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log via monitor in chroots without /dev/log

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This commit is contained in:
Petr Lautrbach 2014-12-19 10:14:36 +01:00
parent 720cf82ef2
commit 7a7b8f0984
2 changed files with 298 additions and 0 deletions
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295
openssh-6.6.1p1-log-in-chroot.patch Normal file
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@ -0,0 +1,295 @@
diff --git a/log.c b/log.c
index 32e1d2e..d4caeb5 100644
--- a/log.c
+++ b/log.c
@@ -241,6 +241,11 @@ debug3(const char *fmt,...)
void
log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
{
+ log_init_handler(av0, level, facility, on_stderr, 1);
+}
+
+void
+log_init_handler(char *av0, LogLevel level, SyslogFacility facility, int on_stderr, int reset_handler) {
#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
struct syslog_data sdata = SYSLOG_DATA_INIT;
#endif
@@ -264,8 +269,10 @@ log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
exit(1);
}
- log_handler = NULL;
- log_handler_ctx = NULL;
+ if (reset_handler) {
+ log_handler = NULL;
+ log_handler_ctx = NULL;
+ }
log_on_stderr = on_stderr;
if (on_stderr)
diff --git a/log.h b/log.h
index ae7df25..30c3310 100644
--- a/log.h
+++ b/log.h
@@ -49,6 +49,7 @@ typedef enum {
typedef void (log_handler_fn)(LogLevel, const char *, void *);
void log_init(char *, LogLevel, SyslogFacility, int);
+void log_init_handler(char *, LogLevel, SyslogFacility, int, int);
void log_change_level(LogLevel);
int log_is_on_stderr(void);
void log_redirect_stderr_to(const char *);
diff --git a/monitor.c b/monitor.c
index 7461fae..da2f766 100644
--- a/monitor.c
+++ b/monitor.c
@@ -364,6 +364,8 @@ monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
close(pmonitor->m_log_sendfd);
pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
+ pmonitor->m_state = "preauth";
+
authctxt = _authctxt;
memset(authctxt, 0, sizeof(*authctxt));
@@ -472,6 +474,8 @@ monitor_child_postauth(struct monitor *pmonitor)
close(pmonitor->m_recvfd);
pmonitor->m_recvfd = -1;
+ pmonitor->m_state = "postauth";
+
monitor_set_child_handler(pmonitor->m_pid);
signal(SIGHUP, &monitor_child_handler);
signal(SIGTERM, &monitor_child_handler);
@@ -552,7 +556,7 @@ monitor_read_log(struct monitor *pmonitor)
if (log_level_name(level) == NULL)
fatal("%s: invalid log level %u (corrupted message?)",
__func__, level);
- do_log2(level, "%s [preauth]", msg);
+ do_log2(level, "%s [%s]", msg, pmonitor->m_state);
buffer_free(&logmsg);
free(msg);
@@ -2083,13 +2087,28 @@ monitor_init(void)
mm_init_compression(mon->m_zlib);
}
+ mon->m_state = "";
+
return mon;
}
void
-monitor_reinit(struct monitor *mon)
+monitor_reinit(struct monitor *mon, const char *chroot_dir)
{
- monitor_openfds(mon, 0);
+ struct stat dev_log_stat;
+ char *dev_log_path;
+ int do_logfds = 0;
+
+ if (chroot_dir != NULL) {
+ xasprintf(&dev_log_path, "%s/dev/log", chroot_dir);
+
+ if (stat(dev_log_path, &dev_log_stat) != 0) {
+ debug("%s: /dev/log doesn't exist in %s chroot - will try to log via monitor using [postauth] suffix", __func__, chroot_dir);
+ do_logfds = 1;
+ }
+ free(dev_log_path);
+ }
+ monitor_openfds(mon, do_logfds);
}
#ifdef GSSAPI
diff --git a/monitor.h b/monitor.h
index ff79fbb..00c2028 100644
--- a/monitor.h
+++ b/monitor.h
@@ -83,10 +83,11 @@ struct monitor {
struct mm_master *m_zlib;
struct Kex **m_pkex;
pid_t m_pid;
+ char *m_state;
};
struct monitor *monitor_init(void);
-void monitor_reinit(struct monitor *);
+void monitor_reinit(struct monitor *, const char *);
void monitor_sync(struct monitor *);
struct Authctxt;
diff --git a/session.c b/session.c
index e4add93..bc4a8dd 100644
--- a/session.c
+++ b/session.c
@@ -160,6 +160,8 @@ login_cap_t *lc;
static int is_child = 0;
+static int have_dev_log = 1;
+
/* Name and directory of socket for authentication agent forwarding. */
static char *auth_sock_name = NULL;
static char *auth_sock_dir = NULL;
@@ -523,8 +525,8 @@ do_exec_no_pty(Session *s, const char *command)
is_child = 1;
/* Child. Reinitialize the log since the pid has changed. */
- log_init(__progname, options.log_level,
- options.log_facility, log_stderr);
+ log_init_handler(__progname, options.log_level,
+ options.log_facility, log_stderr, have_dev_log);
/*
* Create a new session and process group since the 4.4BSD
@@ -692,8 +694,8 @@ do_exec_pty(Session *s, const char *command)
close(ptymaster);
/* Child. Reinitialize the log because the pid has changed. */
- log_init(__progname, options.log_level,
