version 1.72, 2001/08/03 10:31:30 |
version 1.72.2.1, 2002/03/07 17:37:47 |
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/* $OpenBSD$ */ |
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/* |
/* |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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*/ |
*/ |
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#include "includes.h" |
#include "includes.h" |
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#include <sys/queue.h> |
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
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#include <openssl/evp.h> |
#include <openssl/evp.h> |
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#include "buffer.h" |
#include "buffer.h" |
#include "bufaux.h" |
#include "bufaux.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
#include "packet.h" |
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#include "getput.h" |
#include "getput.h" |
#include "mpaux.h" |
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#include "key.h" |
#include "key.h" |
#include "authfd.h" |
#include "authfd.h" |
#include "cipher.h" |
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#include "kex.h" |
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#include "compat.h" |
#include "compat.h" |
#include "log.h" |
#include "log.h" |
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#include "scard.h" |
#include "scard.h" |
#endif |
#endif |
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typedef enum { |
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AUTH_UNUSED, |
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AUTH_SOCKET, |
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AUTH_CONNECTION |
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} sock_type; |
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typedef struct { |
typedef struct { |
int fd; |
int fd; |
enum { |
sock_type type; |
AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION |
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} type; |
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Buffer input; |
Buffer input; |
Buffer output; |
Buffer output; |
} SocketEntry; |
} SocketEntry; |
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u_int sockets_alloc = 0; |
u_int sockets_alloc = 0; |
SocketEntry *sockets = NULL; |
SocketEntry *sockets = NULL; |
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typedef struct { |
typedef struct identity { |
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TAILQ_ENTRY(identity) next; |
Key *key; |
Key *key; |
char *comment; |
char *comment; |
} Identity; |
} Identity; |
|
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typedef struct { |
typedef struct { |
int nentries; |
int nentries; |
Identity *identities; |
TAILQ_HEAD(idqueue, identity) idlist; |
} Idtab; |
} Idtab; |
|
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/* private key table, one per protocol version */ |
/* private key table, one per protocol version */ |
|
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idtab_init(void) |
idtab_init(void) |
{ |
{ |
int i; |
int i; |
for (i = 0; i <=2; i++){ |
for (i = 0; i <=2; i++) { |
idtable[i].identities = NULL; |
TAILQ_INIT(&idtable[i].idlist); |
idtable[i].nentries = 0; |
idtable[i].nentries = 0; |
} |
} |
} |
} |
|
|
} |
} |
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/* return matching private key for given public key */ |
/* return matching private key for given public key */ |
static Key * |
static Identity * |
lookup_private_key(Key *key, int *idx, int version) |
lookup_identity(Key *key, int version) |
{ |
{ |
int i; |
Identity *id; |
|
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Idtab *tab = idtab_lookup(version); |
Idtab *tab = idtab_lookup(version); |
for (i = 0; i < tab->nentries; i++) { |
TAILQ_FOREACH(id, &tab->idlist, next) { |
if (key_equal(key, tab->identities[i].key)) { |
if (key_equal(key, id->key)) |
if (idx != NULL) |
return (id); |
*idx = i; |
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return tab->identities[i].key; |
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} |
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} |
} |
return NULL; |
return (NULL); |
} |
} |
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static void |
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free_identity(Identity *id) |
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{ |
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key_free(id->key); |
