Change ssl3_get_message and the functions using it so that complete
[openssl.git] / ssl / s3_both.c
index cd97280..409120b 100644 (file)
  *
  */
 
+#include <limits.h>
 #include <string.h>
 #include <stdio.h>
 #include <openssl/buffer.h>
@@ -205,7 +206,7 @@ int ssl3_get_finished(SSL *s, int a, int b)
                }
        s->s3->change_cipher_spec=0;
 
-       p = (unsigned char *)s->init_buf->data;
+       p = (unsigned char *)s->init_msg;
        i = s->s3->tmp.peer_finish_md_len;
 
        if (i != n)
@@ -355,6 +356,7 @@ long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
                        goto f_err;
                        }
                *ok=1;
+               s->init_msg = s->init_buf->data + 4;
                return((int)s->s3->tmp.message_size);
                }
 
@@ -415,8 +417,6 @@ long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
                        ssl3_init_finished_mac(s);
                        }
 
-               ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 4);
-                       
                s->s3->tmp.message_type= *(p++);
 
                n2l3(p,l);
@@ -426,7 +426,13 @@ long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
                        SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
                        goto f_err;
                        }
-               if (l && !BUF_MEM_grow(s->init_buf,(int)l))
+               if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
+                       {
+                       al=SSL_AD_ILLEGAL_PARAMETER;
+                       SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
+                       goto f_err;
+                       }
+               if (l && !BUF_MEM_grow(s->init_buf,(int)l+4))
                        {
                        SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
                        goto err;
@@ -434,13 +440,13 @@ long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
                s->s3->tmp.message_size=l;
                s->state=stn;
 
-               s->init_num=0;
+               s->init_msg = s->init_buf->data + 4;
+               s->init_num = 0;
                }
 
        /* next state (stn) */
-       p=(unsigned char *)s->init_buf->data;
-       n=s->s3->tmp.message_size;
-       n -= s->init_num;
+       p = s->init_msg;
+       n = s->s3->tmp.message_size - s->init_num;
        while (n > 0)
                {
                i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
@@ -453,7 +459,7 @@ long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
                s->init_num += i;
                n -= i;
                }
-       ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num);
+       ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
        *ok=1;
        return s->init_num;
 f_err: