/release/picobsd/tinyware/login/pico-login.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 1093 lines · 783 code · 127 blank · 183 comment · 240 complexity · 31f94ace253a9165fd9e00bbccca14d5 MD5 · raw file
- /*-
- * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
- * The Regents of the University of California. 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
- */
- #if 0
- static char copyright[] =
- "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
- #endif
- static const char rcsid[] =
- "$FreeBSD$";
- #endif /* not lint */
- /*
- * login [ name ]
- * login -h hostname (for telnetd, etc.)
- * login -f name (for pre-authenticated login: datakit, xterm, etc.)
- */
- #include <sys/copyright.h>
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <sys/socket.h>
- #include <sys/time.h>
- #include <sys/resource.h>
- #include <sys/file.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <err.h>
- #include <errno.h>
- #include <grp.h>
- #include <libutil.h>
- #include <login_cap.h>
- #include <netdb.h>
- #include <pwd.h>
- #include <setjmp.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <syslog.h>
- #include <ttyent.h>
- #include <unistd.h>
- #include <utmpx.h>
- #ifdef USE_PAM
- #include <security/pam_appl.h>
- #include <security/openpam.h>
- #include <sys/wait.h>
- #endif /* USE_PAM */
- #include "pathnames.h"
- void badlogin(char *);
- void checknologin(void);
- void dolastlog(int);
- void getloginname(void);
- void motd(const char *);
- int rootterm(char *);
- void sigint(int);
- void sleepexit(int);
- void refused(char *,char *,int);
- char *stypeof(char *);
- void timedout(int);
- int login_access(char *, char *);
- void login_fbtab(char *, uid_t, gid_t);
- #ifdef USE_PAM
- static int auth_pam(void);
- static int export_pam_environment(void);
- static int ok_to_export(const char *);
- static pam_handle_t *pamh = NULL;
- static char **environ_pam;
- #define PAM_END { \
- if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) \
- syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); \
- if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) \
- syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); \
- if ((e = pam_end(pamh, e)) != PAM_SUCCESS) \
- syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); \
- }
- #endif
- static int auth_traditional(void);
- static void usage(void);
- #define TTYGRPNAME "tty" /* name of group to own ttys */
- #define DEFAULT_BACKOFF 3
- #define DEFAULT_RETRIES 10
- #define DEFAULT_PROMPT "login: "
- #define DEFAULT_PASSWD_PROMPT "Password:"
- /*
- * This bounds the time given to login. Not a define so it can
- * be patched on machines where it's too small.
- */
- u_int timeout = 300;
- /* Buffer for signal handling of timeout */
- jmp_buf timeout_buf;
- struct passwd *pwd;
- int failures;
- char *term, *envinit[1], *hostname, *tty, *username;
- const char *passwd_prompt, *prompt;
- char full_hostname[MAXHOSTNAMELEN];
- int
- main(argc, argv)
- int argc;
- char *argv[];
- {
- extern char **environ;
- struct group *gr;
- struct stat st;
- struct utmpx utmp;
- int rootok, retries, backoff;
- int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
- int changepass;
- time_t now, warntime;
- uid_t uid, euid;
- gid_t egid;
- char *p, *ttyn;
- char tbuf[MAXPATHLEN + 2];
- char tname[sizeof(_PATH_TTY) + 10];
- const char *shell = NULL;
- login_cap_t *lc = NULL;
- int UT_HOSTSIZE = sizeof(utmp.ut_host);
- int UT_NAMESIZE = sizeof(utmp.ut_user);
- #ifdef USE_PAM
- pid_t pid;
- int e;
