Revision of custom extension code.
authorDr. Stephen Henson <steve@openssl.org>
Tue, 5 Aug 2014 14:21:36 +0000 (15:21 +0100)
committerDr. Stephen Henson <steve@openssl.org>
Fri, 15 Aug 2014 11:20:04 +0000 (12:20 +0100)
Move custom extension structures from SSL_CTX to CERT structure.

This change means the form can be revised in future without binary
compatibility issues. Also since CERT is part of SSL structures
so per-SSL custom extensions could be supported in future as well as
per SSL_CTX.
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Emilia Käsper <emilia@openssl.org>
ssl/s23_clnt.c
ssl/ssl.h
ssl/ssl_cert.c
ssl/ssl_lib.c
ssl/ssl_locl.h
ssl/t1_lib.c

index 0865485..903f128 100644 (file)
@@ -368,7 +368,7 @@ static int ssl23_client_hello(SSL *s)
                if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
                        ssl2_compat = 0;
 #endif
-               if (s->ctx->custom_cli_ext_records_count != 0)
+               if (s->cert->custom_cli_ext_records_count != 0)
                        ssl2_compat = 0;
                }
 #endif
index 376dd69..dc18255 100644 (file)
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -425,20 +425,6 @@ typedef int (*custom_srv_ext_second_cb_fn)(SSL *s, unsigned short ext_type,
                                           const unsigned char **out,
                                           unsigned short *outlen, int *al, void *arg);
 
-typedef struct {
-       unsigned short ext_type;
-       custom_cli_ext_first_cb_fn fn1; 
-       custom_cli_ext_second_cb_fn fn2; 
-       void *arg;
-} custom_cli_ext_record;
-
-typedef struct {
-       unsigned short ext_type;
-       custom_srv_ext_first_cb_fn fn1; 
-       custom_srv_ext_second_cb_fn fn2; 
-       void *arg;
-} custom_srv_ext_record;
-
 #endif
 
 #ifndef OPENSSL_NO_SSL_INTERN
@@ -1160,11 +1146,6 @@ struct ssl_ctx_st
        size_t tlsext_ellipticcurvelist_length;
        unsigned char *tlsext_ellipticcurvelist;
 # endif /* OPENSSL_NO_EC */
-       /* Arrays containing the callbacks for custom TLS Extensions. */
-       custom_cli_ext_record *custom_cli_ext_records;
-       size_t custom_cli_ext_records_count;
-       custom_srv_ext_record *custom_srv_ext_records;
-       size_t custom_srv_ext_records_count;
        };
 
 #endif
index 4e75a96..4504958 100644 (file)
@@ -423,6 +423,27 @@ CERT *ssl_cert_dup(CERT *cert)
        ret->sec_level = cert->sec_level;
        ret->sec_ex = cert->sec_ex;
 
+#ifndef OPENSSL_NO_TLSEXT
+       if (cert->custom_cli_ext_records_count)
+               {
+               ret->custom_cli_ext_records = BUF_memdup(cert->custom_cli_ext_records, sizeof(custom_cli_ext_record) * cert->custom_cli_ext_records_count);
+               if (ret->custom_cli_ext_records == NULL)
+                       goto err;
+               ret->custom_cli_ext_records_count =
+                                       cert->custom_cli_ext_records_count;
+               }
+
+       if (cert->custom_srv_ext_records_count)
+               {
+               ret->custom_srv_ext_records = BUF_memdup(cert->custom_srv_ext_records, sizeof(custom_srv_ext_record) * cert->custom_srv_ext_records_count);
+               if (ret->custom_srv_ext_records == NULL)
+                       goto err;
+               ret->custom_srv_ext_records_count =
+                                       cert->custom_srv_ext_records_count;
+               }
+
+#endif
+
        return(ret);
        
 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_ECDH)
@@ -441,6 +462,13 @@ err:
                EC_KEY_free(ret->ecdh_tmp);
 #endif
 
+#ifndef OPENSSL_NO_TLSEXT
+       if (ret->custom_cli_ext_records)
+               OPENSSL_free(ret->custom_cli_ext_records);
+       if (ret->custom_srv_ext_records)
+               OPENSSL_free(ret->custom_srv_ext_records);
+#endif
+
        ssl_cert_clear_certs(ret);
 
        return NULL;
@@ -531,6 +559,12 @@ void ssl_cert_free(CERT *c)
                X509_STORE_free(c->chain_store);
        if (c->ciphers_raw)
                OPENSSL_free(c->ciphers_raw);
+#ifndef OPENSSL_NO_TLSEXT
+       if (c->custom_cli_ext_records)
+               OPENSSL_free(c->custom_cli_ext_records);
+       if (c->custom_srv_ext_records)
+               OPENSSL_free(c->custom_srv_ext_records);
+#endif
        OPENSSL_free(c);
        }
 
index 9f4040d..98f4018 100644 (file)
@@ -1751,7 +1751,7 @@ void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx, int (*cb) (SSL *s, unsigned
        }
 # endif
 
