ca cert file %s (%s)\n", + SSL_CONN_CONFIG(CApath), gnutls_strerror(rc)); + if(SSL_CONN_CONFIG(verifypeer)) + return CURLE_SSL_CACERT_BADFILE; + } + else + infof(data, "found %d certificates in %s\n", + rc, SSL_CONN_CONFIG(CApath)); + } +#endif + +#ifdef CURL_CA_FALLBACK + /* use system ca certificate store as fallback */ + if(SSL_CONN_CONFIG(verifypeer) && + !(SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(CApath))) { + gnutls_certificate_set_x509_system_trust(BACKEND->cred); + } +#endif + + if(SSL_SET_OPTION(CRLfile)) { + /* set the CRL list file */ + rc = gnutls_certificate_set_x509_crl_file(BACKEND->cred, + SSL_SET_OPTION(CRLfile), + GNUTLS_X509_FMT_PEM); + if(rc < 0) { + failf(data, "error reading crl file %s (%s)", + SSL_SET_OPTION(CRLfile), gnutls_strerror(rc)); + return CURLE_SSL_CRL_BADFILE; + } + else + infof(data, "found %d CRL in %s\n", + rc, SSL_SET_OPTION(CRLfile)); + } + + /* Initialize TLS session as a client */ + init_flags = GNUTLS_CLIENT; + +#if defined(GNUTLS_NO_TICKETS) + /* Disable TLS session tickets */ + init_flags |= GNUTLS_NO_TICKETS; +#endif + + rc = gnutls_init(&BACKEND->session, init_flags); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_init() failed: %d", rc); + return CURLE_SSL_CONNECT_ERROR; + } + + /* convenient assign */ + session = BACKEND->session; + + if((0 == Curl_inet_pton(AF_INET, hostname, &addr)) && +#ifdef ENABLE_IPV6 + (0 == Curl_inet_pton(AF_INET6, hostname, &addr)) && +#endif + sni && + (gnutls_server_name_set(session, GNUTLS_NAME_DNS, hostname, + strlen(hostname)) < 0)) + infof(data, "WARNING: failed to configure server name indication (SNI) " + "TLS extension\n"); + + /* Use default priorities */ + rc = gnutls_set_default_priority(session); + if(rc != GNUTLS_E_SUCCESS) + return CURLE_SSL_CONNECT_ERROR; + +#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT + rc = gnutls_cipher_set_priority(session, cipher_priority); + if(rc != GNUTLS_E_SUCCESS) + return CURLE_SSL_CONNECT_ERROR; + + /* Sets the priority on the certificate types supported by gnutls. Priority + is higher for types specified before others. After specifying the types + you want, you must append a 0. */ + rc = gnutls_certificate_type_set_priority(session, cert_type_priority); + if(rc != GNUTLS_E_SUCCESS) + return CURLE_SSL_CONNECT_ERROR; + + if(SSL_CONN_CONFIG(cipher_list) != NULL) { + failf(data, "can't pass a custom cipher list to older GnuTLS" + " versions"); + return CURLE_SSL_CONNECT_ERROR; + } + + switch(SSL_CONN_CONFIG(version)) { + case CURL_SSLVERSION_SSLv3: + protocol_priority[0] = GNUTLS_SSL3; + break; + case CURL_SSLVERSION_DEFAULT: + case CURL_SSLVERSION_TLSv1: + protocol_priority[0] = GNUTLS_TLS1_0; + protocol_priority[1] = GNUTLS_TLS1_1; + protocol_priority[2] = GNUTLS_TLS1_2; +#ifdef HAS_TLS13 + protocol_priority[3] = GNUTLS_TLS1_3; +#endif + break; + case CURL_SSLVERSION_TLSv1_0: + case CURL_SSLVERSION_TLSv1_1: + case CURL_SSLVERSION_TLSv1_2: + case CURL_SSLVERSION_TLSv1_3: + { + CURLcode result = set_ssl_version_min_max(protocol_priority, + sizeof(protocol_priority)/sizeof(protocol_priority[0]), conn); + if(result != CURLE_OK) + return result; + break; + } + case CURL_SSLVERSION_SSLv2: + failf(data, "GnuTLS does not support SSLv2"); + return CURLE_SSL_CONNECT_ERROR; + default: + failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION"); + return CURLE_SSL_CONNECT_ERROR; + } + rc = gnutls_protocol_set_priority(session, protocol_priority); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "Did you pass a valid GnuTLS cipher list?"); + return CURLE_SSL_CONNECT_ERROR; + } + +#else + /* Ensure +SRP comes at the *end* of all relevant strings so that it can be + * removed if a run-time error indicates that SRP is not supported by this + * GnuTLS version */ + switch(SSL_CONN_CONFIG(version)) { + case CURL_SSLVERSION_SSLv3: + prioritylist = GNUTLS_CIPHERS ":-VERS-TLS-ALL:+VERS-SSL3.0"; + break; + case CURL_SSLVERSION_DEFAULT: + case CURL_SSLVERSION_TLSv1: + prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:" +#ifdef HAS_TLS13 + "+VERS-TLS1.3:" +#endif + GNUTLS_SRP; + break; + case CURL_SSLVERSION_TLSv1_0: + case CURL_SSLVERSION_TLSv1_1: + case CURL_SSLVERSION_TLSv1_2: + case CURL_SSLVERSION_TLSv1_3: + { + CURLcode result = set_ssl_version_min_max(&prioritylist, conn); + if(result != CURLE_OK) + return result; + break; + } + case CURL_SSLVERSION_SSLv2: + failf(data, "GnuTLS does not support SSLv2"); + return CURLE_SSL_CONNECT_ERROR; + default: + failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION"); + return CURLE_SSL_CONNECT_ERROR; + } + rc = gnutls_priority_set_direct(session, prioritylist, &err); + if((rc == GNUTLS_E_INVALID_REQUEST) && err) { + if(!strcmp(err, GNUTLS_SRP)) { + /* This GnuTLS was probably compiled without support for SRP. + * Note that fact and try again without it. */ + int validprioritylen = curlx_uztosi(err - prioritylist); + char *prioritycopy = strdup(prioritylist); + if(!prioritycopy) + return CURLE_OUT_OF_MEMORY; + + infof(data, "This GnuTLS does not support SRP\n"); + if(validprioritylen) + /* Remove the :+SRP */ + prioritycopy[validprioritylen - 1] = 0; + rc = gnutls_priority_set_direct(session, prioritycopy, &err); + free(prioritycopy); + } + } + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "Error %d setting GnuTLS cipher list starting with %s", + rc, err); + return CURLE_SSL_CONNECT_ERROR; + } +#endif + +#ifdef HAS_ALPN + if(conn->bits.tls_enable_alpn) { + int cur = 0; + gnutls_datum_t protocols[2]; + +#ifdef USE_NGHTTP2 + if(data->set.httpversion >= CURL_HTTP_VERSION_2 && + (!SSL_IS_PROXY() || !conn->bits.tunnel_proxy)) { + protocols[cur].data = (unsigned char *)NGHTTP2_PROTO_VERSION_ID; + protocols[cur].size = NGHTTP2_PROTO_VERSION_ID_LEN; + cur++; + infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID); + } +#endif + + protocols[cur].data = (unsigned char *)ALPN_HTTP_1_1; + protocols[cur].size = ALPN_HTTP_1_1_LENGTH; + cur++; + infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1); + + gnutls_alpn_set_protocols(session, protocols, cur, 0); + } +#endif + + if(SSL_SET_OPTION(cert)) { + if(SSL_SET_OPTION(key_passwd)) { +#if HAVE_GNUTLS_CERTIFICATE_SET_X509_KEY_FILE2 + const unsigned int supported_key_encryption_algorithms = + GNUTLS_PKCS_USE_PKCS12_3DES | GNUTLS_PKCS_USE_PKCS12_ARCFOUR | + GNUTLS_PKCS_USE_PKCS12_RC2_40 | GNUTLS_PKCS_USE_PBES2_3DES | + GNUTLS_PKCS_USE_PBES2_AES_128 | GNUTLS_PKCS_USE_PBES2_AES_192 | + GNUTLS_PKCS_USE_PBES2_AES_256; + rc = gnutls_certificate_set_x509_key_file2( + BACKEND->cred, + SSL_SET_OPTION(cert), + SSL_SET_OPTION(key) ? + SSL_SET_OPTION(key) : SSL_SET_OPTION(cert), + do_file_type(SSL_SET_OPTION(cert_type)), + SSL_SET_OPTION(key_passwd), + supported_key_encryption_algorithms); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, + "error reading X.509 potentially-encrypted key file: %s", + gnutls_strerror(rc)); + return CURLE_SSL_CONNECT_ERROR; + } +#else + failf(data, "gnutls lacks support for encrypted key files"); + return CURLE_SSL_CONNECT_ERROR; +#endif + } + else { + if(gnutls_certificate_set_x509_key_file( + BACKEND->cred, + SSL_SET_OPTION(cert), + SSL_SET_OPTION(key) ? + SSL_SET_OPTION(key) : SSL_SET_OPTION(cert), + do_file_type(SSL_SET_OPTION(cert_type)) ) != + GNUTLS_E_SUCCESS) { + failf(data, "error reading X.509 key or certificate file"); + return CURLE_SSL_CONNECT_ERROR; + } + } + } + +#ifdef USE_TLS_SRP + /* put the credentials to the current session */ + if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP) { + rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP, + BACKEND->srp_client_cred); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc)); + return CURLE_SSL_CONNECT_ERROR; + } + } + else +#endif + { + rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, + BACKEND->cred); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc)); + return CURLE_SSL_CONNECT_ERROR; + } + } + + if(conn->proxy_ssl[sockindex].use) { + transport_ptr = conn->proxy_ssl[sockindex].backend->session; + gnutls_transport_push = Curl_gtls_push_ssl; + gnutls_transport_pull = Curl_gtls_pull_ssl; + } + else { + /* file descriptor for the socket */ + transport_ptr = &conn->sock[sockindex]; + gnutls_transport_push = Curl_gtls_push; + gnutls_transport_pull = Curl_gtls_pull; + } + + /* set the connection handle */ + gnutls_transport_set_ptr(session, transport_ptr); + + /* register callback functions to send and receive data. */ + gnutls_transport_set_push_function(session, gnutls_transport_push); + gnutls_transport_set_pull_function(session, gnutls_transport_pull); + + /* lowat must be set to zero when using custom push and pull functions. */ + gnutls_transport_set_lowat(session, 0); + +#ifdef HAS_OCSP + if(SSL_CONN_CONFIG(verifystatus)) { + rc = gnutls_ocsp_status_request_enable_client(session, NULL, 0, NULL); + if(rc != GNUTLS_E_SUCCESS) { + failf(data, "gnutls_ocsp_status_request_enable_client() failed: %d", rc); + return CURLE_SSL_CONNECT_ERROR; + } + } +#endif + + /* This might be a reconnect, so we check for a session ID in the cache + to speed up things */ + if(SSL_SET_OPTION(primary.sessionid)) { + void *ssl_sessionid; + size_t ssl_idsize; + + Curl_ssl_sessionid_lock(conn); + if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize, sockindex)) { + /* we got a session id, use it! */ + gnutls_session_set_data(session, ssl_sessionid, ssl_idsize); + + /* Informational message */ + infof(data, "SSL re-using session ID\n"); + } + Curl_ssl_sessionid_unlock(conn); + } + + return CURLE_OK; +} + +static CURLcode pkp_pin_peer_pubkey(struct Curl_easy *data, + gnutls_x509_crt_t cert, + const char *pinnedpubkey) +{ + /* Scratch */ + size_t len1 = 0, len2 = 0; + unsigned char *buff1 = NULL; + + gnutls_pubkey_t key = NULL; + + /* Result is returned to caller */ + int ret = 0; + CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH; + + /* if a path wasn't specified, don't pin */ + if(NULL == pinnedpubkey) + return CURLE_OK; + + if(NULL == cert) + return result; + + do { + /* Begin Gyrations to get the public key */ + gnutls_pubkey_init(&key); + + ret = gnutls_pubkey_import_x509(key, cert, 0); + if(ret < 0) + break; /* failed */ + + ret = gnutls_pubkey_export(key, GNUTLS_X509_FMT_DER, NULL, &len1); + if(ret != GNUTLS_E_SHORT_MEMORY_BUFFER || len1 == 0) + break; /* failed */ + + buff1 = malloc(len1); + if(NULL == buff1) + break; /* failed */ + + len2 = len1; + + ret = gnutls_pubkey_export(key, GNUTLS_X509_FMT_DER, buff1, &len2); + if(ret < 0 || len1 != len2) + break; /* failed */ + + /* End Gyrations */ + + /* The one good exit point */ + result = Curl_pin_peer_pubkey(data, pinnedpubkey, buff1, len1); + } while(0); + + if(NULL != key) + gnutls_pubkey_deinit(key); + + Curl_safefree(buff1); + + return result; +} + +static Curl_recv gtls_recv; +static Curl_send gtls_send; + +static CURLcode +gtls_connect_step3(struct connectdata *conn, + int sockindex) +{ + unsigned int cert_list_size; + const gnutls_datum_t *chainp; + unsigned int verify_status = 0; + gnutls_x509_crt_t x509_cert, x509_issuer; + gnutls_datum_t issuerp; + char certbuf[256] = ""; /* big enough? */ + size_t size; + time_t certclock; + const char *ptr; + struct Curl_easy *data = conn->data; + struct ssl_connect_data *connssl = &conn->ssl[sockindex]; + gnutls_session_t session = BACKEND->session; + int rc; +#ifdef HAS_ALPN + gnutls_datum_t proto; +#endif + CURLcode result = CURLE_OK; +#ifndef CURL_DISABLE_VERBOSE_STRINGS + unsigned int algo; + unsigned int bits; + gnutls_protocol_t version = gnutls_protocol_get_version(session); +#endif + const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name : + conn->host.name; + + /* the name of the cipher suite used, e.g. ECDHE_RSA_AES_256_GCM_SHA384. */ + ptr = gnutls_cipher_suite_get_name(gnutls_kx_get(session), + gnutls_cipher_get(session), + gnutls_mac_get(session)); + + infof(data, "SSL connection using %s / %s\n", + gnutls_protocol_get_name(version), ptr); + + /* This function will return the peer's raw certificate (chain) as sent by + the peer. These certificates are in raw format (DER encoded for + X.509). In case of a X.509 then a certificate list may be present. The + first certificate in the list is the peer's certificate, following the + issuer's certificate, then the issuer's issuer etc. */ + + chainp = gnutls_certificate_get_peers(session, &cert_list_size); + if(!chainp) { + if(SSL_CONN_CONFIG(verifypeer) || + SSL_CONN_CONFIG(verifyhost) || + SSL_SET_OPTION(issuercert)) { +#ifdef USE_TLS_SRP + if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP + && SSL_SET_OPTION(username) != NULL + && !SSL_CONN_CONFIG(verifypeer) + && gnutls_cipher_get(session)) { + /* no peer cert, but auth is ok if we have SRP user and cipher and no + peer verify */ + } + else { +#endif + failf(data, "failed to get server cert"); + return CURLE_PEER_FAILED_VERIFICATION; +#ifdef USE_TLS_SRP + } +#endif + } + infof(data, "\t common name: WARNING couldn't obtain\n"); + } + + if(data->set.ssl.certinfo && chainp) { + unsigned int i; + + result = Curl_ssl_init_certinfo(data, cert_list_size); + if(result) + return result; + + for(i = 0; i < cert_list_size; i++) { + const char *beg = (const char *) chainp[i].data; + const char *end = beg + chainp[i].size; + + result = Curl_extract_certinfo(conn, i, beg, end); + if(result) + return result; + } + } + + if(SSL_CONN_CONFIG(verifypeer)) { + /* This function will try to verify the peer's certificate and return its + status (trusted, invalid etc.). The value of status should be one or + more of the gnutls_certificate_status_t enumerated elements bitwise + or'd. To avoid denial of service attacks some default upper limits + regarding the certificate key size and chain size are set. To override + them use gnutls_certificate_set_verify_limits(). */ + + rc = gnutls_certificate_verify_peers2(session, &verify_status); + if(rc < 0) { + failf(data, "server cert verify failed: %d", rc); + return CURLE_SSL_CONNECT_ERROR; + } + + /* verify_status is a bitmask of gnutls_certificate_status bits */ + if(verify_status & GNUTLS_CERT_INVALID) { + if(SSL_CONN_CONFIG(verifypeer)) { + failf(data, "server certificate verification failed. CAfile: %s " + "CRLfile: %s", SSL_CONN_CONFIG(CAfile) ? SSL_CONN_CONFIG(CAfile): + "none", + SSL_SET_OPTION(CRLfile)?SSL_SET_OPTION(CRLfile):"none"); + return CURLE_SSL_CACERT; + } + else + infof(data, "\t server certificate verification FAILED\n"); + } + else + infof(data, "\t server certificate verification OK\n"); + } + else + infof(data, "\t server certificate verification SKIPPED\n"); + +#ifdef HAS_OCSP + if(SSL_CONN_CONFIG(verifystatus)) { + if(gnutls_ocsp_status_request_is_checked(session, 0) == 0) { + gnutls_datum_t status_request; + gnutls_ocsp_resp_t ocsp_resp; + + gnutls_ocsp_cert_status_t status; + gnutls_x509_crl_reason_t reason; + + rc = gnutls_ocsp_status_request_get(session, &status_request); + + infof(data, "\t server certificate status verification FAILED\n"); + + if(rc == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) { + failf(data, "No OCSP response received"); + return CURLE_SSL_INVALIDCERTSTATUS; + } + + if(rc < 0) { + failf(data, "Invalid OCSP response received"); + return CURLE_SSL_INVALIDCERTSTATUS; + } + + gnutls_ocsp_resp_init(&ocsp_resp); + + rc = gnutls_ocsp_resp_import(ocsp_resp, &status_request); + if(rc < 0) { + failf(data, "Invalid OCSP response received"); + return CURLE_SSL_INVALIDCERTSTATUS; + } + + (void)gnutls_ocsp_resp_get_single(ocsp_resp, 0, NULL, NULL, NULL, NULL, + &status, NULL, NULL, NULL, &reason); + + switch(status) { + case GNUTLS_OCSP_CERT_GOOD: + break; + + case GNUTLS_OCSP_CERT_REVOKED: { + const char *crl_reason; + + switch(reason) { + default: + case GNUTLS_X509_CRLREASON_UNSPECIFIED: + crl_reason = "unspecified reason"; + break; + + case GNUTLS_X509_CRLREASON_KEYCOMPROMISE: + crl_reason = "private key compromised"; + break; + + case GNUTLS_X509_CRLREASON_CACOMPROMISE: + crl_reason = "CA compromised"; + break; + + case GNUTLS_X509_CRLREASON_AFFILIATIONCHANGED: + crl_reason = "affiliation has changed"; + break; + + case GNUTLS_X509_CRLREASON_SUPERSEDED: + crl_reason = "certificate superseded"; + break; + + case GNUTLS_X509_CRLREASON_CESSATIONOFOPERATION: + crl_reason = "operation has ceased"; + break; + + case GNUTLS_X509_CRLREASON_CERTIFICATEHOLD: + crl_reason = "certificate is on hold"; + break; + + case GNUTLS_X509_CRLREASON_REMOVEFROMCRL: + crl_reason = "will be removed from delta CRL"; + break; + + case GNUTLS_X509_CRLREASON_PRIVILEGEWITHDRAWN: + crl_reason = "privilege withdrawn"; + break; + + case GNUTLS_X509_CRLREASON_AACOMPROMISE: + crl_reason = "AA compromised"; + break; + } + + failf(data, "Server certificate was revoked: %s", crl_reason); + break; + } + + default: + case GNUTLS_OCSP_CERT_UNKNOWN: + failf(data, "Server certificate status is unknown"); + break; + } + + gnutls_ocsp_resp_deinit(ocsp_resp); + + return CURLE_SSL_INVALIDCERTSTATUS; + } + else + infof(data, "\t server certificate status verification OK\n"); + } + else + infof(data, "\t server certificate status verification SKIPPED\n"); +#endif + + /* initialize an X.509 certificate structure. */ + gnutls_x509_crt_init(&x509_cert); + + if(chainp) + /* convert the given DER or PEM encoded Certificate to the native + gnutls_x509_crt_t format */ + gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER); + + if(SSL_SET_OPTION(issuercert)) { + gnutls_x509_crt_init(&x509_issuer); + issuerp = load_file(SSL_SET_OPTION(issuercert)); + gnutls_x509_crt_import(x509_issuer, &issuerp, GNUTLS_X509_FMT_PEM); + rc = gnutls_x509_crt_check_issuer(x509_cert, x509_issuer); + gnutls_x509_crt_deinit(x509_issuer); + unload_file(issuerp); + if(rc <= 0) { + failf(data, "server certificate issuer check failed (IssuerCert: %s)", + SSL_SET_OPTION(issuercert)?SSL_SET_OPTION(issuercert):"none"); + gnutls_x509_crt_deinit(x509_cert); + return CURLE_SSL_ISSUER_ERROR; + } + infof(data, "\t server certificate issuer check OK (Issuer Cert: %s)\n", + SSL_SET_OPTION(issuercert)?SSL_SET_OPTION(issuercert):"none"); + } + + size = sizeof(certbuf); + rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME, + 0, /* the first and only one */ + FALSE, + certbuf, + &size); + if(rc) { + infof(data, "error fetching CN from cert:%s\n", + gnutls_strerror(rc)); + } + + /* This function will check if the given certificate's subject matches the + given hostname. This is a basic implementation of the matching described + in RFC2818 (HTTPS), which takes into account wildcards, and the subject + alternative name PKIX extension. Returns non zero on success, and zero on + failure. */ + rc = gnutls_x509_crt_check_hostname(x509_cert, hostname); +#if GNUTLS_VERSION_NUMBER < 0x030306 + /* Before 3.3.6, gnutls_x509_crt_check_hostname() didn't check IP + addresses. */ + if(!rc) { +#ifdef ENABLE_IPV6 + #define use_addr in6_addr +#else + #define use_addr in_addr +#endif + unsigned char addrbuf[sizeof(struct use_addr)]; + unsigned char certaddr[sizeof(struct use_addr)]; + size_t addrlen = 0, certaddrlen; + int i; + int ret = 0; + + if(Curl_inet_pton(AF_INET, hostname, addrbuf) > 0) + addrlen = 4; +#ifdef ENABLE_IPV6 + else if(Curl_inet_pton(AF_INET6, hostname, addrbuf) > 0) + addrlen = 16; +#endif + + if(addrlen) { + for(i = 0; ; i++) { + certaddrlen = sizeof(certaddr); + ret = gnutls_x509_crt_get_subject_alt_name(x509_cert, i, certaddr, + &certaddrlen, NULL); + /* If this happens, it wasn't an IP address. */ + if(ret == GNUTLS_E_SHORT_MEMORY_BUFFER) + continue; + if(ret < 0) + break; + if(ret != GNUTLS_SAN_IPADDRESS) + continue; + if(certaddrlen == addrlen && !memcmp(addrbuf, certaddr, addrlen)) { + rc = 1; + break; + } + } + } + } +#endif + if(!rc) { + const char * const dispname = SSL_IS_PROXY() ? + conn->http_proxy.host.dispname : conn->host.dispname; + + if(SSL_CONN_CONFIG(verifyhost)) { + failf(data, "SSL: certificate subject name (%s) does not match " + "target host name '%s'", certbuf, dispname); + gnutls_x509_crt_deinit(x509_cert); + return CURLE_PEER_FAILED_VERIFICATION; + } + else + infof(data, "\t common name: %s (does not match '%s')\n", + certbuf, dispname); + } + else + infof(data, "\t common name: %s (matched)\n", certbuf); + + /* Check for time-based validity */ + certclock = gnutls_x509_crt_get_expiration_time(x509_cert); + + if(certclock == (time_t)-1) { + if(SSL_CONN_CONFIG(verifypeer)) { + failf(data, "server cert expiration date verify failed"); + gnutls_x509_crt_deinit(x509_cert); + return CURLE_SSL_CONNECT_ERROR; + } + else + infof(data, "\t server certificate expiration date verify FAILED\n"); + } + else { + if(certclock < time(NULL)) { + if(SSL_CONN_CONFIG(verifypeer)) { + failf(data, "server certificate expiration date has passed."); + gnutls_x509_crt_deinit(x509_cert); + return CURLE_PEER_FAILED_VERIFICATION; + } + else + infof(data, "\t server certificate expiration date FAILED\n"); + } + else + infof(data, "\t server certificate expiration date OK\n"); + } + + certclock = gnutls_x509_crt_get_activation_time(x509_cert); + + if(certclock == (time_t)-1) { + if(SSL_CONN_CONFIG(verifypeer)) { + failf(data, "server cert activation date verify failed"); + gnutls_x509_crt_deinit(x509_cert); + return CURLE_SSL_CONNECT_ERROR; + } + else + infof(data, "\t server certificate activation date verify FAILED\n"); + } + else { + if(certclock > time(NULL)) { + if(SSL_CONN_CONFIG(verifypeer)) { + failf(data, "server certificate not activated yet."); + gnutls_x509_crt_deinit(x509_cert); + return CURLE_PEER_FAILED_VERIFICATION; + } + else + infof(data, "\t server certificate activation date FAILED\n"); + } + else + infof(data, "\t server certificate activation date OK\n"); + } + + ptr = SSL_IS_PROXY() ? data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] : + data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG]; + if(ptr) { + result = pkp_pin_peer_pubkey(data, x509_cert, ptr); + if(result != CURLE_OK) { + failf(data, "SSL: public key does not match pinned public key!"); + gnutls_x509_crt_deinit(x509_cert); + return result; + } + } + + /* Show: + + - subject + - start date + - expire date + - common name + - issuer + + */ + +#ifndef CURL_DISABLE_VERBOSE_STRINGS + /* public key algorithm's parameters */ + algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits); + infof(data, "\t certificate public key: %s\n", + gnutls_pk_algorithm_get_name(algo)); + + /* version of the X.509 certificate. */ + infof(data, "\t certificate version: #%d\n", + gnutls_x509_crt_get_version(x509_cert)); + + + size = sizeof(certbuf); + gnutls_x509_crt_get_dn(x509_cert, certbuf, &size); + infof(data, "\t subject: %s\n", certbuf); + + certclock = gnutls_x509_crt_get_activation_time(x509_cert); + showtime(data, "start date", certclock); + + certclock = gnutls_x509_crt_get_expiration_time(x509_cert); + showtime(data, "expire date", certclock); + + size = sizeof(certbuf); + gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size); + infof(data, "\t issuer: %s\n", certbuf); + + /* compression algorithm (if any) */ + ptr = gnutls_compression_get_name(gnutls_compression_get(session)); + /* the *_get_name() says "NULL" if GNUTLS_COMP_NULL is returned */ + infof(data, "\t compression: %s\n", ptr); +#endif + + gnutls_x509_crt_deinit(x509_cert); + +#ifdef HAS_ALPN + if(conn->bits.tls_enable_alpn) { + rc = gnutls_alpn_get_selected_protocol(session, &proto); + if(rc == 0) { + infof(data, "ALPN, server accepted to use %.*s\n", proto.size, + proto.data); + +#ifdef USE_NGHTTP2 + if(proto.size == NGHTTP2_PROTO_VERSION_ID_LEN && + !memcmp(NGHTTP2_PROTO_VERSION_ID, proto.data, + NGHTTP2_PROTO_VERSION_ID_LEN)) { + conn->negnpn = CURL_HTTP_VERSION_2; + } + else +#endif + if(proto.size == ALPN_HTTP_1_1_LENGTH && + !memcmp(ALPN_HTTP_1_1, proto.data, ALPN_HTTP_1_1_LENGTH)) { + conn->negnpn = CURL_HTTP_VERSION_1_1; + } + } + else + infof(data, "ALPN, server did not agree to a protocol\n"); + } +#endif + + conn->ssl[sockindex].state = ssl_connection_complete; + conn->recv[sockindex] = gtls_recv; + conn->send[sockindex] = gtls_send; + + if(SSL_SET_OPTION(primary.sessionid)) { + /* we always unconditionally get the session id here, as even if we + already got it from the cache and asked to use it in the connection, it + might've been rejected and then a new one is in use now and we need to + detect that. */ + bool incache; + void *ssl_sessionid; + void *connect_sessionid; + size_t connect_idsize = 0; + + /* get the session ID data size */ + gnutls_session_get_data(session, NULL, &connect_idsize); + connect_sessionid = malloc(connect_idsize); /* get a buffer for it */ + + if(connect_sessionid) { + /* extract session ID to the allocated buffer */ + gnutls_session_get_data(session, connect_sessionid, &connect_idsize); + + Curl_ssl_sessionid_lock(conn); + incache = !(Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL, + sockindex)); + if(incache) { + /* there was one before in the cache, so instead of risking that the + previous one was rejected, we just kill that and store the new */ + Curl_ssl_delsessionid(conn, ssl_sessionid); + } + + /* store this session id */ + result = Curl_ssl_addsessionid(conn, connect_sessionid, connect_idsize, + sockindex); + Curl_ssl_sessionid_unlock(conn); + if(result) { + free(connect_sessionid); + result = CURLE_OUT_OF_MEMORY; + } + } + else + result = CURLE_OUT_OF_MEMORY; + } + + return result; +} + + +/* + * This function is called after the TCP connect has completed. Setup the TLS + * layer and do all necessary magic. + */ +/* We use connssl->connecting_state to keep track of the connection status; + there are three states: 'ssl_connect_1' (not started yet or complete), + 'ssl_connect_2_reading' (waiting for data from server), and + 'ssl_connect_2_writing' (waiting to be able to write). + */ +static CURLcode +gtls_connect_common(struct connectdata *conn, + int sockindex, + bool nonblocking, + bool *done) +{ + int rc; + struct ssl_connect_data *connssl = &conn->ssl[sockindex]; + + /* Initiate the connection, if not already done */ + if(ssl_connect_1 == connssl->connecting_state) { + rc = gtls_connect_step1(conn, sockindex); + if(rc) + return rc; + } + + rc = handshake(conn, sockindex, TRUE, nonblocking); + if(rc) + /* handshake() sets its own error message with failf() */ + return rc; + + /* Finish connecting once the handshake is done */ + if(ssl_connect_1 == connssl->connecting_state) { + rc = gtls_connect_step3(conn, sockindex); + if(rc) + return rc; + } + + *done = ssl_connect_1 == connssl->connecting_state; + + return CURLE_OK; +} + +static CURLcode Curl_gtls_connect_nonblocking(struct connectdata *conn, + int sockindex, bool *done) +{ + return gtls_connect_common(conn, sockindex, TRUE, done); +} + +static CURLcode Curl_gtls_connect(struct connectdata *conn, int sockindex) +{ + CURLcode result; + bool done = FALSE; + + result = gtls_connect_common(conn, sockindex, FALSE, &done); + if(result) + return result; + + DEBUGASSERT(done); + + return CURLE_OK; +} + +static bool Curl_gtls_data_pending(const struct connectdata *conn, + int connindex) +{ + const struct ssl_connect_data *connssl = &conn->ssl[connindex]; + bool res = FALSE; + if(BACKEND->session && + 0 != gnutls_record_check_pending(BACKEND->session)) + res = TRUE; + + connssl = &conn->proxy_ssl[connindex]; + if(BACKEND->session && + 0 != gnutls_record_check_pending(BACKEND->session)) + res = TRUE; + + return res; +} + +static ssize_t gtls_send(struct connectdata *conn, + int sockindex, + const void *mem, + size_t len, + CURLcode *curlcode) +{ + struct ssl_connect_data *connssl = &conn->ssl[sockindex]; + ssize_t rc = gnutls_record_send(BACKEND->session, mem, len); + + if(rc < 0) { + *curlcode = (rc == GNUTLS_E_AGAIN) + ? CURLE_AGAIN + : CURLE_SEND_ERROR; + + rc = -1; + } + + return rc; +} + +static void close_one(struct ssl_connect_data *connssl) +{ + if(BACKEND->session) { + gnutls_bye(BACKEND->session, GNUTLS_SHUT_RDWR); + gnutls_deinit(BACKEND->session); + BACKEND->session = NULL; + } + if(BACKEND->cred) { + gnutls_certificate_free_credentials(BACKEND->cred); + BACKEND->cred = NULL; + } +#ifdef USE_TLS_SRP + if(BACKEND->srp_client_cred) { + gnutls_srp_free_client_credentials(BACKEND->srp_client_cred); + BACKEND->srp_client_cred = NULL; + } +#endif +} + +static void Curl_gtls_close(struct connectdata *conn, int sockindex) +{ + close_one(&conn->ssl[sockindex]); + close_one(&conn->proxy_ssl[sockindex]); +} + +/* + * This function is called to shut down the SSL layer but keep the + * socket open (CCC - Clear Command Channel) + */ +static int Curl_gtls_shutdown(struct connectdata *conn, int sockindex) +{ + struct ssl_connect_data *connssl = &conn->ssl[sockindex]; + ssize_t result; + int retval = 0; + struct Curl_easy *data = conn->data; + bool done = FALSE; + char buf[120]; + + /* This has only been tested on the proftpd server, and the mod_tls code + sends a close notify alert without waiting for a close notify alert in + response. Thus we wait for a close notify alert from the server, but + we do not send one. Let's hope other servers do the same... */ + + if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE) + gnutls_bye(BACKEND->session, GNUTLS_SHUT_WR); + + if(BACKEND->session) { + while(!done) { + int what = SOCKET_READABLE(conn->sock[sockindex], + SSL_SHUTDOWN_TIMEOUT); + if(what > 0) { + /* Something to read, let's do it and hope that it is the close + notify alert from the server */ + result = gnutls_record_recv(BACKEND->session, + buf, sizeof(buf)); + switch(result) { + case 0: + /* This is the expected response. There was no data but only + the close notify alert */ + done = TRUE; + break; + case GNUTLS_E_AGAIN: + case GNUTLS_E_INTERRUPTED: + infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n"); + break; + default: + retval = -1; + done = TRUE; + break; + } + } + else if(0 == what) { + /* timeout */ + failf(data, "SSL shutdown timeout"); + done = TRUE; + } + else { + /* anything that gets here is fatally bad */ + failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO); + retval = -1; + done = TRUE; + } + } + gnutls_deinit(BACKEND->session); + } + gnutls_certificate_free_credentials(BACKEND->cred); + +#ifdef USE_TLS_SRP + if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP + && SSL_SET_OPTION(username) != NULL) + gnutls_srp_free_client_credentials(BACKEND->srp_client_cred); +#endif + + BACKEND->cred = NULL; + BACKEND->session = NULL; + + return retval; +} + +static ssize_t gtls_recv(struct connectdata *conn, /* connection data */ + int num, /* socketindex */ + char *buf, /* store read data here */ + size_t buffersize, /* max amount to read */ + CURLcode *curlcode) +{ + struct ssl_connect_data *connssl = &conn->ssl[num]; + ssize_t ret; + + ret = gnutls_record_recv(BACKEND->session, buf, buffersize); + if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) { + *curlcode = CURLE_AGAIN; + return -1; + } + + if(ret == GNUTLS_E_REHANDSHAKE) { + /* BLOCKING call, this is bad but a work-around for now. Fixing this "the + proper way" takes a whole lot of work. */ + CURLcode result = handshake(conn, num, FALSE, FALSE); + if(result) + /* handshake() writes error message on its own */ + *curlcode = result; + else + *curlcode = CURLE_AGAIN; /* then return as if this was a wouldblock */ + return -1; + } + + if(ret < 0) { + failf(conn->data, "GnuTLS recv error (%d): %s", + + (int)ret, gnutls_strerror((int)ret)); + *curlcode = CURLE_RECV_ERROR; + return -1; + } + + return ret; +} + +static void Curl_gtls_session_free(void *ptr) +{ + free(ptr); +} + +static size_t Curl_gtls_version(char *buffer, size_t size) +{ + return snprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL)); +} + +#ifndef USE_GNUTLS_NETTLE +static int Curl_gtls_seed(struct Curl_easy *data) +{ + /* we have the "SSL is seeded" boolean static to prevent multiple + time-consuming seedings in vain */ + static bool ssl_seeded = FALSE; + + /* Quickly add a bit of entropy */ + gcry_fast_random_poll(); + + if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] || + data->set.str[STRING_SSL_EGDSOCKET]) { + + /* TODO: to a good job seeding the RNG + This may involve the gcry_control function and these options: + GCRYCTL_SET_RANDOM_SEED_FILE + GCRYCTL_SET_RNDEGD_SOCKET + */ + ssl_seeded = TRUE; + } + return 0; +} +#endif + +/* data might be NULL! */ +static CURLcode Curl_gtls_random(struct Curl_easy *data, + unsigned char *entropy, size_t length) +{ +#if defined(USE_GNUTLS_NETTLE) + int rc; + (void)data; + rc = gnutls_rnd(GNUTLS_RND_RANDOM, entropy, length); + return rc?CURLE_FAILED_INIT:CURLE_OK; +#elif defined(USE_GNUTLS) + if(data) + Curl_gtls_seed(data); /* Initiate the seed if not already done */ + gcry_randomize(entropy, length, GCRY_STRONG_RANDOM); +#endif + return CURLE_OK; +} + +static CURLcode Curl_gtls_md5sum(unsigned char *tmp, /* input */ + size_t tmplen, + unsigned char *md5sum, /* output */ + size_t md5len) +{ +#if defined(USE_GNUTLS_NETTLE) + struct md5_ctx MD5pw; + md5_init(&MD5pw); + md5_update(&MD5pw, (unsigned int)tmplen, tmp); + md5_digest(&MD5pw, (unsigned int)md5len, md5sum); +#elif defined(USE_GNUTLS) + gcry_md_hd_t MD5pw; + gcry_md_open(&MD5pw, GCRY_MD_MD5, 0); + gcry_md_write(MD5pw, tmp, tmplen); + memcpy(md5sum, gcry_md_read(MD5pw, 0), md5len); + gcry_md_close(MD5pw); +#endif + return CURLE_OK; +} + +static CURLcode Curl_gtls_sha256sum(const unsigned char *tmp, /* input */ + size_t tmplen, + unsigned char *sha256sum, /* output */ + size_t sha256len) +{ +#if defined(USE_GNUTLS_NETTLE) + struct sha256_ctx SHA256pw; + sha256_init(&SHA256pw); + sha256_update(&SHA256pw, (unsigned int)tmplen, tmp); + sha256_digest(&SHA256pw, (unsigned int)sha256len, sha256sum); +#elif defined(USE_GNUTLS) + gcry_md_hd_t SHA256pw; + gcry_md_open(&SHA256pw, GCRY_MD_SHA256, 0); + gcry_md_write(SHA256pw, tmp, tmplen); + memcpy(sha256sum, gcry_md_read(SHA256pw, 0), sha256len); + gcry_md_close(SHA256pw); +#endif + return CURLE_OK; +} + +static bool Curl_gtls_cert_status_request(void) +{ +#ifdef HAS_OCSP + return TRUE; +#else + return FALSE; +#endif +} + +static void *Curl_gtls_get_internals(struct ssl_connect_data *connssl, + CURLINFO info UNUSED_PARAM) +{ + (void)info; + return BACKEND->session; +} + +const struct Curl_ssl Curl_ssl_gnutls = { + { CURLSSLBACKEND_GNUTLS, "gnutls" }, /* info */ + + SSLSUPP_CA_PATH | + SSLSUPP_CERTINFO | + SSLSUPP_PINNEDPUBKEY | + SSLSUPP_HTTPS_PROXY, + + sizeof(struct ssl_backend_data), + + Curl_gtls_init, /* init */ + Curl_gtls_cleanup, /* cleanup */ + Curl_gtls_version, /* version */ + Curl_none_check_cxn, /* check_cxn */ + Curl_gtls_shutdown, /* shutdown */ + Curl_gtls_data_pending, /* data_pending */ + Curl_gtls_random, /* random */ + Curl_gtls_cert_status_request, /* cert_status_request */ + Curl_gtls_connect, /* connect */ + Curl_gtls_connect_nonblocking, /* connect_nonblocking */ + Curl_gtls_get_internals, /* get_internals */ + Curl_gtls_close, /* close_one */ + Curl_none_close_all, /* close_all */ + Curl_gtls_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_gtls_md5sum, /* md5sum */ + Curl_gtls_sha256sum /* sha256sum */ +}; + +#endif /* USE_GNUTLS */ |