/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- */
-/*
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
* SSH2 support by Markus Friedl.
* Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.12 2000/05/03 18:03:07 markus Exp $");
+RCSID("$OpenBSD: session.c,v 1.40 2000/10/15 14:14:01 markus Exp $");
#include "xmalloc.h"
#include "ssh.h"
#include "pty.h"
#include "packet.h"
#include "buffer.h"
-#include "cipher.h"
#include "mpaux.h"
#include "servconf.h"
#include "uidswap.h"
#include "bufaux.h"
#include "ssh2.h"
#include "auth.h"
+#include "auth-options.h"
+
+#ifdef WITH_IRIX_PROJECT
+#include <proj.h>
+#endif /* WITH_IRIX_PROJECT */
+
+#if defined(HAVE_USERSEC_H)
+#include <usersec.h>
+#endif
+
+#ifdef HAVE_OSF_SIA
+# include <sia.h>
+# include <siad.h>
+#endif
+
+#ifdef HAVE_CYGWIN
+#include <windows.h>
+#include <sys/cygwin.h>
+#define is_winnt (GetVersion() < 0x80000000)
+#endif
+
+/* AIX limits */
+#if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
+# define S_UFSIZE_HARD S_UFSIZE "_hard"
+# define S_UCPU_HARD S_UCPU "_hard"
+# define S_UDATA_HARD S_UDATA "_hard"
+# define S_USTACK_HARD S_USTACK "_hard"
+# define S_URSS_HARD S_URSS "_hard"
+# define S_UCORE_HARD S_UCORE "_hard"
+# define S_UNOFILE_HARD S_UNOFILE "_hard"
+#endif
+
+#ifdef HAVE_LOGIN_CAP
+#include <login_cap.h>
+#endif
/* types */
void session_proctitle(Session *s);
void do_exec_pty(Session *s, const char *command, struct passwd * pw);
void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
+void do_login(Session *s);
void
do_child(const char *command, struct passwd * pw, const char *term,
extern int log_stderr;
extern int debug_flag;
+extern unsigned int utmp_len;
+
+extern int startup_pipe;
/* Local Xauthority file. */
static char *xauthfile;
+/* original command from peer. */
+char *original_command = NULL;
+
/* data */
#define MAX_SESSIONS 10
Session sessions[MAX_SESSIONS];
+
#ifdef WITH_AIXAUTHENTICATE
/* AIX's lastlogin message, set in auth1.c */
char *aixloginmsg;
#endif /* WITH_AIXAUTHENTICATE */
-/* Flags set in auth-rsa from authorized_keys flags. These are set in auth-rsa.c. */
-int no_port_forwarding_flag = 0;
-int no_agent_forwarding_flag = 0;
-int no_x11_forwarding_flag = 0;
-int no_pty_flag = 0;
-
-/* RSA authentication "command=" option. */
-char *forced_command = NULL;
-
-/* RSA authentication "environment=" options. */
-struct envstring *custom_environment = NULL;
+#ifdef HAVE_LOGIN_CAP
+static login_cap_t *lc;
+#endif
/*
* Remove local Xauthority file.
do_authenticated(struct passwd * pw)
{
Session *s;
- int type;
+ int type, fd;
int compression_level = 0, enable_compression_after_reply = 0;
int have_pty = 0;
char *command;
* authentication.
*/
alarm(0);
+ if (startup_pipe != -1) {
+ close(startup_pipe);
+ startup_pipe = -1;
+ }
/*
* Inform the channel mechanism that we are the server side and that
* by the client telling us, so we can equally well trust the client
* not to request anything bogus.)
*/
- if (!no_port_forwarding_flag)
+ if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
channel_permit_all_opens();
s = session_new();
s->pw = pw;
+#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
+ if ((lc = login_getclass(pw->pw_class)) == NULL) {
+ error("unable to get login class");
+ return;
+ }
+#endif
+
/*
* We stay in this loop until the client requests to execute a shell
* or a command.
