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-rw-r--r--ssh-agent.c744
1 files changed, 276 insertions, 468 deletions
diff --git a/ssh-agent.c b/ssh-agent.c
index b987562b9aa1..0c6c3659217f 100644
--- a/ssh-agent.c
+++ b/ssh-agent.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh-agent.c,v 1.218 2017/03/15 03:52:30 deraadt Exp $ */
+/* $OpenBSD: ssh-agent.c,v 1.224 2017/07/24 04:34:28 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -60,6 +60,9 @@
#ifdef HAVE_PATHS_H
# include <paths.h>
#endif
+#ifdef HAVE_POLL_H
+# include <poll.h>
+#endif
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
@@ -73,7 +76,6 @@
#include "xmalloc.h"
#include "ssh.h"
-#include "rsa.h"
#include "sshbuf.h"
#include "sshkey.h"
#include "authfd.h"
@@ -92,6 +94,9 @@
# define DEFAULT_PKCS11_WHITELIST "/usr/lib*/*,/usr/local/lib*/*"
#endif
+/* Maximum accepted message length */
+#define AGENT_MAX_LEN (256*1024)
+
typedef enum {
AUTH_UNUSED,
AUTH_SOCKET,
@@ -118,13 +123,13 @@ typedef struct identity {
u_int confirm;
} Identity;
-typedef struct {
+struct idtable {
int nentries;
TAILQ_HEAD(idqueue, identity) idlist;
-} Idtab;
+};
-/* private key table, one per protocol version */
-Idtab idtable[3];
+/* private key table */
+struct idtable *idtab;
int max_fd = 0;
@@ -171,21 +176,9 @@ close_socket(SocketEntry *e)
static void
idtab_init(void)
{
- int i;
-
- for (i = 0; i <=2; i++) {
- TAILQ_INIT(&idtable[i].idlist);
- idtable[i].nentries = 0;
- }
-}
-
-/* return private key table for requested protocol version */
-static Idtab *
-idtab_lookup(int version)
-{
- if (version < 1 || version > 2)
- fatal("internal error, bad protocol version %d", version);
- return &idtable[version];
+ idtab = xcalloc(1, sizeof(*idtab));
+ TAILQ_INIT(&idtab->idlist);
+ idtab->nentries = 0;
}
static void
@@ -199,12 +192,11 @@ free_identity(Identity *id)
/* return matching private key for given public key */
static Identity *
-lookup_identity(struct sshkey *key, int version)
+lookup_identity(struct sshkey *key)
{
Identity *id;
- Idtab *tab = idtab_lookup(version);
- TAILQ_FOREACH(id, &tab->idlist, next) {
+ TAILQ_FOREACH(id, &idtab->idlist, next) {
if (sshkey_equal(key, id->key))
return (id);
}
@@ -241,135 +233,30 @@ send_status(SocketEntry *e, int success)
/* send list of supported public keys to 'client' */
static void
-process_request_identities(SocketEntry *e, int version)
+process_request_identities(SocketEntry *e)
{
- Idtab *tab = idtab_lookup(version);
Identity *id;
struct sshbuf *msg;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
- if ((r = sshbuf_put_u8(msg, (version == 1) ?