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xfree(id->comment); |
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xfree(id); |
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} |
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/* send list of supported public keys to 'client' */ |
/* send list of supported public keys to 'client' */ |
static void |
static void |
process_request_identities(SocketEntry *e, int version) |
process_request_identities(SocketEntry *e, int version) |
{ |
{ |
Idtab *tab = idtab_lookup(version); |
Idtab *tab = idtab_lookup(version); |
Buffer msg; |
Buffer msg; |
int i; |
Identity *id; |
|
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buffer_init(&msg); |
buffer_init(&msg); |
buffer_put_char(&msg, (version == 1) ? |
buffer_put_char(&msg, (version == 1) ? |
SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); |
SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); |
buffer_put_int(&msg, tab->nentries); |
buffer_put_int(&msg, tab->nentries); |
for (i = 0; i < tab->nentries; i++) { |
TAILQ_FOREACH(id, &tab->idlist, next) { |
Identity *id = &tab->identities[i]; |
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if (id->key->type == KEY_RSA1) { |
if (id->key->type == KEY_RSA1) { |
buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
buffer_put_bignum(&msg, id->key->rsa->e); |
buffer_put_bignum(&msg, id->key->rsa->e); |
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static void |
static void |
process_authentication_challenge1(SocketEntry *e) |
process_authentication_challenge1(SocketEntry *e) |
{ |
{ |
Key *key, *private; |
Identity *id; |
|
Key *key; |
BIGNUM *challenge; |
BIGNUM *challenge; |
int i, len; |
int i, len; |
Buffer msg; |
Buffer msg; |
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|
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buffer_init(&msg); |
buffer_init(&msg); |
key = key_new(KEY_RSA1); |
key = key_new(KEY_RSA1); |
challenge = BN_new(); |
if ((challenge = BN_new()) == NULL) |
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fatal("process_authentication_challenge1: BN_new failed"); |
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buffer_get_int(&e->input); /* ignored */ |
buffer_get_int(&e->input); /* ignored */ |
buffer_get_bignum(&e->input, key->rsa->e); |
buffer_get_bignum(&e->input, key->rsa->e); |
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/* Only protocol 1.1 is supported */ |
/* Only protocol 1.1 is supported */ |
if (buffer_len(&e->input) == 0) |
if (buffer_len(&e->input) == 0) |
goto failure; |
goto failure; |
buffer_get(&e->input, (char *) session_id, 16); |
buffer_get(&e->input, session_id, 16); |
response_type = buffer_get_int(&e->input); |
response_type = buffer_get_int(&e->input); |
if (response_type != 1) |
if (response_type != 1) |
goto failure; |
goto failure; |
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private = lookup_private_key(key, NULL, 1); |
id = lookup_identity(key, 1); |
if (private != NULL) { |
if (id != NULL) { |
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Key *private = id->key; |
/* Decrypt the challenge using the private key. */ |
/* Decrypt the challenge using the private key. */ |
if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0) |
goto failure; |
goto failure; |
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process_sign_request2(SocketEntry *e) |
process_sign_request2(SocketEntry *e) |
{ |
{ |
extern int datafellows; |
extern int datafellows; |
Key *key, *private; |
Key *key; |
u_char *blob, *data, *signature = NULL; |
u_char *blob, *data, *signature = NULL; |
u_int blen, dlen, slen = 0; |
u_int blen, dlen, slen = 0; |
int flags; |
int flags; |
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key = key_from_blob(blob, blen); |
key = key_from_blob(blob, blen); |
if (key != NULL) { |
if (key != NULL) { |
private = lookup_private_key(key, NULL, 2); |
Identity *id = lookup_identity(key, 2); |
if (private != NULL) |
if (id != NULL) |
ok = key_sign(private, &signature, &slen, data, dlen); |
ok = key_sign(id->key, &signature, &slen, data, dlen); |
} |
} |
key_free(key); |
key_free(key); |
buffer_init(&msg); |
buffer_init(&msg); |
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static void |
static void |
process_remove_identity(SocketEntry *e, int version) |
process_remove_identity(SocketEntry *e, int version) |
{ |
{ |
Key *key = NULL, *private; |
Key *key = NULL; |
u_char *blob; |
u_char *blob; |
u_int blen; |
u_int blen; |
u_int bits; |
u_int bits; |
