*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.126 2002/02/14 23:28:00 markus Exp $");
+RCSID("$OpenBSD: session.c,v 1.127 2002/02/15 23:11:26 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
original_command = NULL;
}
+
/* administrative, login(1)-like work */
void
do_login(Session *s, const char *command)
if (packet_connection_is_on_socket()) {
fromlen = sizeof(from);
if (getpeername(packet_get_connection_in(),
- (struct sockaddr *) & from, &fromlen) < 0) {
+ (struct sockaddr *) & from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
fatal_cleanup();
}
}
}
-/*
- * Performs common processing for the child, such as setting up the
- * environment, closing extra file descriptors, setting the user and group
- * ids, and executing the command or shell.
- */
-void
-do_child(Session *s, const char *command)
+static char **
+do_setup_env(Session *s, const char *shell)
{
- const char *shell, *hostname = NULL, *cp = NULL;
- struct passwd *pw = s->pw;
char buf[256];
- char cmd[1024];
- FILE *f = NULL;
- u_int envsize, i;
+ u_int i, envsize;
char **env;
- extern char **environ;
- struct stat st;
- char *argv[10];
- int do_xauth;
-
- do_xauth =
- s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
-
- /* remove hostkey from the child's memory */
- destroy_sensitive_data();
-
- /* login(1) is only called if we execute the login shell */
- if (options.use_login && command != NULL)
- options.use_login = 0;
-
-#if !defined(HAVE_OSF_SIA)
- 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 /* HAVE_OSF_SIA */
-
- /* 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
- session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
- if (!check_quietlogin(s, command))
- do_motd();
-#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 defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
- /* Sets login uid for accounting */
- if (getluid() == -1 && setluid(pw->pw_uid) == -1)
- error("setluid: %s", strerror(errno));
-#endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
-
- if (setlogin(pw->pw_name) < 0)
- error("setlogin failed: %s", strerror(errno));
- if (setgid(pw->pw_gid) < 0) {
- perror("setgid");
- exit(1);
- }
- /* Initialize the group list. */
- if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
- perror("initgroups");
- exit(1);
- }
- endgrent();
-# ifdef USE_PAM
- /*
- * PAM credentials may take the form of
- * supplementary groups. These will have been
- * wiped by the above initgroups() call.
- * Reestablish them here.
- */
- do_pam_setcred(0);
-# endif /* USE_PAM */
-# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
- irix_setusercontext(pw);
-# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
-#ifdef _AIX
- aix_usrinfo(s)
-#endif
-
- /* Permanently switch to the desired uid. */
- permanently_set_uid(pw);
-# 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 %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
+ struct passwd *pw = s->pw;
/* Initialize the environment. */
envsize = 100;
while (custom_environment) {
struct envstring *ce = custom_environment;
char *s = ce->s;
- int i;
+
for (i = 0; s[i] != '=' && s[i]; i++)
;
if (s[i] == '=') {
}
snprintf(buf, sizeof buf, "%.50s %d %d",
- get_remote_ipaddr(), get_remote_port(), get_local_port());
+ get_remote_ipaddr(), get_remote_port(), get_local_port());
child_set_env(&env, &envsize, "SSH_CLIENT", buf);
if (s->ttyfd != -1)
for (i = 0; env[i]; i++)
fprintf(stderr, " %.200s\n", env[i]);
}
+ return env;
+}
+
+/*
+ * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
+ * first in this order).