- SSH_AGENT_RSA_IDENTITIES_ANSWER :
- SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
- (r = sshbuf_put_u32(msg, tab->nentries)) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
- TAILQ_FOREACH(id, &tab->idlist, next) {
- if (id->key->type == KEY_RSA1) {
-#ifdef WITH_SSH1
- if ((r = sshbuf_put_u32(msg,
- BN_num_bits(id->key->rsa->n))) != 0 ||
- (r = sshbuf_put_bignum1(msg,
- id->key->rsa->e)) != 0 ||
- (r = sshbuf_put_bignum1(msg,
- id->key->rsa->n)) != 0)
- fatal("%s: buffer error: %s",
- __func__, ssh_err(r));
-#endif
- } else {
- u_char *blob;
- size_t blen;
-
- if ((r = sshkey_to_blob(id->key, &blob, &blen)) != 0) {
- error("%s: sshkey_to_blob: %s", __func__,
- ssh_err(r));
- continue;
- }
- if ((r = sshbuf_put_string(msg, blob, blen)) != 0)
- fatal("%s: buffer error: %s",
- __func__, ssh_err(r));
- free(blob);
- }
- if ((r = sshbuf_put_cstring(msg, id->comment)) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
- }
- if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
- sshbuf_free(msg);
-}
-
-#ifdef WITH_SSH1
-/* ssh1 only */
-static void
-process_authentication_challenge1(SocketEntry *e)
-{
- u_char buf[32], mdbuf[16], session_id[16];
- u_int response_type;
- BIGNUM *challenge;
- Identity *id;
- int r, len;
- struct sshbuf *msg;
- struct ssh_digest_ctx *md;
- struct sshkey *key;
-
- if ((msg = sshbuf_new()) == NULL)
- fatal("%s: sshbuf_new failed", __func__);
- if ((key = sshkey_new(KEY_RSA1)) == NULL)
- fatal("%s: sshkey_new failed", __func__);
- if ((challenge = BN_new()) == NULL)
- fatal("%s: BN_new failed", __func__);
-
- if ((r = sshbuf_get_u32(e->request, NULL)) != 0 || /* ignored */
- (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
- (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0 ||
- (r = sshbuf_get_bignum1(e->request, challenge)))
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
-
- /* Only protocol 1.1 is supported */
- if (sshbuf_len(e->request) == 0)
- goto failure;
- if ((r = sshbuf_get(e->request, session_id, sizeof(session_id))) != 0 ||
- (r = sshbuf_get_u32(e->request, &response_type)) != 0)
+ if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
+ (r = sshbuf_put_u32(msg, idtab->nentries)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
- if (response_type != 1)
- goto failure;
-
- id = lookup_identity(key, 1);
- if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
- struct sshkey *private = id->key;
- /* Decrypt the challenge using the private key. */
- if ((r = rsa_private_decrypt(challenge, challenge,
- private->rsa) != 0)) {
- fatal("%s: rsa_public_encrypt: %s", __func__,
+ TAILQ_FOREACH(id, &idtab->idlist, next) {
+ if ((r = sshkey_puts(id->key, msg)) != 0 ||
+ (r = sshbuf_put_cstring(msg, id->comment)) != 0) {
+ error("%s: put key/comment: %s", __func__,
ssh_err(r));
- goto failure; /* XXX ? */
+ continue;
}
-
- /* The response is MD5 of decrypted challenge plus session id */
- len = BN_num_bytes(challenge);
- if (len <= 0 || len > 32) {
- logit("%s: bad challenge length %d", __func__, len);
- goto failure;
- }
- memset(buf, 0, 32);
- BN_bn2bin(challenge, buf + 32 - len);
- if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
- ssh_digest_update(md, buf, 32) < 0 ||
- ssh_digest_update(md, session_id, 16) < 0 ||
- ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
- fatal("%s: md5 failed", __func__);
- ssh_digest_free(md);
-
- /* Send the response. */
- if ((r = sshbuf_put_u8(msg, SSH_AGENT_RSA_RESPONSE)) != 0 ||
- (r = sshbuf_put(msg, mdbuf, sizeof(mdbuf))) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
- goto send;
}
-
- failure:
- /* Unknown identity or protocol error. Send failure. */
- if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
- send:
if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