-int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
+static int cert_set_custom_cli_ext(CERT *cert, unsigned short ext_type,
                               custom_cli_ext_first_cb_fn fn1, 
                               custom_cli_ext_second_cb_fn fn2, void* arg)
        {
@@ -1759,19 +1759,19 @@ int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
        custom_cli_ext_record* record;
 
        /* Check for duplicates */
-       for (i=0; i < ctx->custom_cli_ext_records_count; i++)
-               if (ext_type == ctx->custom_cli_ext_records[i].ext_type)
+       for (i=0; i < cert->custom_cli_ext_records_count; i++)
+               if (ext_type == cert->custom_cli_ext_records[i].ext_type)
                        return 0;
 
-       ctx->custom_cli_ext_records = OPENSSL_realloc(ctx->custom_cli_ext_records,
-                                                     (ctx->custom_cli_ext_records_count + 1) * 
+       cert->custom_cli_ext_records = OPENSSL_realloc(cert->custom_cli_ext_records,
+                                                     (cert->custom_cli_ext_records_count + 1) * 
                                                      sizeof(custom_cli_ext_record));
-       if (!ctx->custom_cli_ext_records) {
-               ctx->custom_cli_ext_records_count = 0;
+       if (!cert->custom_cli_ext_records) {
+               cert->custom_cli_ext_records_count = 0;
                return 0;
        }
-       ctx->custom_cli_ext_records_count++;
-       record = &ctx->custom_cli_ext_records[ctx->custom_cli_ext_records_count - 1];
+       cert->custom_cli_ext_records_count++;
+       record = &cert->custom_cli_ext_records[cert->custom_cli_ext_records_count - 1];
        record->ext_type = ext_type;
        record->fn1 = fn1;
        record->fn2 = fn2;
@@ -1779,7 +1779,7 @@ int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
        return 1;
        }
 
-int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned short ext_type,
+static int cert_set_custom_srv_ext(CERT *cert, unsigned short ext_type,
                               custom_srv_ext_first_cb_fn fn1, 
                               custom_srv_ext_second_cb_fn fn2, void* arg)
        {
@@ -1787,25 +1787,39 @@ int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned short ext_type,
        custom_srv_ext_record* record;
 
        /* Check for duplicates */      
-       for (i=0; i < ctx->custom_srv_ext_records_count; i++)
-               if (ext_type == ctx->custom_srv_ext_records[i].ext_type)
+       for (i=0; i < cert->custom_srv_ext_records_count; i++)
+               if (ext_type == cert->custom_srv_ext_records[i].ext_type)
                        return 0;
 
-       ctx->custom_srv_ext_records = OPENSSL_realloc(ctx->custom_srv_ext_records,
-                                                     (ctx->custom_srv_ext_records_count + 1) * 
+       cert->custom_srv_ext_records = OPENSSL_realloc(cert->custom_srv_ext_records,
+                                                     (cert->custom_srv_ext_records_count + 1) * 
                                                      sizeof(custom_srv_ext_record));
-       if (!ctx->custom_srv_ext_records) {
-               ctx->custom_srv_ext_records_count = 0;
+       if (!cert->custom_srv_ext_records) {
+               cert->custom_srv_ext_records_count = 0;
                return 0;
        }
-       ctx->custom_srv_ext_records_count++;
-       record = &ctx->custom_srv_ext_records[ctx->custom_srv_ext_records_count - 1];
+       cert->custom_srv_ext_records_count++;
+       record = &cert->custom_srv_ext_records[cert->custom_srv_ext_records_count - 1];
        record->ext_type = ext_type;
        record->fn1 = fn1;
        record->fn2 = fn2;
        record->arg = arg;
        return 1;
        }
+int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
+                              custom_cli_ext_first_cb_fn fn1, 
+                              custom_cli_ext_second_cb_fn fn2, void *arg)
+       {
+       return cert_set_custom_cli_ext(ctx->cert, ext_type, fn1, fn2,arg);
+       }
+
+int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned short ext_type,
+                              custom_srv_ext_first_cb_fn fn1, 
+                              custom_srv_ext_second_cb_fn fn2, void *arg)
+       {
+       return cert_set_custom_srv_ext(ctx->cert, ext_type, fn1, fn2,arg);
+       }
 
