Move some libssl global variables into SSL_CTX

disabled_enc_mask et al were global. Now that cipher loading is done
individually for each SSL_CTX, based on the libctx configured for that
SSL_CTX this means that some things will be disabled for one SSL_CTX but
not for another. The global variables set up the potential for different
SSL_CTXs to trample on each other. We move these variables into the SSL_CTX
structure.

Fixes #12040
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13465)

ssl/ssl_ciph.c

@@ -319,18 +319,12 @@ static int get_optional_pkey_id(const char *pkey_name)
 
 #endif
 
-/* masks of disabled algorithms */
-static uint32_t disabled_enc_mask;
-static uint32_t disabled_mac_mask;
-static uint32_t disabled_mkey_mask;
-static uint32_t disabled_auth_mask;
-
 int ssl_load_ciphers(SSL_CTX *ctx)
 {
     size_t i;
     const ssl_cipher_table *t;
 
-    disabled_enc_mask = 0;
+    ctx->disabled_enc_mask = 0;
     for (i = 0, t = ssl_cipher_table_cipher; i < SSL_ENC_NUM_IDX; i++, t++) {
         if (t->nid != NID_undef) {
             const EVP_CIPHER *cipher
@@ -338,17 +332,17 @@ int ssl_load_ciphers(SSL_CTX *ctx)
 
             ctx->ssl_cipher_methods[i] = cipher;
             if (cipher == NULL)
-                disabled_enc_mask |= t->mask;
+                ctx->disabled_enc_mask |= t->mask;
         }
     }
-    disabled_mac_mask = 0;
+    ctx->disabled_mac_mask = 0;
     for (i = 0, t = ssl_cipher_table_mac; i < SSL_MD_NUM_IDX; i++, t++) {
         const EVP_MD *md
             = ssl_evp_md_fetch(ctx->libctx, t->nid, ctx->propq);
 
         ctx->ssl_digest_methods[i] = md;
         if (md == NULL) {
-            disabled_mac_mask |= t->mask;
+            ctx->disabled_mac_mask |= t->mask;
         } else {
             int tmpsize = EVP_MD_size(md);
             if (!ossl_assert(tmpsize >= 0))
@@ -357,29 +351,29 @@ int ssl_load_ciphers(SSL_CTX *ctx)
         }
     }
 
-    disabled_mkey_mask = 0;
-    disabled_auth_mask = 0;
+    ctx->disabled_mkey_mask = 0;
+    ctx->disabled_auth_mask = 0;
 
 #ifdef OPENSSL_NO_RSA
-    disabled_mkey_mask |= SSL_kRSA | SSL_kRSAPSK;
-    disabled_auth_mask |= SSL_aRSA;
+    ctx->disabled_mkey_mask |= SSL_kRSA | SSL_kRSAPSK;
+    dctx->isabled_auth_mask |= SSL_aRSA;
 #endif
 #ifdef OPENSSL_NO_DSA
-    disabled_auth_mask |= SSL_aDSS;
+    ctx->disabled_auth_mask |= SSL_aDSS;
 #endif
 #ifdef OPENSSL_NO_DH
-    disabled_mkey_mask |= SSL_kDHE | SSL_kDHEPSK;
+    ctx->disabled_mkey_mask |= SSL_kDHE | SSL_kDHEPSK;
 #endif
 #ifdef OPENSSL_NO_EC
-    disabled_mkey_mask |= SSL_kECDHE | SSL_kECDHEPSK;
-    disabled_auth_mask |= SSL_aECDSA;
+    ctx->disabled_mkey_mask |= SSL_kECDHE | SSL_kECDHEPSK;
+    ctx->disabled_auth_mask |= SSL_aECDSA;
 #endif
 #ifdef OPENSSL_NO_PSK
-    disabled_mkey_mask |= SSL_PSK;
-    disabled_auth_mask |= SSL_aPSK;
+    ctx->disabled_mkey_mask |= SSL_PSK;
+    ctx->disabled_auth_mask |= SSL_aPSK;
 #endif
 #ifdef OPENSSL_NO_SRP
-    disabled_mkey_mask |= SSL_kSRP;
+    ctx->disabled_mkey_mask |= SSL_kSRP;
 #endif
 