int success = 0; |
int success = 0; |
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switch(version){ |
switch (version) { |
case 1: |
case 1: |
key = key_new(KEY_RSA1); |
key = key_new(KEY_RSA1); |
bits = buffer_get_int(&e->input); |
bits = buffer_get_int(&e->input); |
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break; |
break; |
} |
} |
if (key != NULL) { |
if (key != NULL) { |
int idx; |
Identity *id = lookup_identity(key, version); |
private = lookup_private_key(key, &idx, version); |
if (id != NULL) { |
if (private != NULL) { |
|
/* |
/* |
* We have this key. Free the old key. Since we |
* We have this key. Free the old key. Since we |
* don\'t want to leave empty slots in the middle of |
* don\'t want to leave empty slots in the middle of |
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* of the array. |
* of the array. |
*/ |
*/ |
Idtab *tab = idtab_lookup(version); |
Idtab *tab = idtab_lookup(version); |
key_free(tab->identities[idx].key); |
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xfree(tab->identities[idx].comment); |
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if (tab->nentries < 1) |
if (tab->nentries < 1) |
fatal("process_remove_identity: " |
fatal("process_remove_identity: " |
"internal error: tab->nentries %d", |
"internal error: tab->nentries %d", |
tab->nentries); |
tab->nentries); |
if (idx != tab->nentries - 1) { |
TAILQ_REMOVE(&tab->idlist, id, next); |
int i; |
free_identity(id); |
for (i = idx; i < tab->nentries - 1; i++) |
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tab->identities[i] = tab->identities[i+1]; |
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} |
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tab->identities[tab->nentries - 1].key = NULL; |
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tab->identities[tab->nentries - 1].comment = NULL; |
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tab->nentries--; |
tab->nentries--; |
success = 1; |
success = 1; |
} |
} |
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static void |
static void |
process_remove_all_identities(SocketEntry *e, int version) |
process_remove_all_identities(SocketEntry *e, int version) |
{ |
{ |
u_int i; |
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Idtab *tab = idtab_lookup(version); |
Idtab *tab = idtab_lookup(version); |
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Identity *id; |
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/* Loop over all identities and clear the keys. */ |
/* Loop over all identities and clear the keys. */ |
for (i = 0; i < tab->nentries; i++) { |
for (id = TAILQ_FIRST(&tab->idlist); id; |
key_free(tab->identities[i].key); |
id = TAILQ_FIRST(&tab->idlist)) { |
xfree(tab->identities[i].comment); |
TAILQ_REMOVE(&tab->idlist, id, next); |
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free_identity(id); |
} |
} |
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/* Mark that there are no identities. */ |
/* Mark that there are no identities. */ |
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type_name = buffer_get_string(&e->input, NULL); |
type_name = buffer_get_string(&e->input, NULL); |
type = key_type_from_name(type_name); |
type = key_type_from_name(type_name); |
xfree(type_name); |
xfree(type_name); |
switch(type) { |
switch (type) { |
case KEY_DSA: |
case KEY_DSA: |
k = key_new_private(type); |
k = key_new_private(type); |
buffer_get_bignum2(&e->input, k->dsa->p); |
buffer_get_bignum2(&e->input, k->dsa->p); |
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goto send; |
goto send; |
} |
} |
success = 1; |
success = 1; |
if (lookup_private_key(k, NULL, version) == NULL) { |
if (lookup_identity(k, version) == NULL) { |
if (tab->nentries == 0) |
Identity *id = xmalloc(sizeof(Identity)); |
tab->identities = xmalloc(sizeof(Identity)); |
id->key = k; |
else |
id->comment = comment; |
tab->identities = xrealloc(tab->identities, |
TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
(tab->nentries + 1) * sizeof(Identity)); |
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tab->identities[tab->nentries].key = k; |
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tab->identities[tab->nentries].comment = comment; |
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/* Increment the number of identities. */ |
/* Increment the number of identities. */ |
tab->nentries++; |
tab->nentries++; |
} else { |
} else { |
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Key *n = NULL, *k = NULL; |
