ignore Client Hellos when we're in handshake anyway
[openssl.git] / ssl / s3_both.c
index 251bcedd7d5931a6eb444385c9435c2ddbdf3ad2..4d8cafe2be48b9c9671bdfa50c5892a6a5be2457 100644 (file)
  * [including the GNU Public Licence.]
  */
 
+#include <string.h>
 #include <stdio.h>
-#include "buffer.h"
-#include "rand.h"
-#include "objects.h"
-#include "evp.h"
-#include "x509.h"
+#include <openssl/buffer.h>
+#include <openssl/rand.h>
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+#include <openssl/x509.h>
 #include "ssl_locl.h"
 
-#define BREAK  break
-
-/* SSL3err(SSL_F_SSL3_GET_FINISHED,SSL_R_EXCESSIVE_MESSAGE_SIZE);
- */
-
-int ssl3_send_finished(s,a,b,sender,slen)
-SSL *s;
-int a;
-int b;
-unsigned char *sender;
-int slen;
+int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
        {
        unsigned char *p,*d;
        int i;
@@ -88,7 +79,9 @@ int slen;
                i=s->method->ssl3_enc->final_finish_mac(s,
                        &(s->s3->finish_dgst1),
                        &(s->s3->finish_dgst2),
-                       sender,slen,p);
+                       sender,slen,s->s3->tmp.finish_md);
+               s->s3->tmp.finish_md_len = i;
+               memcpy(p, s->s3->tmp.finish_md, i);
                p+=i;
                l=i;
 
@@ -111,17 +104,14 @@ int slen;
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
        }
 
-int ssl3_get_finished(s,a,b)
-SSL *s;
-int a;
-int b;
+int ssl3_get_finished(SSL *s, int a, int b)
        {
        int al,i,ok;
        long n;
        unsigned char *p;
 
        /* the mac has already been generated when we received the
-        * change cipher spec message and is in s->s3->tmp.in_dgst[12]
+        * change cipher spec message and is in s->s3->tmp.peer_finish_md
         */ 
 
        n=ssl3_get_message(s,
@@ -133,7 +123,7 @@ int b;
 
        if (!ok) return((int)n);
 
-       /* If this occurs if we has missed a message */
+       /* If this occurs, we have missed a message */
        if (!s->s3->change_cipher_spec)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
@@ -142,9 +132,8 @@ int b;
                }
        s->s3->change_cipher_spec=0;
 
-       p=(unsigned char *)s->init_buf->data;
-
-       i=s->method->ssl3_enc->finish_mac_length;
+       p = (unsigned char *)s->init_buf->data;
+       i = s->s3->tmp.peer_finish_md_len;
 
        if (i != n)
                {
@@ -153,7 +142,7 @@ int b;
                goto f_err;
                }
 
-       if (memcmp(  p,    (char *)&(s->s3->tmp.finish_md[0]),i) != 0)
+       if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
                {
                al=SSL_AD_DECRYPT_ERROR;
                SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
@@ -174,9 +163,7 @@ f_err:
  * ssl->session->read_compression      assign
  * ssl->session->read_hash             assign
  */
-int ssl3_send_change_cipher_spec(s,a,b)
-SSL *s;
-int a,b;
+int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
        { 
        unsigned char *p;
 
@@ -194,9 +181,7 @@ int a,b;
        return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
        }
 
-unsigned long ssl3_output_cert_chain(s,x)
-SSL *s;
-X509 *x;
+unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
        {
        unsigned char *p;
        int n,i;
@@ -243,11 +228,11 @@ X509 *x;
                X509_STORE_CTX_cleanup(&xs_ctx);
                }
 
-       /* Thwate special :-) */
+       /* Thawte special :-) */
        if (s->ctx->extra_certs != NULL)
-       for (i=0; i<sk_num(s->ctx->extra_certs); i++)
+       for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
                {
-               x=(X509 *)sk_value(s->ctx->extra_certs,i);
+               x=sk_X509_value(s->ctx->extra_certs,i);
                n=i2d_X509(x,NULL);
                if (!BUF_MEM_grow(buf,(int)(n+l+3)))
                        {
@@ -271,11 +256,12 @@ X509 *x;
        return(l);
        }
 
