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authorDamien Miller <djm@mindrot.org>2011-06-20 14:42:23 +1000
committerDamien Miller <djm@mindrot.org>2011-06-20 14:42:23 +1000
commit8f0bf237d4e699d00c2febaf1b88a9b9b827e77e (patch)
tree212a2ef9014a216e7ab96060e81ab3c1d737ba7c
parente7ac2bd42ad16c2e2485331641befedebaebdb46 (diff)
- djm@cvs.openbsd.org 2011/06/17 21:44:31
[log.c log.h monitor.c monitor.h monitor_wrap.c monitor_wrap.h sshd.c] make the pre-auth privsep slave log via a socketpair shared with the monitor rather than /var/empty/dev/log; ok dtucker@ deraadt@ markus@
-rw-r--r--ChangeLog4
-rw-r--r--log.c35
-rw-r--r--log.h8
-rw-r--r--monitor.c128
-rw-r--r--monitor.h4
-rw-r--r--monitor_wrap.c28
-rw-r--r--monitor_wrap.h3
-rw-r--r--sshd.c13
8 files changed, 197 insertions, 26 deletions
diff --git a/ChangeLog b/ChangeLog
index 5dae2a85..d4120809 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,10 @@
make sure key_parse_public/private_rsa1() no longer consumes its input
buffer. fixes ssh-add for passphrase-protected ssh1-keys;
noted by naddy@; ok djm@
+ - djm@cvs.openbsd.org 2011/06/17 21:44:31
+ [log.c log.h monitor.c monitor.h monitor_wrap.c monitor_wrap.h sshd.c]
+ make the pre-auth privsep slave log via a socketpair shared with the
+ monitor rather than /var/empty/dev/log; ok dtucker@ deraadt@ markus@
20110603
- (dtucker) [README version.h contrib/caldera/openssh.spec
diff --git a/log.c b/log.c
index 4a8239b9..ad5a10b4 100644
--- a/log.c
+++ b/log.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: log.c,v 1.41 2008/06/10 04:50:25 dtucker Exp $ */
+/* $OpenBSD: log.c,v 1.42 2011/06/17 21:44:30 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -56,6 +56,8 @@ static LogLevel log_level = SYSLOG_LEVEL_INFO;
static int log_on_stderr = 1;
static int log_facility = LOG_AUTH;
static char *argv0;
+static log_handler_fn *log_handler;
+static void *log_handler_ctx;
extern char *__progname;
@@ -260,6 +262,9 @@ log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
exit(1);
}
+ log_handler = NULL;
+ log_handler_ctx = NULL;
+
log_on_stderr = on_stderr;
if (on_stderr)
return;
@@ -327,6 +332,23 @@ log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
#define MSGBUFSIZ 1024
void
+set_log_handler(log_handler_fn *handler, void *ctx)
+{
+ log_handler = handler;
+ log_handler_ctx = ctx;
+}
+
+void
+do_log2(LogLevel level, const char *fmt,...)
+{
+ va_list args;
+
+ va_start(args, fmt);
+ do_log(level, fmt, args);
+ va_end(args);
+}
+
+void
do_log(LogLevel level, const char *fmt, va_list args)
{
#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
@@ -337,6 +359,7 @@ do_log(LogLevel level, const char *fmt, va_list args)
char *txt = NULL;
int pri = LOG_INFO;
int saved_errno = errno;
+ log_handler_fn *tmp_handler;
if (level > log_level)
return;
@@ -375,7 +398,7 @@ do_log(LogLevel level, const char *fmt, va_list args)
pri = LOG_ERR;
break;
}
- if (txt != NULL) {
+ if (txt != NULL && log_handler == NULL) {
snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
} else {
@@ -383,7 +406,13 @@ do_log(LogLevel level, const char *fmt, va_list args)
}
strnvis(fmtbuf, msgbuf, sizeof(fmtbuf),
log_on_stderr ? LOG_STDERR_VIS : LOG_SYSLOG_VIS);
- if (log_on_stderr) {
+ if (log_handler != NULL) {
+ /* Avoid recursion */
+ tmp_handler = log_handler;
+ log_handler = NULL;
+ tmp_handler(level, fmtbuf, log_handler_ctx);
+ log_handler = tmp_handler;
+ } else if (log_on_stderr) {
snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
write(STDERR_FILENO, msgbuf, strlen(msgbuf));
} else {
diff --git a/log.h b/log.h
index 65058279..1b8d2142 100644
--- a/log.h
+++ b/log.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: log.h,v 1.17 2008/06/13 00:12:02 dtucker Exp $ */
+/* $OpenBSD: log.h,v 1.18 2011/06/17 21:44:30 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -46,6 +46,8 @@ typedef enum {
SYSLOG_LEVEL_NOT_SET = -1
} LogLevel;
+typedef void (log_handler_fn)(LogLevel, const char *, void *);
+
void log_init(char *, LogLevel, SyslogFacility, int);
SyslogFacility log_facility_number(char *);
@@ -64,6 +66,10 @@ void debug(const char *, ...) __attribute__((format(printf, 1, 2)));
void debug2(const char *, ...) __attribute__((format(printf, 1, 2)));
void debug3(const char *, ...) __attribute__((format(printf, 1, 2)));
+
+void set_log_handler(log_handler_fn *, void *);
+void do_log2(LogLevel, const char *, ...)
