/* * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * ECC cipher suite support in OpenSSL originally developed by * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */ #include #include "e_os.h" #ifndef NO_SYS_TYPES_H # include #endif #include "internal/o_dir.h" #include #include #include #include #include #include #include #include "ssl_locl.h" #include "internal/thread_once.h" static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex); static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT; static volatile int ssl_x509_store_ctx_idx = -1; DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init) { ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0, "SSL for verify callback", NULL, NULL, NULL); return ssl_x509_store_ctx_idx >= 0; } int SSL_get_ex_data_X509_STORE_CTX_idx(void) { if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init)) return -1; return ssl_x509_store_ctx_idx; } CERT *ssl_cert_new(void) { CERT *ret = OPENSSL_zalloc(sizeof(*ret)); if (ret == NULL) { SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE); return NULL; } ret->key = &(ret->pkeys[SSL_PKEY_RSA_ENC]); ret->references = 1; ret->sec_cb = ssl_security_default_callback; ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL; ret->sec_ex = NULL; ret->lock = CRYPTO_THREAD_lock_new(); if (ret->lock == NULL) { SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE); OPENSSL_free(ret); return NULL; } return ret; } CERT *ssl_cert_dup(CERT *cert) { CERT *ret = OPENSSL_zalloc(sizeof(*ret)); int i; if (ret == NULL) { SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); return NULL; } ret->references = 1; ret->key = &ret->pkeys[cert->key - cert->pkeys]; ret->lock = CRYPTO_THREAD_lock_new(); if (ret->lock == NULL) { SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); OPENSSL_free(ret); return NULL; } #ifndef OPENSSL_NO_DH if (cert->dh_tmp != NULL) { ret->dh_tmp = cert->dh_tmp; EVP_PKEY_up_ref(ret->dh_tmp); } ret->dh_tmp_cb = cert->dh_tmp_cb; ret->dh_tmp_auto = cert->dh_tmp_auto; #endif for (i = 0; i < SSL_PKEY_NUM; i++) { CERT_PKEY *cpk = cert->pkeys + i; CERT_PKEY *rpk = ret->pkeys + i; if (cpk->x509 != NULL) { rpk->x509 = cpk->x509; X509_up_ref(rpk->x509); } if (cpk->privatekey != NULL) { rpk->privatekey = cpk->privatekey; EVP_PKEY_up_ref(cpk->privatekey); } if (cpk->chain) { rpk->chain = X509_chain_up_ref(cpk->chain); if (!rpk->chain) { SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); goto err; } } if (cert->pkeys[i].serverinfo != NULL) { /* Just copy everything. */ ret->pkeys[i].serverinfo = OPENSSL_malloc(cert->pkeys[i].serverinfo_length); if (ret->pkeys[i].serverinfo == NULL) { SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); goto err; } ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length; memcpy(ret->pkeys[i].serverinfo, cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length); } } /* Configured sigalgs copied across */ if (cert->conf_sigalgs) { ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen); if (ret->conf_sigalgs == NULL) goto err; memcpy(ret->conf_sigalgs, cert->conf_sigalgs, cert->conf_sigalgslen); ret->conf_sigalgslen = cert->conf_sigalgslen; } else ret->conf_sigalgs = NULL; if (cert->client_sigalgs) { ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen); if (ret->client_sigalgs == NULL) goto err; memcpy(ret->client_sigalgs, cert->client_sigalgs, cert->client_sigalgslen); ret->client_sigalgslen = cert->client_sigalgslen; } else ret->client_sigalgs = NULL; /* Shared sigalgs also NULL */ ret->shared_sigalgs = NULL; /* Copy any custom client certificate types */ if (cert->ctypes) { ret->ctypes = OPENSSL_malloc(cert->ctype_num); if (ret->ctypes == NULL) goto err; memcpy(ret->ctypes, cert->ctypes, cert->ctype_num); ret->ctype_num = cert->ctype_num; } ret->cert_flags = cert->cert_flags; ret->cert_cb = cert->cert_cb; ret->cert_cb_arg = cert->cert_cb_arg; if (cert->verify_store) { X509_STORE_up_ref(cert->verify_store); ret->verify_store = cert->verify_store; } if (cert->chain_store) { X509_STORE_up_ref(cert->chain_store); ret->chain_store = cert->chain_store; } ret->sec_cb = cert->sec_cb; ret->sec_level = cert->sec_level; ret->sec_ex = cert->sec_ex; if (!custom_exts_copy(&ret->cli_ext, &cert->cli_ext)) goto err; if (!custom_exts_copy(&ret->srv_ext, &cert->srv_ext)) goto err; #ifndef OPENSSL_NO_PSK if (cert->psk_identity_hint) { ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint); if (ret->psk_identity_hint == NULL) goto err; } #endif return ret; err: ssl_cert_free(ret); return NULL; } /* Free up and clear all certificates and chains */ void ssl_cert_clear_certs(CERT *c) { int i; if (c == NULL) return; for (i = 0; i < SSL_PKEY_NUM; i++) { CERT_PKEY *cpk = c->pkeys + i; X509_free(cpk->x509); cpk->x509 = NULL; EVP_PKEY_free(cpk->privatekey); cpk->privatekey = NULL; sk_X509_pop_free(cpk->chain, X509_free); cpk->chain = NULL; OPENSSL_free(cpk->serverinfo); cpk->serverinfo = NULL; cpk->serverinfo_length = 0; } } void ssl_cert_free(CERT *c) { int i; if (c == NULL) return; CRYPTO_DOWN_REF(&c->references, &i, c->lock); REF_PRINT_COUNT("CERT", c); if (i > 0) return; REF_ASSERT_ISNT(i < 0); #ifndef OPENSSL_NO_DH EVP_PKEY_free(c->dh_tmp); #endif ssl_cert_clear_certs(c); OPENSSL_free(c->conf_sigalgs); OPENSSL_free(c->client_sigalgs); OPENSSL_free(c->shared_sigalgs); OPENSSL_free(c->ctypes); X509_STORE_free(c->verify_store); X509_STORE_free(c->chain_store); custom_exts_free(&c->cli_ext); custom_exts_free(&c->srv_ext); #ifndef OPENSSL_NO_PSK OPENSSL_free(c->psk_identity_hint); #endif CRYPTO_THREAD_lock_free(c->lock); OPENSSL_free(c); } int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain) { int i, r; CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key; if (!cpk) return 0; for (i = 0; i < sk_X509_num(chain); i++) { r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0); if (r != 1) { SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r); return 0; } } sk_X509_pop_free(cpk->chain, X509_free); cpk->chain = chain; return 1; } int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain) { STACK_OF(X509) *dchain; if (!chain) return ssl_cert_set0_chain(s, ctx, NULL); dchain = X509_chain_up_ref(chain); if (!dchain) return 0; if (!ssl_cert_set0_chain(s, ctx, dchain)) { sk_X509_pop_free(dchain, X509_free); return 0; } return 1; } int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x) { int r; CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key; if (!cpk) return 0; r = ssl_security_cert(s, ctx, x, 0, 0); if (r != 1) { SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r); return 0; } if (!cpk->chain) cpk->chain = sk_X509_new_null(); if (!cpk->chain || !sk_X509_push(cpk->chain, x)) return 0; return 1; } int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x) { if (!ssl_cert_add0_chain_cert(s, ctx, x)) return 0; X509_up_ref(x); return 1; } int ssl_cert_select_current(CERT *c, X509 *x) { int i; if (x == NULL) return 0; for (i = 0; i < SSL_PKEY_NUM; i++) { CERT_PKEY *cpk = c->pkeys + i; if (cpk->x509 == x && cpk->privatekey) { c->key = cpk; return 1; } } for (i = 0; i < SSL_PKEY_NUM; i++) { CERT_PKEY *cpk = c->pkeys + i; if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) { c->key = cpk; return 1; } } return 0; } int ssl_cert_set_current(CERT *c, long op) { int i, idx; if (!c) return 0; if (op == SSL_CERT_SET_FIRST) idx = 0; else if (op == SSL_CERT_SET_NEXT) { idx = (int)(c->key - c->pkeys + 1); if (idx >= SSL_PKEY_NUM) return 0; } else return 0; for (i = idx; i < SSL_PKEY_NUM; i++) { CERT_PKEY *cpk = c->pkeys + i; if (cpk->x509 && cpk->privatekey) { c->key = cpk; return 1; } } return 0; } void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg) { c->cert_cb = cb; c->cert_cb_arg = arg; } int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk) { X509 *x; int i = 0; X509_STORE *verify_store; X509_STORE_CTX *ctx = NULL; X509_VERIFY_PARAM *param; if ((sk == NULL) || (sk_X509_num(sk) == 0)) return 0; if (s->cert->verify_store) verify_store = s->cert->verify_store; else verify_store = s->ctx->cert_store; ctx = X509_STORE_CTX_new(); if (ctx == NULL) { SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE); return 