Add support for magic cipher suite value (MCSV). Make secure renegotiation
[openssl.git] / ssl / ssl_lib.c
index d716d97c54771299d79f294ddcd8816dfdffd5d3..e0a592619243fbcd5b678d173c1fd1367affd16a 100644 (file)
 #include <openssl/objects.h>
 #include <openssl/lhash.h>
 #include <openssl/x509v3.h>
+#include <openssl/rand.h>
+#include <openssl/ocsp.h>
+#ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
+#endif
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
 
 const char *SSL_version_str=OPENSSL_VERSION_TEXT;
 
@@ -136,7 +143,14 @@ SSL3_ENC_METHOD ssl3_undef_enc_method={
        ssl_undefined_function,
        (int (*)(SSL *, unsigned char *, unsigned char *, int))ssl_undefined_function,
        (int (*)(SSL*, int))ssl_undefined_function,
-       (int (*)(SSL *, EVP_MD_CTX *, EVP_MD_CTX *, const char*, int, unsigned char *))ssl_undefined_function
+       (int (*)(SSL *, EVP_MD_CTX *, EVP_MD_CTX *, const char*, int, unsigned char *))ssl_undefined_function,
+       0,      /* finish_mac_length */
+       (int (*)(SSL *, EVP_MD_CTX *, unsigned char *))ssl_undefined_function,
+       NULL,   /* client_finished_label */
+       0,      /* client_finished_label_len */
+       NULL,   /* server_finished_label */
+       0,      /* server_finished_label_len */
+       (int (*)(int))ssl_undefined_function
        };
 
 int SSL_clear(SSL *s)
@@ -297,7 +311,19 @@ SSL *SSL_new(SSL_CTX *ctx)
 
        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
        s->ctx=ctx;
-
+#ifndef OPENSSL_NO_TLSEXT
+       s->tlsext_debug_cb = 0;
+       s->tlsext_debug_arg = NULL;
+       s->tlsext_ticket_expected = 0;
+       s->tlsext_status_type = -1;
+       s->tlsext_status_expected = 0;
+       s->tlsext_ocsp_ids = NULL;
+       s->tlsext_ocsp_exts = NULL;
+       s->tlsext_ocsp_resp = NULL;
+       s->tlsext_ocsp_resplen = -1;
+       CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
+       s->initial_ctx=ctx;
+#endif
        s->verify_result=X509_V_OK;
 
        s->method=ctx->method;
@@ -482,13 +508,25 @@ void SSL_free(SSL *s)
        if (s->cert != NULL) ssl_cert_free(s->cert);
        /* Free up if allocated */
 
-       if (s->ctx) SSL_CTX_free(s->ctx);
-
+#ifndef OPENSSL_NO_TLSEXT
+       if (s->tlsext_hostname)
+               OPENSSL_free(s->tlsext_hostname);
+       if (s->initial_ctx) SSL_CTX_free(s->initial_ctx);
+       if (s->tlsext_ocsp_exts)
+               sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
+                                               X509_EXTENSION_free);
+       if (s->tlsext_ocsp_ids)
+               sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
+       if (s->tlsext_ocsp_resp)
+               OPENSSL_free(s->tlsext_ocsp_resp);
+#endif
        if (s->client_CA != NULL)
                sk_X509_NAME_pop_free(s->client_CA,X509_NAME_free);
 
        if (s->method != NULL) s->method->ssl_free(s);
 
+       if (s->ctx) SSL_CTX_free(s->ctx);
+
 #ifndef        OPENSSL_NO_KRB5
        if (s->kssl_ctx != NULL)
                kssl_ctx_free(s->kssl_ctx);
@@ -958,7 +996,8 @@ long SSL_ctrl(SSL *s,int cmd,long larg,void *parg)
                s->max_cert_list=larg;
                return(l);
        case SSL_CTRL_SET_MTU:
-               if (SSL_version(s) == DTLS1_VERSION)
+               if (SSL_version(s) == DTLS1_VERSION ||
+                   SSL_version(s) == DTLS1_BAD_VER)
                        {
                        s->d1->mtu = larg;
                        return larg;
@@ -1153,8 +1192,21 @@ int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
        