packet_send_debug("X11 forwarding disabled in server configuration file.");
break;
}
-#ifdef XAUTH_PATH
+ if (!options.xauth_location) {
+ packet_send_debug("No xauth program; cannot forward with spoofing.");
+ break;
+ }
if (no_x11_forwarding_flag) {
packet_send_debug("X11 forwarding not permitted for this authentication.");
break;
break;
}
strlcat(xauthfile, "/cookies", MAXPATHLEN);
- open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (fd >= 0)
+ close(fd);
restore_uid();
fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
success = 1;
break;
-#else /* XAUTH_PATH */
- packet_send_debug("No xauth program; cannot forward with spoofing.");
- break;
-#endif /* XAUTH_PATH */
case SSH_CMSG_AGENT_REQUEST_FORWARDING:
if (no_agent_forwarding_flag || compat13) {
break;
}
debug("Received authentication agent forwarding request.");
- auth_input_request_forwarding(pw);
- success = 1;
+ success = auth_input_request_forwarding(pw);
break;
case SSH_CMSG_PORT_FORWARD_REQUEST:
debug("Port forwarding not permitted for this authentication.");
break;
}
+ if (!options.allow_tcp_forwarding) {
+ debug("Port forwarding not permitted.");
+ break;
+ }
debug("Received TCP/IP port forwarding request.");
channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
success = 1;
packet_integrity_check(plen, 0, type);
}
if (forced_command != NULL) {
+ original_command = command;
command = forced_command;
debug("Forced command '%.500s'", forced_command);
}
if (s == NULL)
fatal("do_exec_no_pty: no session");
+ signal(SIGPIPE, SIG_DFL);
+
session_proctitle(s);
#ifdef USE_PAM
do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
/* NOTREACHED */
}
+#ifdef HAVE_CYGWIN
+ if (is_winnt)
+ cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
+#endif
if (pid < 0)
packet_disconnect("fork failed: %.100s", strerror(errno));
s->pid = pid;
void
do_exec_pty(Session *s, const char *command, struct passwd * pw)
{
- FILE *f;
- char buf[100], *time_string;
- char line[256];
- const char *hostname;
int fdout, ptyfd, ttyfd, ptymaster;
- int quiet_login;
pid_t pid;
- socklen_t fromlen;
- struct sockaddr_storage from;
- struct stat st;
- time_t last_login_time;
if (s == NULL)
fatal("do_exec_pty: no session");
ptyfd = s->ptyfd;
ttyfd = s->ttyfd;
- /* Get remote host name. */
- hostname = get_canonical_hostname();
-
- /*
- * Get the time when the user last logged in. Buf will be set to
- * contain the hostname the last login was from.
- */
- if (!options.use_login) {
- last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
- buf, sizeof(buf));
- }
-
#ifdef USE_PAM
do_pam_session(pw->pw_name, s->tty);
do_pam_setcred();
/* Fork the child. */
if ((pid = fork()) == 0) {
- pid = getpid();
-
- /* Child. Reinitialize the log because the pid has
- changed. */
+ /* Child. Reinitialize the log because the pid has changed. */
log_init(__progname, options.log_level, options.log_facility, log_stderr);
/* Close the master side of the pseudo tty. */
/* Close the extra descriptor for the pseudo tty. */
close(ttyfd);
-/* XXXX ? move to do_child() ??*/
- /*
- * Get IP address of client. This is needed because we want
- * to record where the user logged in from. If the
- * connection is not a socket, let the ip address be 0.0.0.0.
- */
- memset(&from, 0, sizeof(from));
- if (packet_connection_is_on_socket()) {
- fromlen = sizeof(from);
- if (getpeername(packet_get_connection_in(),
- (struct sockaddr *) & from, &fromlen) < 0) {
- debug("getpeername: %.100s", strerror(errno));
- fatal_cleanup();
- }
- }
- /* Record that there was a login on that terminal. */
- record_login(pid, s->tty, pw->pw_name, pw->pw_uid, hostname,
- (struct sockaddr *)&from);
-
- /* Check if .hushlogin exists. */
- snprintf(line, sizeof line, "%.200s/.hushlogin", pw->pw_dir);
- quiet_login = stat(line, &st) >= 0;
+ /* record login, etc. similar to login(1) */
+ if (command == NULL && !options.use_login)
+ do_login(s);
-#ifdef USE_PAM
- if (!quiet_login)
- print_pam_messages();
-#endif /* USE_PAM */
-
- /*
- * If the user has logged in before, display the time of last
- * login. However, don't display anything extra if a command
- * has been specified (so that ssh can be used to execute
- * commands on a remote machine without users knowing they
- * are going to another machine). Login(1) will do this for
- * us as well, so check if login(1) is used
- */
- if (command == NULL && last_login_time != 0 && !quiet_login &&
- !options.use_login) {
- /* Convert the date to a string. */
- time_string = ctime(&last_login_time);
- /* Remove the trailing newline. */
- if (strchr(time_string, '\n'))
- *strchr(time_string, '\n') = 0;
- /* Display the last login time. Host if displayed
- if known. */
- if (strcmp(buf, "") == 0)
- printf("Last login: %s\r\n", time_string);
- else
- printf("Last login: %s from %s\r\n", time_string, buf);
- }
- /*
- * Print /etc/motd unless a command was specified or printing
- * it was disabled in server options or login(1) will be
- * used. Note that some machines appear to print it in
- * /etc/profile or similar.
