- (bal) OpenBSD CVS Sync
- markus@cvs.openbsd.org 2002/02/15 23:11:26 [session.c] split do_child(), ok mouring@ Compiles under Redhat 7.2.. I cannot give any promises.. but I spent a good hour and half ensure all the right bits are in the right spots.. and it does seem to help out quite a bit for readiblity.
This commit is contained in:
Ben Lindstrom
parent
a9c039cf04
commit
4e97e85c03
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@ -48,6 +48,11 @@
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- (bal) Migrated AIX getuserattr and usrinfo code to
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openbsd-compat/port-aix.[c] to improve readilbity of do_child() and
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simplify our diffs against upstream source.
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- (bal) OpenBSD CVS Sync
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- markus@cvs.openbsd.org 2002/02/15 23:11:26
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[session.c]
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split do_child(), ok mouring@
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20020218
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- (tim) newer config.guess from ftp://ftp.gnu.org/gnu/config/config.guess
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@ -7645,4 +7650,4 @@
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- Wrote replacements for strlcpy and mkdtemp
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- Released 1.0pre1
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$Id: ChangeLog,v 1.1867 2002/02/19 20:27:55 mouring Exp $
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$Id: ChangeLog,v 1.1868 2002/02/19 21:50:43 mouring Exp $
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465
session.c
465
session.c
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@ -33,7 +33,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: session.c,v 1.126 2002/02/14 23:28:00 markus Exp $");
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RCSID("$OpenBSD: session.c,v 1.127 2002/02/15 23:11:26 markus Exp $");
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#include "ssh.h"
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#include "ssh1.h"
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@ -657,6 +657,7 @@ do_exec(Session *s, const char *command)
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original_command = NULL;
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}
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/* administrative, login(1)-like work */
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void
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do_login(Session *s, const char *command)
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@ -677,7 +678,7 @@ do_login(Session *s, const char *command)
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if (packet_connection_is_on_socket()) {
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fromlen = sizeof(from);
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if (getpeername(packet_get_connection_in(),
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(struct sockaddr *) & from, &fromlen) < 0) {
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(struct sockaddr *) & from, &fromlen) < 0) {
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debug("getpeername: %.100s", strerror(errno));
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fatal_cleanup();
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}
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@ -883,134 +884,13 @@ void copy_environment(char **source, char ***env, u_int *envsize)
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}
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}
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/*
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* Performs common processing for the child, such as setting up the
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* environment, closing extra file descriptors, setting the user and group
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* ids, and executing the command or shell.
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*/
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void
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do_child(Session *s, const char *command)
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static char **
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do_setup_env(Session *s, const char *shell)
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{
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const char *shell, *hostname = NULL, *cp = NULL;
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struct passwd *pw = s->pw;
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char buf[256];
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char cmd[1024];
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FILE *f = NULL;
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u_int envsize, i;
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u_int i, envsize;
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char **env;
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extern char **environ;
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struct stat st;
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char *argv[10];
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int do_xauth;
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do_xauth =
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s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
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/* remove hostkey from the child's memory */
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destroy_sensitive_data();
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/* login(1) is only called if we execute the login shell */
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if (options.use_login && command != NULL)
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options.use_login = 0;
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#if !defined(HAVE_OSF_SIA)
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if (!options.use_login) {
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# ifdef HAVE_LOGIN_CAP
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if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
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f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
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_PATH_NOLOGIN), "r");
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# else /* HAVE_LOGIN_CAP */
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if (pw->pw_uid)
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f = fopen(_PATH_NOLOGIN, "r");
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# endif /* HAVE_LOGIN_CAP */
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if (f) {
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/* /etc/nologin exists. Print its contents and exit. */
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while (fgets(buf, sizeof(buf), f))
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fputs(buf, stderr);
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fclose(f);
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exit(254);
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}
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}
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#endif /* HAVE_OSF_SIA */
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/* Set login name, uid, gid, and groups. */
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/* Login(1) does this as well, and it needs uid 0 for the "-h"
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switch, so we let login(1) to this for us. */
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if (!options.use_login) {
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#ifdef HAVE_OSF_SIA
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session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
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if (!check_quietlogin(s, command))
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do_motd();
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#else /* HAVE_OSF_SIA */
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#ifdef HAVE_CYGWIN
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if (is_winnt) {
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#else
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if (getuid() == 0 || geteuid() == 0) {
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#endif
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# ifdef HAVE_GETUSERATTR
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set_limits_from_userattr(pw->pw_name);
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# endif /* HAVE_GETUSERATTR */
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# ifdef HAVE_LOGIN_CAP
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if (setusercontext(lc, pw, pw->pw_uid,
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(LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
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perror("unable to set user context");
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exit(1);
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}
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# else /* HAVE_LOGIN_CAP */
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#if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
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/* Sets login uid for accounting */
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if (getluid() == -1 && setluid(pw->pw_uid) == -1)
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error("setluid: %s", strerror(errno));
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#endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
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if (setlogin(pw->pw_name) < 0)
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error("setlogin failed: %s", strerror(errno));
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if (setgid(pw->pw_gid) < 0) {
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perror("setgid");
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exit(1);
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}
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/* Initialize the group list. */
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if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
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perror("initgroups");
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exit(1);
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}
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endgrent();
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# ifdef USE_PAM
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/*
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* PAM credentials may take the form of
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* supplementary groups. These will have been
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* wiped by the above initgroups() call.
