First tentative impementation of Kerberos 5 cryptos and keys for SSL/TLS. Implemente...
[openssl.git] / ssl / ssl_lib.c
index 566d112d0719062e0e4d330984622c05799823a3..866cd182d4c6ceafa0ff532f45bde4327f954318 100644 (file)
  * [including the GNU Public Licence.]
  */
 
+
+#include <assert.h>
 #include <stdio.h>
-#include "objects.h"
-#include "lhash.h"
+#include <openssl/objects.h>
+#include <openssl/lhash.h>
+#include <openssl/x509v3.h>
 #include "ssl_locl.h"
 
-char *SSL_version_str=OPENSSL_VERSION_TEXT;
+const char *SSL_version_str=OPENSSL_VERSION_TEXT;
 
-static STACK *ssl_meth=NULL;
-static STACK *ssl_ctx_meth=NULL;
+static STACK_OF(CRYPTO_EX_DATA_FUNCS) *ssl_meth=NULL;
+static STACK_OF(CRYPTO_EX_DATA_FUNCS) *ssl_ctx_meth=NULL;
 static int ssl_meth_num=0;
 static int ssl_ctx_meth_num=0;
 
-SSL3_ENC_METHOD ssl3_undef_enc_method={
-       ssl_undefined_function,
-       ssl_undefined_function,
-       ssl_undefined_function,
-       ssl_undefined_function,
-       ssl_undefined_function,
+OPENSSL_GLOBAL SSL3_ENC_METHOD ssl3_undef_enc_method={
+       /* evil casts, but these functions are only called if there's a library bug */
+       (int (*)(SSL *,int))ssl_undefined_function,
+       (int (*)(SSL *, unsigned char *, int))ssl_undefined_function,
        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_clear(SSL *s)
@@ -93,10 +97,17 @@ int SSL_clear(SSL *s)
        s->hit=0;
        s->shutdown=0;
 
-#if 0
+#if 0 /* Disabled since version 1.10 of this file (early return not
+       * needed because SSL_clear is not called when doing renegotiation) */
        /* This is set if we are doing dynamic renegotiation so keep
         * the old cipher.  It is sort of a SSL_clear_lite :-) */
        if (s->new_session) return(1);
+#else
+       if (s->new_session)
+               {
+               SSLerr(SSL_F_SSL_CLEAR,SSL_R_INTERNAL_ERROR);
+               return 0;
+               }
 #endif
 
        state=s->state; /* Keep to check if we throw away the session-id */
@@ -108,7 +119,9 @@ 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)
                {
@@ -174,20 +187,39 @@ 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));
 
-       if (ctx->default_cert != NULL)
+#ifndef        NO_KRB5
+       s->kssl_ctx = kssl_ctx_new();
+#endif /* NO_KRB5 */
+
+       if (ctx->cert != NULL)
                {
-               CRYPTO_add(&ctx->default_cert->references,1,
-                          CRYPTO_LOCK_SSL_CERT);
-               s->cert=ctx->default_cert;
+               /* Earlier library versions used to copy the pointer to
+                * the CERT, not its contents; only when setting new
+                * parameters for the per-SSL copy, ssl_cert_new would be
+                * called (and the direct reference to the per-SSL_CTX
+                * settings would be lost, but those still were indirectly
+                * accessed for various purposes, and for that reason they
+                * used to be known as s->ctx->default_cert).
+                * Now we don't look at the SSL_CTX's CERT after having
+                * duplicated it once. */
+
+               s->cert = ssl_cert_dup(ctx->cert);
+               if (s->cert == NULL)
+                       goto err;
                }
        else
-               s->cert=NULL;
+               s->cert=NULL; /* Cannot really happen (see SSL_CTX_new) */
+       s->sid_ctx_length=ctx->sid_ctx_length;
+       memcpy(&s->sid_ctx,&ctx->sid_ctx,sizeof(s->sid_ctx));
        s->verify_mode=ctx->verify_mode;
+       s->verify_depth=ctx->verify_depth;
        s->verify_callback=ctx->default_verify_callback;
+       s->purpose = ctx->purpose;
+       s->trust = ctx->trust;
        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
        s->ctx=ctx;
 