- sshkey_free(key);
- BN_clear_free(challenge);
sshbuf_free(msg);
}
-#endif
+
static char *
agent_decode_alg(struct sshkey *key, u_int flags)
@@ -387,27 +274,24 @@ agent_decode_alg(struct sshkey *key, u_int flags)
static void
process_sign_request2(SocketEntry *e)
{
- u_char *blob, *data, *signature = NULL;
- size_t blen, dlen, slen = 0;
+ const u_char *data;
+ u_char *signature = NULL;
+ size_t dlen, slen = 0;
u_int compat = 0, flags;
int r, ok = -1;
struct sshbuf *msg;
- struct sshkey *key;
+ struct sshkey *key = NULL;
struct identity *id;
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
- if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0 ||
- (r = sshbuf_get_string(e->request, &data, &dlen)) != 0 ||
+ if ((r = sshkey_froms(e->request, &key)) != 0 ||
+ (r = sshbuf_get_string_direct(e->request, &data, &dlen)) != 0 ||
(r = sshbuf_get_u32(e->request, &flags)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (flags & SSH_AGENT_OLD_SIGNATURE)
compat = SSH_BUG_SIGBLOB;
- if ((r = sshkey_from_blob(blob, blen, &key)) != 0) {
- error("%s: cannot parse key blob: %s", __func__, ssh_err(r));
- goto send;
- }
- if ((id = lookup_identity(key, 2)) == NULL) {
+ if ((id = lookup_identity(key)) == NULL) {
verbose("%s: %s key not found", __func__, sshkey_type(key));
goto send;
}
@@ -435,90 +319,52 @@ process_sign_request2(SocketEntry *e)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
sshbuf_free(msg);
- free(data);
- free(blob);
free(signature);
}
/* shared */
static void
-process_remove_identity(SocketEntry *e, int version)
+process_remove_identity(SocketEntry *e)
{
- size_t blen;
int r, success = 0;
struct sshkey *key = NULL;
- u_char *blob;
-#ifdef WITH_SSH1
- u_int bits;
-#endif /* WITH_SSH1 */
-
- switch (version) {
-#ifdef WITH_SSH1
- case 1:
- if ((key = sshkey_new(KEY_RSA1)) == NULL) {
- error("%s: sshkey_new failed", __func__);
- return;
- }
- if ((r = sshbuf_get_u32(e->request, &bits)) != 0 ||
- (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
- (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ Identity *id;
- if (bits != sshkey_size(key))
- logit("Warning: identity keysize mismatch: "
- "actual %u, announced %u",
- sshkey_size(key), bits);
- break;
-#endif /* WITH_SSH1 */
- case 2:
- if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0)
- fatal("%s: buffer error: %s", __func__, ssh_err(r));
- if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
- error("%s: sshkey_from_blob failed: %s",
- __func__, ssh_err(r));
- free(blob);
- break;
+ if ((r = sshkey_froms(e->request, &key)) != 0) {
+ error("%s: get key: %s", __func__, ssh_err(r));
+ goto done;
}
- if (key != NULL) {
- Identity *id = lookup_identity(key, version);
- if (id != NULL) {
- /*
- * We have this key. Free the old key. Since we
- * don't want to leave empty slots in the middle of
- * the array, we actually free the key there and move
- * all the entries between the empty slot and the end
- * of the array.
- */
- Idtab *tab = idtab_lookup(version);
- if (tab->nentries < 1)
- fatal("process_remove_identity: "
- "internal error: tab->nentries %d",
- tab->nentries);
- TAILQ_REMOVE(&tab->idlist, id, next);
- free_identity(id);
- tab->nentries--;
- success = 1;
- }
- sshkey_free(key);
+ if ((id = lookup_identity(key)) == NULL) {
+ debug("%s: key not found", __func__);
+ goto done;
}
+ /* We have this key, free it. */
+ if (idtab->nentries < 1)
+ fatal("%s: internal error: nentries %d",
+ __func__, idtab->nentries);
+ TAILQ_REMOVE(&idtab->idlist, id, next);
+ free_identity(id);
+ idtab->nentries--;
+ sshkey_free(key);
+ success = 1;
+ done:
send_status(e, success);
}
static void
-process_remove_all_identities(SocketEntry *e, int version)
+process_remove_all_identities(SocketEntry *e)
{
- Idtab *tab = idtab_lookup(version);