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* Reestablish them here.
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*/
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do_pam_setcred(0);
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# endif /* USE_PAM */
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# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
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irix_setusercontext(pw);
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# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
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#ifdef _AIX
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aix_usrinfo(s)
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#endif
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/* Permanently switch to the desired uid. */
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permanently_set_uid(pw);
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# endif /* HAVE_LOGIN_CAP */
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}
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#endif /* HAVE_OSF_SIA */
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#ifdef HAVE_CYGWIN
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if (is_winnt)
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#endif
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if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
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fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
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}
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/*
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* Get the shell from the password data. An empty shell field is
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* legal, and means /bin/sh.
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*/
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shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
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#ifdef HAVE_LOGIN_CAP
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shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
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#endif
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struct passwd *pw = s->pw;
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/* Initialize the environment. */
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envsize = 100;
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@ -1060,7 +940,7 @@ do_child(Session *s, const char *command)
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while (custom_environment) {
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struct envstring *ce = custom_environment;
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char *s = ce->s;
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int i;
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for (i = 0; s[i] != '=' && s[i]; i++)
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;
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if (s[i] == '=') {
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@ -1074,7 +954,7 @@ do_child(Session *s, const char *command)
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}
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snprintf(buf, sizeof buf, "%.50s %d %d",
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get_remote_ipaddr(), get_remote_port(), get_local_port());
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get_remote_ipaddr(), get_remote_port(), get_local_port());
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child_set_env(&env, &envsize, "SSH_CLIENT", buf);
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if (s->ttyfd != -1)
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@ -1125,6 +1005,206 @@ do_child(Session *s, const char *command)
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for (i = 0; env[i]; i++)
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fprintf(stderr, " %.200s\n", env[i]);
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}
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return env;
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}
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/*
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* Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
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* first in this order).
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*/
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static void
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do_rc_files(Session *s, const char *shell)
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{
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FILE *f = NULL;
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char cmd[1024];
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int do_xauth;
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struct stat st;
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do_xauth =
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s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
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/* ignore _PATH_SSH_USER_RC for subsystems */
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if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
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snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
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shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
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if (debug_flag)
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fprintf(stderr, "Running %s\n", cmd);
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f = popen(cmd, "w");
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if (f) {
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if (do_xauth)
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fprintf(f, "%s %s\n", s->auth_proto,
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s->auth_data);
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pclose(f);
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} else
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fprintf(stderr, "Could not run %s\n",
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_PATH_SSH_USER_RC);
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} else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
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if (debug_flag)
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fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
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_PATH_SSH_SYSTEM_RC);
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f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
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if (f) {
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if (do_xauth)
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fprintf(f, "%s %s\n", s->auth_proto,
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s->auth_data);
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pclose(f);
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} else
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fprintf(stderr, "Could not run %s\n",
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_PATH_SSH_SYSTEM_RC);
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} else if (do_xauth && options.xauth_location != NULL) {
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/* Add authority data to .Xauthority if appropriate. */
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if (debug_flag) {
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fprintf(stderr,
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"Running %.100s add "
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"%.100s %.100s %.100s\n",
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options.xauth_location, s->auth_display,
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s->auth_proto, s->auth_data);
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}
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snprintf(cmd, sizeof cmd, "%s -q -",
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options.xauth_location);
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f = popen(cmd, "w");
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if (f) {
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fprintf(f, "add %s %s %s\n",
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s->auth_display, s->auth_proto,
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s->auth_data);
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pclose(f);
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} else {
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fprintf(stderr, "Could not run %s\n",
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cmd);
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}
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}
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}
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static void
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do_nologin(struct passwd *pw)
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{
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FILE *f = NULL;
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char buf[1024];
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#ifdef HAVE_LOGIN_CAP
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if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
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f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
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_PATH_NOLOGIN), "r");
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#else
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if (pw->pw_uid)
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f = fopen(_PATH_NOLOGIN, "r");
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#endif
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if (f) {
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/* /etc/nologin exists. Print its contents and exit. */
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while (fgets(buf, sizeof(buf), f))
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fputs(buf, stderr);
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fclose(f);
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exit(254);
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}
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}
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/* Set login name, uid, gid, and groups. */