@@ -196,26 +228,46 @@ SSL *SSL_new(SSL_CTX *ctx)
        s->method=ctx->method;
 
        if (!s->method->ssl_new(s))
-               {
-               SSL_CTX_free(ctx);
-               Free(s);
                goto err;
-               }
 
        s->quiet_shutdown=ctx->quiet_shutdown;
        s->references=1;
        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,(char *)s,&s->ex_data);
+       CRYPTO_new_ex_data(ssl_meth,s,&s->ex_data);
 
        return(s);
 err:
+       if (s != NULL)
+               {
+               if (s->cert != NULL)
+                       ssl_cert_free(s->cert);
+               if (s->ctx != NULL)
+                       SSL_CTX_free(s->ctx); /* decrement reference count */
+               OPENSSL_free(s);
+               }
        SSLerr(SSL_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
        return(NULL);
        }
 
+int SSL_CTX_set_session_id_context(SSL_CTX *ctx,const unsigned char *sid_ctx,
+                                  unsigned int sid_ctx_len)
+    {
+    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)
+       {
+       SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
+       return 0;
+       }
+    ctx->sid_ctx_length=sid_ctx_len;
+    memcpy(ctx->sid_ctx,sid_ctx,sid_ctx_len);
+
+    return 1;
+    }
+
 int SSL_set_session_id_context(SSL *ssl,const unsigned char *sid_ctx,
                               unsigned int sid_ctx_len)
     {
@@ -230,6 +282,46 @@ 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;
+       }
+       s->purpose = purpose;
+       return 1;
+}
+
+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;
+}
+       
+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;
+}
+
+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;
+}
+
 void SSL_free(SSL *s)
        {
        int i;
@@ -292,7 +384,7 @@ void SSL_free(SSL *s)
 
        if (s->method != NULL) s->method->ssl_free(s);
 
-       Free((char *)s);
+       OPENSSL_free(s);
        }
 
 void SSL_set_bio(SSL *s,BIO *rbio,BIO *wbio)
@@ -401,11 +493,48 @@ err:
        }
 #endif
 
+
+/* return length of latest Finished message we sent, copy to 'buf' */
+size_t SSL_get_finished(SSL *s, void *buf, size_t count)
+       {
+       size_t ret = 0;
+       
+       if (s->s3 != NULL)
+               {
+               ret = s->s3->tmp.finish_md_len;
+               if (count > ret)
+                       count = ret;
+               memcpy(buf, s->s3->tmp.finish_md, count);
+               }
+       return ret;
+       }
+
+/* return length of latest Finished message we expected, copy to 'buf' */
+size_t SSL_get_peer_finished(SSL *s, void *buf, size_t count)
+       {
+       size_t ret = 0;
+       
+       if (s->s3 != NULL)
+               {
+               ret = s->s3->tmp.peer_finish_md_len;
+               if (count > ret)
+                       count = ret;
+               memcpy(buf, s->s3->tmp.peer_finish_md, count);
+               }
+       return ret;
+       }
+
+
 int SSL_get_verify_mode(SSL *s)
        {
        return(s->verify_mode);
        }
 
+int SSL_get_verify_depth(SSL *s)
+       {
+       return(s->verify_depth);
+       }
+
 int (*SSL_get_verify_callback(SSL *s))(int,X509_STORE_CTX *)
        {
        return(s->verify_callback);
@@ -416,6 +545,11 @@ int SSL_CTX_get_verify_mode(SSL_CTX *ctx)
        return(ctx->verify_mode);
        }
 