        sk=ssl_create_cipher_list(ctx->method,&ctx->cipher_list,
                &ctx->cipher_list_by_id,str);
-/* XXXX */
-       return((sk == NULL)?0:1);
+       /* ssl_create_cipher_list may return an empty stack if it
+        * was unable to find a cipher matching the given rule string
+        * (for example if the rule string specifies a cipher which
+        * has been disabled). This is not an error as far as 
+        * ssl_create_cipher_list is concerned, and hence 
+        * ctx->cipher_list and ctx->cipher_list_by_id has been
+        * updated. */
+       if (sk == NULL)
+               return 0;
+       else if (sk_SSL_CIPHER_num(sk) == 0)
+               {
+               SSLerr(SSL_F_SSL_CTX_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
+               return 0;
+               }
+       return 1;
        }
 
 /** specify the ciphers to be used by the SSL */
@@ -1164,15 +1216,21 @@ int SSL_set_cipher_list(SSL *s,const char *str)
        
        sk=ssl_create_cipher_list(s->ctx->method,&s->cipher_list,
                &s->cipher_list_by_id,str);
-/* XXXX */
-       return((sk == NULL)?0:1);
+       /* see comment in SSL_CTX_set_cipher_list */
+       if (sk == NULL)
+               return 0;
+       else if (sk_SSL_CIPHER_num(sk) == 0)
+               {
+               SSLerr(SSL_F_SSL_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
+               return 0;
+               }
+       return 1;
        }
 
 /* works well for SSLv2, not so good for SSLv3 */
 char *SSL_get_shared_ciphers(const SSL *s,char *buf,int len)
        {
        char *p;
-       const char *cp;
        STACK_OF(SSL_CIPHER) *sk;
        SSL_CIPHER *c;
        int i;
@@ -1185,20 +1243,21 @@ char *SSL_get_shared_ciphers(const SSL *s,char *buf,int len)
        sk=s->session->ciphers;
        for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
                {
-               /* Decrement for either the ':' or a '\0' */
-               len--;
+               int n;
+
                c=sk_SSL_CIPHER_value(sk,i);
-               for (cp=c->name; *cp; )
+               n=strlen(c->name);
+               if (n+1 > len)
                        {
-                       if (len-- == 0)
-                               {
-                               *p='\0';
-                               return(buf);
-                               }
-                       else
-                               *(p++)= *(cp++);
+                       if (p != buf)
+                               --p;
+                       *p='\0';
+                       return buf;
                        }
+               strcpy(p,c->name);
+               p+=n;
                *(p++)=':';
+               len-=n+1;
                }
        p[-1]='\0';
        return(buf);
@@ -1228,6 +1287,22 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p,
                j = put_cb ? put_cb(c,p) : ssl_put_cipher_by_char(s,c,p);
                p+=j;
                }
+       /* If p == q, no ciphers and caller indicates an error, otherwise
+        * add MCSV
+        */
+       if (p != q)
+               {
+               static SSL_CIPHER msvc =
+                       {
+                       0, NULL, SSL3_CK_MCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
+                       };
+               j = put_cb ? put_cb(&msvc,p) : ssl_put_cipher_by_char(s,&msvc,p);
+               p+=j;
+#ifdef OPENSSL_RI_DEBUG
+               fprintf(stderr, "MCSV sent by client\n");
+#endif
+               }
+
        return(p-q);
        }
 
@@ -1238,6 +1313,8 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
        STACK_OF(SSL_CIPHER) *sk;
        int i,n;
 
+       s->s3->send_connection_binding = 0;
+
        n=ssl_put_cipher_by_char(s,NULL,NULL);
        if ((num%n) != 0)
                {
@@ -1254,6 +1331,19 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
 
        for (i=0; i<num; i+=n)
                {
+               /* Check for MCSV */
+               if ((n != 3 || !p[0]) &&
+                       (p[n-2] == ((SSL3_CK_MCSV >> 8) & 0xff)) &&
+                       (p[n-1] == (SSL3_CK_MCSV & 0xff)))
+                       {
+                       s->s3->send_connection_binding = 1;
+                       p += n;
+#ifdef OPENSSL_RI_DEBUG
+                       fprintf(stderr, "MCSV received by server\n");
+#endif
+                       continue;
+                       }
+
                c=ssl_get_cipher_by_char(s,p);
                p+=n;
                if (c != NULL)
@@ -1275,6 +1365,29 @@ err:
        return(NULL);
        }
 