- #endif /* USE_PAM */
- (void)signal(SIGQUIT, SIG_IGN);
- (void)signal(SIGINT, SIG_IGN);
- (void)signal(SIGHUP, SIG_IGN);
- if (setjmp(timeout_buf)) {
- if (failures)
- badlogin(tbuf);
- (void)fprintf(stderr, "Login timed out after %d seconds\n",
- timeout);
- exit(0);
- }
- (void)signal(SIGALRM, timedout);
- (void)alarm(timeout);
- (void)setpriority(PRIO_PROCESS, 0, 0);
- openlog("login", LOG_ODELAY, LOG_AUTH);
- /*
- * -p is used by getty to tell login not to destroy the environment
- * -f is used to skip a second login authentication
- * -h is used by other servers to pass the name of the remote
- * host to login so that it may be placed in utmp and wtmp
- */
- *full_hostname = '\0';
- term = NULL;
- fflag = hflag = pflag = 0;
- uid = getuid();
- euid = geteuid();
- egid = getegid();
- while ((ch = getopt(argc, argv, "fh:p")) != -1)
- switch (ch) {
- case 'f':
- fflag = 1;
- break;
- case 'h':
- if (uid)
- errx(1, "-h option: %s", strerror(EPERM));
- hflag = 1;
- if (strlcpy(full_hostname, optarg,
- sizeof(full_hostname)) >= sizeof(full_hostname))
- errx(1, "-h option: %s: exceeds maximum "
- "hostname size", optarg);
- trimdomain(optarg, UT_HOSTSIZE);
- if (strlen(optarg) > UT_HOSTSIZE) {
- struct addrinfo hints, *res;
- int ga_err;
-
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = AF_UNSPEC;
- ga_err = getaddrinfo(optarg, NULL, &hints,
- &res);
- if (ga_err == 0) {
- char hostbuf[MAXHOSTNAMELEN];
- getnameinfo(res->ai_addr,
- res->ai_addrlen,
- hostbuf,
- sizeof(hostbuf), NULL, 0,
- NI_NUMERICHOST);
- optarg = strdup(hostbuf);
- if (optarg == NULL) {
- syslog(LOG_NOTICE,
- "strdup(): %m");
- sleepexit(1);
- }
- } else
- optarg = "invalid hostname";
- if (res != NULL)
- freeaddrinfo(res);
- }
- hostname = optarg;
- break;
- case 'p':
- pflag = 1;
- break;
- case '?':
- default:
- if (!uid)
- syslog(LOG_ERR, "invalid flag %c", ch);
- usage();
- }
- argc -= optind;
- argv += optind;
- if (*argv) {
- username = *argv;
- ask = 0;
- } else
- ask = 1;
- for (cnt = getdtablesize(); cnt > 2; cnt--)
- (void)close(cnt);
- ttyn = ttyname(STDIN_FILENO);
- if (ttyn == NULL || *ttyn == '\0') {
- (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
- ttyn = tname;
- }
- if ((tty = strrchr(ttyn, '/')) != NULL)
- ++tty;
- else
- tty = ttyn;
- /*
- * Get "login-retries" & "login-backoff" from default class
- */
- lc = login_getclass(NULL);
- prompt = login_getcapstr(lc, "login_prompt",
- DEFAULT_PROMPT, DEFAULT_PROMPT);
- passwd_prompt = login_getcapstr(lc, "passwd_prompt",
- DEFAULT_PASSWD_PROMPT, DEFAULT_PASSWD_PROMPT);
- retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES,
- DEFAULT_RETRIES);
- backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF,
- DEFAULT_BACKOFF);
- login_close(lc);
- lc = NULL;
- for (cnt = 0;; ask = 1) {
- if (ask) {
- fflag = 0;
- getloginname();
- }
- rootlogin = 0;
- rootok = rootterm(tty); /* Default (auth may change) */
- if (strlen(username) > UT_NAMESIZE)
- username[UT_NAMESIZE] = '\0';
- /*
- * Note if trying multiple user names; log failures for
- * previous user name, but don't bother logging one failure
- * for nonexistent name (mistyped username).
- */
- if (failures && strcmp(tbuf, username)) {
- if (failures > (pwd ? 0 : 1))
- badlogin(tbuf);
- }
- (void)strlcpy(tbuf, username, sizeof(tbuf));
- pwd = getpwnam(username);
- /*
- * if we have a valid account name, and it doesn't have a
- * password, or the -f option was specified and the caller
- * is root or the caller isn't changing their uid, don't
- * authenticate.