+int SSL_CTX_get_verify_depth(SSL_CTX *ctx)
+       {
+       return(ctx->verify_depth);
+       }
+
 int (*SSL_CTX_get_verify_callback(SSL_CTX *ctx))(int,X509_STORE_CTX *)
        {
        return(ctx->default_verify_callback);
@@ -429,6 +563,11 @@ void SSL_set_verify(SSL *s,int mode,
                s->verify_callback=callback;
        }
 
+void SSL_set_verify_depth(SSL *s,int depth)
+       {
+       s->verify_depth=depth;
+       }
+
 void SSL_set_read_ahead(SSL *s,int yes)
        {
        s->read_ahead=yes;
@@ -441,6 +580,13 @@ 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));
        }
 
@@ -464,11 +610,14 @@ STACK_OF(X509) *SSL_get_peer_cert_chain(SSL *s)
        {
        STACK_OF(X509) *r;
        
-       if ((s == NULL) || (s->session == NULL) || (s->session->cert == NULL))
+       if ((s == NULL) || (s->session == NULL) || (s->session->sess_cert == NULL))
                r=NULL;
        else
-               r=s->session->cert->cert_chain;
+               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);
        }
 
@@ -506,18 +655,18 @@ void SSL_copy_session_id(SSL *t,SSL *f)
 int SSL_CTX_check_private_key(SSL_CTX *ctx)
        {
        if (    (ctx == NULL) ||
-               (ctx->default_cert == NULL) ||
-               (ctx->default_cert->key->x509 == NULL))
+               (ctx->cert == NULL) ||
+               (ctx->cert->key->x509 == NULL))
                {
                SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return(0);
                }
-       if      (ctx->default_cert->key->privatekey == NULL)
+       if      (ctx->cert->key->privatekey == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
                return(0);
                }
-       return(X509_check_private_key(ctx->default_cert->key->x509, ctx->default_cert->key->privatekey));
+       return(X509_check_private_key(ctx->cert->key->x509, ctx->cert->key->privatekey));
        }
 
 /* Fix this function so that it takes an optional type parameter */
@@ -529,7 +678,10 @@ int SSL_check_private_key(SSL *ssl)
                return(0);
                }
        if (ssl->cert == NULL)
-               return(SSL_CTX_check_private_key(ssl->ctx));
+               {
+                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
+               return 0;
+               }
        if (ssl->cert->key->x509 == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
@@ -546,11 +698,19 @@ int SSL_check_private_key(SSL *ssl)
 
 int SSL_accept(SSL *s)
        {
+       if (s->handshake_func == 0)
+               /* Not properly initialized yet */
+               SSL_set_accept_state(s);
+
        return(s->method->ssl_accept(s));
        }
 
 int SSL_connect(SSL *s)
        {
+       if (s->handshake_func == 0)
+               /* Not properly initialized yet */
+               SSL_set_connect_state(s);
+
        return(s->method->ssl_connect(s));
        }
 
@@ -561,6 +721,12 @@ long SSL_get_default_timeout(SSL *s)
 
 int SSL_read(SSL *s,char *buf,int num)
        {
+       if (s->handshake_func == 0)
+               {
+               SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
+               return -1;
+               }
+
        if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
                {
                s->rwstate=SSL_NOTHING;
@@ -580,6 +746,12 @@ int SSL_peek(SSL *s,char *buf,int num)
 
 int SSL_write(SSL *s,const char *buf,int num)
        {
+       if (s->handshake_func == 0)
+               {
+               SSLerr(SSL_F_SSL_WRITE, SSL_R_UNINITIALIZED);
+               return -1;
+               }
+
        if (s->shutdown & SSL_SENT_SHUTDOWN)
                {
                s->rwstate=SSL_NOTHING;
@@ -591,6 +763,18 @@ int SSL_write(SSL *s,const char *buf,int num)
 