Identity *id;
/* Loop over all identities and clear the keys. */
- for (id = TAILQ_FIRST(&tab->idlist); id;
- id = TAILQ_FIRST(&tab->idlist)) {
- TAILQ_REMOVE(&tab->idlist, id, next);
+ for (id = TAILQ_FIRST(&idtab->idlist); id;
+ id = TAILQ_FIRST(&idtab->idlist)) {
+ TAILQ_REMOVE(&idtab->idlist, id, next);
free_identity(id);
}
/* Mark that there are no identities. */
- tab->nentries = 0;
+ idtab->nentries = 0;
/* Send success. */
send_status(e, 1);
@@ -530,24 +376,19 @@ reaper(void)
{
time_t deadline = 0, now = monotime();
Identity *id, *nxt;
- int version;
- Idtab *tab;
-
- for (version = 1; version < 3; version++) {
- tab = idtab_lookup(version);
- for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
- nxt = TAILQ_NEXT(id, next);
- if (id->death == 0)
- continue;
- if (now >= id->death) {
- debug("expiring key '%s'", id->comment);
- TAILQ_REMOVE(&tab->idlist, id, next);
- free_identity(id);
- tab->nentries--;
- } else
- deadline = (deadline == 0) ? id->death :
- MINIMUM(deadline, id->death);
- }
+
+ for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
+ nxt = TAILQ_NEXT(id, next);
+ if (id->death == 0)
+ continue;
+ if (now >= id->death) {
+ debug("expiring key '%s'", id->comment);
+ TAILQ_REMOVE(&idtab->idlist, id, next);
+ free_identity(id);
+ idtab->nentries--;
+ } else
+ deadline = (deadline == 0) ? id->death :
+ MINIMUM(deadline, id->death);
}
if (deadline == 0 || deadline <= now)
return 0;
@@ -555,54 +396,9 @@ reaper(void)
return (deadline - now);
}
-/*
- * XXX this and the corresponding serialisation function probably belongs
- * in key.c
- */
-#ifdef WITH_SSH1
-static int
-agent_decode_rsa1(struct sshbuf *m, struct sshkey **kp)
-{
- struct sshkey *k = NULL;
- int r = SSH_ERR_INTERNAL_ERROR;
-
- *kp = NULL;
- if ((k = sshkey_new_private(KEY_RSA1)) == NULL)
- return SSH_ERR_ALLOC_FAIL;
-
- if ((r = sshbuf_get_u32(m, NULL)) != 0 || /* ignored */
- (r = sshbuf_get_bignum1(m, k->rsa->n)) != 0 ||
- (r = sshbuf_get_bignum1(m, k->rsa->e)) != 0 ||
- (r = sshbuf_get_bignum1(m, k->rsa->d)) != 0 ||
- (r = sshbuf_get_bignum1(m, k->rsa->iqmp)) != 0 ||
- /* SSH1 and SSL have p and q swapped */
- (r = sshbuf_get_bignum1(m, k->rsa->q)) != 0 || /* p */
- (r = sshbuf_get_bignum1(m, k->rsa->p)) != 0) /* q */
- goto out;
-
- /* Generate additional parameters */
- if ((r = rsa_generate_additional_parameters(k->rsa)) != 0)
- goto out;
- /* enable blinding */
- if (RSA_blinding_on(k->rsa, NULL) != 1) {
- r = SSH_ERR_LIBCRYPTO_ERROR;
- goto out;
- }
-
- r = 0; /* success */
- out:
- if (r == 0)
- *kp = k;
- else
- sshkey_free(k);
- return r;
-}
-#endif /* WITH_SSH1 */
-
static void
-process_add_identity(SocketEntry *e, int version)
+process_add_identity(SocketEntry *e)
{
- Idtab *tab = idtab_lookup(version);
Identity *id;
int success = 0, confirm = 0;
u_int seconds;
@@ -612,17 +408,8 @@ process_add_identity(SocketEntry *e, int version)
u_char ctype;
int r = SSH_ERR_INTERNAL_ERROR;
- switch (version) {
-#ifdef WITH_SSH1
- case 1:
- r = agent_decode_rsa1(e->request, &k);
- break;
-#endif /* WITH_SSH1 */
- case 2:
- r = sshkey_private_deserialize(e->request, &k);
- break;
- }
- if (r != 0 || k == NULL ||
+ if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
+ k == NULL ||
(r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
error("%s: decode private key: %s", __func__, ssh_err(r));
goto err;
@@ -658,12 +445,12 @@ process_add_identity(SocketEntry *e, int version)
success = 1;
if (lifetime && !death)
death = monotime() + lifetime;
- if ((id = lookup_identity(k, version)) == NULL) {
+ if ((id = lookup_identity(k)) == NULL) {
id = xcalloc(1, sizeof(Identity));
id->key = k;
- TAILQ_INSERT_TAIL(&tab->idlist, id, next);
+ TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