+ __attribute__((format(printf, 2, 3)));
void do_log(LogLevel, const char *, va_list);
void cleanup_exit(int) __attribute__((noreturn));
#endif
diff --git a/monitor.c b/monitor.c
index 2c925418..bb8003c6 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor.c,v 1.113 2011/05/23 03:30:07 djm Exp $ */
+/* $OpenBSD: monitor.c,v 1.114 2011/06/17 21:44:30 djm Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* Copyright 2002 Markus Friedl <markus@openbsd.org>
@@ -44,6 +44,13 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#else
+# ifdef HAVE_SYS_POLL_H
+# include <sys/poll.h>
+# endif
+#endif
#ifdef SKEY
#include <skey.h>
@@ -52,6 +59,7 @@
#include <openssl/dh.h>
#include "openbsd-compat/sys-queue.h"
+#include "atomicio.h"
#include "xmalloc.h"
#include "ssh.h"
#include "key.h"
@@ -179,6 +187,8 @@ int mm_answer_audit_event(int, Buffer *);
int mm_answer_audit_command(int, Buffer *);
#endif
+static int monitor_read_log(struct monitor *);
+
static Authctxt *authctxt;
static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
@@ -346,6 +356,10 @@ monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
debug3("preauth child monitor started");
+ close(pmonitor->m_recvfd);
+ close(pmonitor->m_log_sendfd);
+ pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
+
authctxt = _authctxt;
memset(authctxt, 0, sizeof(*authctxt));
@@ -405,6 +419,10 @@ monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
#endif
}
+ /* Drain any buffered messages from the child */
+ while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
+ ;
+
if (!authctxt->valid)
fatal("%s: authenticated invalid user", __func__);
if (strcmp(auth_method, "unknown") == 0)
@@ -414,6 +432,10 @@ monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
__func__, authctxt->user);
mm_get_keystate(pmonitor);
+
+ close(pmonitor->m_sendfd);
+ close(pmonitor->m_log_recvfd);
+ pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
}
static void
@@ -431,6 +453,9 @@ monitor_child_handler(int sig)
void
monitor_child_postauth(struct monitor *pmonitor)
{
+ close(pmonitor->m_recvfd);
+ pmonitor->m_recvfd = -1;
+
monitor_set_child_handler(pmonitor->m_pid);
signal(SIGHUP, &monitor_child_handler);
signal(SIGTERM, &monitor_child_handler);
@@ -454,6 +479,9 @@ monitor_child_postauth(struct monitor *pmonitor)
for (;;)
monitor_read(pmonitor, mon_dispatch, NULL);
+
+ close(pmonitor->m_sendfd);
+ pmonitor->m_sendfd = -1;
}
void
@@ -465,6 +493,52 @@ monitor_sync(struct monitor *pmonitor)
}
}
+static int
+monitor_read_log(struct monitor *pmonitor)
+{
+ Buffer logmsg;
+ u_int len, level;
+ char *msg;
+
+ buffer_init(&logmsg);
+
+ /* Read length */
+ buffer_append_space(&logmsg, 4);
+ if (atomicio(read, pmonitor->m_log_recvfd,
+ buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
+ if (errno == EPIPE) {
+ debug("%s: child log fd closed", __func__);
+ close(pmonitor->m_log_recvfd);
+ pmonitor->m_log_recvfd = -1;
+ return -1;
+ }
+ fatal("%s: log fd read: %s", __func__, strerror(errno));
+ }
+ len = buffer_get_int(&logmsg);
+ if (len <= 4 || len > 8192)
+ fatal("%s: invalid log message length %u", __func__, len);
+
+ /* Read severity, message */