+#ifndef OPENSSL_NO_TLSEXT
+/** return a servername extension value if provided in Client Hello, or NULL.
+ * So far, only host_name types are defined (RFC 3546).
+ */
+
+const char *SSL_get_servername(const SSL *s, const int type)
+       {
+       if (type != TLSEXT_NAMETYPE_host_name)
+               return NULL;
+
+       return s->session && !s->tlsext_hostname ?
+               s->session->tlsext_hostname :
+               s->tlsext_hostname;
+       }
+
+int SSL_get_servername_type(const SSL *s)
+       {
+       if (s->session && (!s->tlsext_hostname ? s->session->tlsext_hostname : s->tlsext_hostname))
+               return TLSEXT_NAMETYPE_host_name;
+       return -1;
+       }
+#endif
+
 unsigned long SSL_SESSION_hash(const SSL_SESSION *a)
        {
        unsigned long l;
@@ -1318,6 +1431,14 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
                return(NULL);
                }
 
+#ifdef OPENSSL_FIPS
+       if (FIPS_mode() && (meth->version < TLS1_VERSION))      
+               {
+               SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
+               return NULL;
+               }
+#endif
+
        if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
@@ -1377,8 +1498,8 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
        ret->default_passwd_callback=0;
        ret->default_passwd_callback_userdata=NULL;
        ret->client_cert_cb=0;
-    ret->app_gen_cookie_cb=0;
-    ret->app_verify_cookie_cb=0;
+       ret->app_gen_cookie_cb=0;
+       ret->app_verify_cookie_cb=0;
 
        ret->sessions=lh_new(LHASH_HASH_FN(SSL_SESSION_hash),
                        LHASH_COMP_FN(SSL_SESSION_cmp));
@@ -1424,6 +1545,41 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
        ret->extra_certs=NULL;
        ret->comp_methods=SSL_COMP_get_compression_methods();
 
+#ifndef OPENSSL_NO_TLSEXT
+       ret->tlsext_servername_callback = 0;
+       ret->tlsext_servername_arg = NULL;
+       /* Setup RFC4507 ticket keys */
+       if ((RAND_pseudo_bytes(ret->tlsext_tick_key_name, 16) <= 0)
+               || (RAND_bytes(ret->tlsext_tick_hmac_key, 16) <= 0)
+               || (RAND_bytes(ret->tlsext_tick_aes_key, 16) <= 0))
+               ret->options |= SSL_OP_NO_TICKET;
+
+       ret->tlsext_status_cb = 0;
+       ret->tlsext_status_arg = NULL;
+
+#endif
+
+#ifndef OPENSSL_NO_ENGINE
+       ret->client_cert_engine = NULL;
+#ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
+#define eng_strx(x)    #x
+#define eng_str(x)     eng_strx(x)
+       /* Use specific client engine automatically... ignore errors */
+       {
+       ENGINE *eng;
+       eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
+       if (!eng)
+               {
+               ERR_clear_error();
+               ENGINE_load_builtin_engines();
+               eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
+               }
+       if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
+               ERR_clear_error();
+       }
+#endif
+#endif
+
        return(ret);
 err:
        SSLerr(SSL_F_SSL_CTX_NEW,ERR_R_MALLOC_FAILURE);
@@ -1493,6 +1649,10 @@ void SSL_CTX_free(SSL_CTX *a)
                sk_SSL_COMP_pop_free(a->comp_methods,SSL_COMP_free);
 #else
        a->comp_methods = NULL;
+#endif
+#ifndef OPENSSL_NO_ENGINE
+       if (a->client_cert_engine)
+               ENGINE_finish(a->client_cert_engine);
 #endif
        OPENSSL_free(a);
        }
@@ -1531,7 +1691,10 @@ void ssl_set_cert_masks(CERT *c, SSL_CIPHER *cipher)
        int rsa_enc_export,dh_rsa_export,dh_dsa_export;
        int rsa_tmp_export,dh_tmp_export,kl;
        unsigned long mask,emask;
-       int have_ecc_cert, have_ecdh_tmp, ecdh_ok, ecdsa_ok, ecc_pkey_size;
+       int have_ecc_cert, ecdh_ok, ecdsa_ok, ecc_pkey_size;
+#ifndef OPENSSL_NO_ECDH
+       int have_ecdh_tmp;
+#endif
        X509 *x = NULL;
        EVP_PKEY *ecc_pkey = NULL;
        int signature_nid = 0;
@@ -1869,7 +2032,7 @@ void ssl_update_cache(SSL *s,int mode)
                        ?s->ctx->stats.sess_connect_good
                        :s->ctx->stats.sess_accept_good) & 0xff) == 0xff)
                        {
-                       SSL_CTX_flush_sessions(s->ctx,time(NULL));
+                       SSL_CTX_flush_sessions(s->ctx,(unsigned long)time(NULL));
                        }
                }
        }
@@ -2214,6 +2377,7 @@ void ssl_clear_cipher_ctx(SSL *s)
                OPENSSL_free(s->enc_write_ctx);
                s->enc_write_ctx=NULL;
                }
+#ifndef OPENSSL_NO_COMP
        if (s->expand != NULL)
                {
                COMP_CTX_free(s->expand);
@@ -2224,6 +2388,7 @@ void ssl_clear_cipher_ctx(SSL *s)
                COMP_CTX_free(s->compress);
                s->compress=NULL;
                }
+#endif
        }
 
