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iscsi-target: fix chap identifier simple_strtoul usage 

This patch makes chap_server_compute_md5() use proper unsigned long
usage for the CHAP_I (identifier) and check for values beyond 255 as
per RFC-1994.

Reported-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2011-11-28 01:02:07 -08:00
parent 8359cf43b9
commit bc704fb58f
1 changed files with 7 additions and 3 deletions
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10
drivers/target/iscsi/iscsi_target_auth.c
View File

@ -165,7 +165,8 @@ static int chap_server_compute_md5(
unsigned int *nr_out_len)
{
char *endptr;
unsigned char id, digest[MD5_SIGNATURE_SIZE];
unsigned long id;
unsigned char digest[MD5_SIGNATURE_SIZE];
unsigned char type, response[MD5_SIGNATURE_SIZE * 2 + 2];
unsigned char identifier[10], *challenge = NULL;
unsigned char *challenge_binhex = NULL;
@ -304,15 +305,18 @@ static int chap_server_compute_md5(
goto out;
}
/* FIXME: What happens when simple_strtoul() return 256, 257, etc.? */
if (type == HEX)
id = simple_strtoul(&identifier[2], &endptr, 0);
else
id = simple_strtoul(identifier, &endptr, 0);
if (id > 255) {
pr_err("chap identifier: %lu greater than 255\n", id);
goto out;
}
/*
* RFC 1994 says Identifier is no more than octet (8 bits).
*/
pr_debug("[server] Got CHAP_I=%d\n", id);
pr_debug("[server] Got CHAP_I=%lu\n", id);
/*
* Get CHAP_C.
*/