- */
- if (command == NULL && options.print_motd && !quiet_login &&
- !options.use_login) {
- /* Print /etc/motd if it exists. */
- f = fopen("/etc/motd", "r");
- if (f) {
- while (fgets(line, sizeof(line), f))
- fputs(line, stdout);
- fclose(f);
- }
- }
-#if defined(WITH_AIXAUTHENTICATE)
- /*
- * AIX handles the lastlog info differently. Display it here.
- */
- if (command == NULL && aixloginmsg && *aixloginmsg &&
- !quiet_login && !options.use_login) {
- printf("%s\n", aixloginmsg);
- }
-#endif
/* Do common processing for the child, such as execing the command. */
- do_child(command, pw, s->term, s->display, s->auth_proto, s->auth_data, s->tty);
+ do_child(command, pw, s->term, s->display, s->auth_proto,
+ s->auth_data, s->tty);
/* NOTREACHED */
}
+#ifdef HAVE_CYGWIN
+ if (is_winnt)
+ cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
+#endif
if (pid < 0)
packet_disconnect("fork failed: %.100s", strerror(errno));
s->pid = pid;
}
}
+const char *
+get_remote_name_or_ip(void)
+{
+ static const char *remote = "";
+ if (utmp_len > 0)
+ remote = get_canonical_hostname();
+ if (utmp_len == 0 || strlen(remote) > utmp_len)
+ remote = get_remote_ipaddr();
+ return remote;
+}
+
+/* administrative, login(1)-like work */
+void
+do_login(Session *s)
+{
+ FILE *f;
+ char *time_string;
+ char buf[256];
+ char hostname[MAXHOSTNAMELEN];
+ socklen_t fromlen;
+ struct sockaddr_storage from;
+ struct stat st;
+ time_t last_login_time;
+ struct passwd * pw = s->pw;
+ pid_t pid = getpid();
+
+ /*
+ * Get IP address of client. If the connection is not a socket, let
+ * the address be 0.0.0.0.
+ */
+ memset(&from, 0, sizeof(from));
+ if (packet_connection_is_on_socket()) {
+ fromlen = sizeof(from);
+ if (getpeername(packet_get_connection_in(),
+ (struct sockaddr *) & from, &fromlen) < 0) {
+ debug("getpeername: %.100s", strerror(errno));
+ fatal_cleanup();
+ }
+ }
+
+ /* Get the time and hostname when the user last logged in. */
+ hostname[0] = '\0';
+ last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
+ hostname, sizeof(hostname));
+
+ /* Record that there was a login on that tty from the remote host. */
+ record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
+ get_remote_name_or_ip(), (struct sockaddr *)&from);
+
+#ifdef USE_PAM
+ /*
+ * If password change is needed, do it now.
+ * This needs to occur before the ~/.hushlogin check.