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static void
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do_setusercontext(struct passwd *pw)
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{
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#ifdef HAVE_CYGWIN
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if (iswinnt) {
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#else /* HAVE_CYGWIN */
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if (getuid() == 0 || geteuid() == 0) {
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#endif /* HAVE_CYGWIN */
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#ifdef HAVE_GETUSERATTR
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set_limits_from_userattr(pw->pw_name);
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#endif /* HAVE_GETUSERATTR */
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#ifdef HAVE_LOGIN_CAP
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if (setusercontext(lc, pw, pw->pw_uid,
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(LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
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perror("unable to set user context");
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exit(1);
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}
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#else
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# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
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/* Sets login uid for accounting */
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if (getluid() == -1 && setluid(pw->pw_uid) == -1)
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error("setluid: %s", strerror(errno));
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# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
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if (setlogin(pw->pw_name) < 0)
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error("setlogin failed: %s", strerror(errno));
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if (setgid(pw->pw_gid) < 0) {
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perror("setgid");
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exit(1);
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}
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/* Initialize the group list. */
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if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
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perror("initgroups");
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exit(1);
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}
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endgrent();
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# ifdef USE_PAM
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/*
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* PAM credentials may take the form of supplementary groups.
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* These will have been wiped by the above initgroups() call.
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* Reestablish them here.
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*/
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do_pam_setcred(0);
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# endif /* USE_PAM */
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# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
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irix_setusercontext(pw);
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# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
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#ifdef _AIX
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aix_usrinfo(s)
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#endif
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/* Permanently switch to the desired uid. */
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permanently_set_uid(pw);
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#endif
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}
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if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
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fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
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}
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/*
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* Performs common processing for the child, such as setting up the
|
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* environment, closing extra file descriptors, setting the user and group
|
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* ids, and executing the command or shell.
|
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*/
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void
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do_child(Session *s, const char *command)
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{
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extern char **environ;
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char **env;
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char *argv[10];
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const char *shell, *shell0, *hostname = NULL;
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struct passwd *pw = s->pw;
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u_int i;
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/* remove hostkey from the child's memory */
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destroy_sensitive_data();
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|
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/* login(1) is only called if we execute the login shell */
|
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if (options.use_login && command != NULL)
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options.use_login = 0;
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|
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/*
|
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* Login(1) does this as well, and it needs uid 0 for the "-h"
|
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* switch, so we let login(1) to this for us.
|
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*/
|
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if (!options.use_login) {
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#ifdef HAVE_OSF_SIA
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session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
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if (!check_quietlogin(s, command))
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do_motd();
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#else /* HAVE_OSF_SIA */
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do_nologin(pw);
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do_setusercontext(pw);
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#endif /* HAVE_OSF_SIA */
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}
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/*
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* Get the shell from the password data. An empty shell field is
|
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* legal, and means /bin/sh.
|
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*/
|
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shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
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#ifdef HAVE_LOGIN_CAP
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shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
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#endif
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env = do_setup_env(s, shell);
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/* we have to stash the hostname before we close our socket. */
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if (options.use_login)
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hostname = get_remote_name_or_ip(utmp_len,
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@ -1192,114 +1272,65 @@ do_child(Session *s, const char *command)
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#endif
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}
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|
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/*
|
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* Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
|
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* first in this order).
|
||||
*/
|
||||
if (!options.use_login) {
|
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/* ignore _PATH_SSH_USER_RC for subsystems */
|
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if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
|
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snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
|
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shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
|
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if (debug_flag)
|
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fprintf(stderr, "Running %s\n", cmd);
|
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f = popen(cmd, "w");
|
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if (f) {
|
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if (do_xauth)
|
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fprintf(f, "%s %s\n", s->auth_proto,
|
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s->auth_data);
|
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pclose(f);
|
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} else
|
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fprintf(stderr, "Could not run %s\n",
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_PATH_SSH_USER_RC);
|
||||
} else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
|
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if (debug_flag)
|
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fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
|
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_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. */
|
||||
|
||||
perror("login");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
/* Execute the shell. */
|
||||
argv[0] = argv0;
|
||||
argv[1] = NULL;
|
||||
execve(shell, argv, env);
|
||||
|
||||
/* 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;
|
||||
|
|
|
|||
Loading…
Reference in New Issue