 /* SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
  * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
@@ -2078,10 +2092,6 @@ SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
 #ifndef OPENSSL_NO_SRP
        SSL_CTX_SRP_CTX_init(ret);
 #endif
-       ret->custom_cli_ext_records = NULL;
-       ret->custom_cli_ext_records_count = 0;
-       ret->custom_srv_ext_records = NULL;
-       ret->custom_srv_ext_records_count = 0;
 #ifndef OPENSSL_NO_BUF_FREELISTS
        ret->freelist_max_len = SSL_MAX_BUF_FREELIST_LEN_DEFAULT;
        ret->rbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
@@ -2220,10 +2230,6 @@ void SSL_CTX_free(SSL_CTX *a)
 #ifndef OPENSSL_NO_SRP
        SSL_CTX_SRP_CTX_free(a);
 #endif
-#ifndef OPENSSL_NO_TLSEXT
-       OPENSSL_free(a->custom_cli_ext_records);
-       OPENSSL_free(a->custom_srv_ext_records);
-#endif
 #ifndef OPENSSL_NO_ENGINE
        if (a->client_cert_engine)
                ENGINE_finish(a->client_cert_engine);
index 7b28886..4a12aec 100644 (file)
@@ -532,6 +532,20 @@ typedef struct cert_pkey_st
 #define SSL_CERT_FLAGS_CHECK_TLS_STRICT \
        (SSL_CERT_FLAG_SUITEB_128_LOS|SSL_CERT_FLAG_TLS_STRICT)
 
+typedef struct {
+       unsigned short ext_type;
+       custom_cli_ext_first_cb_fn fn1; 
+       custom_cli_ext_second_cb_fn fn2; 
+       void *arg;
+} custom_cli_ext_record;
+
+typedef struct {
+       unsigned short ext_type;
+       custom_srv_ext_first_cb_fn fn1; 
+       custom_srv_ext_second_cb_fn fn2; 
+       void *arg;
+} custom_srv_ext_record;
+
 typedef struct cert_st
        {
        /* Current active set */
@@ -628,6 +642,12 @@ typedef struct cert_st
        unsigned char *ciphers_raw;
        size_t ciphers_rawlen;
 
+       /* Arrays containing the callbacks for custom TLS Extensions. */
+       custom_cli_ext_record *custom_cli_ext_records;
+       size_t custom_cli_ext_records_count;
+       custom_srv_ext_record *custom_srv_ext_records;
+       size_t custom_srv_ext_records_count;
+
        /* Security callback */
        int (*sec_cb)(SSL *s, SSL_CTX *ctx, int op, int bits, int nid, void *other, void *ex);
        /* Security level */
index 3616c0a..ac00a2a 100644 (file)
@@ -1482,17 +1482,17 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf, unsigned c
                 }
 
        /* Add custom TLS Extensions to ClientHello */
-       if (s->ctx->custom_cli_ext_records_count)
+       if (s->cert->custom_cli_ext_records_count)
                {
                size_t i;
                custom_cli_ext_record* record;
 
-               for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
+               for (i = 0; i < s->cert->custom_cli_ext_records_count; i++)
                        {
                        const unsigned char* out = NULL;
                        unsigned short outlen = 0;
 
-                       record = &s->ctx->custom_cli_ext_records[i];
+                       record = &s->cert->custom_cli_ext_records[i];
                        /* NULL callback sends empty extension */ 
                        /* -1 from callback omits extension */
                        if (record->fn1)
@@ -1747,13 +1747,13 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, unsigned c
                }
 #endif
 
-       for (i = 0; i < s->ctx->custom_srv_ext_records_count; i++)
+       for (i = 0; i < s->cert->custom_srv_ext_records_count; i++)
                {
                const unsigned char *out = NULL;
                unsigned short outlen = 0;
                int cb_retval = 0;
 
-               record = &s->ctx->custom_srv_ext_records[i];
+               record = &s->cert->custom_srv_ext_records[i];
 
                /* NULL callback or -1 omits extension */
                if (!record->fn2)
@@ -2503,13 +2503,13 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char
                 * so call the callback and record the extension number so that
                 * an appropriate ServerHello may be later returned.
                 */
-               else if (!s->hit && s->ctx->custom_srv_ext_records_count)
+               else if (!s->hit && s->cert->custom_srv_ext_records_count)
                        {
                        custom_srv_ext_record *record;
 
-                       for (i=0; i < s->ctx->custom_srv_ext_records_count; i++)
+                       for (i=0; i < s->cert->custom_srv_ext_records_count; i++)
                                {
-                               record = &s->ctx->custom_srv_ext_records[i];
+                               record = &s->cert->custom_srv_ext_records[i];
                                if (type == record->ext_type)
                                        {
                                        if (record->fn1 && !record->fn1(s, type, data, size, al, record->arg))
@@ -2848,14 +2848,14 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char
                /* If this extension type was not otherwise handled, but 
                 * matches a custom_cli_ext_record, then send it to the c
                 * callback */
-               else if (s->ctx->custom_cli_ext_records_count)
+               else if (s->cert->custom_cli_ext_records_count)
                        {
                        size_t i;
                        custom_cli_ext_record* record;
 
-                       for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
+                       for (i = 0; i < s->cert->custom_cli_ext_records_count; i++)
                                {
-                               record = &s->ctx->custom_cli_ext_records[i];
+                               record = &s->cert->custom_cli_ext_records[i];
                                if (record->ext_type == type)
                                        {
                                        if (record->fn2 && !record->fn2(s, type, data, size, al, record->arg))