const char * ROKEN_LIB_FUNCTION
get_default_username (void)
{
const char *user;
user = getenv ("USER");
if (user == NULL)
user = getenv ("LOGNAME");
if (user == NULL)
user = getenv ("USERNAME");
#if defined(HAVE_GETLOGIN) && !defined(POSIX_GETLOGIN)
if (user == NULL) {
user = (const char *)getlogin ();
if (user != NULL)
return user;
}
#endif
#ifdef HAVE_PWD_H
{
uid_t uid = getuid ();
struct passwd *pwd;
if (user != NULL) {
pwd = k_getpwnam (user);
if (pwd != NULL && pwd->pw_uid == uid)
return user;
}
pwd = k_getpwuid (uid);
if (pwd != NULL)
return pwd->pw_name;
}
#endif
return user;
}
int
login_user(POP *p)
{
struct stat st;
struct passwd *pw;
/* Look for the user in the password file */
if ((pw = k_getpwnam(p->user)) == NULL) {
pop_log(p, POP_PRIORITY, "user %s (from %s) not found",
p->user, p->ipaddr);
return pop_msg(p, POP_FAILURE, "Login incorrect.");
}
pop_log(p, POP_INFO, "login from %s as %s", p->ipaddr, p->user);
/* Build the name of the user's maildrop */
snprintf(p->drop_name, sizeof(p->drop_name), "%s/%s", POP_MAILDIR, p->user);
if(stat(p->drop_name, &st) < 0 || !S_ISDIR(st.st_mode)){
/* Make a temporary copy of the user's maildrop */
/* and set the group and user id */
if (pop_dropcopy(p, pw) != POP_SUCCESS) return (POP_FAILURE);
/* Get information about the maildrop */
if (pop_dropinfo(p) != POP_SUCCESS) return(POP_FAILURE);
} else {
if(changeuser(p, pw) != POP_SUCCESS) return POP_FAILURE;
if(pop_maildir_info(p) != POP_SUCCESS) return POP_FAILURE;
}
/* Initialize the last-message-accessed number */
p->last_msg = 0;
return POP_SUCCESS;
}
int
afs_verify(char *name,
char *password,
int32_t *exp,
int quiet)
{
int ret = 1;
struct passwd *pwd = k_getpwnam (name);
if(pwd == NULL)
return 1;
if (!pag_set && k_hasafs()) {
k_setpag();
pag_set=1;
}
if (ret)
ret = unix_verify_user (name, password);
#ifdef KRB5
if (ret)
ret = verify_krb5(pwd, password, exp, quiet);
#endif
#ifdef KRB4
if(ret)
ret = verify_krb4(pwd, password, exp, quiet);
#endif
return ret;
}
/*
* expand tilde from the passwd file.
*/
static const Char *
globtilde(const Char *pattern, Char *patbuf, glob_t *pglob)
{
struct passwd *pwd;
char *h;
const Char *p;
Char *b;
if (*pattern != CHAR_TILDE || !(pglob->gl_flags & GLOB_TILDE))
return pattern;
/* Copy up to the end of the string or / */
for (p = pattern + 1, h = (char *) patbuf; *p && *p != CHAR_SLASH;
*h++ = *p++)
continue;
*h = CHAR_EOS;
if (((char *) patbuf)[0] == CHAR_EOS) {
/*
* handle a plain ~ or ~/ by expanding $HOME
* first and then trying the password file
*/
if ((h = getenv("HOME")) == NULL) {
if ((pwd = k_getpwuid(getuid())) == NULL)
return pattern;
else
h = pwd->pw_dir;
}
}
else {
/*
* Expand a ~user
*/
if ((pwd = k_getpwnam((char*) patbuf)) == NULL)
return pattern;
else
h = pwd->pw_dir;
}
/* Copy the home directory */
for (b = patbuf; *h; *b++ = *h++)
continue;
/* Append the rest of the pattern */
while ((*b++ = *p++) != CHAR_EOS)
continue;
return patbuf;
}
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
unix_verify_user(char *user, char *password)
{
struct passwd *pw;
pw = k_getpwnam(user);
if(pw == NULL)
return -1;
if(strlen(pw->pw_passwd) == 0 && strlen(password) == 0)
return 0;
if(strcmp(crypt(password, pw->pw_passwd), pw->pw_passwd) == 0)
return 0;
return -1;
}
const char *
ftp_rooted(const char *path)
{
static char home[MaxPathLen] = "";
static char newpath[MaxPathLen];
struct passwd *pwd;
if(!home[0])
if((pwd = k_getpwnam("ftp")))
strlcpy(home, pwd->pw_dir, sizeof(home));
snprintf(newpath, sizeof(newpath), "%s/%s", home, path);
if(access(newpath, X_OK))
strlcpy(newpath, path, sizeof(newpath));
return newpath;
}
ROKEN_LIB_FUNCTION const char * ROKEN_LIB_CALL
get_default_username (void)
{
const char *user;
user = getenv ("USER");
if (user == NULL)
user = getenv ("LOGNAME");
if (user == NULL)
user = getenv ("USERNAME");
#if defined(HAVE_GETLOGIN) && !defined(POSIX_GETLOGIN)
if (user == NULL) {
user = (const char *)getlogin ();
if (user != NULL)
return user;
}
#endif
#ifdef HAVE_PWD_H
{
uid_t uid = getuid ();
struct passwd *pwd;
if (user != NULL) {
pwd = k_getpwnam (user);
if (pwd != NULL && pwd->pw_uid == uid)
return user;
}
pwd = k_getpwuid (uid);
if (pwd != NULL)
return pwd->pw_name;
}
#endif
#ifdef _WIN32
/* TODO: We can call GetUserNameEx() and figure out a
username. However, callers do not free the return value of this
function. */
#endif
return user;
}
/*
* New .rhosts strategy: We are passed an ip address. We spin through
* hosts.equiv and .rhosts looking for a match. When the .rhosts only
* has ip addresses, we don't have to trust a nameserver. When it
* contains hostnames, we spin through the list of addresses the nameserver
* gives us and look for a match.