 /* Fix this function so that it takes an optional type parameter */
@@ -2250,6 +2415,16 @@ SSL_CIPHER *SSL_get_current_cipher(const SSL *s)
                return(s->session->cipher);
        return(NULL);
        }
+#ifdef OPENSSL_NO_COMP
+const void *SSL_get_current_compression(SSL *s)
+       {
+       return NULL;
+       }
+const void *SSL_get_current_expansion(SSL *s)
+       {
+       return NULL;
+       }
+#else
 
 const COMP_METHOD *SSL_get_current_compression(SSL *s)
        {
@@ -2264,6 +2439,7 @@ const COMP_METHOD *SSL_get_current_expansion(SSL *s)
                return(s->expand->meth);
        return(NULL);
        }
+#endif
 
 int ssl_init_wbio_buffer(SSL *s,int push)
        {
@@ -2357,6 +2533,24 @@ SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl)
        return(ssl->ctx);
        }
 
+SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX* ctx)
+       {
+       if (ssl->ctx == ctx)
+               return ssl->ctx;
+#ifndef OPENSSL_NO_TLSEXT
+       if (ctx == NULL)
+               ctx = ssl->initial_ctx;
+#endif
+       if (ssl->cert != NULL)
+               ssl_cert_free(ssl->cert);
+       ssl->cert = ssl_cert_dup(ctx->cert);
+       CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
+       if (ssl->ctx != NULL)
+               SSL_CTX_free(ssl->ctx); /* decrement reference count */
+       ssl->ctx = ctx;
+       return(ssl->ctx);
+       }
+
 #ifndef OPENSSL_NO_STDIO
 int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
        {
@@ -2371,12 +2565,14 @@ int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
 #endif
 
 void SSL_set_info_callback(SSL *ssl,
-                          void (*cb)(const SSL *ssl,int type,int val))
+       void (*cb)(const SSL *ssl,int type,int val))
        {
        ssl->info_callback=cb;
        }
 
-void (*SSL_get_info_callback(const SSL *ssl))(const SSL *ssl,int type,int val)
+/* One compiler (Diab DCC) doesn't like argument names in returned
+   function pointer.  */
+void (*SSL_get_info_callback(const SSL *ssl))(const SSL * /*ssl*/,int /*type*/,int /*val*/) 
        {
        return ssl->info_callback;
        }