 int SSL_shutdown(SSL *s)
        {
+       /* Note that this function behaves differently from what one might
+        * expect.  Return values are 0 for no success (yet),
+        * 1 for success; but calling it once is usually not enough,
+        * even if blocking I/O is used (see ssl3_shutdown).
+        */
+
+       if (s->handshake_func == 0)
+               {
+               SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
+               return -1;
+               }
+
        if ((s != NULL) && !SSL_in_init(s))
                return(s->method->ssl_shutdown(s));
        else
@@ -617,10 +801,25 @@ long SSL_ctrl(SSL *s,int cmd,long larg,char *parg)
                return(l);
        case SSL_CTRL_OPTIONS:
                return(s->options|=larg);
+       case SSL_CTRL_MODE:
+               return(s->mode|=larg);
        default:
                return(s->method->ssl_ctrl(s,cmd,larg,parg));
                }
-       return(0);
+       }
+
+long SSL_callback_ctrl(SSL *s, int cmd, void (*fp)())
+       {
+       switch(cmd)
+               {
+       default:
+               return(s->method->ssl_callback_ctrl(s,cmd,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)
@@ -675,13 +874,23 @@ long SSL_CTX_ctrl(SSL_CTX *ctx,int cmd,long larg,char *parg)
                return(ctx->stats.sess_cache_full);
        case SSL_CTRL_OPTIONS:
                return(ctx->options|=larg);
+       case SSL_CTRL_MODE:
+               return(ctx->mode|=larg);
        default:
                return(ctx->method->ssl_ctx_ctrl(ctx,cmd,larg,parg));
                }
-       return(0);
        }
 
-int ssl_cipher_id_cmp(SSL_CIPHER *a,SSL_CIPHER *b)
+long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)())
+       {
+       switch(cmd)
+               {
+       default:
+               return(ctx->method->ssl_ctx_callback_ctrl(ctx,cmd,fp));
+               }
+       }
+
+int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
        {
        long l;
 
@@ -692,7 +901,8 @@ 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;
 
@@ -736,7 +946,7 @@ STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
        }
 
 /** The old interface to get the same thing as SSL_get_ciphers() */
-char *SSL_get_cipher_list(SSL *s,int n)
+const char *SSL_get_cipher_list(SSL *s,int n)
        {
        SSL_CIPHER *c;
        STACK_OF(SSL_CIPHER) *sk;
@@ -750,8 +960,8 @@ char *SSL_get_cipher_list(SSL *s,int n)
        return(c->name);
        }
 
-/** specify the ciphers to be used by defaut by the SSL_CTX */
-int SSL_CTX_set_cipher_list(SSL_CTX *ctx,char *str)
+/** specify the ciphers to be used by default by the SSL_CTX */
+int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
        {
        STACK_OF(SSL_CIPHER) *sk;
        
@@ -762,7 +972,7 @@ int SSL_CTX_set_cipher_list(SSL_CTX *ctx,char *str)
        }
 
 /** specify the ciphers to be used by the SSL */
-int SSL_set_cipher_list(SSL *s,char *str)
+int SSL_set_cipher_list(SSL *s,const char *str)
        {
        STACK_OF(SSL_CIPHER) *sk;
        
@@ -775,7 +985,8 @@ int SSL_set_cipher_list(SSL *s,char *str)
 /* works well for SSLv2, not so good for SSLv3 */
 char *SSL_get_shared_ciphers(SSL *s,char *buf,int len)
        {
-       char *p,*cp;
+       char *p;
+       const char *cp;
        STACK_OF(SSL_CIPHER) *sk;
        SSL_CIPHER *c;
        int i;
@@ -839,7 +1050,7 @@ 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;
@@ -905,7 +1116,7 @@ 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;
 