+ buffer_clear(&logmsg);
+ buffer_append_space(&logmsg, len);
+ if (atomicio(read, pmonitor->m_log_recvfd,
+ buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
+ fatal("%s: log fd read: %s", __func__, strerror(errno));
+
+ /* Log it */
+ level = buffer_get_int(&logmsg);
+ msg = buffer_get_string(&logmsg, NULL);
+ if (log_level_name(level) == NULL)
+ fatal("%s: invalid log level %u (corrupted message?)",
+ __func__, level);
+ do_log2(level, "%s [preauth]", msg);
+
+ buffer_free(&logmsg);
+ xfree(msg);
+
+ return 0;
+}
+
int
monitor_read(struct monitor *pmonitor, struct mon_table *ent,
struct mon_table **pent)
@@ -472,6 +546,27 @@ monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Buffer m;
int ret;
u_char type;
+ struct pollfd pfd[2];
+
+ for (;;) {
+ bzero(&pfd, sizeof(pfd));
+ pfd[0].fd = pmonitor->m_sendfd;
+ pfd[0].events = POLLIN;
+ pfd[1].fd = pmonitor->m_log_recvfd;
+ pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
+ if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1)
+ fatal("%s: poll: %s", __func__, strerror(errno));
+ if (pfd[1].revents) {
+ /*
+ * Drain all log messages before processing next
+ * monitor request.
+ */
+ monitor_read_log(pmonitor);
+ continue;
+ }
+ if (pfd[0].revents)
+ break; /* Continues below */
+ }
buffer_init(&m);
@@ -1851,12 +1946,26 @@ mm_init_compression(struct mm_master *mm)
} while (0)
static void
-monitor_socketpair(int *pair)
+monitor_openfds(struct monitor *mon, int do_logfds)
{
+ int pair[2];
+
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
- fatal("%s: socketpair", __func__);
+ fatal("%s: socketpair: %s", __func__, strerror(errno));
FD_CLOSEONEXEC(pair[0]);
FD_CLOSEONEXEC(pair[1]);
+ mon->m_recvfd = pair[0];
+ mon->m_sendfd = pair[1];
+
+ if (do_logfds) {
+ if (pipe(pair) == -1)
+ fatal("%s: pipe: %s", __func__, strerror(errno));
+ FD_CLOSEONEXEC(pair[0]);
+ FD_CLOSEONEXEC(pair[1]);
+ mon->m_log_recvfd = pair[0];
+ mon->m_log_sendfd = pair[1];
+ } else
+ mon->m_log_recvfd = mon->m_log_sendfd = -1;
}
#define MM_MEMSIZE 65536
@@ -1865,14 +1974,10 @@ struct monitor *
monitor_init(void)
{
struct monitor *mon;
- int pair[2];
mon = xcalloc(1, sizeof(*mon));
- monitor_socketpair(pair);
-
- mon->m_recvfd = pair[0];
- mon->m_sendfd = pair[1];
+ monitor_openfds(mon, 1);
/* Used to share zlib space across processes */
if (options.compression) {
@@ -1889,12 +1994,7 @@ monitor_init(void)
void
monitor_reinit(struct monitor *mon)
{
- int pair[2];
-
- monitor_socketpair(pair);
-
- mon->m_recvfd = pair[0];
- mon->m_sendfd = pair[1];
+ monitor_openfds(mon, 0);
}
#ifdef GSSAPI
diff --git a/monitor.h b/monitor.h
index a8a2c0c1..5e7d552f 100644
--- a/monitor.h
+++ b/monitor.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor.h,v 1.15 2008/11/04 08:22:13 djm Exp $ */
+/* $OpenBSD: monitor.h,v 1.16 2011/06/17 21:44:31 djm Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
@@ -72,6 +72,8 @@ struct mm_master;
struct monitor {
int m_recvfd;
int m_sendfd;
+ int m_log_recvfd;
+ int m_log_sendfd;
struct mm_master *m_zback;
struct mm_master *m_zlib;
struct Kex **m_pkex;
diff --git a/monitor_wrap.c b/monitor_wrap.c