0; } x = sk_X509_value(sk, 0); if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) { SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB); goto end; } param = X509_STORE_CTX_get0_param(ctx); /* * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some * point, for now a single @SECLEVEL sets the same policy for TLS crypto * and PKI authentication. */ X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s)); /* Set suite B flags if needed */ X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s)); if (!X509_STORE_CTX_set_ex_data (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) { goto end; } /* Verify via DANE if enabled */ if (DANETLS_ENABLED(&s->dane)) X509_STORE_CTX_set0_dane(ctx, &s->dane); /* * We need to inherit the verify parameters. These can be determined by * the context: if its a server it will verify SSL client certificates or * vice versa. */ X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server"); /* * Anything non-default in "s->param" should overwrite anything in the ctx. */ X509_VERIFY_PARAM_set1(param, s->param); if (s->verify_callback) X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback); if (s->ctx->app_verify_callback != NULL) i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg); else i = X509_verify_cert(ctx); s->verify_result = X509_STORE_CTX_get_error(ctx); sk_X509_pop_free(s->verified_chain, X509_free); s->verified_chain = NULL; if (X509_STORE_CTX_get0_chain(ctx) != NULL) { s->verified_chain = X509_STORE_CTX_get1_chain(ctx); if (s->verified_chain == NULL) { SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE); i = 0; } } /* Move peername from the store context params to the SSL handle's */ X509_VERIFY_PARAM_move_peername(s->param, param); end: X509_STORE_CTX_free(ctx); return i; } static void set_client_CA_list(STACK_OF(X509_NAME) **ca_list, STACK_OF(X509_NAME) *name_list) { sk_X509_NAME_pop_free(*ca_list, X509_NAME_free); *ca_list = name_list; } STACK_OF(X509_NAME) *SSL_dup_CA_list(STACK_OF(X509_NAME) *sk) { int i; STACK_OF(X509_NAME) *ret; X509_NAME *name; ret = sk_X509_NAME_new_null(); if (ret == NULL) { SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE); return NULL; } for (i = 0; i < sk_X509_NAME_num(sk); i++) { name = X509_NAME_dup(sk_X509_NAME_value(sk, i)); if (name == NULL || !sk_X509_NAME_push(ret, name)) { sk_X509_NAME_pop_free(ret, X509_NAME_free); X509_NAME_free(name); return NULL; } } return (ret); } void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list) { set_client_CA_list(&(s->client_CA), name_list); } void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list) { set_client_CA_list(&(ctx->client_CA), name_list); } STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx) { return (ctx->client_CA); } STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s) { if (!s->server) { /* we are in the client */ if (((s->version >> 8) == SSL3_VERSION_MAJOR) && (s->s3 != NULL)) return (s->s3->tmp.ca_names); else return (NULL); } else { if (s->client_CA != NULL) return (s->client_CA); else return (s->ctx->client_CA); } } static int add_client_CA(STACK_OF(X509_NAME) **sk, X509 *x) { X509_NAME *name; if (x == NULL) return (0); if ((*sk == NULL) && ((*sk = sk_X509_NAME_new_null()) == NULL)) return (0); if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL) return (0); if (!sk_X509_NAME_push(*sk, name)) { X509_NAME_free(name); return (0); } return (1); } int SSL_add_client_CA(SSL *ssl, X509 *x) { return (add_client_CA(&(ssl->client_CA), x)); } int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x) { return (add_client_CA(&(ctx->client_CA), x)); } static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b) { return (X509_NAME_cmp(*a, *b)); } static int xname_cmp(const X509_NAME *a, const X509_NAME *b) { return X509_NAME_cmp(a, b); } static unsigned long xname_hash(const X509_NAME *a) { return X509_NAME_hash((X509_NAME *)a); } /** * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed; * it doesn't really have anything to do with clients (except that a