+ */
+static void
+do_rc_files(Session *s, const char *shell)
+{
+ FILE *f = NULL;
+ char cmd[1024];
+ int do_xauth;
+ struct stat st;
+
+ do_xauth =
+ s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
+
+ /* ignore _PATH_SSH_USER_RC for subsystems */
+ if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
+ snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
+ shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
+ if (debug_flag)
+ fprintf(stderr, "Running %s\n", cmd);
+ f = popen(cmd, "w");
+ if (f) {
+ if (do_xauth)
+ fprintf(f, "%s %s\n", s->auth_proto,
+ s->auth_data);
+ pclose(f);
+ } else
+ fprintf(stderr, "Could not run %s\n",
+ _PATH_SSH_USER_RC);
+ } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
+ if (debug_flag)
+ fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
+ _PATH_SSH_SYSTEM_RC);
+ f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
+ if (f) {
+ if (do_xauth)
+ fprintf(f, "%s %s\n", s->auth_proto,
+ s->auth_data);
+ pclose(f);
+ } else
+ fprintf(stderr, "Could not run %s\n",
+ _PATH_SSH_SYSTEM_RC);
+ } else if (do_xauth && options.xauth_location != NULL) {
+ /* Add authority data to .Xauthority if appropriate. */
+ if (debug_flag) {
+ fprintf(stderr,
+ "Running %.100s add "
+ "%.100s %.100s %.100s\n",
+ options.xauth_location, s->auth_display,
+ s->auth_proto, s->auth_data);
+ }
+ snprintf(cmd, sizeof cmd, "%s -q -",
+ options.xauth_location);
+ f = popen(cmd, "w");
+ if (f) {
+ fprintf(f, "add %s %s %s\n",
+ s->auth_display, s->auth_proto,
+ s->auth_data);
+ pclose(f);
+ } else {
+ fprintf(stderr, "Could not run %s\n",
+ cmd);
+ }
+ }
+}
+
+static void
+do_nologin(struct passwd *pw)
+{
+ FILE *f = NULL;
+ char buf[1024];
+
+#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
+ if (pw->pw_uid)
+ f = fopen(_PATH_NOLOGIN, "r");
+#endif
+ if (f) {
+ /* /etc/nologin exists. Print its contents and exit. */
+ while (fgets(buf, sizeof(buf), f))
+ fputs(buf, stderr);
+ fclose(f);
+ exit(254);
+ }
+}
+
+/* Set login name, uid, gid, and groups. */
+static void
+do_setusercontext(struct passwd *pw)
+{
+#ifdef HAVE_CYGWIN
+ if (iswinnt) {
+#else /* HAVE_CYGWIN */
+ if (getuid() == 0 || geteuid() == 0) {
+#endif /* HAVE_CYGWIN */
+#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
+# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
+ /* Sets login uid for accounting */
+ if (getluid() == -1 && setluid(pw->pw_uid) == -1)
+ error("setluid: %s", strerror(errno));
+# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
+
+ if (setlogin(pw->pw_name) < 0)
+ error("setlogin failed: %s", strerror(errno));
+ if (setgid(pw->pw_gid) < 0) {
+ perror("setgid");
+ exit(1);
+ }
+ /* Initialize the group list. */
+ if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
+ perror("initgroups");
+ exit(1);
+ }
+ endgrent();
+# ifdef USE_PAM
+ /*
+ * PAM credentials may take the form of supplementary groups.
+ * These will have been wiped by the above initgroups() call.
+ * Reestablish them here.
+ */
+ do_pam_setcred(0);
+# endif /* USE_PAM */
+# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
+ irix_setusercontext(pw);
+# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
+#ifdef _AIX
+ aix_usrinfo(s)
+#endif
+ /* Permanently switch to the desired uid. */
+ permanently_set_uid(pw);
+#endif
+ }
+ if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
+ fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
+}
+
+/*
+ * Performs common processing for the child, such as setting up the
+ * environment, closing extra file descriptors, setting the user and group
+ * ids, and executing the command or shell.
+ */
+void
+do_child(Session *s, const char *command)
+{
+ extern char **environ;
+ char **env;
+ char *argv[10];
+ const char *shell, *shell0, *hostname = NULL;
+ struct passwd *pw = s->pw;
+ u_int i;
+
+ /* remove hostkey from the child's memory */
+ destroy_sensitive_data();
+
+ /* login(1) is only called if we execute the login shell */
+ if (options.use_login && command != NULL)
+ options.use_login = 0;
+
+ /*
+ * 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
+ session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
+ if (!check_quietlogin(s, command))
+ do_motd();
+#else /* HAVE_OSF_SIA */
+ do_nologin(pw);
+ do_setusercontext(pw);
+#endif /* HAVE_OSF_SIA */
+ }
+
+ /*
+ * 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
+
+ env = do_setup_env(s, shell);
+
/* we have to stash the hostname before we close our socket. */
if (options.use_login)
hostname = get_remote_name_or_ip(utmp_len,
#endif
}
- /*
- * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
- * first in this order).