+ */
+ if (pam_password_change_required()) {
+ print_pam_messages();
+ do_pam_chauthtok();
+ }
+#endif
+
+ /* Done if .hushlogin exists. */
+ snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
+#ifdef HAVE_LOGIN_CAP
+ if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
+#else
+ if (stat(buf, &st) >= 0)
+#endif
+ return;
+
+#ifdef USE_PAM
+ if (!pam_password_change_required())
+ print_pam_messages();
+#endif /* USE_PAM */
+#ifdef WITH_AIXAUTHENTICATE
+ if (aixloginmsg && *aixloginmsg)
+ printf("%s\n", aixloginmsg);
+#endif /* WITH_AIXAUTHENTICATE */
+
+ if (last_login_time != 0) {
+ time_string = ctime(&last_login_time);
+ if (strchr(time_string, '\n'))
+ *strchr(time_string, '\n') = 0;
+ if (strcmp(hostname, "") == 0)
+ printf("Last login: %s\r\n", time_string);
+ else
+ printf("Last login: %s from %s\r\n", time_string, hostname);
+ }
+ if (options.print_motd) {
+#ifdef HAVE_LOGIN_CAP
+ f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
+ "/etc/motd"), "r");
+#else
+ f = fopen("/etc/motd", "r");
+#endif
+ if (f) {
+ while (fgets(buf, sizeof(buf), f))
+ fputs(buf, stdout);
+ fclose(f);
+ }
+ }
+}
+
/*
* Sets the value of the given variable in the environment. If the variable
* already exists, its value is overriden.
fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
continue;
}
- /* Replace the equals sign by nul, and advance value to the value string. */
+ /*
+ * Replace the equals sign by nul, and advance value to
+ * the value string.
+ */
*value = '\0';
value++;
child_set_env(env, envsize, cp, value);
strncpy(var_name, pam_env[i], equals - pam_env[i]);
strcpy(var_val, equals + 1);
- debug("PAM environment: %s=%s", var_name, var_val);
+ debug3("PAM environment: %s=%s", var_name, var_val);
child_set_env(env, envsize, var_name, var_val);
}
}
#endif /* USE_PAM */
+
+#ifdef HAVE_CYGWIN
+void copy_environment(char ***env, int *envsize)
+{
+ char *equals, var_name[512], var_val[512];
+ int i;
+
+ for(i = 0; environ[i] != NULL; i++) {
+ if ((equals = strstr(environ[i], "=")) == NULL)
+ continue;
+
+ if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
+ memset(var_name, '\0', sizeof(var_name));
+ memset(var_val, '\0', sizeof(var_val));
+
+ strncpy(var_name, environ[i], equals - environ[i]);
+ strcpy(var_val, equals + 1);
+
+ debug3("Copy environment: %s=%s", var_name, var_val);
+
+ child_set_env(env, envsize, var_name, var_val);
+ }
+ }
+}
+#endif
+
+#if defined(HAVE_GETUSERATTR)
+/*
+ * AIX-specific login initialisation
+ */
+void set_limit(char *user, char *soft, char *hard, int resource, int mult)
+{
+ struct rlimit rlim;
+ int slim, hlim;
+
+ getrlimit(resource, &rlim);
+
+ slim = 0;
+ if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
+ if (slim < 0) {
+ rlim.rlim_cur = RLIM_INFINITY;
+ } else if (slim != 0) {
+ /* See the wackiness below */
+ if (rlim.rlim_cur == slim * mult)
+ slim = 0;
+ else
+ rlim.rlim_cur = slim * mult;
+ }
+ }
+
+ hlim = 0;
+ if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
+ if (hlim < 0) {
+ rlim.rlim_max = RLIM_INFINITY;
+ } else if (hlim != 0) {
+ rlim.rlim_max = hlim * mult;
+ }
+ }
+
+ /*
+ * XXX For cpu and fsize the soft limit is set to the hard limit
+ * if the hard limit is left at its default value and the soft limit
+ * is changed from its default value, either by requesting it
+ * (slim == 0) or by setting it to the current default. At least
+ * that's how rlogind does it. If you're confused you're not alone.
