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Bug fixes to authentication code by Eric Leblond <eleblond@init-sys.com>.

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This commit is contained in:
Martin Mares 2003-04-06 18:38:01 +00:00
parent d85e1f0e2f
commit 8cf76fa853
1 changed files with 19 additions and 18 deletions
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37
proto/rip/auth.c
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@ -3,10 +3,12 @@
* *
* Copyright (c) 1999 Pavel Machek <pavel@ucw.cz> * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
* *
* Bug fixes by Eric Leblond <eleblond@init-sys.com>, April 2003
*
* Can be freely distributed and used under the terms of the GNU GPL. * Can be freely distributed and used under the terms of the GNU GPL.
*/ */
#define LOCAL_DEBUG #undef LOCAL_DEBUG
#include "nest/bird.h" #include "nest/bird.h"
#include "nest/iface.h" #include "nest/iface.h"
@ -33,7 +35,7 @@ int
rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num, ip_addr whotoldme ) rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num, ip_addr whotoldme )
{ {
DBG( "Incoming authentication: " ); DBG( "Incoming authentication: " );
switch (block->authtype) { /* Authentication type */ switch (ntohs(block->authtype)) { /* Authentication type */
case AT_PLAINTEXT: case AT_PLAINTEXT:
{ {
struct password_item *passwd = get_best_password( P_CF->passwords, 0 ); struct password_item *passwd = get_best_password( P_CF->passwords, 0 );
@ -54,14 +56,13 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
{ {
struct password_item *head; struct password_item *head;
struct rip_md5_tail *tail; struct rip_md5_tail *tail;
if (ntohs(block->packetlen) != PACKETLEN(num) - sizeof(struct rip_md5_tail) ) {
if (block->packetlen != PACKETLEN(num)) {
log( L_ERR "Packet length in MD5 does not match computed value" ); log( L_ERR "Packet length in MD5 does not match computed value" );
return 1; return 1;
} }
tail = (struct rip_md5_tail *) ((char *) packet + (block->packetlen - sizeof(struct rip_block_auth))); tail = (struct rip_md5_tail *) ((char *) packet + (ntohs(block->packetlen) ));
if ((tail->mustbeFFFF != 0xffff) || (tail->mustbe0001 != 0x0001)) { if ((tail->mustbeFFFF != 0xffff) || (tail->mustbe0001 != 0x0100)) {
log( L_ERR "MD5 tail signature is not there" ); log( L_ERR "MD5 tail signature is not there" );
return 1; return 1;
} }
@ -89,13 +90,13 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
char md5sum_packet[16]; char md5sum_packet[16];
char md5sum_computed[16]; char md5sum_computed[16];
memset(md5sum_packet,0,16);
memcpy(md5sum_packet, tail->md5, 16); memcpy(md5sum_packet, tail->md5, 16);
password_strncpy(tail->md5, head->password, 16); password_strncpy(tail->md5, head->password, 16);
MD5Init(&ctxt); MD5Init(&ctxt);
MD5Update(&ctxt, (char *) packet, block->packetlen ); MD5Update(&ctxt, (char *) packet, ntohs(block->packetlen) + sizeof(struct rip_block_auth) );
MD5Final(md5sum_computed, &ctxt); MD5Final(md5sum_computed, &ctxt);
if (memcmp(md5sum_packet, md5sum_computed, 16)) if (memcmp(md5sum_packet, md5sum_computed, 16))
return 1; return 1;
return 0; return 0;
@ -129,7 +130,7 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
return PACKETLEN(num); return PACKETLEN(num);
} }
block->authtype = P_CF->authtype; block->authtype = htons(P_CF->authtype);
block->mustbeFFFF = 0xffff; block->mustbeFFFF = 0xffff;
switch (P_CF->authtype) { switch (P_CF->authtype) {
case AT_PLAINTEXT: case AT_PLAINTEXT:
@ -139,26 +140,26 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
{ {
struct rip_md5_tail *tail; struct rip_md5_tail *tail;
struct MD5Context ctxt; struct MD5Context ctxt;
static int sequence = 0; static uint32_t sequence = 0;
if (num > PACKET_MD5_MAX) if (num > PACKET_MD5_MAX)
bug( "We can not add MD5 authentication to this long packet" ); bug( "We can not add MD5 authentication to this long packet" );
block->keyid = passwd->id; block->keyid = passwd->id;
block->authlen = 20; block->authlen = sizeof(struct rip_block_auth);
block->seq = sequence++; block->seq = sequence++;
block->zero0 = 0; block->zero0 = 0;
block->zero1 = 0; block->zero1 = 0;
block->packetlen = PACKETLEN(num) + block->authlen; block->packetlen = htons(PACKETLEN(num));
tail = (struct rip_md5_tail *) ((char *) packet + PACKETLEN(num) );
tail = (struct rip_md5_tail *) ((char *) packet + (block->packetlen - sizeof(struct rip_block_auth)));
tail->mustbeFFFF = 0xffff; tail->mustbeFFFF = 0xffff;
tail->mustbe0001 = 0x0001; tail->mustbe0001 = 0x0100;
password_strncpy( (char *) (&tail->md5), passwd->password, 16 );
memset(tail->md5,0,16);
password_strncpy( tail->md5, passwd->password, 16 );
MD5Init(&ctxt); MD5Init(&ctxt);
MD5Update(&ctxt, (char *) packet, block->packetlen ); MD5Update(&ctxt, (char *) packet, PACKETLEN(num) + sizeof(struct rip_md5_tail));
MD5Final((char *) (&tail->md5), &ctxt); MD5Final(tail->md5, &ctxt);
return PACKETLEN(num) + block->authlen; return PACKETLEN(num) + block->authlen;
} }
default: default: