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Password management redesigned (untested).

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This commit is contained in:
Ondrej Filip 2004-06-26 20:11:14 +00:00
parent 98ac61766d
commit 5236fb03af
7 changed files with 122 additions and 129 deletions
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84
nest/config.Y
View File

@ -11,18 +11,21 @@ CF_HDR
#include "nest/rt-dev.h"
#include "nest/password.h"
#include "nest/cmds.h"
#include "lib/lists.h"
CF_DEFINES
static struct proto_config *this_proto;
static struct iface_patt *this_ipatt;
static list *this_p_list;
static struct password_item *this_p_item;
CF_DECLS
CF_KEYWORDS(ROUTER, ID, PROTOCOL, PREFERENCE, DISABLED, DEBUG, ALL, OFF, DIRECT)
CF_KEYWORDS(INTERFACE, IMPORT, EXPORT, FILTER, NONE, TABLE, STATES, ROUTES, FILTERS)
CF_KEYWORDS(PASSWORD, FROM, PASSIVE, TO, ID, EVENTS, PACKETS, PROTOCOLS, INTERFACES)
CF_KEYWORDS(PRIMARY, STATS, COUNT, FOR, COMMANDS, PREIMPORT)
CF_KEYWORDS(PRIMARY, STATS, COUNT, FOR, COMMANDS, PREIMPORT, GENERATE)
CF_ENUM(T_ENUM_RTS, RTS_, DUMMY, STATIC, INHERIT, DEVICE, STATIC_DEVICE, REDIRECT,
RIP, OSPF, OSPF_IA, OSPF_EXT1, OSPF_EXT2, BGP, PIPE)
@ -33,7 +36,7 @@ CF_ENUM(T_ENUM_RTD, RTD_, ROUTER, DEVICE, BLACKHOLE, UNREACHABLE, PROHIBIT)
%type <i32> idval
%type <f> imexport
%type <r> rtable
%type <p> password_list password_begin
%type <p> password_list password_begin password_begin_list
%type <s> optsym
%type <ra> r_args
%type <i> echo_mask echo_size debug_mask debug_list debug_flag import_or_proto
@ -193,36 +196,71 @@ debug_flag:
/* Password lists */
password_begin:
PASSWORD TEXT {
last_password_item = cfg_alloc(sizeof (struct password_item));
last_password_item->password = $2;
last_password_item->from = 0;
last_password_item->to = TIME_INFINITY;
last_password_item->id = 0;
last_password_item->next = NULL;
$$=last_password_item;
}
;
password_items:
/* empty */
| password_item ';' password_items
;
password_item:
password_item_begin '{' password_item_params '}'
| password_item_begin
;
password_item_begin:
PASSWORD TEXT {
static int id = 0;
this_p_item = cfg_alloc(sizeof (struct password_item));
this_p_item->password = $2;
this_p_item->genfrom = 0;
this_p_item->gento = TIME_INFINITY;
this_p_item->accfrom = 0;
this_p_item->accto = TIME_INFINITY;
this_p_item->id = id++;
add_tail(this_p_list, &this_p_item->n);
}
;
password_item_params:
/* empty */ { }
| FROM datetime password_items { last_password_item->from = $2; }
| TO datetime password_items { last_password_item->to = $2; }
| PASSIVE datetime password_items { last_password_item->passive = $2; }
| ID expr password_items { last_password_item->id = $2; }
| GENERATE FROM datetime ';' password_item_params { this_p_item->genfrom = $3; }
| GENERATE TO datetime ';' password_item_params { this_p_item->gento = $3; }
| ACCEPT FROM datetime ';' password_item_params { this_p_item->accfrom = $3; }
| ACCEPT TO datetime ';' password_item_params { this_p_item->accto = $3; }
| ID expr ';' password_item_params { this_p_item->id = $2; }
;
password_list:
/* empty */ { $$ = NULL; }
| password_begin password_items ';' password_list {
$1->next = $4;
password_begin_list '{' password_items '}' {
$$ = $1;
}
;
| password_begin
;
password_begin_list:
PASSWORDS {
this_p_list = cfg_alloc(sizeof(list));
init_list(this_p_list);
$$ = this_p_list;
}
;
password_begin:
PASSWORD TEXT {
this_p_list = cfg_alloc(sizeof(list));
init_list(this_p_list);
this_p_item = cfg_alloc(sizeof (struct password_item));
this_p_item->password = $2;
this_p_item->genfrom = 0;
this_p_item->gento = TIME_INFINITY;
this_p_item->accfrom = 0;
this_p_item->accto = TIME_INFINITY;
this_p_item->id = 0;
add_tail(this_p_list, &this_p_item->n);
$$ = this_p_list;
}
;
/* Core commands */
CF_CLI_HELP(SHOW, ..., [[Show status information]])
CF_CLI(SHOW STATUS,,, [[Show router status]])