@@ -944,11 +1155,13 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
 
        ret->read_ahead=0;
        ret->verify_mode=SSL_VERIFY_NONE;
+       ret->verify_depth=-1; /* Don't impose a limit (but x509_lu.c does) */
        ret->default_verify_callback=NULL;
-       if ((ret->default_cert=ssl_cert_new()) == NULL)
+       if ((ret->cert=ssl_cert_new()) == NULL)
                goto err;
 
        ret->default_passwd_callback=NULL;
+       ret->default_passwd_callback_userdata=NULL;
        ret->client_cert_cb=NULL;
 
        ret->sessions=lh_new(SSL_SESSION_hash,SSL_SESSION_cmp);
@@ -999,7 +1212,7 @@ err2:
        }
 
 static void SSL_COMP_free(SSL_COMP *comp)
-    { Free(comp); }
+    { OPENSSL_free(comp); }
 
 void SSL_CTX_free(SSL_CTX *a)
        {
@@ -1032,26 +1245,40 @@ void SSL_CTX_free(SSL_CTX *a)
                sk_SSL_CIPHER_free(a->cipher_list);
        if (a->cipher_list_by_id != NULL)
                sk_SSL_CIPHER_free(a->cipher_list_by_id);
-       if (a->default_cert != NULL)
-               ssl_cert_free(a->default_cert);
+       if (a->cert != NULL)
+               ssl_cert_free(a->cert);
        if (a->client_CA != NULL)
                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((char *)a);
+#else
+       a->comp_methods = NULL;
+#endif
+       OPENSSL_free(a);
        }
 
-void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx,int (*cb)())
+void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
        {
        ctx->default_passwd_callback=cb;
        }
 
-void SSL_CTX_set_cert_verify_cb(SSL_CTX *ctx,int (*cb)(),char *arg)
+void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx,void *u)
        {
+       ctx->default_passwd_callback_userdata=u;
+       }
+
+void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,int (*cb)(),char *arg)
+       {
+       /* now
+        *     int (*cb)(X509_STORE_CTX *),
+        * but should be
+        *     int (*cb)(X509_STORE_CTX *, void *arg)
+        */
        ctx->app_verify_callback=cb;
-       ctx->app_verify_arg=arg;
+       ctx->app_verify_arg=arg; /* never used */
        }
 
 void SSL_CTX_set_verify(SSL_CTX *ctx,int mode,int (*cb)(int, X509_STORE_CTX *))
@@ -1062,10 +1289,12 @@ void SSL_CTX_set_verify(SSL_CTX *ctx,int mode,int (*cb)(int, X509_STORE_CTX *))
        X509_STORE_set_verify_cb_func(ctx->cert_store,cb);
        }
 
-/* Need default_cert to check for callbacks, for now (see comment in CERT
-   strucure)
-*/
-void ssl_set_cert_masks(CERT *c,CERT *default_cert,SSL_CIPHER *cipher)
+void SSL_CTX_set_verify_depth(SSL_CTX *ctx,int depth)
+       {
+       ctx->verify_depth=depth;
+       }
+
+void ssl_set_cert_masks(CERT *c, SSL_CIPHER *cipher)
        {
        CERT_PKEY *cpk;
        int rsa_enc,rsa_tmp,rsa_sign,dh_tmp,dh_rsa,dh_dsa,dsa_sign;
@@ -1078,15 +1307,15 @@ void ssl_set_cert_masks(CERT *c,CERT *default_cert,SSL_CIPHER *cipher)
        kl=SSL_C_EXPORT_PKEYLENGTH(cipher);
 
 #ifndef NO_RSA
-       rsa_tmp=(c->rsa_tmp != NULL || default_cert->rsa_tmp_cb != NULL);
-       rsa_tmp_export=(default_cert->rsa_tmp_cb != NULL ||
+       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
-       dh_tmp=(c->dh_tmp != NULL || default_cert->dh_tmp_cb != NULL);
-       dh_tmp_export=(default_cert->dh_tmp_cb != NULL ||
+       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));
 #else
        dh_tmp=dh_tmp_export=0;
@@ -1155,9 +1384,12 @@ void ssl_set_cert_masks(CERT *c,CERT *default_cert,SSL_CIPHER *cipher)
                emask|=SSL_aDSS;
                }
 
-#ifdef SSL_ALLOW_ADH
        mask|=SSL_aNULL;
        emask|=SSL_aNULL;
+
+#ifndef NO_KRB5
+       mask|=SSL_kKRB5|SSL_aKRB5;
+       emask|=SSL_kKRB5|SSL_aKRB5;
 #endif
 
        c->mask=mask;
@@ -1170,13 +1402,13 @@ X509 *ssl_get_server_send_cert(SSL *s)
        {
        unsigned long alg,mask,kalg;
        CERT *c;
-       int i,export;
+       int i,is_export;
 
        c=s->cert;
-       ssl_set_cert_masks(c,s->ctx->default_cert,s->s3->tmp.new_cipher);
+       ssl_set_cert_masks(c, s->s3->tmp.new_cipher);
        alg=s->s3->tmp.new_cipher->algorithms;
-       export=SSL_IS_EXPORT(alg);
-       mask=export?c->export_mask:c->mask;
+       is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
+       mask=is_export?c->export_mask:c->mask;
        kalg=alg&(SSL_MKEY_MASK|SSL_AUTH_MASK);
 
        if      (kalg & SSL_kDHr)
@@ -1192,6 +1424,11 @@ 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);
@@ -1316,12 +1553,23 @@ int SSL_get_error(SSL *s,int i)
                if (BIO_should_read(bio))
                        return(SSL_ERROR_WANT_READ);
                else if (BIO_should_write(bio))
+                       /* This one doesn't make too much sense ... We never try
+                        * to write to the rbio, and an application program where
+                        * rbio and wbio are separate couldn't even know what it
+                        * should wait for.
+                        * However if we ever set s->rwstate incorrectly
+                        * (so that we have SSL_want_read(s) instead of
+                        * SSL_want_write(s)) and rbio and wbio *are* the same,
+                        * this test works around that bug; so it might be safer
+                        * to keep it. */
                        return(SSL_ERROR_WANT_WRITE);
                else if (BIO_should_io_special(bio))
                        {
                        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 */
                        }
@@ -1333,12 +1581,15 @@ int SSL_get_error(SSL *s,int i)
                if (BIO_should_write(bio))
                        return(SSL_ERROR_WANT_WRITE);
                else if (BIO_should_read(bio))
+                       /* See above (SSL_want_read(s) with BIO_should_write(bio)) */
                        return(SSL_ERROR_WANT_READ);
                else if (BIO_should_io_special(bio))
                        {
                        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);
                        }
@@ -1418,7 +1669,7 @@ SSL_METHOD *ssl_bad_method(int ver)
        return(NULL);
        }
 
-char *SSL_get_version(SSL *s)
+const char *SSL_get_version(SSL *s)
        {
        if (s->version == TLS1_VERSION)
                return("TLSv1");
@@ -1431,21 +1682,45 @@ char *SSL_get_version(SSL *s)
        }
 
 SSL *SSL_dup(SSL *s)
-        {
+       {
        STACK_OF(X509_NAME) *sk;
        X509_NAME *xn;
-        SSL *ret;
+       SSL *ret;
        int i;
                 
        if ((ret=SSL_new(SSL_get_SSL_CTX(s))) == NULL)
            return(NULL);
                          
-       /* This copies version, session-id, SSL_METHOD and 'cert' */
-       SSL_copy_session_id(ret,s);
+       if (s->session != NULL)
+               {
+               /* This copies session-id, SSL_METHOD, sid_ctx, and 'cert' */
+               SSL_copy_session_id(ret,s);
+               }
+       else
+               {
+               /* No session has been established yet, so we have to expect
+                * that s->cert or ret->cert will be changed later --
+                * they should not both point to the same object,
+                * and thus we can't use SSL_copy_session_id. */
+
+               ret->method = s->method;
+               ret->method->ssl_new(ret);
+
+               if (s->cert != NULL)
+                       {
+                       ret->cert = ssl_cert_dup(s->cert);
+                       if (ret->cert == NULL)
+                               goto err;
+                       }
+                               
+               SSL_set_session_id_context(ret,
+                       s->sid_ctx, s->sid_ctx_length);
+               }
 