+ * Bug or feature? AIX 4.3.1.2
+ */
+ if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
+ && hlim == 0 && slim != 0)
+ rlim.rlim_max = rlim.rlim_cur;
+ /* A specified hard limit limits the soft limit */
+ else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
+ rlim.rlim_cur = rlim.rlim_max;
+ /* A soft limit can increase a hard limit */
+ else if (rlim.rlim_cur > rlim.rlim_max)
+ rlim.rlim_max = rlim.rlim_cur;
+
+ if (setrlimit(resource, &rlim) != 0)
+ error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
+}
+
+void set_limits_from_userattr(char *user)
+{
+ int mask;
+ char buf[16];
+
+ set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
+ set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
+ set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
+ set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
+ set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
+ set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
+#if defined(S_UNOFILE)
+ set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
+#endif
+
+ if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
+ /* Convert decimal to octal */
+ (void) snprintf(buf, sizeof(buf), "%d", mask);
+ if (sscanf(buf, "%o", &mask) == 1)
+ umask(mask);
+ }
+}
+#endif /* defined(HAVE_GETUSERATTR) */
+
/*
* Performs common processing for the child, such as setting up the
* environment, closing extra file descriptors, setting the user and group
const char *display, const char *auth_proto,
const char *auth_data, const char *ttyname)
{
- const char *shell, *cp = NULL;
+ const char *shell, *hostname = NULL, *cp = NULL;
char buf[256];
- FILE *f;
+ char cmd[1024];
+ FILE *f = NULL;
unsigned int envsize, i;
char **env;
extern char **environ;
struct stat st;
char *argv[10];
+#ifdef WITH_IRIX_PROJECT
+ prid_t projid;
+#endif /* WITH_IRIX_PROJECT */
+
+ /* login(1) is only called if we execute the login shell */
+ if (options.use_login && command != NULL)
+ options.use_login = 0;
#ifndef USE_PAM /* pam_nologin handles this */
- f = fopen("/etc/nologin", "r");
- if (f) {
- /* /etc/nologin exists. Print its contents and exit. */
- while (fgets(buf, sizeof(buf), f))
- fputs(buf, stderr);
- fclose(f);
- if (pw->pw_uid != 0)
+ if (!options.use_login) {
+# ifdef HAVE_LOGIN_CAP
+ if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
+ f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
+ _PATH_NOLOGIN), "r");
+# else /* HAVE_LOGIN_CAP */
+ if (pw->pw_uid)
+ f = fopen(_PATH_NOLOGIN, "r");
+# endif /* HAVE_LOGIN_CAP */
+ if (f) {
+ /* /etc/nologin exists. Print its contents and exit. */
+ while (fgets(buf, sizeof(buf), f))
+ fputs(buf, stderr);
+ fclose(f);
exit(254);
+ }
}
#endif /* USE_PAM */
- /* Set login name in the kernel. */
- if (setlogin(pw->pw_name) < 0)
- error("setlogin failed: %s", strerror(errno));
-
- /* Set uid, gid, and groups. */
+ /* Set login name, uid, gid, and groups. */
/* Login(1) does this as well, and it needs uid 0 for the "-h"
switch, so we let login(1) to this for us. */
if (!options.use_login) {
+#ifdef HAVE_OSF_SIA
+ extern char **saved_argv;
+ extern int saved_argc;
+ char *host = get_canonical_hostname ();
+
+ if (sia_become_user(NULL, saved_argc, saved_argv, host,
+ pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) !=
+ SIASUCCESS) {
+ perror("sia_become_user");
+ exit(1);
+ }
+ if (setreuid(geteuid(), geteuid()) < 0) {
+ perror("setreuid");
+ exit(1);
+ }
+#else /* HAVE_OSF_SIA */
+#ifdef HAVE_CYGWIN
+ if (is_winnt) {
+#else
if (getuid() == 0 || geteuid() == 0) {
+#endif
+# ifdef HAVE_GETUSERATTR
+ set_limits_from_userattr(pw->pw_name);
+# endif /* HAVE_GETUSERATTR */
+# ifdef HAVE_LOGIN_CAP
+ if (setusercontext(lc, pw, pw->pw_uid,
+ (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
+ perror("unable to set user context");
+ exit(1);
+ }
+# else /* HAVE_LOGIN_CAP */
+ if (setlogin(pw->pw_name) < 0)
+ error("setlogin failed: %s", strerror(errno));
if (setgid(pw->pw_gid) < 0) {
perror("setgid");
exit(1);
exit(1);
}
endgrent();
-
+# ifdef WITH_IRIX_ARRAY
+ /* initialize array session */
+ if (newarraysess() != 0)
+ fatal("Failed to set up new array session: %.100s",
+ strerror(errno));
+# endif /* WITH_IRIX_ARRAY */
+# ifdef WITH_IRIX_PROJECT
+ /* initialize irix project info */
+ if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
+ debug("Failed to get project id, using projid 0");
+ projid = 0;
+ }
+ if (setprid(projid))
+ fatal("Failed to initialize project %d for %s: %.100s",
+ (int)projid, pw->pw_name, strerror(errno));
+# endif /* WITH_IRIX_PROJECT */
/* Permanently switch to the desired uid. */
permanently_set_uid(pw->pw_uid);
+# endif /* HAVE_LOGIN_CAP */
}
+#endif /* HAVE_OSF_SIA */
+
+#ifdef HAVE_CYGWIN
+ if (is_winnt)
+#endif
if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
- fatal("Failed to set uids to %d.", (int) pw->pw_uid);
+ fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
}
/*
* Get the shell from the password data. An empty shell field is
* legal, and means /bin/sh.