-long ssl3_get_message(s,st1,stn,mt,max,ok)
-SSL *s;
-int st1,stn,mt;
-long max;
-int *ok;
+/* Obtain handshake message of message type 'mt' (any if mt == -1),
+ * maximum acceptable body length 'max'.
+ * The first four bytes (msg_type and length) are read in state 'st1',
+ * the body is read in state 'stn'.
+ */
+long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
        {
        unsigned char *p;
        unsigned long l;
@@ -297,16 +283,35 @@ int *ok;
 
        p=(unsigned char *)s->init_buf->data;
 
-       if (s->state == st1)
+       if (s->state == st1) /* s->init_num < 4 */
                {
-               i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
-                       (char *)&(p[s->init_num]),
-                       4-s->init_num);
-               if (i < (4-s->init_num))
+               int skip_message;
+
+               do
                        {
-                       *ok=0;
-                       return(ssl3_part_read(s,i));
+                       while (s->init_num < 4)
+                               {
+                               i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
+                                       4-s->init_num);
+                               if (i <= 0)
+                                       {
+                                       s->rwstate=SSL_READING;
+                                       *ok = 0;
+                                       return i;
+                                       }
+                               s->init_num+=i;
+                               }
+                       
+                       skip_message = 0;
+                       if (!s->server)
+                               if (p[0] == SSL3_MT_HELLO_REQUEST)
+                                       /* The server may always send 'Hello Request' messages --
+                                        * we are doing a handshake anyway now, so ignore them
+                                        * if their format is correct */
+                                       if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
+                                               skip_message = 1;
                        }
+               while (skip_message);
 
                if ((mt >= 0) && (*p != mt))
                        {
@@ -314,6 +319,18 @@ int *ok;
                        SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
                        goto f_err;
                        }
+               if((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
+                                       (st1 == SSL3_ST_SR_CERT_A) &&
+                                       (stn == SSL3_ST_SR_CERT_B))
+                       {
+                       /* At this point we have got an MS SGC second client
+                        * hello. We need to restart the mac and mac the data
+                        * currently received.
+                        */
+                       ssl3_init_finished_mac(s);
+                       ssl3_finish_mac(s, p + s->init_num, i);
+                       }
+                       
                s->s3->tmp.message_type= *(p++);
 
                n2l3(p,l);
@@ -337,18 +354,20 @@ int *ok;
        /* next state (stn) */
        p=(unsigned char *)s->init_buf->data;
        n=s->s3->tmp.message_size;
-       if (n > 0)
+       while (n > 0)
                {
-               i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,
-                       (char *)&(p[s->init_num]),(int)n);
-               if (i != (int)n)
+               i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n);
+               if (i <= 0)
                        {
-                       *ok=0;
-                       return(ssl3_part_read(s,i));
+                       s->rwstate=SSL_READING;
+                       *ok = 0;
+                       return i;
                        }
+               s->init_num += i;
+               n -= i;
                }
        *ok=1;
-       return(n);
+       return s->init_num;
 f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
 err:
@@ -356,9 +375,7 @@ err:
        return(-1);
        }
 
-int ssl_cert_type(x,pkey)
-X509 *x;
-EVP_PKEY *pkey;
+int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
        {
        EVP_PKEY *pk;
        int ret= -1,i,j;
@@ -404,11 +421,11 @@ EVP_PKEY *pkey;
                ret= -1;
 
 err:
+       if(!pkey) EVP_PKEY_free(pk);
        return(ret);
        }
 
-int ssl_verify_alarm_type(type)
-long type;
+int ssl_verify_alarm_type(long type)
        {
        int al;
 
@@ -460,8 +477,7 @@ long type;
        return(al);
        }
 
-int ssl3_setup_buffers(s)
-SSL *s;
+int ssl3_setup_buffers(SSL *s)
        {
        unsigned char *p;
        unsigned int extra;
@@ -472,7 +488,7 @@ SSL *s;
                        extra=SSL3_RT_MAX_EXTRA;
                else
                        extra=0;
-               if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
+               if ((p=Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
                        == NULL)
                        goto err;
                s->s3->rbuf.buf=p;
@@ -480,7 +496,7 @@ SSL *s;
 
        if (s->s3->wbuf.buf == NULL)
                {
-               if ((p=(unsigned char *)Malloc(SSL3_RT_MAX_PACKET_SIZE))
+               if ((p=Malloc(SSL3_RT_MAX_PACKET_SIZE))
                        == NULL)
                        goto err;
                s->s3->wbuf.buf=p;