        SSL_set_read_ahead(ret,SSL_get_read_ahead(s));
        SSL_set_verify(ret,SSL_get_verify_mode(s),
                SSL_get_verify_callback(s));
+       SSL_set_verify_depth(ret,SSL_get_verify_depth(s));
 
        SSL_set_info_callback(ret,SSL_get_info_callback(s));
        
@@ -1516,18 +1791,18 @@ err:
 
 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);
-                s->enc_read_ctx=NULL;
-                }
-        if (s->enc_write_ctx != NULL)
-                {
-                EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
-                Free(s->enc_write_ctx);
-                s->enc_write_ctx=NULL;
-                }
+       if (s->enc_read_ctx != NULL)
+               {
+               EVP_CIPHER_CTX_cleanup(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);
+               OPENSSL_free(s->enc_write_ctx);
+               s->enc_write_ctx=NULL;
+               }
        if (s->expand != NULL)
                {
                COMP_CTX_free(s->expand);
@@ -1560,9 +1835,9 @@ EVP_PKEY *SSL_get_privatekey(SSL *s)
 
 SSL_CIPHER *SSL_get_current_cipher(SSL *s)
        {
-        if ((s->session != NULL) && (s->session->cipher != NULL))
-                return(s->session->cipher);
-        return(NULL);
+       if ((s->session != NULL) && (s->session->cipher != NULL))
+               return(s->session->cipher);
+       return(NULL);
        }
 
 int ssl_init_wbio_buffer(SSL *s,int push)
@@ -1581,7 +1856,7 @@ int ssl_init_wbio_buffer(SSL *s,int push)
                if (s->bbio == s->wbio)
                        s->wbio=BIO_pop(s->wbio);
                }
-       BIO_reset(bbio);
+       (void)BIO_reset(bbio);
 /*     if (!BIO_set_write_buffer_size(bbio,16*1024)) */
        if (!BIO_set_read_buffer_size(bbio,1))
                {
@@ -1603,19 +1878,16 @@ 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;
        }
@@ -1666,7 +1938,8 @@ int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
        return(X509_STORE_set_default_paths(ctx->cert_store));
        }
 
-int SSL_CTX_load_verify_locations(SSL_CTX *ctx,char *CAfile,char *CApath)
+int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
+               const char *CApath)
        {
        return(X509_STORE_load_locations(ctx->cert_store,CAfile,CApath));
        }
@@ -1677,7 +1950,7 @@ void SSL_set_info_callback(SSL *ssl,void (*cb)())
        ssl->info_callback=cb;
        }
 
-void (*SSL_get_info_callback(SSL *ssl))()
+void (*SSL_get_info_callback(SSL *ssl))(void)
        {
        return((void (*)())ssl->info_callback);
        }
@@ -1697,13 +1970,13 @@ long SSL_get_verify_result(SSL *ssl)
        return(ssl->verify_result);
        }
 
-int SSL_get_ex_new_index(long argl,char *argp,int (*new_func)(),
-                        int (*dup_func)(),void (*free_func)())
-        {
+int SSL_get_ex_new_index(long argl,void *argp,CRYPTO_EX_new *new_func,
+                        CRYPTO_EX_dup *dup_func,CRYPTO_EX_free *free_func)
+       {
        ssl_meth_num++;
        return(CRYPTO_get_ex_new_index(ssl_meth_num-1,
                &ssl_meth,argl,argp,new_func,dup_func,free_func));
-        }
+       }
 
 int SSL_set_ex_data(SSL *s,int idx,void *arg)
        {
@@ -1715,13 +1988,13 @@ void *SSL_get_ex_data(SSL *s,int idx)
        return(CRYPTO_get_ex_data(&s->ex_data,idx));
        }
 