63
nest/password.c
View File

@ -1,7 +1,8 @@
/*
* BIRD -- Password handling
*
* Copyright 1999 Pavel Machek <pavel@ucw.cz>
* (c) 1999 Pavel Machek <pavel@ucw.cz>
* (c) 2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
@ -12,62 +13,22 @@
struct password_item *last_password_item = NULL;
static int
password_goodness(struct password_item *i)
{
if (i->from > now)
return 0;
if (i->to < now)
return 0;
if (i->passive < now)
return 1;
return 2;
}
struct password_item *
get_best_password(struct password_item *head, int flags UNUSED)
password_find(list *l)
{
int good = -1;
struct password_item *best = NULL;
struct password_item *pi;
while (head) {
int cur = password_goodness(head);
if (cur > good) {
good = cur;
best = head;
}
head=head->next;
WALK_LIST(pi, *l)
{
if ((pi->genfrom > now) && (pi->gento < now))
return pi;
}
return best;
return NULL;
}
void
password_strncpy(char *to, char *from, int len)
void password_cpy(char *dst, char *src, int size)
{
int i;
for (i=0; i<len; i++) {
*to++ = *from;
if (*from)
from++;
}
bzero(dst, size);
memcpy(dst, src, strlen(src) < size ? strlen(src) : size);
}
int
password_same(struct password_item *old, struct password_item *new)
{
for(;;)
{
if (old == new)
return 1;
if (!old || !new)
return 0;
if (old->from != new->from ||
old->to != new->to ||
old->passive != new->passive ||
old->id != new->id ||
strcmp(old->password, new->password))
return 0;
old = old->next;
new = new->next;
}
}

15
nest/password.h
View File

@ -1,7 +1,8 @@
/*
* BIRD -- Password handling
*
* Copyright 1999 Pavel Machek <pavel@ucw.cz>
* (c) 1999 Pavel Machek <pavel@ucw.cz>
* (c) 2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
@ -10,18 +11,18 @@
#define PASSWORD_H
#include "lib/timer.h"
#define MD5_AUTH_SIZE 16
struct password_item {
struct password_item *next;
node n;
char *password;
int id;
bird_clock_t from, passive, to;
bird_clock_t accfrom, accto, genfrom, gento;
};
extern struct password_item *last_password_item;
struct password_item *get_best_password(struct password_item *head, int flags);
extern int password_same(struct password_item *, struct password_item *);
extern void password_strncpy(char *to, char *from, int len);
struct password_item *password_find(list *);
void password_cpy(char *dst, char *src, int size);
#endif