index 7a90b3ba..1f60658e 100644
--- a/monitor_wrap.c
+++ b/monitor_wrap.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor_wrap.c,v 1.72 2011/05/23 03:30:07 djm Exp $ */
+/* $OpenBSD: monitor_wrap.c,v 1.73 2011/06/17 21:44:31 djm Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* Copyright 2002 Markus Friedl <markus@openbsd.org>
@@ -88,6 +88,32 @@ extern struct monitor *pmonitor;
extern Buffer loginmsg;
extern ServerOptions options;
+void
+mm_log_handler(LogLevel level, const char *msg, void *ctx)
+{
+ Buffer log_msg;
+ struct monitor *mon = (struct monitor *)ctx;
+
+ if (mon->m_log_sendfd == -1)
+ fatal("%s: no log channel", __func__);
+
+ buffer_init(&log_msg);
+ /*
+ * Placeholder for packet length. Will be filled in with the actual
+ * packet length once the packet has been constucted. This saves
+ * fragile math.
+ */
+ buffer_put_int(&log_msg, 0);
+
+ buffer_put_int(&log_msg, level);
+ buffer_put_cstring(&log_msg, msg);
+ put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
+ if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
+ buffer_len(&log_msg)) != buffer_len(&log_msg))
+ fatal("%s: write: %s", __func__, strerror(errno));
+ buffer_free(&log_msg);
+}
+
int
mm_is_monitor(void)
{
diff --git a/monitor_wrap.h b/monitor_wrap.h
index de2d16f6..0c7f2e38 100644
--- a/monitor_wrap.h
+++ b/monitor_wrap.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor_wrap.h,v 1.22 2009/03/05 07:18:19 djm Exp $ */
+/* $OpenBSD: monitor_wrap.h,v 1.23 2011/06/17 21:44:31 djm Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
@@ -37,6 +37,7 @@ struct monitor;
struct mm_master;
struct Authctxt;
+void mm_log_handler(LogLevel, const char *, void *);
int mm_is_monitor(void);
DH *mm_choose_dh(int, int, int);
int mm_key_sign(Key *, u_char **, u_int *, u_char *, u_int);
diff --git a/sshd.c b/sshd.c
index 50d0dede..6e15522b 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshd.c,v 1.382 2011/04/12 05:32:49 djm Exp $ */
+/* $OpenBSD: sshd.c,v 1.383 2011/06/17 21:44:31 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -636,10 +636,8 @@ privsep_preauth(Authctxt *authctxt)
} else if (pid != 0) {
debug2("Network child is on pid %ld", (long)pid);
- close(pmonitor->m_recvfd);
pmonitor->m_pid = pid;
monitor_child_preauth(authctxt, pmonitor);
- close(pmonitor->m_sendfd);
/* Sync memory */
monitor_sync(pmonitor);
@@ -651,8 +649,11 @@ privsep_preauth(Authctxt *authctxt)
return (1);
} else {
/* child */
-
close(pmonitor->m_sendfd);
+ close(pmonitor->m_log_recvfd);
+
+ /* Arrange for logging to be sent to the monitor */
+ set_log_handler(mm_log_handler, pmonitor);
/* Demote the child */
if (getuid() == 0 || geteuid() == 0)
@@ -685,7 +686,6 @@ privsep_postauth(Authctxt *authctxt)
fatal("fork of unprivileged child failed");
else if (pmonitor->m_pid != 0) {
verbose("User child is on pid %ld", (long)pmonitor->m_pid);
- close(pmonitor->m_recvfd);
buffer_clear(&loginmsg);
monitor_child_postauth(pmonitor);
@@ -693,7 +693,10 @@ privsep_postauth(Authctxt *authctxt)
exit(0);
}
+ /* child */
+
close(pmonitor->m_sendfd);
+ pmonitor->m_sendfd = -1;
/* Demote the private keys to public keys. */
demote_sensitive_data();