common use * for a stack of CAs is to send it to the client). Actually, it doesn't have * much to do with CAs, either, since it will load any old cert. * \param file the file containing one or more certs. * \return a ::STACK containing the certs. */ STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file) { BIO *in = BIO_new(BIO_s_file()); X509 *x = NULL; X509_NAME *xn = NULL; STACK_OF(X509_NAME) *ret = NULL; LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp); if ((name_hash == NULL) || (in == NULL)) { SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE); goto err; } if (!BIO_read_filename(in, file)) goto err; for (;;) { if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) break; if (ret == NULL) { ret = sk_X509_NAME_new_null(); if (ret == NULL) { SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE); goto err; } } if ((xn = X509_get_subject_name(x)) == NULL) goto err; /* check for duplicates */ xn = X509_NAME_dup(xn); if (xn == NULL) goto err; if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) { /* Duplicate. */ X509_NAME_free(xn); xn = NULL; } else { lh_X509_NAME_insert(name_hash, xn); if (!sk_X509_NAME_push(ret, xn)) goto err; } } goto done; err: X509_NAME_free(xn); sk_X509_NAME_pop_free(ret, X509_NAME_free); ret = NULL; done: BIO_free(in); X509_free(x); lh_X509_NAME_free(name_hash); if (ret != NULL) ERR_clear_error(); return (ret); } /** * Add a file of certs to a stack. * \param stack the stack to add to. * \param file the file to add from. All certs in this file that are not * already in the stack will be added. * \return 1 for success, 0 for failure. Note that in the case of failure some * certs may have been added to \c stack. */ int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack, const char *file) { BIO *in; X509 *x = NULL; X509_NAME *xn = NULL; int ret = 1; int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b); oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp); in = BIO_new(BIO_s_file()); if (in == NULL) { SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE); goto err; } if (!BIO_read_filename(in, file)) goto err; for (;;) { if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) break; if ((xn = X509_get_subject_name(x)) == NULL) goto err; xn = X509_NAME_dup(xn); if (xn == NULL) goto err; if (sk_X509_NAME_find(stack, xn) >= 0) { /* Duplicate. */ X509_NAME_free(xn); } else if (!sk_X509_NAME_push(stack, xn)) { X509_NAME_free(xn); goto err; } } ERR_clear_error(); goto done; err: ret = 0; done: BIO_free(in); X509_free(x); (void)sk_X509_NAME_set_cmp_func(stack, oldcmp); return ret; } /** * Add a directory of certs to a stack. * \param stack the stack to append to. * \param dir the directory to append from. All files in this directory will be * examined as potential certs. Any that are acceptable to * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be * included. * \return 1 for success, 0 for failure. Note that in the case of failure some * certs may have been added to \c stack. */ int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack, const char *dir) { OPENSSL_DIR_CTX *d = NULL; const char *filename; int ret = 0; /* Note that a side effect is that the CAs will be sorted by name */ while ((filename = OPENSSL_DIR_read(&d, dir))) { char buf[1024]; int r; if (strlen(dir) + strlen(filename) + 2 > sizeof buf) { SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, SSL_R_PATH_TOO_LONG); goto err; } #ifdef OPENSSL_SYS_VMS r = BIO_snprintf(buf, sizeof buf, "%s%s", dir, filename); #else r = BIO_snprintf(buf, sizeof buf, "%s/%s", dir, filename); #endif if (r <= 0 || r >= (int)sizeof(buf)) goto err; if (!SSL_add_file_cert_subjects_to_stack(stack, buf)) goto err; } if (errno) { SYSerr(SYS_F_OPENDIR, get_last_sys_error()); ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')"); SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB); goto err; } ret = 1; err: if (d) OPENSSL_DIR_end(&d); return ret; } /* Add a certificate to the WPACKET */ static int ssl_add_cert_to_buf(WPACKET *pkt, X509 *x) { int len; unsigned