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Bugfixes: select right password for password authentication, do not

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try to process authentication blocks as datablocks, make it possible
to add data at end of packet. Password authentication should actually work.
This commit is contained in:
Pavel Machek 1999-11-25 14:54:08 +00:00
parent 4aa885a53c
commit d3702d57fd
4 changed files with 53 additions and 37 deletions
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2
bird.conf
View file

@ -33,7 +33,7 @@ protocol rip MyRIP_test {
passwords { password "ahoj" from 0 to 10; passwords { password "ahoj" from 0 to 10;
password "nazdar" from 10; password "nazdar" from 10;
} }
authentication md5; authentication plaintext;
} }
protocol device { protocol device {

47
proto/rip/auth.c
View file

@ -4,6 +4,7 @@
* Copyright (c) 1999 Pavel Machek <pavel@ucw.cz> * Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
* *
* 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 #define LOCAL_DEBUG
@ -34,15 +35,19 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
{ {
DBG( "Incoming authentication: " ); DBG( "Incoming authentication: " );
switch (block->authtype) { /* Authentication type */ switch (block->authtype) { /* Authentication type */
case AT_PLAINTEXT: case AT_PLAINTEXT:
DBG( "Plaintext passwd" ); {
if (!P_CF->passwords) { struct password_item *passwd = get_best_password( P_CF->passwords, 0 );
log( L_AUTH "no passwords set and password authentication came\n" ); DBG( "Plaintext passwd" );
return 1; if (!passwd) {
} log( L_AUTH "no passwords set and password authentication came\n" );
if (strncmp( (char *) (&block->packetlen), P_CF->passwords->password, 16)) { return 1;
log( L_AUTH "Passwd authentication failed!\n" ); }
return 1; if (strncmp( (char *) (&block->packetlen), passwd->password, 16)) {
log( L_AUTH "Passwd authentication failed!\n" );
DBG( "Expected %s, got %s\n", passwd->password, &block->packetlen );
return 1;
}
} }
return 0; return 0;
case AT_MD5: case AT_MD5:
@ -51,12 +56,16 @@ 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 (block->packetlen != PACKETLEN(num)) { if (block->packetlen != PACKETLEN(num) + 20) {
log( L_ERR "packetlen in md5 does not match computed value\n" ); log( L_ERR "packetlen in md5 does not match computed value\n" );
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 + (block->packetlen - sizeof(struct rip_block_auth)));
if ((tail->mustbeFFFF != 0xffff) || (tail->mustbe0001 != 0x0001)) {
log( L_ERR "md5 tail signature is not there\n" );
return 1;
}
head = P_CF->passwords; head = P_CF->passwords;
while (head) { while (head) {
@ -91,15 +100,19 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
return 0; return 0;
} }
void int
rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num ) rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num )
{ {
struct password_item *passwd = get_best_password( P_CF->passwords, 0 ); struct password_item *passwd = get_best_password( P_CF->passwords, 0 );
if (!P_CF->authtype)
return PACKETLEN(num);
DBG( "Outgoing authentication: " ); DBG( "Outgoing authentication: " );
if (!passwd) { if (!passwd) {
log( L_ERR "no suitable password found for authentication\n" ); log( L_ERR "no suitable password found for authentication\n" );
return; return PACKETLEN(num);
} }
block->authtype = P_CF->authtype; block->authtype = P_CF->authtype;
@ -107,7 +120,7 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
switch (P_CF->authtype) { switch (P_CF->authtype) {
case AT_PLAINTEXT: case AT_PLAINTEXT:
password_strncpy( (char *) (&block->packetlen), passwd->password, 16); password_strncpy( (char *) (&block->packetlen), passwd->password, 16);
return; return PACKETLEN(num);
case AT_MD5: case AT_MD5:
{ {
struct rip_md5_tail *tail; struct rip_md5_tail *tail;
@ -121,8 +134,8 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
block->authlen = 20; block->authlen = 20;
block->seq = sequence++; block->seq = sequence++;
block->zero0 = 0; block->zero0 = 0;
block->zero1 = 1; block->zero1 = 0;
block->packetlen = PACKETLEN(num); block->packetlen = PACKETLEN(num) + block->authlen;
tail = (struct rip_md5_tail *) ((char *) packet + (block->packetlen - sizeof(struct rip_block_auth))); tail = (struct rip_md5_tail *) ((char *) packet + (block->packetlen - sizeof(struct rip_block_auth)));
tail->mustbeFFFF = 0xffff; tail->mustbeFFFF = 0xffff;
@ -132,7 +145,9 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
MD5Init(&ctxt); MD5Init(&ctxt);
MD5Update(&ctxt, (char *) packet, block->packetlen ); MD5Update(&ctxt, (char *) packet, block->packetlen );
MD5Final((char *) (&tail->md5), &ctxt); MD5Final((char *) (&tail->md5), &ctxt);
return; return block->packetlen;
} }
default:
bug( "Uknown authtype in outgoing authentication?\n" );
} }
} }

