Changes to the Kerberos SSL code by Jeffrey Altman <jaltman@columbia.edu>
[openssl.git] / ssl / ssl_lib.c
index 9b02b6a3438f8d5f3ee80361988195551525ac5a..42278220ad981e31ceb90487782a7c2799ef3032 100644 (file)
  * [including the GNU Public Licence.]
  */
 
+
+#ifdef REF_CHECK
+#  include <assert.h>
+#endif
 #include <stdio.h>
 #include <openssl/objects.h>
 #include <openssl/lhash.h>
@@ -103,7 +107,7 @@ int SSL_clear(SSL *s)
 #else
        if (s->new_session)
                {
-               SSLerr(SSL_F_SSL_CLEAR,SSL_R_INTERNAL_ERROR);
+               SSLerr(SSL_F_SSL_CLEAR,ERR_R_INTERNAL_ERROR);
                return 0;
                }
 #endif
@@ -117,7 +121,9 @@ int SSL_clear(SSL *s)
        s->client_version=s->version;
        s->rwstate=SSL_NOTHING;
        s->rstate=SSL_ST_READ_HEADER;
+#if 0
        s->read_ahead=s->ctx->read_ahead;
+#endif
 
        if (s->init_buf != NULL)
                {
@@ -183,10 +189,14 @@ SSL *SSL_new(SSL_CTX *ctx)
                return(NULL);
                }
 
-       s=(SSL *)Malloc(sizeof(SSL));
+       s=(SSL *)OPENSSL_malloc(sizeof(SSL));
        if (s == NULL) goto err;
        memset(s,0,sizeof(SSL));
 
+#ifndef        OPENSSL_NO_KRB5
+       s->kssl_ctx = kssl_ctx_new();
+#endif /* OPENSSL_NO_KRB5 */
+
        if (ctx->cert != NULL)
                {
                /* Earlier library versions used to copy the pointer to
@@ -210,6 +220,7 @@ SSL *SSL_new(SSL_CTX *ctx)
        s->verify_mode=ctx->verify_mode;
        s->verify_depth=ctx->verify_depth;
        s->verify_callback=ctx->default_verify_callback;
+       s->generate_session_id=ctx->generate_session_id;
        s->purpose = ctx->purpose;
        s->trust = ctx->trust;
        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
@@ -227,6 +238,7 @@ SSL *SSL_new(SSL_CTX *ctx)
        s->server=(ctx->method->ssl_accept == ssl_undefined_function)?0:1;
        s->options=ctx->options;
        s->mode=ctx->mode;
+       s->read_ahead=ctx->read_ahead; /* used to happen in SSL_clear */
        SSL_clear(s);
 
        CRYPTO_new_ex_data(ssl_meth,s,&s->ex_data);
@@ -239,7 +251,7 @@ err:
                        ssl_cert_free(s->cert);
                if (s->ctx != NULL)
                        SSL_CTX_free(s->ctx); /* decrement reference count */
-               Free(s);
+               OPENSSL_free(s);
                }
        SSLerr(SSL_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
        return(NULL);
@@ -273,44 +285,70 @@ int SSL_set_session_id_context(SSL *ssl,const unsigned char *sid_ctx,
     return 1;
     }
 
-int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
-{
-       if(X509_PURPOSE_get_by_id(purpose) == -1) {
-               SSLerr(SSL_F_SSL_CTX_SET_PURPOSE, SSL_R_INVALID_PURPOSE);
-               return 0;
+int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)
+       {
+       CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
+       ctx->generate_session_id = cb;
+       CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
+       return 1;
        }
-       s->purpose = purpose;
+
+int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)
+       {
+       CRYPTO_w_lock(CRYPTO_LOCK_SSL);
+       ssl->generate_session_id = cb;
+       CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
        return 1;
+       }
+
+int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,
+                               unsigned int id_len)
+       {
+       /* A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how
+        * we can "construct" a session to give us the desired check - ie. to
+        * find if there's a session in the hash table that would conflict with
+        * any new session built out of this id/id_len and the ssl_version in
+        * use by this SSL. */
+       SSL_SESSION r, *p;
+       r.ssl_version = ssl->version;
+       r.session_id_length = id_len;
+       memcpy(r.session_id, id, id_len);
+       /* NB: SSLv2 always uses a fixed 16-byte session ID, so even if a
+        * callback is calling us to check the uniqueness of a shorter ID, it
+        * must be compared as a padded-out ID because that is what it will be
+        * converted to when the callback has finished choosing it. */
+       if((r.ssl_version == SSL2_VERSION) &&
+                       (id_len < SSL2_SSL_SESSION_ID_LENGTH))
+               {
+               memset(r.session_id + id_len, 0,
+                       SSL2_SSL_SESSION_ID_LENGTH - id_len);
+               r.session_id_length = SSL2_SSL_SESSION_ID_LENGTH;
+               }
+
+       CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
+       p = (SSL_SESSION *)lh_retrieve(ssl->ctx->sessions, &r);
+       CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
+       return (p != NULL);
+       }
+
+int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
+{
+       return X509_PURPOSE_set(&s->purpose, purpose);
 }
 
 int SSL_set_purpose(SSL *s, int purpose)
 {
-       if(X509_PURPOSE_get_by_id(purpose) == -1) {
-               SSLerr(SSL_F_SSL_SET_PURPOSE, SSL_R_INVALID_PURPOSE);
-               return 0;
-       }
-       s->purpose = purpose;
-       return 1;
+       return X509_PURPOSE_set(&s->purpose, purpose);
 }
-       
+
 int SSL_CTX_set_trust(SSL_CTX *s, int trust)
 {
-       if(X509_TRUST_get_by_id(trust) == -1) {
-               SSLerr(SSL_F_SSL_CTX_SET_TRUST, SSL_R_INVALID_TRUST);
-               return 0;
-       }
-       s->trust = trust;
-       return 1;
+       return X509_TRUST_set(&s->trust, trust);
 }
 
 int SSL_set_trust(SSL *s, int trust)
 {
-       if(X509_TRUST_get_by_id(trust) == -1) {
-               SSLerr(SSL_F_SSL_SET_TRUST, SSL_R_INVALID_TRUST);
-               return 0;
-       }
-       s->trust = trust;
-       return 1;
+       return X509_TRUST_set(&s->trust, trust);
 }
 
 void SSL_free(SSL *s)
@@ -375,7 +413,7 @@ void SSL_free(SSL *s)
 
        if (s->method != NULL) s->method->ssl_free(s);
 
-       Free(s);
+       OPENSSL_free(s);
        }
 
 void SSL_set_bio(SSL *s,BIO *rbio,BIO *wbio)
@@ -416,7 +454,7 @@ int SSL_get_fd(SSL *s)
        return(ret);
        }
 
-#ifndef NO_SOCK
+#ifndef OPENSSL_NO_SOCK
 int SSL_set_fd(SSL *s,int fd)
        {
        int ret=0;
@@ -571,6 +609,13 @@ int SSL_get_read_ahead(SSL *s)
 
 int SSL_pending(SSL *s)
        {
+       /* SSL_pending cannot work properly if read-ahead is enabled
+        * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)),
+        * and it is impossible to fix since SSL_pending cannot report
+        * errors that may be observed while scanning the new data.
+        * (Note that SSL_pending() is often used as a boolean value,
+        * so we'd better not return -1.)
+        */
        return(s->method->ssl_pending(s));
        }
 
@@ -599,6 +644,9 @@ STACK_OF(X509) *SSL_get_peer_cert_chain(SSL *s)
        else
                r=s->session->sess_cert->cert_chain;
 
+       /* If we are a client, cert_chain includes the peer's own
+        * certificate; if we are a server, it does not. */
+       
        return(r);
        }
 
@@ -700,7 +748,7 @@ long SSL_get_default_timeout(SSL *s)
        return(s->method->get_timeout());
        }
 
-int SSL_read(SSL *s,char *buf,int num)
+int SSL_read(SSL *s,void *buf,int num)
        {
        if (s->handshake_func == 0)
                {
@@ -716,8 +764,14 @@ int SSL_read(SSL *s,char *buf,int num)
        return(s->method->ssl_read(s,buf,num));
        }
 
-int SSL_peek(SSL *s,char *buf,int num)
+int SSL_peek(SSL *s,void *buf,int num)
        {
+       if (s->handshake_func == 0)
+               {
+               SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
+               return -1;
+               }
+
        if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
                {
                return(0);
@@ -725,7 +779,7 @@ int SSL_peek(SSL *s,char *buf,int num)
        return(s->method->ssl_peek(s,buf,num));
        }
 
