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eigrpd: Fix a md5 digest issue

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Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2017-05-10 19:45:40 -04:00
parent 89bb508b99
commit 5da387853b
1 changed files with 7 additions and 5 deletions
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12
eigrpd/eigrp_packet.c
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@ -161,6 +161,7 @@ int eigrp_check_md5_digest(struct stream *s,
{
MD5_CTX ctx;
unsigned char digest[EIGRP_AUTH_TYPE_MD5_LEN];
unsigned char orig[EIGRP_AUTH_TYPE_MD5_LEN];
struct key *key = NULL;
struct keychain *keychain;
u_char *ibuf;
@ -181,7 +182,9 @@ int eigrp_check_md5_digest(struct stream *s,
auth_TLV = (struct TLV_MD5_Authentication_Type *)(s->data
+ EIGRP_HEADER_LEN);
memset(auth_TLV->digest, 0, sizeof(auth_TLV->digest));
memcpy(orig, auth_TLV->digest, EIGRP_AUTH_TYPE_MD5_LEN);
memset(digest, 0, EIGRP_AUTH_TYPE_MD5_LEN);
memset(auth_TLV->digest, 0, EIGRP_AUTH_TYPE_MD5_LEN);
ibuf = s->data;
backup_end = s->endp;
@ -219,16 +222,15 @@ int eigrp_check_md5_digest(struct stream *s,
MD5Final(digest, &ctx);
/* compare the two */
if (memcmp(authTLV->digest, digest, EIGRP_AUTH_TYPE_MD5_LEN) == 0) {
zlog_debug("VSETKO OK");
} else {
if (memcmp(orig, digest, EIGRP_AUTH_TYPE_MD5_LEN) != 0) {
zlog_warn("interface %s: eigrp_check_md5 checksum mismatch",
IF_NAME(nbr->ei));
return 0;
}
/* save neighbor's crypt_seqnum */
nbr->crypt_seqnum = authTLV->key_sequence;
if (nbr)
nbr->crypt_seqnum = authTLV->key_sequence;
return 1;
}