- */
- if (pwd != NULL) {
- if (pwd->pw_uid == 0)
- rootlogin = 1;
- if (fflag && (uid == (uid_t)0 ||
- uid == (uid_t)pwd->pw_uid)) {
- /* already authenticated */
- break;
- } else if (pwd->pw_passwd[0] == '\0') {
- if (!rootlogin || rootok) {
- /* pretend password okay */
- rval = 0;
- goto ttycheck;
- }
- }
- }
- fflag = 0;
- (void)setpriority(PRIO_PROCESS, 0, -4);
- #ifdef USE_PAM
- /*
- * Try to authenticate using PAM. If a PAM system error
- * occurs, perhaps because of a botched configuration,
- * then fall back to using traditional Unix authentication.
- */
- if ((rval = auth_pam()) == -1)
- #endif /* USE_PAM */
- rval = auth_traditional();
- (void)setpriority(PRIO_PROCESS, 0, 0);
- #ifdef USE_PAM
- /*
- * PAM authentication may have changed "pwd" to the
- * entry for the template user. Check again to see if
- * this is a root login after all.
- */
- if (pwd != NULL && pwd->pw_uid == 0)
- rootlogin = 1;
- #endif /* USE_PAM */
- ttycheck:
- /*
- * If trying to log in as root without Kerberos,
- * but with insecure terminal, refuse the login attempt.
- */
- if (pwd && !rval) {
- if (rootlogin && !rootok)
- refused(NULL, "NOROOT", 0);
- else /* valid password & authenticated */
- break;
- }
- (void)printf("Login incorrect\n");
- failures++;
- /*
- * we allow up to 'retry' (10) tries,
- * but after 'backoff' (3) we start backing off
- */
- if (++cnt > backoff) {
- if (cnt >= retries) {
- badlogin(username);
- sleepexit(1);
- }
- sleep((u_int)((cnt - backoff) * 5));
- }
- }
- /* committed to login -- turn off timeout */
- (void)alarm((u_int)0);
- (void)signal(SIGHUP, SIG_DFL);
- endpwent();
- /*
- * Establish the login class.
- */
- lc = login_getpwclass(pwd);
- /* if user not super-user, check for disabled logins */
- if (!rootlogin)
- auth_checknologin(lc);
- quietlog = login_getcapbool(lc, "hushlogin", 0);
- /*
- * Switching needed for NFS with root access disabled.
- *
- * XXX: This change fails to modify the additional groups for the
- * process, and as such, may restrict rights normally granted
- * through those groups.
- */
- (void)setegid(pwd->pw_gid);
- (void)seteuid(rootlogin ? 0 : pwd->pw_uid);
- if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
- if (login_getcapbool(lc, "requirehome", 0))
- refused("Home directory not available", "HOMEDIR", 1);
- if (chdir("/") < 0)
- refused("Cannot find root directory", "ROOTDIR", 1);
- if (!quietlog || *pwd->pw_dir)
- printf("No home directory.\nLogging in with home = \"/\".\n");
- pwd->pw_dir = "/";
- }
- (void)seteuid(euid);
- (void)setegid(egid);
- if (!quietlog)
- quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
- now = time(NULL);
- #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
- warntime = login_getcaptime(lc, "warnexpire", DEFAULT_WARN,
- DEFAULT_WARN);
- if (pwd->pw_expire) {
- if (now >= pwd->pw_expire) {
- refused("Sorry -- your account has expired", "EXPIRED",
- 1);
- } else if (pwd->pw_expire - now < warntime && !quietlog)
- (void)printf("Warning: your account expires on %s",
- ctime(&pwd->pw_expire));
- }
- warntime = login_getcaptime(lc, "warnpassword", DEFAULT_WARN,
- DEFAULT_WARN);
- changepass = 0;
- if (pwd->pw_change) {
- if (now >= pwd->pw_change) {
- (void)printf("Sorry -- your password has expired.\n");
- changepass = 1;
- syslog(LOG_INFO, "%s Password expired - forcing change",
- pwd->pw_name);
- } else if (pwd->pw_change - now < warntime && !quietlog)
- (void)printf("Warning: your password expires on %s",
- ctime(&pwd->pw_change));
- }
- if (lc != NULL) {
- if (hostname) {
- struct addrinfo hints, *res;
- int ga_err;