-int SSL_write(SSL *s,const char *buf,int num)
+int SSL_write(SSL *s,const void *buf,int num)
        {
        if (s->handshake_func == 0)
                {
@@ -798,6 +852,11 @@ long SSL_callback_ctrl(SSL *s, int cmd, void (*fp)())
                }
        }
 
+struct lhash_st *SSL_CTX_sessions(SSL_CTX *ctx)
+       {
+       return ctx->sessions;
+       }
+
 long SSL_CTX_ctrl(SSL_CTX *ctx,int cmd,long larg,char *parg)
        {
        long l;
@@ -866,7 +925,7 @@ long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)())
                }
        }
 
-int ssl_cipher_id_cmp(SSL_CIPHER *a,SSL_CIPHER *b)
+int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
        {
        long l;
 
@@ -877,7 +936,8 @@ int ssl_cipher_id_cmp(SSL_CIPHER *a,SSL_CIPHER *b)
                return((l > 0)?1:-1);
        }
 
-int ssl_cipher_ptr_id_cmp(SSL_CIPHER **ap,SSL_CIPHER **bp)
+int ssl_cipher_ptr_id_cmp(const SSL_CIPHER * const *ap,
+                       const SSL_CIPHER * const *bp)
        {
        long l;
 
@@ -998,6 +1058,9 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p)
        int i,j=0;
        SSL_CIPHER *c;
        unsigned char *q;
+#ifndef OPENSSL_NO_KRB5
+        int nokrb5 = !kssl_tgt_is_available(s->kssl_ctx);
+#endif /* OPENSSL_NO_KRB5 */
 
        if (sk == NULL) return(0);
        q=p;
@@ -1005,6 +1068,10 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p)
        for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
                {
                c=sk_SSL_CIPHER_value(sk,i);
+#ifndef OPENSSL_NO_KRB5
+                if ((c->algorithms & SSL_KRB5) && nokrb5)
+                    continue;
+#endif /* OPENSSL_NO_KRB5 */                    
                j=ssl_put_cipher_by_char(s,c,p);
                p+=j;
                }
@@ -1025,7 +1092,7 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
                return(NULL);
                }
        if ((skp == NULL) || (*skp == NULL))
-               sk=sk_SSL_CIPHER_new(NULL); /* change perhaps later */
+               sk=sk_SSL_CIPHER_new_null(); /* change perhaps later */
        else
                {
                sk= *skp;
@@ -1067,6 +1134,11 @@ unsigned long SSL_SESSION_hash(SSL_SESSION *a)
        return(l);
        }
 
+/* NB: If this function (or indeed the hash function which uses a sort of
+ * coarser function than this one) is changed, ensure
+ * SSL_CTX_has_matching_session_id() is checked accordingly. It relies on being
+ * able to construct an SSL_SESSION that will collide with any existing session
+ * with a matching session ID. */
 int SSL_SESSION_cmp(SSL_SESSION *a,SSL_SESSION *b)
        {
        if (a->ssl_version != b->ssl_version)
@@ -1076,6 +1148,13 @@ int SSL_SESSION_cmp(SSL_SESSION *a,SSL_SESSION *b)
        return(memcmp(a->session_id,b->session_id,a->session_id_length));
        }
 
+/* These wrapper functions should remain rather than redeclaring
+ * SSL_SESSION_hash and SSL_SESSION_cmp for void* types and casting each
+ * variable. The reason is that the functions aren't static, they're exposed via
+ * ssl.h. */
+static IMPLEMENT_LHASH_HASH_FN(SSL_SESSION_hash, SSL_SESSION *)
+static IMPLEMENT_LHASH_COMP_FN(SSL_SESSION_cmp, SSL_SESSION *)
+
 SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
        {
        SSL_CTX *ret=NULL;
@@ -1091,7 +1170,7 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
                goto err;
                }
-       ret=(SSL_CTX *)Malloc(sizeof(SSL_CTX));
+       ret=(SSL_CTX *)OPENSSL_malloc(sizeof(SSL_CTX));
        if (ret == NULL)
                goto err;
 
@@ -1111,6 +1190,7 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
        ret->new_session_cb=NULL;
        ret->remove_session_cb=NULL;
        ret->get_session_cb=NULL;
+       ret->generate_session_id=NULL;
 
        memset((char *)&ret->stats,0,sizeof(ret->stats));
 
@@ -1139,7 +1219,8 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
        ret->default_passwd_callback_userdata=NULL;
        ret->client_cert_cb=NULL;
 
-       ret->sessions=lh_new(SSL_SESSION_hash,SSL_SESSION_cmp);
+       ret->sessions=lh_new(LHASH_HASH_FN(SSL_SESSION_hash),
+                       LHASH_COMP_FN(SSL_SESSION_cmp));
        if (ret->sessions == NULL) goto err;
        ret->cert_store=X509_STORE_new();
        if (ret->cert_store == NULL) goto err;
@@ -1186,8 +1267,10 @@ err2:
        return(NULL);
        }
 
+#if 0
 static void SSL_COMP_free(SSL_COMP *comp)
-    { Free(comp); }
+    { OPENSSL_free(comp); }
+#endif
 
 void SSL_CTX_free(SSL_CTX *a)
        {
@@ -1226,9 +1309,13 @@ void SSL_CTX_free(SSL_CTX *a)
                sk_X509_NAME_pop_free(a->client_CA,X509_NAME_free);
        if (a->extra_certs != NULL)
                sk_X509_pop_free(a->extra_certs,X509_free);
+#if 0 /* This should never be done, since it removes a global database */
        if (a->comp_methods != NULL)
                sk_SSL_COMP_pop_free(a->comp_methods,SSL_COMP_free);
-       Free(a);
+#else
+       a->comp_methods = NULL;
+#endif
+       OPENSSL_free(a);
        }
 
 void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
@@ -1277,14 +1364,14 @@ void ssl_set_cert_masks(CERT *c, SSL_CIPHER *cipher)
 
        kl=SSL_C_EXPORT_PKEYLENGTH(cipher);
 
-#ifndef NO_RSA
+#ifndef OPENSSL_NO_RSA
        rsa_tmp=(c->rsa_tmp != NULL || c->rsa_tmp_cb != NULL);
        rsa_tmp_export=(c->rsa_tmp_cb != NULL ||
                (rsa_tmp && RSA_size(c->rsa_tmp)*8 <= kl));
 #else
        rsa_tmp=rsa_tmp_export=0;
 #endif
-#ifndef NO_DH
+#ifndef OPENSSL_NO_DH
        dh_tmp=(c->dh_tmp != NULL || c->dh_tmp_cb != NULL);
        dh_tmp_export=(c->dh_tmp_cb != NULL ||
                (dh_tmp && DH_size(c->dh_tmp)*8 <= kl));
@@ -1358,6 +1445,11 @@ void ssl_set_cert_masks(CERT *c, SSL_CIPHER *cipher)
        mask|=SSL_aNULL;
        emask|=SSL_aNULL;
 
+#ifndef OPENSSL_NO_KRB5
+       mask|=SSL_kKRB5|SSL_aKRB5;
+       emask|=SSL_kKRB5|SSL_aKRB5;
+#endif
+
        c->mask=mask;
        c->export_mask=emask;
        c->valid=1;
@@ -1390,9 +1482,14 @@ X509 *ssl_get_server_send_cert(SSL *s)
                else
                        i=SSL_PKEY_RSA_ENC;
                }
+       else if (kalg & SSL_aKRB5)
+               {
+               /* VRS something else here? */
+               return(NULL);
+               }
        else /* if (kalg & SSL_aNULL) */
                {
-               SSLerr(SSL_F_SSL_GET_SERVER_SEND_CERT,SSL_R_INTERNAL_ERROR);
+               SSLerr(SSL_F_SSL_GET_SERVER_SEND_CERT,ERR_R_INTERNAL_ERROR);
                return(NULL);
                }
        if (c->pkeys[i].x509 == NULL) return(NULL);
@@ -1421,7 +1518,7 @@ EVP_PKEY *ssl_get_sign_pkey(SSL *s,SSL_CIPHER *cipher)
                }
        else /* if (alg & SSL_aNULL) */
                {
-               SSLerr(SSL_F_SSL_GET_SIGN_PKEY,SSL_R_INTERNAL_ERROR);
+               SSLerr(SSL_F_SSL_GET_SIGN_PKEY,ERR_R_INTERNAL_ERROR);
                return(NULL);
                }
        }
@@ -1529,6 +1626,8 @@ int SSL_get_error(SSL *s,int i)
                        reason=BIO_get_retry_reason(bio);
                        if (reason == BIO_RR_CONNECT)
                                return(SSL_ERROR_WANT_CONNECT);
+                       else if (reason == BIO_RR_ACCEPT)
+                               return(SSL_ERROR_WANT_ACCEPT);
                        else
                                return(SSL_ERROR_SYSCALL); /* unknown */
                        }
@@ -1547,6 +1646,8 @@ int SSL_get_error(SSL *s,int i)
                        reason=BIO_get_retry_reason(bio);
                        if (reason == BIO_RR_CONNECT)
                                return(SSL_ERROR_WANT_CONNECT);
+                       else if (reason == BIO_RR_ACCEPT)
+                               return(SSL_ERROR_WANT_ACCEPT);
                        else
                                return(SSL_ERROR_SYSCALL);
                        }
@@ -1665,6 +1766,10 @@ SSL *SSL_dup(SSL *s)
 