84
proto/rip/auth.c
View File

@ -2,6 +2,7 @@
* Rest in pieces - RIP protocol
*
* Copyright (c) 1999 Pavel Machek <pavel@ucw.cz>
* Copyright (c) 2004 Ondrej Filip <feela@network.cz>
*
* Bug fixes by Eric Leblond <eleblond@init-sys.com>, April 2003
*
@ -38,7 +39,7 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
switch (ntohs(block->authtype)) { /* Authentication type */
case AT_PLAINTEXT:
{
struct password_item *passwd = get_best_password( P_CF->passwords, 0 );
struct password_item *passwd = password_find(P_CF->passwords);
DBG( "Plaintext passwd" );
if (!passwd) {
log( L_AUTH "No passwords set and password authentication came" );
@ -50,12 +51,18 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
return 1;
}
}
return 0;
break;
case AT_MD5:
DBG( "md5 password" );
{
struct password_item *head;
struct password_item *pass = NULL, *ptmp;
struct rip_md5_tail *tail;
struct MD5Context ctxt;
char md5sum_packet[16];
char md5sum_computed[16];
struct neighbor *neigh = neigh_find(p, &whotoldme, 0);
list *l = P_CF->passwords;
if (ntohs(block->packetlen) != PACKETLEN(num) - sizeof(struct rip_md5_tail) ) {
log( L_ERR "Packet length in MD5 does not match computed value" );
return 1;
@ -67,44 +74,34 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
return 1;
}
head = P_CF->passwords;
while (head) {
DBG( "time, " );
if ((head->from > now) || (head->to < now))
goto skip;
if (block->seq) {
struct neighbor *neigh = neigh_find(p, &whotoldme, 0);
if (!neigh) {
log( L_AUTH "Non-neighbour MD5 checksummed packet?" );
} else {
if (neigh->aux > block->seq) {
log( L_AUTH "MD5 protected packet with lower numbers" );
return 0;
}
neigh->aux = block->seq;
}
}
DBG( "check, " );
if (head->id == block->keyid) {
struct MD5Context ctxt;
char md5sum_packet[16];
char md5sum_computed[16];
memset(md5sum_packet,0,16);
memcpy(md5sum_packet, tail->md5, 16);
password_strncpy(tail->md5, head->password, 16);
MD5Init(&ctxt);
MD5Update(&ctxt, (char *) packet, ntohs(block->packetlen) + sizeof(struct rip_block_auth) );
MD5Final(md5sum_computed, &ctxt);
if (memcmp(md5sum_packet, md5sum_computed, 16))
return 1;
return 0;
}
skip:
head = head->next;
WALK_LIST(ptmp, *l)
{
if (block->keyid != pass->id) continue;
if ((pass->genfrom > now) || (pass->gento < now)) continue;
pass = ptmp;
break;
}
return 1;
if(!pass) return 1;
if (!neigh) {
log( L_AUTH "Non-neighbour MD5 checksummed packet?" );
} else {
if (neigh->aux > block->seq) {
log( L_AUTH "MD5 protected packet with lower numbers" );
return 1;
}
neigh->aux = block->seq;
}
memcpy(md5sum_packet, tail->md5, 16);
password_cpy(tail->md5, pass->password, 16);
MD5Init(&ctxt);
MD5Update(&ctxt, (char *) packet, ntohs(block->packetlen) + sizeof(struct rip_block_auth) );
MD5Final(md5sum_computed, &ctxt);
if (memcmp(md5sum_packet, md5sum_computed, 16))
return 1;
}
}
@ -118,7 +115,7 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
int
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 = password_find( P_CF->passwords);
if (!P_CF->authtype)
return PACKETLEN(num);
@ -134,7 +131,7 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
block->mustbeFFFF = 0xffff;
switch (P_CF->authtype) {
case AT_PLAINTEXT:
password_strncpy( (char *) (&block->packetlen), passwd->password, 16);
password_cpy( (char *) (&block->packetlen), passwd->password, 16);
return PACKETLEN(num);
case AT_MD5:
{
@ -159,8 +156,7 @@ rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, stru
tail->mustbeFFFF = 0xffff;
tail->mustbe0001 = 0x0100;
memset(tail->md5,0,16);
password_strncpy( tail->md5, passwd->password, 16 );
password_cpy(tail->md5, passwd->password, 16);
MD5Init(&ctxt);
MD5Update(&ctxt, (char *) packet, PACKETLEN(num) + sizeof(struct rip_md5_tail));
MD5Final(tail->md5, &ctxt);

2
proto/rip/config.Y
View File

@ -51,7 +51,7 @@ rip_cfg:
| rip_cfg GARBAGE TIME expr ';' { RIP_CFG->garbage_time = $4; }
| rip_cfg TIMEOUT TIME expr ';' { RIP_CFG->timeout_time = $4; }
| rip_cfg AUTHENTICATION rip_auth ';' {RIP_CFG->authtype = $3; }
| rip_cfg PASSWORDS '{' password_list '}' {RIP_CFG->passwords = $4; }
| rip_cfg password_list ';' {RIP_CFG->passwords = $2; }
| rip_cfg HONOR ALWAYS ';' { RIP_CFG->honor = HO_ALWAYS; }
| rip_cfg HONOR NEIGHBOR ';' { RIP_CFG->honor = HO_NEIGHBOR; }
| rip_cfg HONOR NEVER ';' { RIP_CFG->honor = HO_NEVER; }

3
proto/rip/rip.c
View File

@ -981,9 +981,6 @@ rip_reconfigure(struct proto *p, struct proto_config *c)
if (!iface_patts_equal(&P_CF->iface_list, &new->iface_list, (void *) rip_pat_compare))
return 0;
if (!password_same(P_CF->passwords,
new->passwords))
return 0;
return !memcmp(((byte *) P_CF) + generic,
((byte *) new) + generic,
sizeof(struct rip_proto_config) - generic);

2
proto/rip/rip.h
View File

@ -121,7 +121,7 @@ struct rip_patt {
struct rip_proto_config {
struct proto_config c;
list iface_list; /* Patterns configured -- keep it first; see rip_reconfigure why */
struct password_item *passwords; /* Passwords, keep second */
list *passwords; /* Passwords, keep second */
int infinity; /* User configurable data; must be comparable with memcmp */
int port;