/* Increment the number of identities. */
- tab->nentries++;
+ idtab->nentries++;
} else {
sshkey_free(k);
free(id->comment);
@@ -724,17 +511,14 @@ process_lock_agent(SocketEntry *e, int lock)
}
static void
-no_identities(SocketEntry *e, u_int type)
+no_identities(SocketEntry *e)
{
struct sshbuf *msg;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
- if ((r = sshbuf_put_u8(msg,
- (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
- SSH_AGENT_RSA_IDENTITIES_ANSWER :
- SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
+ if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
(r = sshbuf_put_u32(msg, 0)) != 0 ||
(r = sshbuf_put_stringb(e->output, msg)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
@@ -746,13 +530,12 @@ static void
process_add_smartcard_key(SocketEntry *e)
{
char *provider = NULL, *pin, canonical_provider[PATH_MAX];
- int r, i, version, count = 0, success = 0, confirm = 0;
+ int r, i, count = 0, success = 0, confirm = 0;
u_int seconds;
time_t death = 0;
u_char type;
struct sshkey **keys = NULL, *k;
Identity *id;
- Idtab *tab;
if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
(r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
@@ -772,8 +555,7 @@ process_add_smartcard_key(SocketEntry *e)
confirm = 1;
break;
default:
- error("process_add_smartcard_key: "
- "Unknown constraint type %d", type);
+ error("%s: Unknown constraint type %d", __func__, type);
goto send;
}
}
@@ -794,17 +576,15 @@ process_add_smartcard_key(SocketEntry *e)
count = pkcs11_add_provider(canonical_provider, pin, &keys);
for (i = 0; i < count; i++) {
k = keys[i];
- version = k->type == KEY_RSA1 ? 1 : 2;
- tab = idtab_lookup(version);
- if (lookup_identity(k, version) == NULL) {
+ if (lookup_identity(k) == NULL) {
id = xcalloc(1, sizeof(Identity));
id->key = k;
id->provider = xstrdup(canonical_provider);
id->comment = xstrdup(canonical_provider); /* XXX */
id->death = death;
id->confirm = confirm;
- TAILQ_INSERT_TAIL(&tab->idlist, id, next);
- tab->nentries++;
+ TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
+ idtab->nentries++;
success = 1;
} else {
sshkey_free(k);
@@ -822,9 +602,8 @@ static void
process_remove_smartcard_key(SocketEntry *e)
{
char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
- int r, version, success = 0;
+ int r, success = 0;
Identity *id, *nxt;
- Idtab *tab;
if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
(r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
@@ -838,25 +617,21 @@ process_remove_smartcard_key(SocketEntry *e)
}
debug("%s: remove %.100s", __func__, canonical_provider);
- for (version = 1; version < 3; version++) {
- tab = idtab_lookup(version);
- for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
- nxt = TAILQ_NEXT(id, next);
- /* Skip file--based keys */
- if (id->provider == NULL)
- continue;
- if (!strcmp(canonical_provider, id->provider)) {
- TAILQ_REMOVE(&tab->idlist, id, next);
- free_identity(id);
- tab->nentries--;
- }
+ for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
+ nxt = TAILQ_NEXT(id, next);
+ /* Skip file--based keys */
+ if (id->provider == NULL)
+ continue;
+ if (!strcmp(canonical_provider, id->provider)) {
+ TAILQ_REMOVE(&idtab->idlist, id, next);
+ free_identity(id);
+ idtab->nentries--;
}
}
if (pkcs11_del_provider(canonical_provider) == 0)
success = 1;
else
- error("process_remove_smartcard_key:"
- " pkcs11_del_provider failed");
+ error("%s: pkcs11_del_provider failed", __func__);
send:
free(provider);
send_status(e, success);
@@ -865,88 +640,86 @@ send:
/* dispatch incoming messages */
-static void
-process_message(SocketEntry *e)
+static int
+process_message(u_int socknum)
{
u_int msg_len;
u_char type;
const u_char *cp;
int r;
+ SocketEntry *e;
+
+ if (socknum >= sockets_alloc) {
+ fatal("%s: socket number %u >= allocated %u",
+ __func__, socknum, sockets_alloc);
+ }
+ e = &sockets[socknum];
if (sshbuf_len(e->input) < 5)
- return; /* Incomplete message. */
+ return 0; /* Incomplete message header. */
cp = sshbuf_ptr(e->input);
msg_len = PEEK_U32(cp);
- if (msg_len > 256 * 1024) {
- close_socket(e);
- return;
+ if (msg_len > AGENT_MAX_LEN) {
+ debug("%s: socket %u (fd=%d) message too long %u > %u",
+ __func__, socknum, e->fd, msg_len, AGENT_MAX_LEN);
+ return -1;
}
if (sshbuf_len(e->input) < msg_len + 4)
- return;
+ return 0; /* Incomplete message body. */
/* move the current input to e->request */
sshbuf_reset(e->request);
if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
- (r = sshbuf_get_u8(e->request, &type)) != 0)
+ (r = sshbuf_get_u8(e->request, &type)) != 0) {
+ if (r == SSH_ERR_MESSAGE_INCOMPLETE ||
+ r == SSH_ERR_STRING_TOO_LARGE) {
+ debug("%s: buffer error: %s", __func__, ssh_err(r));
+ return -1;
+ }
fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ }
+
+ debug("%s: socket %u (fd=%d) type %d", __func__, socknum, e->fd, type);
/* check wheter agent is locked */
if (locked && type != SSH_AGENTC_UNLOCK) {
sshbuf_reset(e->request);
switch (type) {
- case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
case SSH2_AGENTC_REQUEST_IDENTITIES:
/* send empty lists */
- no_identities(e, type);
+ no_identities(e);
break;
default:
/* send a fail message for all other request types */
send_status(e, 0);
}
- return;
+ return 0;
}
- debug("type %d", type);
switch (type) {
case SSH_AGENTC_LOCK:
case SSH_AGENTC_UNLOCK:
process_lock_agent(e, type == SSH_AGENTC_LOCK);
break;
-#ifdef WITH_SSH1
- /* ssh1 */
- case SSH_AGENTC_RSA_CHALLENGE:
- process_authentication_challenge1(e);
- break;
- case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
- process_request_identities(e, 1);
- break;
- case SSH_AGENTC_ADD_RSA_IDENTITY:
- case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
- process_add_identity(e, 1);
- break;
- case SSH_AGENTC_REMOVE_RSA_IDENTITY:
- process_remove_identity(e, 1);
- break;
-#endif
case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
- process_remove_all_identities(e, 1); /* safe for !WITH_SSH1 */
+ process_remove_all_identities(e); /* safe for !WITH_SSH1 */
break;
/* ssh2 */
case SSH2_AGENTC_SIGN_REQUEST:
process_sign_request2(e);
break;
case SSH2_AGENTC_REQUEST_IDENTITIES:
- process_request_identities(e, 2);
+ process_request_identities(e);
break;
case SSH2_AGENTC_ADD_IDENTITY:
case SSH2_AGENTC_ADD_ID_CONSTRAINED:
- process_add_identity(e, 2);
+ process_add_identity(e);
break;
case SSH2_AGENTC_REMOVE_IDENTITY:
- process_remove_identity(e, 2);
+ process_remove_identity(e);
break;
case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
- process_remove_all_identities(e, 2);
+ process_remove_all_identities(e);
break;
#ifdef ENABLE_PKCS11
case SSH_AGENTC_ADD_SMARTCARD_KEY:
@@ -964,6 +737,7 @@ process_message(SocketEntry *e)
send_status(e, 0);
break;
}
+ return 0;
}
static void
@@ -1005,19 +779,141 @@ new_socket(sock_type type, int fd)
}
static int
-prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
- struct timeval **tvpp)
+handle_socket_read(u_int socknum)
+{
+ struct sockaddr_un sunaddr;
+ socklen_t slen;
+ uid_t euid;
+ gid_t egid;
+ int fd;
+
+ slen = sizeof(sunaddr);
+ fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen);
+ if (fd < 0) {
+ error("accept from AUTH_SOCKET: %s", strerror(errno));
+ return -1;
+ }
+ if (getpeereid(fd, &euid, &egid) < 0) {
+ error("getpeereid %d failed: %s", fd, strerror(errno));
+ close(fd);
+ return -1;
+ }
+ if ((euid != 0) && (getuid() != euid)) {
+ error("uid mismatch: peer euid %u != uid %u",
+ (u_int) euid, (u_int) getuid());
+ close(fd);
+ return -1;
+ }
+ new_socket(AUTH_CONNECTION, fd);
+ return 0;