     /*
@@ -390,44 +384,44 @@ int ssl_load_ciphers(SSL_CTX *ctx)
     if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX])
         ctx->ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX] = 32;
     else
-        disabled_mac_mask |= SSL_GOST89MAC;
+        ctx->disabled_mac_mask |= SSL_GOST89MAC;
 
     ssl_mac_pkey_id[SSL_MD_GOST89MAC12_IDX] =
         get_optional_pkey_id(SN_gost_mac_12);
     if (ssl_mac_pkey_id[SSL_MD_GOST89MAC12_IDX])
         ctx->ssl_mac_secret_size[SSL_MD_GOST89MAC12_IDX] = 32;
     else
-        disabled_mac_mask |= SSL_GOST89MAC12;
+        ctx->disabled_mac_mask |= SSL_GOST89MAC12;
 
     ssl_mac_pkey_id[SSL_MD_MAGMAOMAC_IDX] =
         get_optional_pkey_id(SN_magma_mac);
     if (ssl_mac_pkey_id[SSL_MD_MAGMAOMAC_IDX])
         ctx->ssl_mac_secret_size[SSL_MD_MAGMAOMAC_IDX] = 32;
     else
-        disabled_mac_mask |= SSL_MAGMAOMAC;
+        ctx->disabled_mac_mask |= SSL_MAGMAOMAC;
 
     ssl_mac_pkey_id[SSL_MD_KUZNYECHIKOMAC_IDX] =
         get_optional_pkey_id(SN_kuznyechik_mac);
     if (ssl_mac_pkey_id[SSL_MD_KUZNYECHIKOMAC_IDX])
         ctx->ssl_mac_secret_size[SSL_MD_KUZNYECHIKOMAC_IDX] = 32;
     else
-        disabled_mac_mask |= SSL_KUZNYECHIKOMAC;
+        ctx->disabled_mac_mask |= SSL_KUZNYECHIKOMAC;
 
     if (!get_optional_pkey_id(SN_id_GostR3410_2001))
-        disabled_auth_mask |= SSL_aGOST01 | SSL_aGOST12;
+        ctx->disabled_auth_mask |= SSL_aGOST01 | SSL_aGOST12;
     if (!get_optional_pkey_id(SN_id_GostR3410_2012_256))
-        disabled_auth_mask |= SSL_aGOST12;
+        ctx->disabled_auth_mask |= SSL_aGOST12;
     if (!get_optional_pkey_id(SN_id_GostR3410_2012_512))
-        disabled_auth_mask |= SSL_aGOST12;
+        ctx->disabled_auth_mask |= SSL_aGOST12;
     /*
      * Disable GOST key exchange if no GOST signature algs are available *
      */
-    if ((disabled_auth_mask & (SSL_aGOST01 | SSL_aGOST12)) ==
+    if ((ctx->disabled_auth_mask & (SSL_aGOST01 | SSL_aGOST12)) ==
         (SSL_aGOST01 | SSL_aGOST12))
-        disabled_mkey_mask |= SSL_kGOST;
+        ctx->disabled_mkey_mask |= SSL_kGOST;
 
-    if ((disabled_auth_mask & SSL_aGOST12) ==  SSL_aGOST12)
-        disabled_mkey_mask |= SSL_kGOST18;
+    if ((ctx->disabled_auth_mask & SSL_aGOST12) ==  SSL_aGOST12)
+        ctx->disabled_mkey_mask |= SSL_kGOST18;
 
     return 1;
 }
@@ -1417,7 +1411,7 @@ int SSL_set_ciphersuites(SSL *s, const char *str)
     return ret;
 }
 
-STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
+STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(SSL_CTX *ctx,
                                              STACK_OF(SSL_CIPHER) *tls13_ciphersuites,
                                              STACK_OF(SSL_CIPHER) **cipher_list,
                                              STACK_OF(SSL_CIPHER) **cipher_list_by_id,
@@ -1430,6 +1424,7 @@ STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
     const char *rule_p;
     CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
     const SSL_CIPHER **ca_list = NULL;
+    const SSL_METHOD *ssl_method = ctx->method;
 
     /*
      * Return with error if nothing to do.
@@ -1446,10 +1441,10 @@ STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
      * in algorithms, so we first get the mask of disabled ciphers.
      */
 
-    disabled_mkey = disabled_mkey_mask;
-    disabled_auth = disabled_auth_mask;
-    disabled_enc = disabled_enc_mask;
-    disabled_mac = disabled_mac_mask;
+    disabled_mkey = ctx->disabled_mkey_mask;
+    disabled_auth = ctx->disabled_auth_mask;
+    disabled_enc = ctx->disabled_enc_mask;
+    disabled_mac = ctx->disabled_mac_mask;
 
     /*
      * Now we have to collect the available ciphers from the compiled
@@ -1622,7 +1617,7 @@ STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
         if ((sslc->algorithm_enc & disabled_enc) != 0
                 || (ssl_cipher_table_mac[sslc->algorithm2
                                          & SSL_HANDSHAKE_MAC_MASK].mask
-                    & disabled_mac_mask) != 0)
+                    & ctx->disabled_mac_mask) != 0)
             continue;
 
         if (!sk_SSL_CIPHER_push(cipherstack, sslc)) {
@@ -2185,11 +2180,11 @@ int ssl_cipher_get_overhead(const SSL_CIPHER *c, size_t *mac_overhead,
     return 1;
 }
 
-int ssl_cert_is_disabled(size_t idx)
+int ssl_cert_is_disabled(SSL_CTX *ctx, size_t idx)
 {
     const SSL_CERT_LOOKUP *cl = ssl_cert_lookup_by_idx(idx);
 