char *outbytes; len = i2d_X509(x, NULL); if (len < 0) { SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB); return 0; } if (!WPACKET_sub_allocate_bytes_u24(pkt, len, &outbytes) || i2d_X509(x, &outbytes) != len) { SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_INTERNAL_ERROR); return 0; } return 1; } /* Add certificate chain to internal SSL BUF_MEM structure */ int ssl_add_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk) { int i, chain_count; X509 *x; STACK_OF(X509) *extra_certs; STACK_OF(X509) *chain = NULL; X509_STORE *chain_store; if (cpk == NULL || cpk->x509 == NULL) return 1; x = cpk->x509; /* * If we have a certificate specific chain use it, else use parent ctx. */ if (cpk->chain) extra_certs = cpk->chain; else extra_certs = s->ctx->extra_certs; if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs) chain_store = NULL; else if (s->cert->chain_store) chain_store = s->cert->chain_store; else chain_store = s->ctx->cert_store; if (chain_store) { X509_STORE_CTX *xs_ctx = X509_STORE_CTX_new(); if (xs_ctx == NULL) { SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_MALLOC_FAILURE); return (0); } if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) { X509_STORE_CTX_free(xs_ctx); SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_X509_LIB); return (0); } /* * It is valid for the chain not to be complete (because normally we * don't include the root cert in the chain). Therefore we deliberately * ignore the error return from this call. We're not actually verifying * the cert - we're just building as much of the chain as we can */ (void)X509_verify_cert(xs_ctx); /* Don't leave errors in the queue */ ERR_clear_error(); chain = X509_STORE_CTX_get0_chain(xs_ctx); i = ssl_security_cert_chain(s, chain, NULL, 0); if (i != 1) { #if 0 /* Dummy error calls so mkerr generates them */ SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_EE_KEY_TOO_SMALL); SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_KEY_TOO_SMALL); SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_MD_TOO_WEAK); #endif X509_STORE_CTX_free(xs_ctx); SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i); return 0; } chain_count = sk_X509_num(chain); for (i = 0; i < chain_count; i++) { x = sk_X509_value(chain, i); if (!ssl_add_cert_to_buf(pkt, x)) { X509_STORE_CTX_free(xs_ctx); return 0; } } X509_STORE_CTX_free(xs_ctx); } else { i = ssl_security_cert_chain(s, extra_certs, x, 0); if (i != 1) { SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i); return 0; } if (!ssl_add_cert_to_buf(pkt, x)) return 0; for (i = 0; i < sk_X509_num(extra_certs); i++) { x = sk_X509_value(extra_certs, i); if (!ssl_add_cert_to_buf(pkt, x)) return 0; } } return 1; } /* Build a certificate chain for current certificate */ int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags) { CERT *c = s ? s->cert : ctx->cert; CERT_PKEY *cpk = c->key; X509_STORE *chain_store = NULL; X509_STORE_CTX *xs_ctx = NULL; STACK_OF(X509) *chain = NULL, *untrusted = NULL; X509 *x; int i, rv = 0; unsigned long error; if (!cpk->x509) { SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET); goto err; } /* Rearranging and check the chain: add everything to a store */ if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) { chain_store = X509_STORE_new(); if (chain_store == NULL) goto err; for (i = 0; i < sk_X509_num(cpk->chain); i++) { x = sk_X509_value(cpk->chain, i); if (!X509_STORE_add_cert(chain_store, x)) { error = ERR_peek_last_error(); if (ERR_GET_LIB(error) != ERR_LIB_X509 || ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) goto err; ERR_clear_error(); } } /* Add EE cert too: it might be self signed */ if (!X509_STORE_add_cert(chain_store, cpk->x509)) { error = ERR_peek_last_error(); if (ERR_GET_LIB(error) != ERR_LIB_X509 || ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) goto err; ERR_clear_error(); } } else { if (c->chain_store) chain_store = c->chain_store; else if (s) chain_store = s->ctx->cert_store; else chain_store = ctx->cert_store; if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED) untrusted = cpk->chain; } xs_ctx = X509_STORE_CTX_new(); if (xs_ctx == NULL) { SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE); goto err; } if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) { SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB); goto err; } /* Set suite B flags if needed */ X509_STORE_CTX_set_flags(xs_ctx, c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS); i = X509_verify_cert(xs_ctx); if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) { if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR) ERR_clear_error(); i = 1; rv = 2; } if (i > 0) chain = X509_STORE_CTX_get1_chain(xs_ctx); if (i <= 0) { SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED); i = X509_STORE_CTX_get_error(xs_ctx); ERR_add_error_data(2, "Verify error:", X509_verify_cert_error_string(i)); goto err; } /* Remove EE certificate from chain */ x = sk_X509_shift(chain); X509_free(x); if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) { if (sk_X509_num(chain) > 0) { /* See if last cert is self signed */ x = sk_X509_value(chain, sk_X509_num(chain) - 1); if (X509_get_extension_flags(x) & EXFLAG_SS) { x = sk_X509_pop(chain); X509_free(x); } } } /* * Check security level of all CA certificates: EE will have been checked * already. */ for (i = 0; i < sk_X509_num(chain); i++) { x = sk_X509_value(chain, i); rv = ssl_security_cert(s, ctx, x, 0, 0); if (rv != 1) { SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv); sk_X509_pop_free(chain, X509_free); rv = 0; goto err; } } sk_X509_pop_free(cpk->chain, X509_free); cpk->chain = chain; if (rv == 0) rv = 1; err: if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) X509_STORE_free(chain_store); X509_STORE_CTX_free(xs_ctx); return rv; } int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref) { X509_STORE **pstore; if (chain) pstore = &c->chain_store; else pstore = &c->verify_store; X509_STORE_free(*pstore); *pstore = store; if (ref && store) X509_STORE_up_ref(store); return 1; } static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex) { int level, minbits; static const int minbits_table[5] = { 80, 112, 128, 192, 256 }; if (ctx) level = SSL_CTX_get_security_level(ctx); else level = SSL_get_security_level(s); if (level <= 0) { /* * No EDH keys weaker than 1024-bits even at level 0, otherwise, * anything goes. */ if (op == SSL_SECOP_TMP_DH && bits < 80) return 0; return 1; } if (level > 5) level = 5; minbits = minbits_table[level - 1]; switch (op) { case SSL_SECOP_CIPHER_SUPPORTED: case SSL_SECOP_CIPHER_SHARED: case SSL_SECOP_CIPHER_CHECK: { const SSL_CIPHER *c = other; /* No ciphers below security level */ if (bits < minbits) return 0; /* No unauthenticated ciphersuites */ if (c->algorithm_auth & SSL_aNULL) return 0; /* No MD5 mac ciphersuites */ if (c->algorithm_mac & SSL_MD5) return 0; /* SHA1 HMAC is 160 bits of security */ if (minbits > 160 && c->algorithm_mac & SSL_SHA1) return 0; /* Level 2: no RC4 */ if (level >= 2 && c->algorithm_enc == SSL_RC4) return 0; /* Level 3: forward secure ciphersuites only */ if (level >= 3 && !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH))) return 0; break; } case SSL_SECOP_VERSION: if (!SSL_IS_DTLS(s)) { /* SSLv3 not allowed at level 2 */ if (nid <= SSL3_VERSION && level >= 2) return 0; /* TLS v1.1 and above only for level 3 */ if (nid <= TLS1_VERSION && level >= 3) return 0; /* TLS v1.2 only for level 4 and above */ if (nid <= TLS1_1_VERSION && level >= 4) return 0; } else { /* DTLS v1.2 only for level 4 and above */ if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4) return 0; } break; case SSL_SECOP_COMPRESSION: if (level >= 2) return 0; break; case SSL_SECOP_TICKET: if (level >= 3) return 0; break; default: if (bits < minbits) return 0; } return 1; } int ssl_security(const SSL *s, int op, int bits, int nid, void *other) { return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex); } int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other) { return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other, ctx->cert->sec_ex); }