Key *n = NULL, *k = NULL; |
char *sc_reader_id = NULL; |
char *sc_reader_id = NULL; |
int success = 0; |
int success = 0; |
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sc_reader_id = buffer_get_string(&e->input, NULL); |
sc_reader_id = buffer_get_string(&e->input, NULL); |
k = sc_get_key(sc_reader_id); |
k = sc_get_key(sc_reader_id); |
xfree(sc_reader_id); |
xfree(sc_reader_id); |
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tab = idtab_lookup(1); |
tab = idtab_lookup(1); |
k->type = KEY_RSA1; |
k->type = KEY_RSA1; |
if (lookup_private_key(k, NULL, 1) == NULL) { |
if (lookup_identity(k, 1) == NULL) { |
if (tab->nentries == 0) |
Identity *id = xmalloc(sizeof(Identity)); |
tab->identities = xmalloc(sizeof(Identity)); |
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else |
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tab->identities = xrealloc(tab->identities, |
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(tab->nentries + 1) * sizeof(Identity)); |
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n = key_new(KEY_RSA1); |
n = key_new(KEY_RSA1); |
BN_copy(n->rsa->n, k->rsa->n); |
BN_copy(n->rsa->n, k->rsa->n); |
BN_copy(n->rsa->e, k->rsa->e); |
BN_copy(n->rsa->e, k->rsa->e); |
RSA_set_method(n->rsa, sc_get_engine()); |
RSA_set_method(n->rsa, sc_get_engine()); |
tab->identities[tab->nentries].key = n; |
id->key = n; |
tab->identities[tab->nentries].comment = |
id->comment = xstrdup("rsa1 smartcard"); |
xstrdup("rsa1 smartcard"); |
TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
tab->nentries++; |
tab->nentries++; |
} |
} |
k->type = KEY_RSA; |
k->type = KEY_RSA; |
tab = idtab_lookup(2); |
tab = idtab_lookup(2); |
if (lookup_private_key(k, NULL, 2) == NULL) { |
if (lookup_identity(k, 2) == NULL) { |
if (tab->nentries == 0) |
Identity *id = xmalloc(sizeof(Identity)); |
tab->identities = xmalloc(sizeof(Identity)); |
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else |
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tab->identities = xrealloc(tab->identities, |
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(tab->nentries + 1) * sizeof(Identity)); |
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n = key_new(KEY_RSA); |
n = key_new(KEY_RSA); |
BN_copy(n->rsa->n, k->rsa->n); |
BN_copy(n->rsa->n, k->rsa->n); |
BN_copy(n->rsa->e, k->rsa->e); |
BN_copy(n->rsa->e, k->rsa->e); |
RSA_set_method(n->rsa, sc_get_engine()); |
RSA_set_method(n->rsa, sc_get_engine()); |
tab->identities[tab->nentries].key = n; |
id->key = n; |
tab->identities[tab->nentries].comment = |
id->comment = xstrdup("rsa smartcard"); |
xstrdup("rsa smartcard"); |
TAILQ_INSERT_TAIL(&tab->idlist, id, next); |
tab->nentries++; |
tab->nentries++; |
} |
} |
key_free(k); |
key_free(k); |
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static void |
static void |
process_remove_smartcard_key(SocketEntry *e) |
process_remove_smartcard_key(SocketEntry *e) |
{ |
{ |
Key *k = NULL, *private; |
Key *k = NULL; |
int idx; |
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int success = 0; |
int success = 0; |
char *sc_reader_id = NULL; |
char *sc_reader_id = NULL; |
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if (k == NULL) { |
if (k == NULL) { |
error("sc_get_pubkey failed"); |
error("sc_get_pubkey failed"); |
} else { |
} else { |
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Identity *id; |
k->type = KEY_RSA1; |
k->type = KEY_RSA1; |
private = lookup_private_key(k, &idx, 1); |
id = lookup_identity(k, 1); |
if (private != NULL) { |
if (id != NULL) { |
Idtab *tab = idtab_lookup(1); |
Idtab *tab = idtab_lookup(1); |
key_free(tab->identities[idx].key); |
TAILQ_REMOVE(&tab->idlist, id, next); |
xfree(tab->identities[idx].comment); |
free_identity(id); |
if (idx != tab->nentries) |
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tab->identities[idx] = tab->identities[tab->nentries]; |
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tab->nentries--; |
tab->nentries--; |
success = 1; |
success = 1; |
} |
} |
k->type = KEY_RSA; |
k->type = KEY_RSA; |
private = lookup_private_key(k, &idx, 2); |
id = lookup_identity(k, 2); |
if (private != NULL) { |
if (id != NULL) { |
Idtab *tab = idtab_lookup(2); |
Idtab *tab = idtab_lookup(2); |
key_free(tab->identities[idx].key); |
TAILQ_REMOVE(&tab->idlist, id, next); |
xfree(tab->identities[idx].comment); |
free_identity(id); |
if (idx != tab->nentries) |
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tab->identities[idx] = tab->identities[tab->nentries]; |
