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avoid fatal() calls in packet code makes ssh-keyscan more
 reliable against server failures ok dtucker@ markus@
This commit is contained in:
djm@openbsd.org 2015-01-28 21:15:47 +00:00 committed by Damien Miller
parent 1a3d14f6b4
commit fae7bbe544
7 changed files with 54 additions and 29 deletions
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25
opacket.c
View File

@ -255,8 +255,20 @@ packet_read_seqnr(u_int32_t *seqnr)
u_char type;
int r;
if ((r = ssh_packet_read_seqnr(active_state, &type, seqnr)))
fatal("%s: %s", __func__, ssh_err(r));
if ((r = ssh_packet_read_seqnr(active_state, &type, seqnr)) != 0) {
switch (r) {
case SSH_ERR_CONN_CLOSED:
logit("Connection closed by %.200s",
ssh_remote_ipaddr(active_state));
cleanup_exit(255);
case SSH_ERR_CONN_TIMEOUT:
logit("Connection to %.200s timed out while "
"waiting to read", ssh_remote_ipaddr(active_state));
cleanup_exit(255);
default:
fatal("%s: %s", __func__, ssh_err(r));
}
}
return type;
}
@ -277,3 +289,12 @@ packet_close(void)
ssh_packet_close(active_state);
active_state = NULL;
}
void
packet_process_incoming(const char *buf, u_int len)
{
int r;
if ((r = ssh_packet_process_incoming(active_state, buf, len)) != 0)
fatal("%s: %s", __func__, ssh_err(r));
}

3
opacket.h
View File

@ -44,6 +44,7 @@ void packet_restore_state(void);
void packet_set_connection(int, int);
int packet_read_seqnr(u_int32_t *);
int packet_read_poll_seqnr(u_int32_t *);
void packet_process_incoming(const char *buf, u_int len);
#define packet_set_timeout(timeout, count) \
ssh_packet_set_timeout(active_state, (timeout), (count))
#define packet_connection_is_on_socket() \
@ -86,8 +87,6 @@ int packet_read_poll_seqnr(u_int32_t *);
ssh_packet_read(active_state)
#define packet_read_expect(expected_type) \
ssh_packet_read_expect(active_state, (expected_type))
#define packet_process_incoming(buf, len) \
ssh_packet_process_incoming(active_state, (buf), (len))
#define packet_get_int64() \
ssh_packet_get_int64(active_state)
#define packet_get_bignum(value) \

33
packet.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: packet.c,v 1.203 2015/01/20 23:14:00 deraadt Exp $ */
/* $OpenBSD: packet.c,v 1.204 2015/01/28 21:15:47 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1314,26 +1314,22 @@ ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
break;
}
}
if (r == 0) {
logit("Connection to %.200s timed out while "
"waiting to read", ssh_remote_ipaddr(ssh));
cleanup_exit(255);
}
if (r == 0)
return SSH_ERR_CONN_TIMEOUT;
/* Read data from the socket. */
do {
cont = 0;
len = roaming_read(state->connection_in, buf,
sizeof(buf), &cont);
} while (len == 0 && cont);
if (len == 0) {
logit("Connection closed by %.200s",
ssh_remote_ipaddr(ssh));
cleanup_exit(255);
}
if (len == 0)
return SSH_ERR_CONN_CLOSED;
if (len < 0)
fatal("Read from socket failed: %.100s", strerror(errno));
return SSH_ERR_SYSTEM_ERROR;
/* Append it to the buffer. */
ssh_packet_process_incoming(ssh, buf, len);
if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0)
return r;
}
free(setp);
return r;
@ -1787,7 +1783,7 @@ ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
* together with packet_read_poll.
*/
void
int
ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
{
struct session_state *state = ssh->state;
@ -1797,14 +1793,15 @@ ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
state->keep_alive_timeouts = 0; /* ?? */
if (len >= state->packet_discard) {
if ((r = ssh_packet_stop_discard(ssh)) != 0)
fatal("%s: %s", __func__, ssh_err(r));
cleanup_exit(255);
return r;
}
state->packet_discard -= len;
return;
return 0;
}
if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0)
fatal("%s: %s", __func__, ssh_err(r));
return r;
return 0;
}
int

4
packet.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: packet.h,v 1.64 2015/01/19 20:30:23 markus Exp $ */
/* $OpenBSD: packet.h,v 1.65 2015/01/28 21:15:47 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@ -94,7 +94,7 @@ void ssh_packet_read_expect(struct ssh *, int type);
int ssh_packet_read_poll(struct ssh *);
int ssh_packet_read_poll1(struct ssh *, u_char *);
int ssh_packet_read_poll2(struct ssh *, u_char *, u_int32_t *seqnr_p);
void ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len);
int ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len);
int ssh_packet_read_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
int ssh_packet_read_poll_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);

8
ssh-keyscan.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keyscan.c,v 1.96 2015/01/20 23:14:00 deraadt Exp $ */
/* $OpenBSD: ssh-keyscan.c,v 1.97 2015/01/28 21:15:47 djm Exp $ */
/*
* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
*
@ -319,8 +319,10 @@ tcpconnect(char *host)
memset(&hints, 0, sizeof(hints));
hints.ai_family = IPv4or6;
hints.ai_socktype = SOCK_STREAM;
if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
return -1;
}
for (ai = aitop; ai; ai = ai->ai_next) {
s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (s < 0) {

6
ssherr.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssherr.c,v 1.1 2014/04/30 05:29:56 djm Exp $ */
/* $OpenBSD: ssherr.c,v 1.2 2015/01/28 21:15:47 djm Exp $ */
/*
* Copyright (c) 2011 Damien Miller
*
@ -125,6 +125,10 @@ ssh_err(int n)
return "KRL file has invalid magic number";
case SSH_ERR_KEY_REVOKED:
return "Key is revoked";
case SSH_ERR_CONN_CLOSED:
return "Connection closed";
case SSH_ERR_CONN_TIMEOUT:
return "Connection timed out";
default:
return "unknown error";
}

4
ssherr.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssherr.h,v 1.1 2014/04/30 05:29:56 djm Exp $ */
/* $OpenBSD: ssherr.h,v 1.2 2015/01/28 21:15:47 djm Exp $ */
/*
* Copyright (c) 2011 Damien Miller
*
@ -73,6 +73,8 @@
#define SSH_ERR_BUFFER_READ_ONLY -49
#define SSH_ERR_KRL_BAD_MAGIC -50
#define SSH_ERR_KEY_REVOKED -51
#define SSH_ERR_CONN_CLOSED -52
#define SSH_ERR_CONN_TIMEOUT -53
/* Translate a numeric error code to a human-readable error string */
const char *ssh_err(int n);