*/
shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
+#ifdef HAVE_LOGIN_CAP
+ shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
+#endif
#ifdef AFS
/* Try to get AFS tokens for the local cell. */
env = xmalloc(envsize * sizeof(char *));
env[0] = NULL;
+#ifdef HAVE_CYGWIN
+ /*
+ * The Windows environment contains some setting which are
+ * important for a running system. They must not be dropped.
+ */
+ copy_environment(&env, &envsize);
+#endif
+
if (!options.use_login) {
/* Set basic environment. */
child_set_env(&env, &envsize, "USER", pw->pw_name);
child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
child_set_env(&env, &envsize, "HOME", pw->pw_dir);
+#ifdef HAVE_LOGIN_CAP
+ (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
+ child_set_env(&env, &envsize, "PATH", getenv("PATH"));
+#else /* HAVE_LOGIN_CAP */
+# ifndef HAVE_CYGWIN
+ /*
+ * There's no standard path on Windows. The path contains
+ * important components pointing to the system directories,
+ * needed for loading shared libraries. So the path better
+ * remains intact here.
+ */
child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
+# endif /* HAVE_CYGWIN */
+#endif /* HAVE_LOGIN_CAP */
snprintf(buf, sizeof buf, "%.200s/%.50s",
_PATH_MAILDIR, pw->pw_name);
child_set_env(&env, &envsize, "TERM", term);
if (display)
child_set_env(&env, &envsize, "DISPLAY", display);
+ if (original_command)
+ child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
+ original_command);
#ifdef _AIX
- {
- char *authstate,*krb5cc;
-
- if ((authstate = getenv("AUTHSTATE")) != NULL)
- child_set_env(&env,&envsize,"AUTHSTATE",authstate);
-
- if ((krb5cc = getenv("KRB5CCNAME")) != NULL)
- child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc);
- }
+ if ((cp = getenv("AUTHSTATE")) != NULL)
+ child_set_env(&env, &envsize, "AUTHSTATE", cp);
+ if ((cp = getenv("KRB5CCNAME")) != NULL)
+ child_set_env(&env, &envsize, "KRB5CCNAME", cp);
+ read_environment_file(&env, &envsize, "/etc/environment");
#endif
#ifdef KRB4
do_pam_environment(&env, &envsize);
#endif /* USE_PAM */
- read_environment_file(&env,&envsize,"/etc/environment");
-
if (xauthfile)
child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
if (auth_get_socket_name() != NULL)
/* read $HOME/.ssh/environment. */
if (!options.use_login) {
- snprintf(buf, sizeof buf, "%.200s/.ssh/environment", pw->pw_dir);
+ snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
+ pw->pw_dir);
read_environment_file(&env, &envsize, buf);
}
if (debug_flag) {
for (i = 0; env[i]; i++)
fprintf(stderr, " %.200s\n", env[i]);
}
+ /* we have to stash the hostname before we close our socket. */
+ if (options.use_login)
+ hostname = get_remote_name_or_ip();
/*
* Close the connection descriptors; note that this is the child, and
* the server will still have the socket open, and it is important
close(i);
/* Change current directory to the user\'s home directory. */
- if (chdir(pw->pw_dir) < 0)
+ if (chdir(pw->pw_dir) < 0) {
fprintf(stderr, "Could not chdir to home directory %s: %s\n",
pw->pw_dir, strerror(errno));
+#ifdef HAVE_LOGIN_CAP
+ if (login_getcapbool(lc, "requirehome", 0))
+ exit(1);
+#endif
+ }
/*
* Must take new environment into use so that .ssh/rc, /etc/sshrc and
if (!options.use_login) {
if (stat(SSH_USER_RC, &st) >= 0) {
if (debug_flag)