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = AF_UNSPEC;
- ga_err = getaddrinfo(full_hostname, NULL, &hints,
- &res);
- if (ga_err == 0) {
- char hostbuf[MAXHOSTNAMELEN];
- getnameinfo(res->ai_addr, res->ai_addrlen,
- hostbuf, sizeof(hostbuf), NULL, 0,
- NI_NUMERICHOST);
- if ((optarg = strdup(hostbuf)) == NULL) {
- syslog(LOG_NOTICE, "strdup(): %m");
- sleepexit(1);
- }
- } else
- optarg = NULL;
- if (res != NULL)
- freeaddrinfo(res);
- if (!auth_hostok(lc, full_hostname, optarg))
- refused("Permission denied", "HOST", 1);
- }
- if (!auth_ttyok(lc, tty))
- refused("Permission denied", "TTY", 1);
- if (!auth_timeok(lc, time(NULL)))
- refused("Logins not available right now", "TIME", 1);
- }
- shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
- if (*pwd->pw_shell == '\0')
- pwd->pw_shell = _PATH_BSHELL;
- if (*shell == '\0') /* Not overridden */
- shell = pwd->pw_shell;
- if ((shell = strdup(shell)) == NULL) {
- syslog(LOG_NOTICE, "strdup(): %m");
- sleepexit(1);
- }
- #ifdef LOGIN_ACCESS
- if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0)
- refused("Permission denied", "ACCESS", 1);
- #endif /* LOGIN_ACCESS */
- #if 1
- ulog_login(tty, username, hostname);
- #else
- /* Nothing else left to fail -- really log in. */
- memset((void *)&utmp, 0, sizeof(utmp));
- (void)gettimeofday(&utmp.ut_tv, NULL);
- (void)strncpy(utmp.ut_user, username, sizeof(utmp.ut_user));
- if (hostname)
- (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
- (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
- login(&utmp);
- #endif
- dolastlog(quietlog);
- /*
- * Set device protections, depending on what terminal the
- * user is logged in. This feature is used on Suns to give
- * console users better privacy.
- */
- login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
- /*
- * Clear flags of the tty. None should be set, and when the
- * user sets them otherwise, this can cause the chown to fail.
- * Since it isn't clear that flags are useful on character
- * devices, we just clear them.
- */
- if (chflags(ttyn, 0) && errno != EOPNOTSUPP)
- syslog(LOG_ERR, "chflags(%s): %m", ttyn);
- if (chown(ttyn, pwd->pw_uid,
- (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid))
- syslog(LOG_ERR, "chown(%s): %m", ttyn);
- /*
- * Preserve TERM if it happens to be already set.
- */
- if ((term = getenv("TERM")) != NULL) {
- if ((term = strdup(term)) == NULL) {
- syslog(LOG_NOTICE,
- "strdup(): %m");
- sleepexit(1);
- }
- }
- /*
- * Exclude cons/vt/ptys only, assume dialup otherwise
- * TODO: Make dialup tty determination a library call
- * for consistency (finger etc.)
- */
- if (hostname==NULL && isdialuptty(tty))
- syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
- #ifdef LOGALL
- /*
- * Syslog each successful login, so we don't have to watch hundreds
- * of wtmp or lastlogin files.
- */
- if (hostname)
- syslog(LOG_INFO, "login from %s on %s as %s",
- full_hostname, tty, pwd->pw_name);
- else
- syslog(LOG_INFO, "login on %s as %s",
- tty, pwd->pw_name);
- #endif
- /*
- * If fflag is on, assume caller/authenticator has logged root login.
- */
- if (rootlogin && fflag == 0)
- {
- if (hostname)
- syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
- username, tty, full_hostname);
- else
- syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
- username, tty);
- }
- /*
- * Destroy environment unless user has requested its preservation.
- * We need to do this before setusercontext() because that may
- * set or reset some environment variables.
- */
- if (!pflag)
- environ = envinit;
- /*
- * PAM modules might add supplementary groups during pam_setcred().
- */
- if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) {
- syslog(LOG_ERR, "setusercontext() failed - exiting");
- exit(1);
- }
- #ifdef USE_PAM
- if (pamh) {
- if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_open_session: %s",
- pam_strerror(pamh, e));
- } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED))
- != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_setcred: %s",
- pam_strerror(pamh, e));
- }
- /*
- * Add any environmental variables that the
- * PAM modules may have set.
- * Call *after* opening session!
- */
- if (pamh) {
- environ_pam = pam_getenvlist(pamh);
- if (environ_pam)
- export_pam_environment();
- }
- /*
- * We must fork() before setuid() because we need to call
- * pam_close_session() as root.
- */
- pid = fork();
- if (pid < 0) {
- err(1, "fork");
- PAM_END;
- exit(0);
- } else if (pid) {
- /* parent - wait for child to finish, then cleanup
- session */
- wait(NULL);
- PAM_END;
- exit(0);
- } else {
- if ((e = pam_end(pamh, 0)) != PAM_SUCCESS)
- syslog(LOG_ERR, "pam_end: %s",
- pam_strerror(pamh, e));
- }
- }
- #endif /* USE_PAM */
- /*
- * We don't need to be root anymore, so
- * set the user and session context
- */
- if (setlogin(username) != 0) {
- syslog(LOG_ERR, "setlogin(%s): %m - exiting", username);
- exit(1);
- }
- if (setusercontext(lc, pwd, pwd->pw_uid,
- LOGIN_SETALL & ~(LOGIN_SETLOGIN|LOGIN_SETGROUP)) != 0) {
- syslog(LOG_ERR, "setusercontext() failed - exiting");
- exit(1);
- }
- (void)setenv("SHELL", pwd->pw_shell, 1);
- (void)setenv("HOME", pwd->pw_dir, 1);
- if (term != NULL && *term != '\0')
- (void)setenv("TERM", term, 1); /* Preset overrides */
- else {
- (void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */
- }
- (void)setenv("LOGNAME", username, 1);
- (void)setenv("USER", username, 1);
- (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
- if (!quietlog) {
- const char *cw;
- cw = login_getcapstr(lc, "copyright", NULL, NULL);
- if (cw != NULL && access(cw, F_OK) == 0)
- motd(cw);
- else
- (void)printf("%s\n\t%s %s\n",
- "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
- "The Regents of the University of California. ",
- "All rights reserved.");
- (void)printf("\n");
- cw = login_getcapstr(lc, "welcome", NULL, NULL);
- if (cw == NULL || access(cw, F_OK) != 0)
- cw = _PATH_MOTDFILE;
- motd(cw);
- cw = getenv("MAIL"); /* $MAIL may have been set by class */
- if (cw != NULL)
- strlcpy(tbuf, cw, sizeof(tbuf));
- else
- snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR,
- pwd->pw_name);
- if (stat(tbuf, &st) == 0 && st.st_size != 0)
- (void)printf("You have %smail.\n",
- (st.st_mtime > st.st_atime) ? "new " : "");
- }
- login_close(lc);
- (void)signal(SIGALRM, SIG_DFL);
- (void)signal(SIGQUIT, SIG_DFL);
- (void)signal(SIGINT, SIG_DFL);
- (void)signal(SIGTSTP, SIG_IGN);
- /*
- * Login shells have a leading '-' in front of argv[0]
- */
- if (snprintf(tbuf, sizeof(tbuf), "-%s",
- (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell) >=
- sizeof(tbuf)) {
- syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size",
- username);
- errx(1, "shell exceeds maximum pathname size");
- }
- execlp(shell, tbuf, (char *)0);
- err(1, "%s", shell);
- }
- static int
- auth_traditional()
- {
- int rval;
- char *p;
- char *ep;
- char *salt;
- rval = 1;
- salt = pwd != NULL ? pwd->pw_passwd : "xx";
- p = getpass(passwd_prompt);
- ep = crypt(p, salt);
- if (pwd) {
- if (!p[0] && pwd->pw_passwd[0])
- ep = ":";
- if (strcmp(ep, pwd->pw_passwd) == 0)
- rval = 0;
- }
- /* clear entered password */
- memset(p, 0, strlen(p));
- return rval;
- }
- #ifdef USE_PAM
- /*
- * Attempt to authenticate the user using PAM. Returns 0 if the user is
- * authenticated, or 1 if not authenticated. If some sort of PAM system
- * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
- * function returns -1. This can be used as an indication that we should
- * fall back to a different authentication mechanism.
