/* tls_openssl.c ** strophe XMPP client library -- TLS abstraction openssl impl. ** ** Copyright (C) 2005-008 Collecta, Inc. ** ** This software is provided AS-IS with no warranty, either express ** or implied. ** ** This program is dual licensed under the MIT and GPLv3 licenses. */ /** @file * TLS implementation with OpenSSL. */ #include /* EINTR */ #include #ifndef _WIN32 #include #else #include #endif #include #include #include #include #include "common.h" #include "tls.h" #include "sock.h" /* * Redefine OPENSSL_VERSION_NUMBER for LibreSSL. * LibreSSL and OpenSSL use different and incompatible version schemes. Solve * this issue in the way how nginx project did. */ #if (defined LIBRESSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER == 0x20000000L) #undef OPENSSL_VERSION_NUMBER #if (LIBRESSL_VERSION_NUMBER >= 0x2080000fL) #define OPENSSL_VERSION_NUMBER 0x1010000fL #elif (LIBRESSL_VERSION_NUMBER >= 0x2070000fL) #define OPENSSL_VERSION_NUMBER 0x1000200fL #else #define OPENSSL_VERSION_NUMBER 0x1000107fL #endif #endif #if OPENSSL_VERSION_NUMBER < 0x10100000L static const unsigned char *ASN1_STRING_get0_data(ASN1_STRING *asn1) { return ASN1_STRING_data(asn1); } #endif #if OPENSSL_VERSION_NUMBER < 0x10000000L static int GENERAL_NAME_get0_otherName(const GENERAL_NAME *gen, ASN1_OBJECT **poid, ASN1_TYPE **pvalue) { if (gen->type != GEN_OTHERNAME) return 0; if (poid) *poid = gen->d.otherName->type_id; if (pvalue) *pvalue = gen->d.otherName->value; return 1; } #endif struct _tls { xmpp_ctx_t *ctx; sock_t sock; SSL_CTX *ssl_ctx; SSL *ssl; X509 *client_cert; int lasterror; }; enum { TLS_SHUTDOWN_MAX_RETRIES = 10, TLS_TIMEOUT_SEC = 0, TLS_TIMEOUT_USEC = 100000, }; static void _tls_sock_wait(tls_t *tls, int error); static const char *_tls_error_str(int error, const char **tbl, size_t tbl_size); static void _tls_set_error(tls_t *tls, int error); static void _tls_log_error(xmpp_ctx_t *ctx); static void _tls_dump_cert_info(tls_t *tls); static X509 *_tls_cert_read(xmpp_conn_t *conn); static int _tls_xaddr_nid(void); static int _tls_name_to_xmppaddr(GENERAL_NAME *name, char **res); static GENERAL_NAMES *_tls_cert_get_names(xmpp_conn_t *conn); #define TLS_ERROR_STR(error, table) \ _tls_error_str(error, table, ARRAY_SIZE(table)) #define TLS_ERROR_FIELD(x) [x] = #x const char *tls_errors[] = { TLS_ERROR_FIELD(SSL_ERROR_NONE), TLS_ERROR_FIELD(SSL_ERROR_SSL), TLS_ERROR_FIELD(SSL_ERROR_WANT_READ), TLS_ERROR_FIELD(SSL_ERROR_WANT_WRITE), TLS_ERROR_FIELD(SSL_ERROR_WANT_X509_LOOKUP), TLS_ERROR_FIELD(SSL_ERROR_SYSCALL), TLS_ERROR_FIELD(SSL_ERROR_ZERO_RETURN), TLS_ERROR_FIELD(SSL_ERROR_WANT_CONNECT), TLS_ERROR_FIELD(SSL_ERROR_WANT_ACCEPT), #ifndef LIBRESSL_VERSION_NUMBER #if OPENSSL_VERSION_NUMBER >= 0x10100000L TLS_ERROR_FIELD(SSL_ERROR_WANT_ASYNC), TLS_ERROR_FIELD(SSL_ERROR_WANT_ASYNC_JOB), #endif #if OPENSSL_VERSION_NUMBER >= 0x10101000L TLS_ERROR_FIELD(SSL_ERROR_WANT_CLIENT_HELLO_CB), #endif #endif /* !LIBRESSL_VERSION_NUMBER */ }; const char *cert_errors[] = { TLS_ERROR_FIELD(X509_V_OK), #if OPENSSL_VERSION_NUMBER >= 0x10002000L TLS_ERROR_FIELD(X509_V_ERR_UNSPECIFIED), #endif TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_GET_CRL), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY), TLS_ERROR_FIELD(X509_V_ERR_CERT_SIGNATURE_FAILURE), TLS_ERROR_FIELD(X509_V_ERR_CRL_SIGNATURE_FAILURE), TLS_ERROR_FIELD(X509_V_ERR_CERT_NOT_YET_VALID), TLS_ERROR_FIELD(X509_V_ERR_CERT_HAS_EXPIRED), TLS_ERROR_FIELD(X509_V_ERR_CRL_NOT_YET_VALID), TLS_ERROR_FIELD(X509_V_ERR_CRL_HAS_EXPIRED), TLS_ERROR_FIELD(X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD), TLS_ERROR_FIELD(X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD), TLS_ERROR_FIELD(X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD), TLS_ERROR_FIELD(X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD), TLS_ERROR_FIELD(X509_V_ERR_OUT_OF_MEM), TLS_ERROR_FIELD(X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT), TLS_ERROR_FIELD(X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE), TLS_ERROR_FIELD(X509_V_ERR_CERT_CHAIN_TOO_LONG), TLS_ERROR_FIELD(X509_V_ERR_CERT_REVOKED), TLS_ERROR_FIELD(X509_V_ERR_INVALID_CA), TLS_ERROR_FIELD(X509_V_ERR_PATH_LENGTH_EXCEEDED), TLS_ERROR_FIELD(X509_V_ERR_INVALID_PURPOSE), TLS_ERROR_FIELD(X509_V_ERR_CERT_UNTRUSTED), TLS_ERROR_FIELD(X509_V_ERR_CERT_REJECTED), TLS_ERROR_FIELD(X509_V_ERR_SUBJECT_ISSUER_MISMATCH), TLS_ERROR_FIELD(X509_V_ERR_AKID_SKID_MISMATCH), TLS_ERROR_FIELD(X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH), TLS_ERROR_FIELD(X509_V_ERR_KEYUSAGE_NO_CERTSIGN), TLS_ERROR_FIELD(X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER), TLS_ERROR_FIELD(X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION), TLS_ERROR_FIELD(X509_V_ERR_KEYUSAGE_NO_CRL_SIGN), TLS_ERROR_FIELD(X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION), TLS_ERROR_FIELD(X509_V_ERR_INVALID_NON_CA), TLS_ERROR_FIELD(X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED), TLS_ERROR_FIELD(X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE), TLS_ERROR_FIELD(X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED), TLS_ERROR_FIELD(X509_V_ERR_INVALID_EXTENSION), TLS_ERROR_FIELD(X509_V_ERR_INVALID_POLICY_EXTENSION), TLS_ERROR_FIELD(X509_V_ERR_NO_EXPLICIT_POLICY), TLS_ERROR_FIELD(X509_V_ERR_APPLICATION_VERIFICATION), #if OPENSSL_VERSION_NUMBER >= 0x10002000L TLS_ERROR_FIELD(X509_V_ERR_DIFFERENT_CRL_SCOPE), TLS_ERROR_FIELD(X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE), TLS_ERROR_FIELD(X509_V_ERR_UNNESTED_RESOURCE), TLS_ERROR_FIELD(X509_V_ERR_PERMITTED_VIOLATION), TLS_ERROR_FIELD(X509_V_ERR_EXCLUDED_VIOLATION), TLS_ERROR_FIELD(X509_V_ERR_SUBTREE_MINMAX), TLS_ERROR_FIELD(X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE), TLS_ERROR_FIELD(X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX), TLS_ERROR_FIELD(X509_V_ERR_UNSUPPORTED_NAME_SYNTAX), TLS_ERROR_FIELD(X509_V_ERR_CRL_PATH_VALIDATION_ERROR), #ifndef LIBRESSL_VERSION_NUMBER TLS_ERROR_FIELD(X509_V_ERR_SUITE_B_INVALID_VERSION), TLS_ERROR_FIELD(X509_V_ERR_SUITE_B_INVALID_ALGORITHM), TLS_ERROR_FIELD(X509_V_ERR_SUITE_B_INVALID_CURVE), TLS_ERROR_FIELD(X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM), TLS_ERROR_FIELD(X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED), TLS_ERROR_FIELD(X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256), #endif /* !LIBRESSL_VERSION_NUMBER */ TLS_ERROR_FIELD(X509_V_ERR_HOSTNAME_MISMATCH), TLS_ERROR_FIELD(X509_V_ERR_EMAIL_MISMATCH), TLS_ERROR_FIELD(X509_V_ERR_IP_ADDRESS_MISMATCH), #endif /* OPENSSL_VERSION_NUMBER >= 0x10002000L */ #if OPENSSL_VERSION_NUMBER >= 0x10100000L TLS_ERROR_FIELD(X509_V_ERR_INVALID_CALL), TLS_ERROR_FIELD(X509_V_ERR_STORE_LOOKUP), #ifndef LIBRESSL_VERSION_NUMBER TLS_ERROR_FIELD(X509_V_ERR_PATH_LOOP), TLS_ERROR_FIELD(X509_V_ERR_DANE_NO_MATCH), TLS_ERROR_FIELD(X509_V_ERR_EE_KEY_TOO_SMALL), TLS_ERROR_FIELD(X509_V_ERR_CA_KEY_TOO_SMALL), TLS_ERROR_FIELD(X509_V_ERR_CA_MD_TOO_WEAK), TLS_ERROR_FIELD(X509_V_ERR_NO_VALID_SCTS), TLS_ERROR_FIELD(X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION), TLS_ERROR_FIELD(X509_V_ERR_OCSP_VERIFY_NEEDED), TLS_ERROR_FIELD(X509_V_ERR_OCSP_VERIFY_FAILED), TLS_ERROR_FIELD(X509_V_ERR_OCSP_CERT_UNKNOWN), #endif /* !LIBRESSL_VERSION_NUMBER */ #endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */ }; #undef TLS_ERROR_FIELD void tls_initialize(void) { #if OPENSSL_VERSION_NUMBER < 0x10100000L SSL_library_init(); SSL_load_error_strings(); #else OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL); #endif /* init xmppAddr OID */ _tls_xaddr_nid(); } void tls_shutdown(void) { /* * FIXME: Don't free global tables, program or other libraries may use * openssl after libstrophe finalization. Maybe better leak some fixed * memory rather than cause random crashes of the main program. */ #if OPENSSL_VERSION_NUMBER < 0x10100000L OBJ_cleanup(); ERR_free_strings(); EVP_cleanup(); CRYPTO_cleanup_all_ex_data(); #if OPENSSL_VERSION_NUMBER >= 0x10002000L SSL_COMP_free_compression_methods(); #endif #if OPENSSL_VERSION_NUMBER < 0x10000000L ERR_remove_state(0); #else ERR_remove_thread_state(NULL); #endif #endif } int tls_error(tls_t *tls) { return tls->lasterror; } /** Search through the SubjectAlternativeNames and return the next * id-on-xmppAddr element starting from `n`. */ char *tls_id_on_xmppaddr(xmpp_conn_t *conn, unsigned int n) { char *ret = NULL; int i, j; GENERAL_NAMES *names = _tls_cert_get_names(conn); if (!names) return NULL; int num_names = sk_GENERAL_NAME_num(names); for (i = j = 0; i < num_names; ++i) { char *res; GENERAL_NAME *name = sk_GENERAL_NAME_value(names, i); if (name == NULL) break; if (_tls_name_to_xmppaddr(name, &res)) continue; if (j == (int)n) { xmpp_debug(conn->ctx, "tls", "extracted jid %s from id-on-xmppAddr", res); ret = xmpp_strdup(conn->ctx, res); OPENSSL_free(res); break; } j++; OPENSSL_free(res); } GENERAL_NAMES_free(names); return ret; } unsigned int tls_id_on_xmppaddr_num(xmpp_conn_t *conn) { unsigned int ret = 0; GENERAL_NAMES *names = _tls_cert_get_names(conn); if (!names) return 0; int j, num_names = sk_GENERAL_NAME_num(names); for (j = 0; j < num_names; ++j) { GENERAL_NAME *name = sk_GENERAL_NAME_value(names, j); if (_tls_name_to_xmppaddr(name, NULL)) continue; ret++; } GENERAL_NAMES_free(names); return ret; } tls_t *tls_new(xmpp_conn_t *conn) { tls_t *tls = xmpp_alloc(conn->ctx, sizeof(*tls)); int