- fprintf(stderr, "Running /bin/sh %s\n", SSH_USER_RC);
+ fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC);
- f = popen("/bin/sh " SSH_USER_RC, "w");
+ f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
if (f) {
if (auth_proto != NULL && auth_data != NULL)
fprintf(f, "%s %s\n", auth_proto, auth_data);
fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
} else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
if (debug_flag)
- fprintf(stderr, "Running /bin/sh %s\n", SSH_SYSTEM_RC);
+ fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC);
- f = popen("/bin/sh " SSH_SYSTEM_RC, "w");
+ f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
if (f) {
if (auth_proto != NULL && auth_data != NULL)
fprintf(f, "%s %s\n", auth_proto, auth_data);
pclose(f);
} else
fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
- }
-#ifdef XAUTH_PATH
- else {
+ } else if (options.xauth_location != NULL) {
/* Add authority data to .Xauthority if appropriate. */
if (auth_proto != NULL && auth_data != NULL) {
- if (debug_flag)
- fprintf(stderr, "Running %.100s add %.100s %.100s %.100s\n",
- XAUTH_PATH, display, auth_proto, auth_data);
-
- f = popen(XAUTH_PATH " -q -", "w");
+ char *screen = strchr(display, ':');
+ if (debug_flag) {
+ fprintf(stderr,
+ "Running %.100s add %.100s %.100s %.100s\n",
+ options.xauth_location, display,
+ auth_proto, auth_data);
+#ifndef HAVE_CYGWIN /* Unix sockets are not supported */
+ if (screen != NULL)
+ fprintf(stderr,
+ "Adding %.*s/unix%s %s %s\n",
+ (int)(screen-display), display,
+ screen, auth_proto, auth_data);
+#endif
+ }
+ snprintf(cmd, sizeof cmd, "%s -q -",
+ options.xauth_location);
+ f = popen(cmd, "w");
if (f) {
- fprintf(f, "add %s %s %s\n", display, auth_proto, auth_data);
+ fprintf(f, "add %s %s %s\n", display,
+ auth_proto, auth_data);
+#ifndef HAVE_CYGWIN /* Unix sockets are not supported */
+ if (screen != NULL)
+ fprintf(f, "add %.*s/unix%s %s %s\n",
+ (int)(screen-display), display,
+ screen, auth_proto, auth_data);
+#endif
pclose(f);
- } else
- fprintf(stderr, "Could not run %s -q -\n", XAUTH_PATH);
+ } else {
+ fprintf(stderr, "Could not run %s\n",
+ cmd);
+ }
}
}
-#endif /* XAUTH_PATH */
-
/* Get the last component of the shell name. */
cp = strrchr(shell, '/');
if (cp)
struct stat mailstat;
mailbox = getenv("MAIL");
if (mailbox != NULL) {
- if (stat(mailbox, &mailstat) != 0 || mailstat.st_size == 0)
+ if (stat(mailbox, &mailstat) != 0 ||
+ mailstat.st_size == 0)
printf("No mail.\n");
else if (mailstat.st_mtime < mailstat.st_atime)
printf("You have mail.\n");
} else {
/* Launch login(1). */
- execl("/usr/bin/login", "login", "-h", get_remote_ipaddr(),
- "-p", "-f", "--", pw->pw_name, NULL);
+ execl(LOGIN_PROGRAM, "login", "-h", hostname,
+ "-p", "-f", "--", pw->pw_name, NULL);
/* Login couldn't be executed, die. */
unsigned int len;
char *term_modes; /* encoded terminal modes */
+ if (no_pty_flag)
+ return 0;
if (s->ttyfd != -1)
return 0;
s->term = packet_get_string(&len);
unsigned int len;
int success = 0;
char *subsys = packet_get_string(&len);
+ int i;
packet_done();
log("subsystem request for %s", subsys);
+ for (i = 0; i < options.num_subsystems; i++) {
+ if(strcmp(subsys, options.subsystem_name[i]) == 0) {
+ debug("subsystem: exec() %s", options.subsystem_command[i]);