- options.log_facility, log_stderr);
+ log_init_handler(__progname, options.log_level,
+ options.log_facility, log_stderr, have_dev_log);
/* Close the master side of the pseudo tty. */
close(ptyfd);
@@ -797,6 +799,7 @@ do_exec(Session *s, const char *command)
int ret;
const char *forced = NULL;
char session_type[1024], *tty = NULL;
+ struct stat dev_log_stat;
if (options.adm_forced_command) {
original_command = command;
@@ -854,6 +857,10 @@ do_exec(Session *s, const char *command)
tty += 5;
}
+ if (lstat("/dev/log", &dev_log_stat) != 0) {
+ have_dev_log = 0;
+ }
+
verbose("Starting session: %s%s%s for %s from %.200s port %d",
session_type,
tty == NULL ? "" : " on ",
@@ -1681,14 +1688,6 @@ child_close_fds(void)
* descriptors left by system functions. They will be closed later.
*/
endpwent();
-
- /*
- * Close any extra open file descriptors so that we don't have them
- * hanging around in clients. Note that we want to do this after
- * initgroups, because at least on Solaris 2.3 it leaves file
- * descriptors open.
- */
- closefrom(STDERR_FILENO + 1);
}
/*
@@ -1834,8 +1833,6 @@ do_child(Session *s, const char *command)
exit(1);
}
- closefrom(STDERR_FILENO + 1);
-
if (!options.use_login)
do_rc_files(s, shell);
@@ -1859,9 +1856,17 @@ do_child(Session *s, const char *command)
argv[i] = NULL;
optind = optreset = 1;
__progname = argv[0];
- exit(sftp_server_main(i, argv, s->pw));
+ exit(sftp_server_main(i, argv, s->pw, have_dev_log));
}
+ /*
+ * Close any extra open file descriptors so that we don't have them
+ * hanging around in clients. Note that we want to do this after
+ * initgroups, because at least on Solaris 2.3 it leaves file
+ * descriptors open.
+ */
+ closefrom(STDERR_FILENO + 1);
+
fflush(NULL);
if (options.use_login) {
diff --git a/sftp-server-main.c b/sftp-server-main.c
index 7e644ab..e162b7a 100644
--- a/sftp-server-main.c
+++ b/sftp-server-main.c
@@ -47,5 +47,5 @@ main(int argc, char **argv)
return 1;
}
- return (sftp_server_main(argc, argv, user_pw));
+ return (sftp_server_main(argc, argv, user_pw, 0));
}
diff --git a/sftp-server.c b/sftp-server.c
index b8eb59c..a0e644c 100644
--- a/sftp-server.c
+++ b/sftp-server.c
@@ -1437,7 +1437,7 @@ sftp_server_usage(void)
}
int
-sftp_server_main(int argc, char **argv, struct passwd *user_pw)
+sftp_server_main(int argc, char **argv, struct passwd *user_pw, int reset_handler)
{
fd_set *rset, *wset;
int i, in, out, max, ch, skipargs = 0, log_stderr = 0;
@@ -1450,7 +1450,7 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
extern char *__progname;
__progname = ssh_get_progname(argv[0]);
- log_init(__progname, log_level, log_facility, log_stderr);
+ log_init_handler(__progname, log_level, log_facility, log_stderr, reset_handler);
pw = pwcopy(user_pw);
@@ -1521,7 +1521,7 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
}
}
- log_init(__progname, log_level, log_facility, log_stderr);
+ log_init_handler(__progname, log_level, log_facility, log_stderr, reset_handler);
if ((cp = getenv("SSH_CONNECTION")) != NULL) {
client_addr = xstrdup(cp);
diff --git a/sftp.h b/sftp.h
index 2bde8bb..ddf1a39 100644
--- a/sftp.h
+++ b/sftp.h
@@ -97,5 +97,5 @@
struct passwd;
-int sftp_server_main(int, char **, struct passwd *);
+int sftp_server_main(int, char **, struct passwd *, int);
void sftp_server_cleanup_exit(int) __attribute__((noreturn));
diff --git a/sshd.c b/sshd.c
index 3eee75a..9c00bcb 100644
--- a/sshd.c
+++ b/sshd.c
@@ -745,7 +745,7 @@ privsep_postauth(Authctxt *authctxt)
}
/* New socket pair */
- monitor_reinit(pmonitor);
+ monitor_reinit(pmonitor, options.chroot_directory);
pmonitor->m_pid = fork();
if (pmonitor->m_pid == -1)
@@ -763,6 +763,11 @@ privsep_postauth(Authctxt *authctxt)
close(pmonitor->m_sendfd);
pmonitor->m_sendfd = -1;
+ close(pmonitor->m_log_recvfd);
+ pmonitor->m_log_recvfd = -1;
+
+ if (pmonitor->m_log_sendfd != -1)
+ set_log_handler(mm_log_handler, pmonitor);
/* Demote the private keys to public keys. */
demote_sensitive_data();

3
openssh.spec
View File

@ -214,6 +214,8 @@ Patch915: openssh-6.6.1p1-ignore-SIGXFSZ-in-postauth.patch
Patch916: openssh-6.6.1p1-selinux-contexts.patch
# use different values for DH for Cisco servers (#1026430)
Patch917: openssh-6.6.1p1-cisco-dh-keys.patch
# log via monitor in chroots without /dev/log
Patch918: openssh-6.6.1p1-log-in-chroot.patch
License: BSD
Group: Applications/Internet
@ -424,6 +426,7 @@ popd
%patch915 -p1 -b .SIGXFSZ
%patch916 -p1 -b .contexts
%patch917 -p1 -b .cisco-dh
%patch918 -p1 -b .log-in-chroot
%patch200 -p1 -b .audit
%patch201 -p1 -b .audit-fps