- */
- static int
- auth_pam()
- {
- const char *tmpl_user;
- const void *item;
- int rval;
- int e;
- static struct pam_conv conv = { openpam_ttyconv, NULL };
- if ((e = pam_start("login", username, &conv, &pamh)) != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
- return -1;
- }
- if ((e = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_set_item(PAM_TTY): %s",
- pam_strerror(pamh, e));
- return -1;
- }
- if (hostname != NULL &&
- (e = pam_set_item(pamh, PAM_RHOST, full_hostname)) != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
- pam_strerror(pamh, e));
- return -1;
- }
- e = pam_authenticate(pamh, 0);
- switch (e) {
- case PAM_SUCCESS:
- /*
- * With PAM we support the concept of a "template"
- * user. The user enters a login name which is
- * authenticated by PAM, usually via a remote service
- * such as RADIUS or TACACS+. If authentication
- * succeeds, a different but related "template" name
- * is used for setting the credentials, shell, and
- * home directory. The name the user enters need only
- * exist on the remote authentication server, but the
- * template name must be present in the local password
- * database.
- *
- * This is supported by two various mechanisms in the
- * individual modules. However, from the application's
- * point of view, the template user is always passed
- * back as a changed value of the PAM_USER item.
- */
- if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
- PAM_SUCCESS) {
- tmpl_user = (const char *) item;
- if (strcmp(username, tmpl_user) != 0)
- pwd = getpwnam(tmpl_user);
- } else
- syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
- pam_strerror(pamh, e));
- rval = 0;
- break;
- case PAM_AUTH_ERR:
- case PAM_USER_UNKNOWN:
- case PAM_MAXTRIES:
- rval = 1;
- break;
- default:
- syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
- rval = -1;
- break;
- }
- if (rval == 0) {
- e = pam_acct_mgmt(pamh, 0);
- if (e == PAM_NEW_AUTHTOK_REQD) {
- e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
- if (e != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_chauthtok: %s",
- pam_strerror(pamh, e));
- rval = 1;
- }
- } else if (e != PAM_SUCCESS) {
- rval = 1;
- }
- }
- if (rval != 0) {
- if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
- syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
- }
- pamh = NULL;
- }
- return rval;
- }
- static int
- export_pam_environment()
- {
- char **pp;
- for (pp = environ_pam; *pp != NULL; pp++) {
- if (ok_to_export(*pp))
- (void) putenv(*pp);
- free(*pp);
- }
- return PAM_SUCCESS;
- }
- /*
- * Sanity checks on PAM environmental variables:
- * - Make sure there is an '=' in the string.
- * - Make sure the string doesn't run on too long.
- * - Do not export certain variables. This list was taken from the
- * Solaris pam_putenv(3) man page.
- */
- static int
- ok_to_export(s)
- const char *s;
- {
- static const char *noexport[] = {
- "SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH",
- "IFS", "PATH", NULL
- };
- const char **pp;
- size_t n;
- if (strlen(s) > 1024 || strchr(s, '=') == NULL)
- return 0;
- if (strncmp(s, "LD_", 3) == 0)
- return 0;
- for (pp = noexport; *pp != NULL; pp++) {
- n = strlen(*pp);
- if (s[n] == '=' && strncmp(s, *pp, n) == 0)
- return 0;
- }
- return 1;
- }
- #endif /* USE_PAM */
- static void
- usage()
- {
- (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n");
- exit(1);
- }
- /*
- * Allow for authentication style and/or kerberos instance
- */
- #define NBUFSIZ 128 // XXX was UT_NAMESIZE + 64
- void
- getloginname()
- {
- int ch;
- char *p;
- static char nbuf[NBUFSIZ];
- for (;;) {
- (void)printf("%s", prompt);
- for (p = nbuf; (ch = getchar()) != '\n'; ) {
- if (ch == EOF) {
- badlogin(username);
- exit(0);
- }
- if (p < nbuf + (NBUFSIZ - 1))
- *p++ = ch;
- }
- if (p > nbuf) {
- if (nbuf[0] == '-')
- (void)fprintf(stderr,
- "login names may not start with '-'.\n");
- else {
- *p = '\0';
- username = nbuf;
- break;
- }
- }
- }
- }
- int
- rootterm(ttyn)
- char *ttyn;
- {
- struct ttyent *t;
- return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
- }
- volatile int motdinterrupt;
- void
- sigint(signo)
- int signo __unused;
- {
- motdinterrupt = 1;
- }
- void
- motd(motdfile)
- const char *motdfile;
- {
- int fd, nchars;
- sig_t oldint;
- char tbuf[256];
- if ((fd = open(motdfile, O_RDONLY, 0)) < 0)
- return;
- motdinterrupt = 0;
- oldint = signal(SIGINT, sigint);
- while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt)
- (void)write(fileno(stdout), tbuf, nchars);
- (void)signal(SIGINT, oldint);
- (void)close(fd);
- }
- /* ARGSUSED */
- void
- timedout(signo)
- int signo;
- {
- longjmp(timeout_buf, signo);
- }
- void
- dolastlog(quiet)
- int quiet;
- {
- #if 0 /* XXX not implemented after utmp->utmpx change */
- struct lastlog ll;
- int fd;
- if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
- (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
- if (!quiet) {
- if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
- ll.ll_time != 0) {
- (void)printf("Last login: %.*s ",
- 24-5, (char *)ctime(&ll.ll_time));
- if (*ll.ll_host != '\0')
- (void)printf("from %.*s\n",
- (int)sizeof(ll.ll_host),
- ll.ll_host);
- else
- (void)printf("on %.*s\n",
- (int)sizeof(ll.ll_line),
- ll.ll_line);
- }
- (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
- }
- memset((void *)&ll, 0, sizeof(ll));
- (void)time(&ll.ll_time);
- (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
- if (hostname)
- (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
- (void)write(fd, (char *)&ll, sizeof(ll));
- (void)close(fd);
- } else {
- syslog(LOG_ERR, "cannot open %s: %m", _PATH_LASTLOG);
- }
- #endif
- }
- void
- badlogin(name)
- char *name;
- {
- if (failures == 0)
- return;
- if (hostname) {
- syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
- failures, failures > 1 ? "S" : "", full_hostname);
- syslog(LOG_AUTHPRIV|LOG_NOTICE,
- "%d LOGIN FAILURE%s FROM %s, %s",
- failures, failures > 1 ? "S" : "", full_hostname, name);
- } else {
- syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
- failures, failures > 1 ? "S" : "", tty);
- syslog(LOG_AUTHPRIV|LOG_NOTICE,
- "%d LOGIN FAILURE%s ON %s, %s",
- failures, failures > 1 ? "S" : "", tty, name);
- }
- failures = 0;
- }
- #undef UNKNOWN
- #define UNKNOWN "su"
- char *
- stypeof(ttyid)
- char *ttyid;
- {
- struct ttyent *t;
- if (ttyid != NULL && *ttyid != '\0') {
- t = getttynam(ttyid);
- if (t != NULL && t->ty_type != NULL)
- return (t->ty_type);
- }
- return (UNKNOWN);
- }
- void
- refused(msg, rtype, lout)
- char *msg;
- char *rtype;
- int lout;
- {
- if (msg != NULL)
- printf("%s.\n", msg);
- if (hostname)
- syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s",
- pwd->pw_name, rtype, full_hostname, tty);
- else
- syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s",
- pwd->pw_name, rtype, tty);
- if (lout)
- sleepexit(1);
- }
- void
- sleepexit(eval)
- int eval;
- {
- (void)sleep(5);
- exit(eval);
- }