diff options
| -rw-r--r-- | ssl/s3_srvr.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c index a1eb02e5e2..fe7f6850ba 100644 --- a/ssl/s3_srvr.c +++ b/ssl/s3_srvr.c @@ -779,6 +779,16 @@ int ssl3_get_client_hello(SSL *s) d = p = (unsigned char *)s->init_msg; /* + * 2 bytes for client version, SSL3_RANDOM_SIZE bytes for random, 1 byte + * for session id length + */ + if (n < 2 + SSL3_RANDOM_SIZE + 1) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + + /* * use version from inside client hello, not from record header (may * differ: see RFC 2246, Appendix E, second paragraph) */ @@ -808,6 +818,12 @@ int ssl3_get_client_hello(SSL *s) unsigned int session_length, cookie_length; session_length = *(p + SSL3_RANDOM_SIZE); + + if (p + SSL3_RANDOM_SIZE + session_length + 1 >= d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1); if (cookie_length == 0) @@ -821,6 +837,12 @@ int ssl3_get_client_hello(SSL *s) /* get the session-id */ j = *(p++); + if (p + j > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + s->hit = 0; /* * Versions before 0.9.7 always allow session reuse during renegotiation @@ -852,8 +874,19 @@ int ssl3_get_client_hello(SSL *s) if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) { /* cookie stuff */ + if (p + 1 > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } cookie_len = *(p++); + if (p + cookie_len > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + /* * The ClientHello may contain a cookie even if the * HelloVerify message has not been sent--make sure that it @@ -894,6 +927,11 @@ int ssl3_get_client_hello(SSL *s) p += cookie_len; } + if (p + 2 > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } n2s(p, i); if ((i == 0) && (j != 0)) { /* we need a cipher if we are not resuming a session */ @@ -901,7 +939,9 @@ int ssl3_get_client_hello(SSL *s) SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED); goto f_err; } - if ((p + i) >= (d + n)) { + + /* i bytes of cipher data + 1 byte for compression length later */ + if ((p + i + 1) > (d + n)) { /* not enough data */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); |