                if (s->cert != NULL)
                        {
+                       if (ret->cert != NULL)
+                               {
+                               ssl_cert_free(ret->cert);
+                               }
                        ret->cert = ssl_cert_dup(s->cert);
                        if (ret->cert == NULL)
                                goto err;
@@ -1751,13 +1856,13 @@ void ssl_clear_cipher_ctx(SSL *s)
        if (s->enc_read_ctx != NULL)
                {
                EVP_CIPHER_CTX_cleanup(s->enc_read_ctx);
-               Free(s->enc_read_ctx);
+               OPENSSL_free(s->enc_read_ctx);
                s->enc_read_ctx=NULL;
                }
        if (s->enc_write_ctx != NULL)
                {
                EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
-               Free(s->enc_write_ctx);
+               OPENSSL_free(s->enc_write_ctx);
                s->enc_write_ctx=NULL;
                }
        if (s->expand != NULL)
@@ -1835,19 +1940,16 @@ int ssl_init_wbio_buffer(SSL *s,int push)
 
 void ssl_free_wbio_buffer(SSL *s)
        {
-       BIO *under;
-
        if (s->bbio == NULL) return;
 
        if (s->bbio == s->wbio)
                {
                /* remove buffering */
-               under=BIO_pop(s->wbio);
-               if (under != NULL)
-                       s->wbio=under;
-               else
-                       abort(); /* ok */
-               }
+               s->wbio=BIO_pop(s->wbio);
+#ifdef REF_CHECK /* not the usual REF_CHECK, but this avoids adding one more preprocessor symbol */
+               assert(s->wbio != NULL);
+#endif 
+       }
        BIO_free(s->bbio);
        s->bbio=NULL;
        }
@@ -1892,7 +1994,7 @@ SSL_CTX *SSL_get_SSL_CTX(SSL *ssl)
        return(ssl->ctx);
        }
 
-#ifndef NO_STDIO
+#ifndef OPENSSL_NO_STDIO
 int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
        {
        return(X509_STORE_set_default_paths(ctx->cert_store));
@@ -1994,7 +2096,7 @@ int SSL_want(SSL *s)
  * \param cb the callback
  */
 
-#ifndef NO_RSA
+#ifndef OPENSSL_NO_RSA
 void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,RSA *(*cb)(SSL *ssl,
                                                          int is_export,
                                                          int keylength))
@@ -2031,7 +2133,7 @@ RSA *cb(SSL *ssl,int is_export,int keylength)
  * \param dh the callback
  */
 
-#ifndef NO_DH
+#ifndef OPENSSL_NO_DH
 void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,DH *(*dh)(SSL *ssl,int is_export,
                                                        int keylength))
     {
@@ -2045,7 +2147,7 @@ void SSL_set_tmp_dh_callback(SSL *ssl,DH *(*dh)(SSL *ssl,int is_export,
     }
 #endif
 
-#if defined(_WINDLL) && defined(WIN16)
+#if defined(_WINDLL) && defined(OPENSSL_SYS_WIN16)
 #include "../crypto/bio/bss_file.c"
 #endif