+ do_exec_no_pty(s, options.subsystem_command[i], s->pw);
+ success = 1;
+ }
+ }
+
+ if (!success)
+ log("subsystem request for %s failed, subsystem not found", subsys);
+
xfree(subsys);
return success;
}
int
session_x11_req(Session *s)
{
+ int fd;
+ if (no_x11_forwarding_flag) {
+ debug("X11 forwarding disabled in user configuration file.");
+ return 0;
+ }
if (!options.x11_forwarding) {
debug("X11 forwarding disabled in server configuration file.");
return 0;
return 0;
}
strlcat(xauthfile, "/cookies", MAXPATHLEN);
- open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (fd >= 0)
+ close(fd);
restore_uid();
fatal_add_cleanup(xauthfile_cleanup_proc, s);
return 1;
}
+int
+session_shell_req(Session *s)
+{
+ /* if forced_command == NULL, the shell is execed */
+ char *shell = forced_command;
+ packet_done();
+ s->extended = 1;
+ if (s->ttyfd == -1)
+ do_exec_no_pty(s, shell, s->pw);
+ else
+ do_exec_pty(s, shell, s->pw);
+ return 1;
+}
+
+int
+session_exec_req(Session *s)
+{
+ unsigned int len;
+ char *command = packet_get_string(&len);
+ packet_done();
+ if (forced_command) {
+ original_command = command;
+ command = forced_command;
+ debug("Forced command '%.500s'", forced_command);
+ }
+ s->extended = 1;
+ if (s->ttyfd == -1)
+ do_exec_no_pty(s, command, s->pw);
+ else
+ do_exec_pty(s, command, s->pw);
+ if (forced_command == NULL)
+ xfree(command);
+ return 1;
+}
+
void
session_input_channel_req(int id, void *arg)
{
*/
if (c->type == SSH_CHANNEL_LARVAL) {
if (strcmp(rtype, "shell") == 0) {
- packet_done();
- s->extended = 1;
- if (s->ttyfd == -1)
- do_exec_no_pty(s, NULL, s->pw);
- else
- do_exec_pty(s, NULL, s->pw);
- success = 1;
+ success = session_shell_req(s);
} else if (strcmp(rtype, "exec") == 0) {
- char *command = packet_get_string(&len);
- packet_done();
- s->extended = 1;
- if (s->ttyfd == -1)
- do_exec_no_pty(s, command, s->pw);
- else
- do_exec_pty(s, command, s->pw);
- xfree(command);
- success = 1;
+ success = session_exec_req(s);
} else if (strcmp(rtype, "pty-req") == 0) {
success = session_pty_req(s);
} else if (strcmp(rtype, "x11-req") == 0) {
* interested in data we write.
* Note that we must not call 'chan_read_failed', since there could
* be some more data waiting in the pipe.
+ * djm - This is no longer true as we have allowed one pass through
+ * the select loop before killing the connection
*/
if (c->ostate != CHAN_OUTPUT_CLOSED)
chan_write_failed(c);
+ if (c->istate != CHAN_INPUT_CLOSED)
+ chan_read_failed(c);
s->chanid = -1;
}
session_close(s);
} else {
/* notify child, delay session cleanup */
+ if (s->pid <= 1)
+ fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid);
if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
error("session_close_by_channel: kill %d: %s",
s->pid, strerror(errno));
void
do_authenticated2(void)
{
+#ifdef HAVE_LOGIN_CAP
+ struct passwd *pw;
+#endif
+
/*
* Cancel the alarm we set to limit the time taken for
* authentication.
*/
alarm(0);
+ if (startup_pipe != -1) {
+ close(startup_pipe);
+ startup_pipe = -1;
+ }
+#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
+ pw = auth_get_user();
+ if ((lc = login_getclass(pw->pw_class)) == NULL) {
+ error("unable to get login class");
+ return;
+ }
+#endif
server_loop2();
if (xauthfile)
xauthfile_cleanup_proc(NULL);
andersk / openssh.git / blobdiff