From: David Disseldorp ddiss@suse.de
[ Upstream commit 9cef2a7955f2754257a7cddedec16edae7b587d0 ]
RFC 2307 states:
For CHAP [RFC1994], in the first step, the initiator MUST send:
CHAP_A=<A1,A2...>
Where A1,A2... are proposed algorithms, in order of preference. ... For the Algorithm, as stated in [RFC1994], one value is required to be implemented:
5 (CHAP with MD5)
LIO currently checks for this value by only comparing a single byte in the tokenized Algorithm string, which means that any value starting with a '5' (e.g. "55") is interpreted as "CHAP with MD5". Fix this by comparing the entire tokenized string.
Reviewed-by: Lee Duncan lduncan@suse.com Reviewed-by: Mike Christie mchristi@redhat.com Signed-off-by: David Disseldorp ddiss@suse.de Link: https://lore.kernel.org/r/20190912095547.22427-2-ddiss@suse.de Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/target/iscsi/iscsi_target_auth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/iscsi/iscsi_target_auth.c b/drivers/target/iscsi/iscsi_target_auth.c index 3184e023a0529..1dd6028eccb99 100644 --- a/drivers/target/iscsi/iscsi_target_auth.c +++ b/drivers/target/iscsi/iscsi_target_auth.c @@ -74,7 +74,7 @@ static int chap_check_algorithm(const char *a_str) if (!token) goto out;
- if (!strncmp(token, "5", 1)) { + if (!strcmp(token, "5")) { pr_debug("Selected MD5 Algorithm\n"); kfree(orig); return CHAP_DIGEST_MD5;