mode; if (tls) { int ret; #if OPENSSL_VERSION_NUMBER >= 0x10002000L /* Hostname verification is supported in OpenSSL 1.0.2 and newer. */ X509_VERIFY_PARAM *param; #endif memset(tls, 0, sizeof(*tls)); tls->ctx = conn->ctx; tls->sock = conn->sock; #if OPENSSL_VERSION_NUMBER < 0x10100000L tls->ssl_ctx = SSL_CTX_new(SSLv23_client_method()); #else tls->ssl_ctx = SSL_CTX_new(TLS_client_method()); #endif if (tls->ssl_ctx == NULL) goto err; /* Enable bug workarounds. */ SSL_CTX_set_options(tls->ssl_ctx, SSL_OP_ALL); /* Disable insecure SSL/TLS versions. */ SSL_CTX_set_options(tls->ssl_ctx, SSL_OP_NO_SSLv2); /* DROWN */ SSL_CTX_set_options(tls->ssl_ctx, SSL_OP_NO_SSLv3); /* POODLE */ SSL_CTX_set_options(tls->ssl_ctx, SSL_OP_NO_TLSv1); /* BEAST */ if (conn->tls_client_cert && conn->tls_client_key) { tls->client_cert = _tls_cert_read(conn); if (!tls->client_cert) { xmpp_error(tls->ctx, "tls", "could not read client certificate"); goto err_free_ctx; } SSL_CTX_use_certificate_file(tls->ssl_ctx, conn->tls_client_cert, SSL_FILETYPE_PEM); SSL_CTX_use_PrivateKey_file(tls->ssl_ctx, conn->tls_client_key, SSL_FILETYPE_PEM); } else { /* If the server asks for a client certificate, don't send one. */ SSL_CTX_set_client_cert_cb(tls->ssl_ctx, NULL); } SSL_CTX_set_mode(tls->ssl_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE); ret = SSL_CTX_set_default_verify_paths(tls->ssl_ctx); if (ret == 0 && !conn->tls_trust) { /* * Returns 1 on success and 0 on failure. A missing default * location is still treated as a success. * Ignore errors when XMPP_CONN_FLAG_TRUST_TLS is set. */ xmpp_error(tls->ctx, "tls", "SSL_CTX_set_default_verify_paths() failed"); goto err_free_cert; } tls->ssl = SSL_new(tls->ssl_ctx); if (tls->ssl == NULL) goto err_free_cert; #if OPENSSL_VERSION_NUMBER >= 0x0908060L && !defined(OPENSSL_NO_TLSEXT) /* Enable SNI. */ SSL_set_tlsext_host_name(tls->ssl, conn->domain); #endif /* Trust server's certificate when user sets the flag explicitly. */ mode = conn->tls_trust ? SSL_VERIFY_NONE : SSL_VERIFY_PEER; SSL_set_verify(tls->ssl, mode, NULL); #if OPENSSL_VERSION_NUMBER >= 0x10002000L /* Hostname verification is supported in OpenSSL 1.0.2 and newer. */ param = SSL_get0_param(tls->ssl); /* * Allow only complete wildcards. RFC 6125 discourages wildcard usage * completely, and lists internationalized domain names as a reason * against partial wildcards. * See https://tools.ietf.org/html/rfc6125#section-7.2 for more * information. */ X509_VERIFY_PARAM_set_hostflags(param, X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS); X509_VERIFY_PARAM_set1_host(param, conn->domain, 0); #endif ret = SSL_set_fd(tls->ssl, conn->sock); if (ret <= 0) goto err_free_ssl; } return tls; err_free_ssl: SSL_free(tls->ssl); err_free_cert: X509_free(tls->client_cert); err_free_ctx: SSL_CTX_free(tls->ssl_ctx); err: xmpp_free(conn->ctx, tls); _tls_log_error(conn->ctx); return NULL; } void tls_free(tls_t *tls) { SSL_free(tls->ssl); X509_free(tls->client_cert); SSL_CTX_free(tls->ssl_ctx); xmpp_free(tls->ctx, tls); } int tls_set_credentials(tls_t *tls, const char *cafilename) { UNUSED(tls); UNUSED(cafilename); return -1; } int tls_start(tls_t *tls) { int error; int ret; long x509_res; /* Since we're non-blocking, loop the connect call until it succeeds or fails */ while (1) { ret = SSL_connect(tls->ssl); error = ret <= 0 ? SSL_get_error(tls->ssl, ret) : 0; if (ret == -1 && tls_is_recoverable(error)) { /* wait for something to happen on the sock before looping back */ _tls_sock_wait(tls, error); continue; } /* success or fatal error */ break; } x509_res = SSL_get_verify_result(tls->ssl); if (x509_res == X509_V_OK) { xmpp_debug(tls->ctx, "tls", "Certificate verification passed"); } else { xmpp_debug(tls->ctx, "tls", "Certificate verification FAILED, result=%s(%ld)", TLS_ERROR_STR((int)x509_res, cert_errors), x509_res); } _tls_dump_cert_info(tls); _tls_set_error(tls, error); return ret <= 0 ? 0 : 1; } int tls_stop(tls_t *tls) { int retries = 0; int error; int ret; /* According to OpenSSL.org, we must not call SSL_shutdown(3) if a previous fatal error has occurred on a connection. */ if (tls->lasterror == SSL_ERROR_SYSCALL || tls->lasterror == SSL_ERROR_SSL) return 1; while (1) { ++retries; ret = SSL_shutdown(tls->ssl); error = ret < 0 ? SSL_get_error(tls->ssl, ret) : 0; if (ret == 1 || !tls_is_recoverable(error) || retries >= TLS_SHUTDOWN_MAX_RETRIES) { break; } _tls_sock_wait(tls, error); } if (error == SSL_ERROR_SYSCALL && errno == 0) { /* * Handle special case when peer closes connection instead of * proper shutdown. */ error = 0; ret = 1; } _tls_set_error(tls, error); return ret <= 0 ? 0 : 1; } int tls_is_recoverable(int error) { return (error == SSL_ERROR_NONE || error == SSL_ERROR_WANT_READ || error == SSL_ERROR_WANT_WRITE || error == SSL_ERROR_WANT_CONNECT || error == SSL_ERROR_WANT_ACCEPT); } int tls_pending(tls_t *tls) { return SSL_pending(tls->ssl); } int tls_read(tls_t *tls, void *buff, size_t len) { int ret; ret = SSL_read(tls->ssl, buff, len); _tls_set_error(tls, ret <= 0 ? SSL_get_error(tls->ssl, ret) : 0); return ret; } int tls_write(tls_t *tls, const void *buff, size_t len) { int ret; ret = SSL_write(tls->ssl, buff, len); _tls_set_error(tls, ret <= 0 ? SSL_get_error(tls->ssl, ret) : 0); return ret; } int tls_clear_pending_write(tls_t *tls) { UNUSED(tls); return 0; } static void _tls_sock_wait(tls_t *tls, int error) { struct timeval tv; fd_set rfds; fd_set wfds; int nfds; int ret; if (error == SSL_ERROR_NONE) return; FD_ZERO(&rfds); FD_ZERO(&wfds); if (error == SSL_ERROR_WANT_READ) FD_SET(tls->sock, &rfds); if (error == SSL_ERROR_WANT_WRITE) FD_SET(tls->sock, &wfds); nfds = (error == SSL_ERROR_WANT_READ || error == SSL_ERROR_WANT_WRITE) ? tls->sock + 1 : 0; do { tv.tv_sec = TLS_TIMEOUT_SEC; tv.tv_usec = TLS_TIMEOUT_USEC; ret = select(nfds, &rfds, &wfds, NULL, &tv); } while (ret == -1 && errno == EINTR); } static const char *_tls_error_str(int error, const char **tbl, size_t tbl_size) { return (error >= 0 && (size_t)error < tbl_size) ? tbl[error] : "UNKNOWN"; } static void _tls_set_error(tls_t *tls, int error) { if (error != 0 && !tls_is_recoverable(error)) { xmpp_debug(tls->ctx, "tls", "error=%s(%d) errno=%d", TLS_ERROR_STR(error, tls_errors), error, errno); _tls_log_error(tls->ctx); } tls->lasterror = error; } static void _tls_log_error(xmpp_ctx_t *ctx) { unsigned long e; char buf[256]; do { e = ERR_get_error(); if (e != 0) { ERR_error_string_n(e, buf, sizeof(buf)); xmpp_debug(ctx, "tls", "%s", buf); } } while (e != 0); } static void _tls_dump_cert_info(tls_t *tls) { X509 *cert; char *name; cert = SSL_get_peer_certificate(tls->ssl); if (cert == NULL) xmpp_debug(tls->ctx, "tls", "Certificate was not presented by peer"); else { name = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0); if (name != NULL) { xmpp_debug(tls->ctx, "tls", "Subject=%s", name); OPENSSL_free(name); } name = X509_NAME_oneline(X509_get_issuer_name(cert), NULL, 0); if (name != NULL) { xmpp_debug(tls->ctx, "tls", "Issuer=%s", name); OPENSSL_free(name); } X509_free(cert); } } static X509 *_tls_cert_read(xmpp_conn_t *conn) { if (conn->tls && conn->tls->client_cert) return conn->tls->client_cert; BIO *f = BIO_new_file(conn->tls_client_cert, "r"); if (!f) { xmpp_debug(conn->ctx, "tls", "f == NULL"); return NULL; } X509 *c = PEM_read_bio_X509(f, NULL, NULL, NULL); BIO_free(f); if (!c) { unsigned long error; while ((error = ERR_get_error()) != 0) { xmpp_debug(conn->ctx, "tls", "c == NULL: %s", ERR_error_string(error, NULL)); } } return c; } static int _tls_xaddr_nid(void) { static int xaddr_nid = NID_undef; if (xaddr_nid == NID_undef) { xaddr_nid = OBJ_sn2nid("id-on-xmppAddr"); } if (xaddr_nid == NID_undef) { xaddr_nid = OBJ_create("1.3.6.1.5.5.7.8.5", "id-on-xmppAddr", "XmppAddr Identifier"); } return xaddr_nid; } static GENERAL_NAMES *_tls_cert_get_names(xmpp_conn_t *conn) { X509 *client_cert; GENERAL_NAMES *names = NULL; client_cert = _tls_cert_read(conn); if (!client_cert) return NULL; int san = X509_get_ext_by_NID(client_cert, NID_subject_alt_name, 0); X509_EXTENSION *san_ext = X509_get_ext(client_cert, san); if (!san_ext) goto OUT; ASN1_OCTET_STRING *data = X509_EXTENSION_get_data(san_ext); if (!data) goto OUT; const unsigned char *d = ASN1_STRING_get0_data(data); if (!d) goto OUT; names = d2i_GENERAL_NAMES(NULL, &d, ASN1_STRING_length(data)); OUT: if (!conn->tls || !conn->tls->client_cert) X509_free(client_cert); return names; } /** Convert GENERAL_NAME* to a string * * This checks whether the GENERAL_NAME* that is given has the * correct id-on-xmppAddr set and then optionally converts this * form ASN.1 to a string/char*. * * When `res` pointer is set to NULL this method doesn't allocate * the result but only checks whether it is in the correct format. * * @param name Pointer to the GENERAL_NAME that shall be converted * @param res Result-pointer (optional, can be NULL) * * @return classic Unix style - 0=success, 1=error */ static int _tls_name_to_xmppaddr(GENERAL_NAME *name, char **res) { ASN1_OBJECT *oid; ASN1_TYPE *val; if (!name || name->type != GEN_OTHERNAME) return 1; if (GENERAL_NAME_get0_otherName(name, &oid, &val) == 0) return 1; if (OBJ_obj2nid(oid) != _tls_xaddr_nid() || !val) return 1; if (!res) return 0; if (ASN1_STRING_to_UTF8((unsigned char **)res, val->value.asn1_string) < 0) return 1; return 0; }