-int SSL_CTX_get_ex_new_index(long argl,char *argp,int (*new_func)(),
-                            int (*dup_func)(),void (*free_func)())
-        {
+int SSL_CTX_get_ex_new_index(long argl,void *argp,CRYPTO_EX_new *new_func,
+                            CRYPTO_EX_dup *dup_func,CRYPTO_EX_free *free_func)
+       {
        ssl_ctx_meth_num++;
        return(CRYPTO_get_ex_new_index(ssl_ctx_meth_num-1,
                &ssl_ctx_meth,argl,argp,new_func,dup_func,free_func));
-        }
+       }
 
 int SSL_CTX_set_ex_data(SSL_CTX *s,int idx,void *arg)
        {
@@ -1761,22 +2034,34 @@ int SSL_want(SSL *s)
  * \param cb the callback
  */
 
-void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,RSA *(*cb)(SSL *ssl,int export,
+#ifndef NO_RSA
+void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,RSA *(*cb)(SSL *ssl,
+                                                         int is_export,
                                                          int keylength))
-    { SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_RSA_CB,0,(char *)cb); }
+    {
+    SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_RSA_CB,(void (*)())cb);
+    }
+
+void SSL_set_tmp_rsa_callback(SSL *ssl,RSA *(*cb)(SSL *ssl,
+                                                 int is_export,
+                                                 int keylength))
+    {
+    SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_RSA_CB,(void (*)())cb);
+    }
+#endif
 
 #ifdef DOXYGEN
 /*!
  * \brief The RSA temporary key callback function.
  * \param ssl the SSL session.
- * \param export \c TRUE if the temp RSA key is for an export ciphersuite.
- * \param keylength if \c export is \c TRUE, then \c keylength is the size of
- * the required key in bits.
+ * \param is_export \c TRUE if the temp RSA key is for an export ciphersuite.
+ * \param keylength if \c is_export is \c TRUE, then \c keylength is the size
+ * of the required key in bits.
  * \return the temporary RSA key.
  * \sa SSL_CTX_set_tmp_rsa_callback, SSL_set_tmp_rsa_callback
  */
 
-RSA *cb(SSL *ssl,int export,int keylength)
+RSA *cb(SSL *ssl,int is_export,int keylength)
     {}
 #endif
 
@@ -1786,17 +2071,19 @@ RSA *cb(SSL *ssl,int export,int keylength)
  * \param dh the callback
  */
 
-void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,DH *(*dh)(SSL *ssl,int export,
+#ifndef NO_DH
+void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,DH *(*dh)(SSL *ssl,int is_export,
                                                        int keylength))
-    { SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_DH_CB,0,(char *)dh); }
-
-void SSL_set_tmp_rsa_callback(SSL *ssl,RSA *(*cb)(SSL *ssl,int export,
-                                                         int keylength))
-    { SSL_ctrl(ssl,SSL_CTRL_SET_TMP_RSA_CB,0,(char *)cb); }
+    {
+    SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_DH_CB,(void (*)())dh);
+    }
 
-void SSL_set_tmp_dh_callback(SSL *ssl,DH *(*dh)(SSL *ssl,int export,
-                                                       int keylength))
-    { SSL_ctrl(ssl,SSL_CTRL_SET_TMP_DH_CB,0,(char *)dh); }
+void SSL_set_tmp_dh_callback(SSL *ssl,DH *(*dh)(SSL *ssl,int is_export,
+                                               int keylength))
+    {
+    SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_DH_CB,(void (*)())dh);
+    }
+#endif
 
 #if defined(_WINDLL) && defined(WIN16)
 #include "../crypto/bio/bss_file.c"