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tab->nentries--; |
tab->nentries--; |
success = 1; |
success = 1; |
} |
} |
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u_char *cp; |
u_char *cp; |
if (buffer_len(&e->input) < 5) |
if (buffer_len(&e->input) < 5) |
return; /* Incomplete message. */ |
return; /* Incomplete message. */ |
cp = (u_char *) buffer_ptr(&e->input); |
cp = buffer_ptr(&e->input); |
msg_len = GET_32BIT(cp); |
msg_len = GET_32BIT(cp); |
if (msg_len > 256 * 1024) { |
if (msg_len > 256 * 1024) { |
shutdown(e->fd, SHUT_RDWR); |
shutdown(e->fd, SHUT_RDWR); |
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#ifdef SMARTCARD |
#ifdef SMARTCARD |
case SSH_AGENTC_ADD_SMARTCARD_KEY: |
case SSH_AGENTC_ADD_SMARTCARD_KEY: |
process_add_smartcard_key(e); |
process_add_smartcard_key(e); |
break; |
break; |
case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
case SSH_AGENTC_REMOVE_SMARTCARD_KEY: |
process_remove_smartcard_key(e); |
process_remove_smartcard_key(e); |
break; |
break; |
#endif /* SMARTCARD */ |
#endif /* SMARTCARD */ |
default: |
default: |
/* Unknown message. Respond with failure. */ |
/* Unknown message. Respond with failure. */ |
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} |
} |
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static void |
static void |
new_socket(int type, int fd) |
new_socket(sock_type type, int fd) |
{ |
{ |
u_int i, old_alloc; |
u_int i, old_alloc; |
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
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sock = accept(sockets[i].fd, |
sock = accept(sockets[i].fd, |
(struct sockaddr *) &sunaddr, &slen); |
(struct sockaddr *) &sunaddr, &slen); |
if (sock < 0) { |
if (sock < 0) { |
perror("accept from AUTH_SOCKET"); |
error("accept from AUTH_SOCKET: %s", |
|
strerror(errno)); |
break; |
break; |
} |
} |
new_socket(AUTH_CONNECTION, sock); |
new_socket(AUTH_CONNECTION, sock); |
|
|
} |
} |
|
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static void |
static void |
cleanup_socket(void) |
cleanup_socket(void *p) |
{ |
{ |
if (socket_name[0]) |
if (socket_name[0]) |
unlink(socket_name); |
unlink(socket_name); |
|
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static void |
static void |
cleanup_exit(int i) |
cleanup_exit(int i) |
{ |
{ |
cleanup_socket(); |
cleanup_socket(NULL); |
exit(i); |
exit(i); |
} |
} |
|
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static void |
static void |
cleanup_handler(int sig) |
cleanup_handler(int sig) |
{ |
{ |
cleanup_socket(); |
cleanup_socket(NULL); |
_exit(2); |
_exit(2); |
} |
} |
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|
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pid = fork(); |
pid = fork(); |
if (pid == -1) { |
if (pid == -1) { |
perror("fork"); |
perror("fork"); |
exit(1); |
cleanup_exit(1); |
} |
} |
if (pid != 0) { /* Parent - execute the given command. */ |
if (pid != 0) { /* Parent - execute the given command. */ |
close(sock); |
close(sock); |
|
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perror(av[0]); |
perror(av[0]); |
exit(1); |
exit(1); |
} |
} |
|
/* child */ |
|
log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0); |
|
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if (setsid() == -1) { |
if (setsid() == -1) { |
perror("setsid"); |
error("setsid: %s", strerror(errno)); |
cleanup_exit(1); |
cleanup_exit(1); |
} |
} |
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|
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/* deny core dumps, since memory contains unencrypted private keys */ |
/* deny core dumps, since memory contains unencrypted private keys */ |
rlim.rlim_cur = rlim.rlim_max = 0; |
rlim.rlim_cur = rlim.rlim_max = 0; |
if (setrlimit(RLIMIT_CORE, &rlim) < 0) { |
if (setrlimit(RLIMIT_CORE, &rlim) < 0) { |
perror("setrlimit rlimit_core failed"); |
error("setrlimit RLIMIT_CORE: %s", strerror(errno)); |
cleanup_exit(1); |
cleanup_exit(1); |
} |
} |
|
|
skip: |
skip: |
if (atexit(cleanup_socket) < 0) { |
fatal_add_cleanup(cleanup_socket, NULL); |
perror("atexit"); |
|
cleanup_exit(1); |
|
} |
|
new_socket(AUTH_SOCKET, sock); |
new_socket(AUTH_SOCKET, sock); |
if (ac > 0) { |
if (ac > 0) { |
signal(SIGALRM, check_parent_exists); |
signal(SIGALRM, check_parent_exists); |
|
|
if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) { |
if (errno == EINTR) |
if (errno == EINTR) |
continue; |
continue; |
exit(1); |
fatal("select: %s", strerror(errno)); |
} |
} |
after_select(readsetp, writesetp); |
after_select(readsetp, writesetp); |
} |
} |