31
proto/rip/rip.c
View file

@ -114,7 +114,7 @@ rip_tx( sock *s )
struct rip_connection *c = rif->busy; struct rip_connection *c = rif->busy;
struct proto *p = c->proto; struct proto *p = c->proto;
struct rip_packet *packet = (void *) s->tbuf; struct rip_packet *packet = (void *) s->tbuf;
int i; int i, packetlen;
DBG( "Sending to %I\n", s->daddr ); DBG( "Sending to %I\n", s->daddr );
do { do {
@ -151,17 +151,17 @@ rip_tx( sock *s )
break_loop: break_loop:
if (P_CF->authtype) packetlen = rip_outgoing_authentication(p, (void *) &packet->block[0], packet, i);
rip_outgoing_authentication(p, (void *) &packet->block[0], packet, i);
DBG( ", sending %d blocks, ", i ); DBG( ", sending %d blocks, ", i );
if (!i) #if 0 /* FIXME: enable this for production! */
if (i == !!P_CF->authtype)
continue; continue;
#endif
if (ipa_nonzero(c->daddr)) if (ipa_nonzero(c->daddr))
i = sk_send_to( s, sizeof( struct rip_packet_heading ) + i*sizeof( struct rip_block ), c->daddr, c->dport ); i = sk_send_to( s, packetlen, c->daddr, c->dport );
else else
i = sk_send( s, sizeof( struct rip_packet_heading ) + i*sizeof( struct rip_block ) ); i = sk_send( s, packetlen );
DBG( "it wants more\n" ); DBG( "it wants more\n" );
@ -294,13 +294,12 @@ process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme )
ip_addr network = block->network; ip_addr network = block->network;
CHK_MAGIC; CHK_MAGIC;
debug( "block: %I tells me: %I/??? available, metric %d... ", whotoldme, network, metric );
if ((!metric) || (metric > P_CF->infinity)) { if ((!metric) || (metric > P_CF->infinity)) {
log( L_WARN "Got metric %d from %I", metric, whotoldme ); log( L_WARN "Got metric %d from %I", metric, whotoldme );
return; return;
} }
debug( "block: %I tells me: %I/??? available, metric %d... ", whotoldme, network, metric );
advertise_entry( p, block, whotoldme ); advertise_entry( p, block, whotoldme );
} }
@ -351,12 +350,14 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
for (i=0; i<num; i++) { for (i=0; i<num; i++) {
struct rip_block *block = &packet->block[i]; struct rip_block *block = &packet->block[i];
if (block->family == 0xffff) if (block->family == 0xffff) {
if (!i) { if (i)
if (rip_incoming_authentication(p, (void *) block, packet, num)) BAD( "Authentication header is not the first" );
BAD( "Authentication failed" ); if (rip_incoming_authentication(p, (void *) block, packet, num))
authenticated = 1; BAD( "Authentication failed" );
} authenticated = 1;
continue;
}
if ((!authenticated) && (P_CF->authtype != AT_NONE)) if ((!authenticated) && (P_CF->authtype != AT_NONE))
BAD( "Packet is not authenticated and it should be" ); BAD( "Packet is not authenticated and it should be" );
ipa_ntoh( block->network ); ipa_ntoh( block->network );

10
proto/rip/rip.h
View file

@ -42,7 +42,7 @@ struct rip_packet_heading {
}; };
#ifndef IPV6 #ifndef IPV6
struct rip_block { struct rip_block { /* 20 bytes */
u16 family; /* 0xffff on first message means this is authentication */ u16 family; /* 0xffff on first message means this is authentication */
u16 tag; u16 tag;
ip_addr network; ip_addr network;
@ -51,7 +51,7 @@ struct rip_block {
u32 metric; u32 metric;
}; };
#else #else
struct rip_block { struct rip_block { /* IPv6 version! */
ip_addr network; ip_addr network;
u16 tag; u16 tag;
u8 pxlen; u8 pxlen;
@ -59,7 +59,7 @@ struct rip_block {
}; };
#endif #endif
struct rip_block_auth { struct rip_block_auth { /* 20 bytes */
u16 mustbeFFFF; u16 mustbeFFFF;
u16 authtype; u16 authtype;
u16 packetlen; u16 packetlen;
@ -70,7 +70,7 @@ struct rip_block_auth {
u32 zero1; u32 zero1;
}; };
struct rip_md5_tail { struct rip_md5_tail { /* 20 bytes */
u16 mustbeFFFF; u16 mustbeFFFF;
u16 mustbe0001; u16 mustbe0001;
char md5[16]; char md5[16];
@ -158,4 +158,4 @@ void rip_init_config(struct rip_proto_config *c);
/* Authentication functions */ /* Authentication functions */
int rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num ); int rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num );
void rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num ); int rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num );