*
* Returns 0 if ok, -1 if not ok.
*/
int ROKEN_LIB_FUNCTION
iruserok(unsigned raddr, int superuser, const char *ruser, const char *luser)
{
char *cp;
struct stat sbuf;
struct passwd *pwd;
FILE *hostf;
uid_t uid;
int first;
char pbuf[MaxPathLen];
first = 1;
hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
again:
if (hostf) {
if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
fclose(hostf);
return (0);
}
fclose(hostf);
}
if (first == 1 && (__check_rhosts_file || superuser)) {
first = 0;
if ((pwd = k_getpwnam((char*)luser)) == NULL)
return (-1);
snprintf (pbuf, sizeof(pbuf), "%s/.rhosts", pwd->pw_dir);
/*
* Change effective uid while opening .rhosts. If root and
* reading an NFS mounted file system, can't read files that
* are protected read/write owner only.
*/
uid = geteuid();
if (seteuid(pwd->pw_uid) < 0)
return (-1);
hostf = fopen(pbuf, "r");
seteuid(uid);
if (hostf == NULL)
return (-1);
/*
* If not a regular file, or is owned by someone other than
* user or root or if writeable by anyone but the owner, quit.
*/
cp = NULL;
if (lstat(pbuf, &sbuf) < 0)
cp = ".rhosts lstat failed";
else if (!S_ISREG(sbuf.st_mode))
cp = ".rhosts not regular file";
else if (fstat(fileno(hostf), &sbuf) < 0)
cp = ".rhosts fstat failed";
else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
cp = "bad .rhosts owner";
else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
cp = ".rhosts writeable by other than owner";
/* If there were any problems, quit. */
if (cp) {
__rcmd_errstr = cp;
fclose(hostf);
return (-1);
}
goto again;
}
return (-1);
}
int
main(int argc, char **argv)
{
int i, optidx = 0;
char *su_user;
struct passwd *su_info;
struct passwd *login_info;
struct passwd *pwd;
char *shell;
int ok = 0;
setprogname (argv[0]);
if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
usage(1);
for (i=0; i < optidx; i++)
if (strcmp(argv[i], "-") == 0) {
full_login = 1;
break;
}
if(help_flag)
usage(0);
if(version_flag) {
print_version(NULL);
exit(0);
}
if(optidx >= argc)
su_user = "******";
else
su_user = argv[optidx++];
if (!issuid() && getuid() != 0)
warnx("Not setuid and you are not root, expect this to fail");
pwd = k_getpwnam(su_user);
if(pwd == NULL)
errx (1, "unknown login %s", su_user);
if (pwd->pw_uid == 0 && strcmp ("root", su_user) != 0) {
syslog (LOG_ALERT, "NIS attack, user %s has uid 0", su_user);
errx (1, "unknown login %s", su_user);
}
su_info = dup_info(pwd);
if (su_info == NULL)
errx (1, "malloc: out of memory");
pwd = getpwuid(getuid());
if(pwd == NULL)
errx(1, "who are you?");
login_info = dup_info(pwd);
if (login_info == NULL)
errx (1, "malloc: out of memory");
if(env_flag)
shell = login_info->pw_shell;
else
shell = su_info->pw_shell;
if(shell == NULL || *shell == '\0')
shell = _PATH_BSHELL;
#ifdef KRB5
if(kerberos_flag && ok == 0 &&
krb5_verify(login_info, su_info, kerberos_instance) == 0)
ok = 5;
#endif
if(ok == 0 && login_info->pw_uid && verify_unix(login_info, su_info) != 0) {
printf("Sorry!\n");
exit(1);
}
#ifdef HAVE_GETSPNAM
{ struct spwd *sp;
long today;
sp = getspnam(su_info->pw_name);
if (sp != NULL) {
today = time(0)/(24L * 60 * 60);
if (sp->sp_expire > 0) {
if (today >= sp->sp_expire) {
if (login_info->pw_uid)
errx(1,"Your account has expired.");
else
printf("Your account has expired.");
}
else if (sp->sp_expire - today < 14)
printf("Your account will expire in %d days.\n",
(int)(sp->sp_expire - today));
}
if (sp->sp_max > 0) {
if (today >= sp->sp_lstchg + sp->sp_max) {
if (login_info->pw_uid)
errx(1,"Your password has expired. Choose a new one.");
else
printf("Your password has expired. Choose a new one.");
}
else if (today >= sp->sp_lstchg + sp->sp_max - sp->sp_warn)
printf("Your account will expire in %d days.\n",
(int)(sp->sp_lstchg + sp->sp_max -today));
}
}
}
#endif
{
char *tty = ttyname (STDERR_FILENO);
if (tty)
syslog (LOG_NOTICE | LOG_AUTH, "%s to %s on %s",
login_info->pw_name, su_info->pw_name, tty);
else
syslog (LOG_NOTICE | LOG_AUTH, "%s to %s",
login_info->pw_name, su_info->pw_name);
}
if(!env_flag) {
if(full_login) {
char *t = getenv ("TERM");
char **newenv = NULL;
int j;
i = read_environment(_PATH_ETC_ENVIRONMENT, &newenv);
environ = malloc ((10 + i) * sizeof (char *));
if (environ == NULL)
err (1, "malloc");
environ[0] = NULL;
for (j = 0; j < i; j++) {
char *p = strchr(newenv[j], '=');
if (p == NULL)
errx(1, "environment '%s' missing '='", newenv[j]);
*p++ = 0;
esetenv (newenv[j], p, 1);
}
free(newenv);
esetenv ("PATH", _PATH_DEFPATH, 1);
if (t)
esetenv ("TERM", t, 1);
if (chdir (su_info->pw_dir) < 0)
errx (1, "no directory");
}
if (full_login || su_info->pw_uid)
esetenv ("USER", su_info->pw_name, 1);
esetenv("HOME", su_info->pw_dir, 1);
esetenv("SHELL", shell, 1);
}
{
char **new_argv;
char *p;
p = strrchr(shell, '/');
if(p)
p++;
else
p = shell;
if (strcmp(p, "csh") != 0)
csh_f_flag = 0;
new_argv = malloc(((cmd ? 2 : 0) + 1 + argc - optidx + 1 + csh_f_flag)
* sizeof(*new_argv));
if (new_argv == NULL)
err (1, "malloc");
i = 0;
if(full_login) {
if (asprintf(&new_argv[i++], "-%s", p) == -1)
errx (1, "malloc");
} else
new_argv[i++] = p;
if (cmd) {
new_argv[i++] = "-c";
new_argv[i++] = cmd;
}
if (csh_f_flag)
new_argv[i++] = "-f";
for (argv += optidx; *argv; ++argv)
new_argv[i++] = *argv;
new_argv[i] = NULL;
if(setgid(su_info->pw_gid) < 0)
err(1, "setgid");
if (initgroups (su_info->pw_name, su_info->pw_gid) < 0)
err (1, "initgroups");
if(setuid(su_info->pw_uid) < 0
|| (su_info->pw_uid != 0 && setuid(0) == 0))
err(1, "setuid");
#ifdef KRB5
if (ok == 5)
krb5_start_session();
#endif
execve(shell, new_argv, environ);
}
exit(1);
}
int
pop_pass (POP *p)
{
struct passwd *pw;
int i;
int status;
/* Make one string of all these parameters */
for (i = 1; i < p->parm_count; ++i)
p->pop_parm[i][strlen(p->pop_parm[i])] = ' ';
/* Look for the user in the password file */
if ((pw = k_getpwnam(p->user)) == NULL)
return (pop_msg(p,POP_FAILURE,
"Password supplied for \"%s\" is incorrect.",
p->user));
if (p->kerberosp) {
#ifdef KRB5
if (p->version == 5) {
char *name;
if (!krb5_kuserok (p->context, p->principal, p->user)) {
pop_log (p, POP_PRIORITY,
"krb5 permission denied");
return pop_msg(p, POP_FAILURE,
"Popping not authorized");
}
if(krb5_unparse_name (p->context, p->principal, &name) == 0) {
pop_log(p, POP_INFO, "%s: %s -> %s",
p->ipaddr, name, p->user);
free (name);
}
} else {
pop_log (p, POP_PRIORITY, "kerberos authentication failed");
return pop_msg (p, POP_FAILURE,
"kerberos authentication failed");
}
#endif
{ }
} else {
/* We don't accept connections from users with null passwords */
if (pw->pw_passwd == NULL)
return (pop_msg(p,
POP_FAILURE,
"Password supplied for \"%s\" is incorrect.",
p->user));
#ifdef OTP
