*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.23 2000/07/11 08:11:33 deraadt Exp $");
+RCSID("$OpenBSD: session.c,v 1.35 2000/09/04 19:07:21 markus Exp $");
#include "xmalloc.h"
#include "ssh.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_UNOFILE_HARD S_UNOFILE "_hard"
#endif
+#ifdef HAVE_LOGIN_CAP
+#include <login_cap.h>
+#endif
+
/* types */
#define TTYSZ 64
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];
char *aixloginmsg;
#endif /* WITH_AIXAUTHENTICATE */
+#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;
s = session_new();
s->pw = pw;
+#ifdef HAVE_LOGIN_CAP
+ 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.
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;
packet_integrity_check(plen, 0, type);
}
if (forced_command != NULL) {
+ original_command = command;
command = forced_command;
debug("Forced command '%.500s'", forced_command);
}
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. */
- if (!options.use_login || command != NULL)
- 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;
-
-#ifdef USE_PAM
- if (!quiet_login)
- print_pam_messages();
-#endif /* USE_PAM */
+ /* record login, etc. similar to login(1) */
+ if (command == NULL && !options.use_login)
+ do_login(s);
- /*
- * 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);
/* 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. */
+ 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);
+
+ /* 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
+ 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(buf, "") == 0)
+ printf("Last login: %s\r\n", time_string);
+ else
+ printf("Last login: %s from %s\r\n", time_string, buf);
+ }
+ 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.
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];
char cmd[1024];
- FILE *f;
+ FILE *f = NULL;
unsigned int envsize, i;
char **env;
extern char **environ;
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 */
-#ifndef HAVE_OSF_SIA
- /* Set login name in the kernel. */
- if (setlogin(pw->pw_name) < 0)
- error("setlogin failed: %s", strerror(errno));
-#endif
-
- /* 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) {
exit(1);
}
#else /* HAVE_OSF_SIA */
+#ifdef HAVE_CYGWIN
+ if (is_winnt) {
+#else
if (getuid() == 0 || geteuid() == 0) {
-#if defined(HAVE_GETUSERATTR)
+#endif
+# ifdef HAVE_GETUSERATTR
set_limits_from_userattr(pw->pw_name);
-#endif /* defined(HAVE_GETUSERATTR) */
-
+# 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
+# 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
+# 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 */
-
+# endif /* WITH_IRIX_PROJECT */
/* Permanently switch to the desired uid. */
permanently_set_uid(pw->pw_uid);
+# endif /* HAVE_LOGIN_CAP */
}
- if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
- fatal("Failed to set uids to %d.", (int) pw->pw_uid);
#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
#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.
+ */
+ {
+ char **ep;
+ for (ep = environ; *ep; ++ep) {
+ char *esp = strchr(*ep, '=');
+ *esp = '\0';
+ child_set_env(&env, &envsize, *ep, esp + 1);
+ *esp = '=';
+ }
+ }
+#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
+#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
+#endif
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
{
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
"Running %.100s add %.100s %.100s %.100s\n",
options.xauth_location, display,
auth_proto, auth_data);
+#ifndef HAVE_CYGWIN
if (screen != NULL)
fprintf(stderr,
"Adding %.*s/unix%s %s %s\n",
- screen-display, display,
+ (int)(screen-display), display,
screen, auth_proto, auth_data);
+#endif
}
snprintf(cmd, sizeof cmd, "%s -q -",
options.xauth_location);
if (f) {
fprintf(f, "add %s %s %s\n", display,
auth_proto, auth_data);
+#ifndef HAVE_CYGWIN
if (screen != NULL)
fprintf(f, "add %.*s/unix%s %s %s\n",
- screen-display, display,
+ (int)(screen-display), display,
screen, auth_proto, auth_data);
+#endif
pclose(f);
} else {
fprintf(stderr, "Could not run %s\n",
} else {
/* Launch login(1). */
- execl(LOGIN_PROGRAM, "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. */
int
session_x11_req(Session *s)
{
+ int fd;
if (no_x11_forwarding_flag) {
debug("X11 forwarding disabled in user 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;
char *command = packet_get_string(&len);
packet_done();
if (forced_command) {
- xfree(command);
+ original_command = command;
command = forced_command;
debug("Forced command '%.500s'", forced_command);
}
void
do_authenticated2(void)
{
+#ifdef HAVE_LOGIN_CAP
+ struct passwd *pw;
+#endif
+
/*
* Cancel the alarm we set to limit the time taken for
* authentication.
close(startup_pipe);
startup_pipe = -1;
}
+#ifdef HAVE_LOGIN_CAP
+ 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