-    if (cl == NULL || (cl->amask & disabled_auth_mask) != 0)
+    if (cl == NULL || (cl->amask & ctx->disabled_auth_mask) != 0)
         return 1;
     return 0;
 }

ssl/ssl_lib.c

@@ -656,7 +656,7 @@ int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
         ERR_raise(ERR_LIB_SSL, SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
         return 0;
     }
-    sk = ssl_create_cipher_list(ctx->method,
+    sk = ssl_create_cipher_list(ctx,
                                 ctx->tls13_ciphersuites,
                                 &(ctx->cipher_list),
                                 &(ctx->cipher_list_by_id),
@@ -2701,7 +2701,7 @@ int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
 {
     STACK_OF(SSL_CIPHER) *sk;
 
-    sk = ssl_create_cipher_list(ctx->method, ctx->tls13_ciphersuites,
+    sk = ssl_create_cipher_list(ctx, ctx->tls13_ciphersuites,
                                 &ctx->cipher_list, &ctx->cipher_list_by_id, str,
                                 ctx->cert);
     /*
@@ -2725,7 +2725,7 @@ int SSL_set_cipher_list(SSL *s, const char *str)
 {
     STACK_OF(SSL_CIPHER) *sk;
 
-    sk = ssl_create_cipher_list(s->ctx->method, s->tls13_ciphersuites,
+    sk = ssl_create_cipher_list(s->ctx, s->tls13_ciphersuites,
                                 &s->cipher_list, &s->cipher_list_by_id, str,
                                 s->cert);
     /* see comment in SSL_CTX_set_cipher_list */
@@ -3190,7 +3190,7 @@ SSL_CTX *SSL_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq,
     if (!SSL_CTX_set_ciphersuites(ret, OSSL_default_ciphersuites()))
         goto err;
 
-    if (!ssl_create_cipher_list(ret->method,
+    if (!ssl_create_cipher_list(ret,
                                 ret->tls13_ciphersuites,
                                 &ret->cipher_list, &ret->cipher_list_by_id,
                                 OSSL_default_cipher_list(), ret->cert)

ssl/ssl_local.h

@@ -1187,6 +1187,12 @@ struct ssl_ctx_st {
     TLS_GROUP_INFO *group_list;
     size_t group_list_len;
     size_t group_list_max_len;
+
+    /* masks of disabled algorithms */
+    uint32_t disabled_enc_mask;
+    uint32_t disabled_mac_mask;
+    uint32_t disabled_mkey_mask;
+    uint32_t disabled_auth_mask;
 };
 
 typedef struct cert_pkey_st CERT_PKEY;
@@ -2389,7 +2395,7 @@ __owur int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b);
 DECLARE_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER, ssl_cipher_id);
 __owur int ssl_cipher_ptr_id_cmp(const SSL_CIPHER *const *ap,
                                  const SSL_CIPHER *const *bp);
-__owur STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method,
+__owur STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(SSL_CTX *ctx,
                                                     STACK_OF(SSL_CIPHER) *tls13_ciphersuites,
                                                     STACK_OF(SSL_CIPHER) **cipher_list,
                                                     STACK_OF(SSL_CIPHER) **cipher_list_by_id,
@@ -2410,7 +2416,7 @@ __owur int ssl_cipher_get_evp(SSL_CTX *ctxc, const SSL_SESSION *s,
 __owur int ssl_cipher_get_overhead(const SSL_CIPHER *c, size_t *mac_overhead,
                                    size_t *int_overhead, size_t *blocksize,
                                    size_t *ext_overhead);
-__owur int ssl_cert_is_disabled(size_t idx);
+__owur int ssl_cert_is_disabled(SSL_CTX *ctx, size_t idx);
 __owur const SSL_CIPHER *ssl_get_cipher_by_char(SSL *ssl,
                                                 const unsigned char *ptr,
                                                 int all);

ssl/t1_lib.c

@@ -2050,7 +2050,7 @@ static int tls12_sigalg_allowed(const SSL *s, int op, const SIGALG_LOOKUP *lu)
         return 0;
 
     /* See if public key algorithm allowed */
-    if (ssl_cert_is_disabled(lu->sig_idx))
+    if (ssl_cert_is_disabled(s->ctx, lu->sig_idx))
         return 0;
 
     if (lu->sig == NID_id_GostR3410_2012_256
@@ -2307,7 +2307,7 @@ int tls1_process_sigalgs(SSL *s)
         if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
             continue;
         /* If not disabled indicate we can explicitly sign */
-        if (pvalid[idx] == 0 && !ssl_cert_is_disabled(idx))
+        if (pvalid[idx] == 0 && !ssl_cert_is_disabled(s->ctx, idx))
             pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN | CERT_PKEY_SIGN;
     }
     return 1;