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mschaputil: Exlude domain name from challenge generation

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This commit is contained in:
Tim Kourt 2019-01-10 14:34:20 -08:00 committed by Denis Kenzior
parent 58f7b06c01
commit cd00416168
1 changed files with 20 additions and 3 deletions
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23
src/mschaputil.c
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@ -113,6 +113,20 @@ bool mschap_nt_password_hash(const char *password, uint8_t *password_hash)
return true;
}
static const char *mschapv2_exlude_domain_name(const char *username)
{
const char *c;
for (c = username; *c; c++) {
if (*c != '\\')
continue;
return c + 1;
}
return username;
}
/**
* Internal function to generate the challenge used in nt_response
* https://tools.ietf.org/html/rfc2759
@ -125,8 +139,9 @@ bool mschap_nt_password_hash(const char *password, uint8_t *password_hash)
* Returns: true on success, false if hash/encrypt couldn't be done
**/
static bool mschapv2_challenge_hash(const uint8_t *peer_challenge,
const uint8_t *server_challenge,
const char *user, uint8_t challenge[static 8])
const uint8_t *server_challenge,
const char *username,
uint8_t challenge[static 8])
{
struct l_checksum *check;
@ -134,9 +149,11 @@ static bool mschapv2_challenge_hash(const uint8_t *peer_challenge,
if (!check)
return false;
username = mschapv2_exlude_domain_name(username);
l_checksum_update(check, peer_challenge, 16);
l_checksum_update(check, server_challenge, 16);
l_checksum_update(check, user, strlen(user));
l_checksum_update(check, username, strlen(username));
l_checksum_get_digest(check, challenge, 8);
l_checksum_free(check);