+}
+
+static int
+handle_conn_read(u_int socknum)
+{
+ char buf[1024];
+ ssize_t len;
+ int r;
+
+ if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) {
+ if (len == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+ error("%s: read error on socket %u (fd %d): %s",
+ __func__, socknum, sockets[socknum].fd,
+ strerror(errno));
+ }
+ return -1;
+ }
+ if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ explicit_bzero(buf, sizeof(buf));
+ process_message(socknum);
+ return 0;
+}
+
+static int
+handle_conn_write(u_int socknum)
{
- u_int i, sz;
- int n = 0;
- static struct timeval tv;
+ ssize_t len;
+ int r;
+
+ if (sshbuf_len(sockets[socknum].output) == 0)
+ return 0; /* shouldn't happen */
+ if ((len = write(sockets[socknum].fd,
+ sshbuf_ptr(sockets[socknum].output),
+ sshbuf_len(sockets[socknum].output))) <= 0) {
+ if (len == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+ error("%s: read error on socket %u (fd %d): %s",
+ __func__, socknum, sockets[socknum].fd,
+ strerror(errno));
+ }
+ return -1;
+ }
+ if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ return 0;
+}
+
+static void
+after_poll(struct pollfd *pfd, size_t npfd)
+{
+ size_t i;
+ u_int socknum;
+
+ for (i = 0; i < npfd; i++) {
+ if (pfd[i].revents == 0)
+ continue;
+ /* Find sockets entry */
+ for (socknum = 0; socknum < sockets_alloc; socknum++) {
+ if (sockets[socknum].type != AUTH_SOCKET &&
+ sockets[socknum].type != AUTH_CONNECTION)
+ continue;
+ if (pfd[i].fd == sockets[socknum].fd)
+ break;
+ }
+ if (socknum >= sockets_alloc) {
+ error("%s: no socket for fd %d", __func__, pfd[i].fd);
+ continue;
+ }
+ /* Process events */
+ switch (sockets[socknum].type) {
+ case AUTH_SOCKET:
+ if ((pfd[i].revents & (POLLIN|POLLERR)) != 0 &&
+ handle_socket_read(socknum) != 0)
+ close_socket(&sockets[socknum]);
+ break;
+ case AUTH_CONNECTION:
+ if ((pfd[i].revents & (POLLIN|POLLERR)) != 0 &&
+ handle_conn_read(socknum) != 0) {
+ close_socket(&sockets[socknum]);
+ break;
+ }
+ if ((pfd[i].revents & (POLLOUT|POLLHUP)) != 0 &&
+ handle_conn_write(socknum) != 0)
+ close_socket(&sockets[socknum]);
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+static int
+prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp)
+{
+ struct pollfd *pfd = *pfdp;
+ size_t i, j, npfd = 0;
time_t deadline;
+ /* Count active sockets */
for (i = 0; i < sockets_alloc; i++) {
switch (sockets[i].type) {
case AUTH_SOCKET:
case AUTH_CONNECTION:
- n = MAXIMUM(n, sockets[i].fd);
+ npfd++;
break;
case AUTH_UNUSED:
break;
@@ -1026,28 +922,23 @@ prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
break;
}
}
+ if (npfd != *npfdp &&
+ (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL)
+ fatal("%s: recallocarray failed", __func__);
+ *pfdp = pfd;
+ *npfdp = npfd;
- sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
- if (*fdrp == NULL || sz > *nallocp) {
- free(*fdrp);
- free(*fdwp);
- *fdrp = xmalloc(sz);
- *fdwp = xmalloc(sz);
- *nallocp = sz;
- }
- if (n < *fdl)
- debug("XXX shrink: %d < %d", n, *fdl);
- *fdl = n;
- memset(*fdrp, 0, sz);
- memset(*fdwp, 0, sz);
-
- for (i = 0; i < sockets_alloc; i++) {
+ for (i = j = 0; i < sockets_alloc; i++) {
switch (sockets[i].type) {
case AUTH_SOCKET:
case AUTH_CONNECTION:
- FD_SET(sockets[i].fd, *fdrp);
+ pfd[j].fd = sockets[i].fd;
+ pfd[j].revents = 0;
+ /* XXX backoff when input buffer full */
+ pfd[j].events = POLLIN;
if (sshbuf_len(sockets[i].output) > 0)
- FD_SET(sockets[i].fd, *fdwp);
+ pfd[j].events |= POLLOUT;
+ j++;
break;
default:
break;
@@ -1058,99 +949,17 @@ prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
deadline = (deadline == 0) ? parent_alive_interval :
MINIMUM(deadline, parent_alive_interval);
if (deadline == 0) {
- *tvpp = NULL;
+ *timeoutp = -1; /* INFTIM */
} else {