- */
- if (!options.use_login) {
- /* ignore _PATH_SSH_USER_RC for subsystems */
- if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
- snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
- shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
- if (debug_flag)
- fprintf(stderr, "Running %s\n", cmd);
- f = popen(cmd, "w");
- if (f) {
- if (do_xauth)
- fprintf(f, "%s %s\n", s->auth_proto,
- s->auth_data);
- pclose(f);
- } else
- fprintf(stderr, "Could not run %s\n",
- _PATH_SSH_USER_RC);
- } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
- if (debug_flag)
- fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
- _PATH_SSH_SYSTEM_RC);
- f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
- if (f) {
- if (do_xauth)
- fprintf(f, "%s %s\n", s->auth_proto,
- s->auth_data);
- pclose(f);
- } else
- fprintf(stderr, "Could not run %s\n",
- _PATH_SSH_SYSTEM_RC);
- } else if (do_xauth && options.xauth_location != NULL) {
- /* Add authority data to .Xauthority if appropriate. */
- if (debug_flag) {
- fprintf(stderr,
- "Running %.100s add "
- "%.100s %.100s %.100s\n",
- options.xauth_location, s->auth_display,
- s->auth_proto, s->auth_data);
- }
- snprintf(cmd, sizeof cmd, "%s -q -",
- options.xauth_location);
- f = popen(cmd, "w");
- if (f) {
- fprintf(f, "add %s %s %s\n",
- s->auth_display, s->auth_proto,
- s->auth_data);
- pclose(f);
- } else {
- fprintf(stderr, "Could not run %s\n",
- cmd);
- }
- }
- /* Get the last component of the shell name. */
- cp = strrchr(shell, '/');
- if (cp)
- cp++;
- else
- cp = shell;
- }
+ if (!options.use_login)
+ do_rc_files(s, shell);
/* restore SIGPIPE for child */
signal(SIGPIPE, SIG_DFL);
+ if (options.use_login) {
+ /* Launch login(1). */
+
+ execl(LOGIN_PROGRAM, "login", "-h", hostname,
+#ifdef LOGIN_NEEDS_TERM
+ (s->term ? s->term : "unknown"),
+#endif /* LOGIN_NEEDS_TERM */
+ "-p", "-f", "--", pw->pw_name, (char *)NULL);
+
+ /* Login couldn't be executed, die. */
+
+ perror("login");
+ exit(1);
+ }
+
+ /* Get the last component of the shell name. */
+ if ((shell0 = strrchr(shell, '/')) != NULL)
+ shell0++;
+ else
+ shell0 = shell;
+
/*
* If we have no command, execute the shell. In this case, the shell
* name to be passed in argv[0] is preceded by '-' to indicate that
* this is a login shell.
*/
if (!command) {
- if (!options.use_login) {
- char buf[256];
+ char argv0[256];
- /* Start the shell. Set initial character to '-'. */
- buf[0] = '-';
- strlcpy(buf + 1, cp, sizeof(buf) - 1);
+ /* Start the shell. Set initial character to '-'. */
+ argv0[0] = '-';
- /* Execute the shell. */
- argv[0] = buf;
- argv[1] = NULL;
- execve(shell, argv, env);
-
- /* Executing the shell failed. */
+ if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
+ >= sizeof(argv0) - 1) {
+ errno = EINVAL;
perror(shell);
exit(1);
+ }
- } else {
- /* Launch login(1). */
-
- execl(LOGIN_PROGRAM, "login", "-h", hostname,
-#ifdef LOGIN_NEEDS_TERM
- s->term? s->term : "unknown",
-#endif
- "-p", "-f", "--", pw->pw_name, (char *)NULL);
-
- /* Login couldn't be executed, die. */
+ /* Execute the shell. */
+ argv[0] = argv0;
+ argv[1] = NULL;
+ execve(shell, argv, env);
- perror("login");
- exit(1);
- }
+ /* Executing the shell failed. */
+ perror(shell);
+ exit(1);
}
/*
* Execute the command using the user's shell. This uses the -c
* option to execute the command.
*/
- argv[0] = (char *) cp;
+ argv[0] = (char *) shell0;
argv[1] = "-c";
argv[2] = (char *) command;
argv[3] = NULL;
andersk / openssh.git / commitdiff
