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BUG/MINOR: ssl: ssl_sock_parse_clienthello ignores session id

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In ssl_sock_parse_clienthello(), the code considers that SSL Sessionid
size is '1', and then considers that the SSL cipher suite is availble
right after the session id size information.
This actually works in a single case, when the client does not send a
session id.

This patch fixes this issue by introducing the a propoer way to parse
the session id and move forward the cursor by the session id length when
required.

Need to be backported to 1.8.
This commit is contained in:
Baptiste Assmann 2018-11-28 15:20:25 +01:00 committed by Willy Tarreau
parent 1ced485b29
commit 6be139f867
1 changed files with 12 additions and 3 deletions
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15
src/ssl_sock.c
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@ -1561,10 +1561,19 @@ void ssl_sock_parse_clienthello(int write_p, int version, int content_type,
/* Expect 2 bytes for protocol version (1 byte for major and 1 byte
* for minor, the random, composed by 4 bytes for the unix time and
* 28 bytes for unix payload, and them 1 byte for the session id. So
* we jump 1 + 1 + 4 + 28 + 1 bytes.
* 28 bytes for unix payload. So we jump 1 + 1 + 4 + 28.
*/
msg += 1 + 1 + 4 + 28 + 1;
msg += 1 + 1 + 4 + 28;
if (msg > end)
return;
/* Next, is session id:
* if present, we have to jump by length + 1 for the size information
* if not present, we have to jump by 1 only
*/
if (msg[0] > 0)
msg += msg[0];
msg += 1;
if (msg > end)
return;