- tv.tv_sec = deadline;
- tv.tv_usec = 0;
- *tvpp = &tv;
+ if (deadline > INT_MAX / 1000)
+ *timeoutp = INT_MAX / 1000;
+ else
+ *timeoutp = deadline * 1000;
}
return (1);
}
static void
-after_select(fd_set *readset, fd_set *writeset)
-{
- struct sockaddr_un sunaddr;
- socklen_t slen;
- char buf[1024];
- int len, sock, r;
- u_int i, orig_alloc;
- uid_t euid;
- gid_t egid;
-
- for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
- switch (sockets[i].type) {
- case AUTH_UNUSED:
- break;
- case AUTH_SOCKET:
- if (FD_ISSET(sockets[i].fd, readset)) {
- slen = sizeof(sunaddr);
- sock = accept(sockets[i].fd,
- (struct sockaddr *)&sunaddr, &slen);
- if (sock < 0) {
- error("accept from AUTH_SOCKET: %s",
- strerror(errno));
- break;
- }
- if (getpeereid(sock, &euid, &egid) < 0) {
- error("getpeereid %d failed: %s",
- sock, strerror(errno));
- close(sock);
- break;
- }
- if ((euid != 0) && (getuid() != euid)) {
- error("uid mismatch: "
- "peer euid %u != uid %u",
- (u_int) euid, (u_int) getuid());
- close(sock);
- break;
- }
- new_socket(AUTH_CONNECTION, sock);
- }
- break;
- case AUTH_CONNECTION:
- if (sshbuf_len(sockets[i].output) > 0 &&
- FD_ISSET(sockets[i].fd, writeset)) {
- len = write(sockets[i].fd,
- sshbuf_ptr(sockets[i].output),
- sshbuf_len(sockets[i].output));
- if (len == -1 && (errno == EAGAIN ||
- errno == EWOULDBLOCK ||
- errno == EINTR))
- continue;
- if (len <= 0) {
- close_socket(&sockets[i]);
- break;
- }
- if ((r = sshbuf_consume(sockets[i].output,
- len)) != 0)
- fatal("%s: buffer error: %s",
- __func__, ssh_err(r));
- }
- if (FD_ISSET(sockets[i].fd, readset)) {
- len = read(sockets[i].fd, buf, sizeof(buf));
- if (len == -1 && (errno == EAGAIN ||
- errno == EWOULDBLOCK ||
- errno == EINTR))
- continue;
- if (len <= 0) {
- close_socket(&sockets[i]);
- break;
- }
- if ((r = sshbuf_put(sockets[i].input,
- buf, len)) != 0)
- fatal("%s: buffer error: %s",
- __func__, ssh_err(r));
- explicit_bzero(buf, sizeof(buf));
- process_message(&sockets[i]);
- }
- break;
- default:
- fatal("Unknown type %d", sockets[i].type);
- }
-}
-
-static void
cleanup_socket(void)
{
if (cleanup_pid != 0 && getpid() != cleanup_pid)
@@ -1209,9 +1018,7 @@ main(int ac, char **av)
{
int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
int sock, fd, ch, result, saved_errno;
- u_int nalloc;
char *shell, *format, *pidstr, *agentsocket = NULL;
- fd_set *readsetp = NULL, *writesetp = NULL;
#ifdef HAVE_SETRLIMIT
struct rlimit rlim;
#endif
@@ -1219,9 +1026,11 @@ main(int ac, char **av)
extern char *optarg;
pid_t pid;
char pidstrbuf[1 + 3 * sizeof pid];
- struct timeval *tvp = NULL;
size_t len;
mode_t prev_mask;
+ int timeout = -1; /* INFTIM */
+ struct pollfd *pfd = NULL;
+ size_t npfd = 0;
ssh_malloc_init(); /* must be called before any mallocs */
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
@@ -1442,15 +1251,14 @@ skip:
signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
signal(SIGHUP, cleanup_handler);
signal(SIGTERM, cleanup_handler);
- nalloc = 0;
if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
fatal("%s: pledge: %s", __progname, strerror(errno));
platform_pledge_agent();
while (1) {
- prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
- result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
+ prepare_poll(&pfd, &npfd, &timeout);
+ result = poll(pfd, npfd, timeout);
saved_errno = errno;
if (parent_alive_interval != 0)
check_parent_exists();
@@ -1458,9 +1266,9 @@ skip:
if (result < 0) {
if (saved_errno == EINTR)
continue;
- fatal("select: %s", strerror(saved_errno));
+ fatal("poll: %s", strerror(saved_errno));
} else if (result > 0)
- after_select(readsetp, writesetp);
+ after_poll(pfd, npfd);
}
/* NOTREACHED */
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-11 17:36:01 +0000