if (otp_verify_user (&p->otp_ctx, p->pop_parm[1]) == 0)
/* pass OK */;
else
#endif
/* Compare the supplied password with the password file entry */
if (p->auth_level != AUTH_NONE)
return pop_msg(p, POP_FAILURE,
"Password supplied for \"%s\" is incorrect.",
p->user);
else if (!strcmp(crypt(p->pop_parm[1], pw->pw_passwd), pw->pw_passwd))
/* pass OK */;
else {
int ret = -1;
#ifdef KRB5
if(ret)
ret = krb5_verify_password (p);
#endif
if(ret)
return pop_msg(p, POP_FAILURE,
"Password incorrect");
}
}
status = login_user(p);
if(status != POP_SUCCESS)
return status;
/* Authorization completed successfully */
return (pop_msg (p, POP_SUCCESS,
"%s has %d message(s) (%ld octets).",
p->user, p->msg_count, p->drop_size));
}
int
main(int argc, char **argv)
{
int max_tries = 5;
int try;
char username[32];
int optidx = 0;
int ask = 1;
struct sigaction sa;
setprogname(argv[0]);
#ifdef KRB5
{
krb5_error_code ret;
ret = krb5_init_context(&context);
if (ret)
errx (1, "krb5_init_context failed: %d", ret);
}
#endif
openlog("login", LOG_ODELAY | LOG_PID, LOG_AUTH);
if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
&optidx))
usage (1);
argc -= optidx;
argv += optidx;
if(help_flag)
usage(0);
if (version_flag) {
print_version (NULL);
return 0;
}
if (geteuid() != 0)
errx(1, "only root may use login, use su");
/* Default tty settings. */
stty_default();
if(p_flag)
copy_env();
else {
/* this set of variables is always preserved by BSD login */
if(getenv("TERM"))
add_env("TERM", getenv("TERM"));
if(getenv("TZ"))
add_env("TZ", getenv("TZ"));
}
if(*argv){
if(strchr(*argv, '=') == NULL && strcmp(*argv, "-") != 0){
strlcpy (username, *argv, sizeof(username));
ask = 0;
}
}
#if defined(DCE) && defined(AIX)
esetenv("AUTHSTATE", "DCE", 1);
#endif
/* XXX should we care about environment on the command line? */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sig_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGALRM, &sa, NULL);
alarm(login_timeout);
for(try = 0; try < max_tries; try++){
struct passwd *pwd;
char password[128];
int ret;
char ttname[32];
char *tty, *ttyn;
char prompt[128];
#ifdef OTP
char otp_str[256];
#endif
if(ask){
f_flag = 0;
#if 0
r_flag = 0;
#endif
ret = read_string("login: "******"");
}
else
#endif
{
#ifdef OTP
if(auth_level && strcmp(auth_level, "otp") == 0 &&
otp_challenge(&otp_ctx, username,
otp_str, sizeof(otp_str)) == 0)
snprintf (prompt, sizeof(prompt), "%s's %s Password: "******"Password: "******"Login incorrect.\n");
ask = 1;
continue;
}
if(f_flag == 0 && check_password(pwd, password)){
fprintf(stderr, "Login incorrect.\n");
ask = 1;
continue;
}
ttyn = ttyname(STDIN_FILENO);
if(ttyn == NULL){
snprintf(ttname, sizeof(ttname), "%s??", _PATH_TTY);
ttyn = ttname;
}
if (strncmp (ttyn, _PATH_DEV, strlen(_PATH_DEV)) == 0)
tty = ttyn + strlen(_PATH_DEV);
else
tty = ttyn;
if (login_access (pwd, remote_host ? remote_host : tty) == 0) {
fprintf(stderr, "Permission denied\n");
if (remote_host)
syslog(LOG_NOTICE, "%s LOGIN REFUSED FROM %s",
pwd->pw_name, remote_host);
else
syslog(LOG_NOTICE, "%s LOGIN REFUSED ON %s",
pwd->pw_name, tty);
exit (1);
} else {
if (remote_host)
syslog(LOG_NOTICE, "%s LOGIN ACCEPTED FROM %s ppid=%d",
pwd->pw_name, remote_host, (int) getppid());
else
syslog(LOG_NOTICE, "%s LOGIN ACCEPTED ON %s ppid=%d",
pwd->pw_name, tty, (int) getppid());
}
alarm(0);
do_login(pwd, tty, ttyn);
}
exit(1);
}
