/*
* Check if the user is allowed to log in via ssh. If user is listed
* in DenyUsers or one of user's groups is listed in DenyGroups, false
* will be returned. If AllowUsers isn't empty and user isn't listed
* there, or if AllowGroups isn't empty and one of user's groups isn't
* listed there, false will be returned.
* If the user's shell is not executable, false will be returned.
* Otherwise true is returned.
*/
int
allowed_user(struct passwd * pw)
{
#ifdef HAVE_LOGIN_CAP
extern login_cap_t *lc;
int match_name, match_ip;
char *cap_hlist, *hp;
#endif
struct ssh *ssh = active_state; /* XXX */
struct stat st;
const char *hostname = NULL, *ipaddr = NULL;
int r;
u_int i;
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
if (!pw || !pw->pw_name)
return 0;
#ifdef HAVE_LOGIN_CAP
hostname = auth_get_canonical_hostname(ssh, options.use_dns);
ipaddr = ssh_remote_ipaddr(ssh);
lc = login_getclass(pw->pw_class);
/*
* Check the deny list.
*/
cap_hlist = login_getcapstr(lc, "host.deny", NULL, NULL);
if (cap_hlist != NULL) {
hp = strtok(cap_hlist, ",");
while (hp != NULL) {
match_name = match_hostname(hostname, hp);
match_ip = match_hostname(ipaddr, hp);
/*
* Only a positive match here causes a "deny".
*/
if (match_name > 0 || match_ip > 0) {
free(cap_hlist);
login_close(lc);
return 0;
}
hp = strtok(NULL, ",");
}
free(cap_hlist);
}
/*
* Check the allow list. If the allow list exists, and the
* remote host is not in it, the user is implicitly denied.
*/
cap_hlist = login_getcapstr(lc, "host.allow", NULL, NULL);
if (cap_hlist != NULL) {
hp = strtok(cap_hlist, ",");
if (hp == NULL) {
/* Just in case there's an empty string... */
free(cap_hlist);
login_close(lc);
return 0;
}
while (hp != NULL) {
match_name = match_hostname(hostname, hp);
match_ip = match_hostname(ipaddr, hp);
/*
* Negative match causes an immediate "deny".
* Positive match causes us to break out
* of the loop (allowing a fallthrough).
*/
if (match_name < 0 || match_ip < 0) {
free(cap_hlist);
login_close(lc);
return 0;
}
if (match_name > 0 || match_ip > 0)
break;
hp = strtok(NULL, ",");
}
free(cap_hlist);
if (hp == NULL) {
login_close(lc);
return 0;
}
}
login_close(lc);
#endif
#ifdef USE_PAM
if (!options.use_pam) {
#endif
/*
* password/account expiration.
*/
if (pw->pw_change || pw->pw_expire) {
struct timeval tv;
(void)gettimeofday(&tv, (struct timezone *)NULL);
if (pw->pw_expire) {
if (tv.tv_sec >= pw->pw_expire) {
logit("User %.100s not allowed because account has expired",
pw->pw_name);
return 0; /* expired */
}
}
#ifdef _PASSWORD_CHGNOW
if (pw->pw_change == _PASSWORD_CHGNOW) {
logit("User %.100s not allowed because password needs to be changed",
pw->pw_name);
return 0; /* can't force password change (yet) */
}
#endif
if (pw->pw_change) {
if (tv.tv_sec >= pw->pw_change) {
logit("User %.100s not allowed because password has expired",
pw->pw_name);
return 0; /* expired */
}
}
}
#ifdef USE_PAM
}
#endif
/*
* Deny if shell does not exist or is not executable unless we
* are chrooting.
*/
/*
* XXX Should check to see if it is executable by the
* XXX requesting user. --thorpej
*/
if (options.chroot_directory == NULL ||
strcasecmp(options.chroot_directory, "none") == 0) {
char *shell = xstrdup((pw->pw_shell[0] == '\0') ?
_PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */
if (stat(shell, &st) != 0) {
logit("User %.100s not allowed because shell %.100s "
"does not exist", pw->pw_name, shell);
free(shell);
return 0;
}
if (S_ISREG(st.st_mode) == 0 ||
(st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) {
logit("User %.100s not allowed because shell %.100s "
"is not executable", pw->pw_name, shell);
free(shell);
return 0;
}
free(shell);
}
/*
* XXX Consider nuking {Allow,Deny}{Users,Groups}. We have the
* XXX login_cap(3) mechanism which covers all other types of
* XXX logins, too.
*/
if (options.num_deny_users > 0 || options.num_allow_users > 0 ||
options.num_deny_groups > 0 || options.num_allow_groups > 0) {
hostname = auth_get_canonical_hostname(ssh, options.use_dns);
ipaddr = ssh_remote_ipaddr(ssh);
}
/* Return false if user is listed in DenyUsers */
if (options.num_deny_users > 0) {
for (i = 0; i < options.num_deny_users; i++) {
r = match_user(pw->pw_name, hostname, ipaddr,
options.deny_users[i]);
if (r < 0) {
fatal("Invalid DenyUsers pattern \"%.100s\"",
options.deny_users[i]);
} else if (r != 0) {
logit("User %.100s from %.100s not allowed "
"because listed in DenyUsers",
pw->pw_name, hostname);
return 0;
}
}
}
/* Return false if AllowUsers isn't empty and user isn't listed there */
if (options.num_allow_users > 0) {
for (i = 0; i < options.num_allow_users; i++) {
r = match_user(pw->pw_name, hostname, ipaddr,
options.allow_users[i]);
if (r < 0) {
fatal("Invalid AllowUsers pattern \"%.100s\"",
options.allow_users[i]);
} else if (r == 1)
break;
}
/* i < options.num_allow_users iff we break for loop */
if (i >= options.num_allow_users) {
logit("User %.100s from %.100s not allowed because "
"not listed in AllowUsers", pw->pw_name, hostname);
return 0;
}
}
if (options.num_deny_groups > 0 || options.num_allow_groups > 0) {
/* Get the user's group access list (primary and supplementary) */
if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
logit("User %.100s from %.100s not allowed because "
"not in any group", pw->pw_name, hostname);
return 0;
}
/* Return false if one of user's groups is listed in DenyGroups */
if (options.num_deny_groups > 0)
if (ga_match(options.deny_groups,
options.num_deny_groups)) {
ga_free();
logit("User %.100s from %.100s not allowed "
"because a group is listed in DenyGroups",
pw->pw_name, hostname);
return 0;
}
/*
* Return false if AllowGroups isn't empty and one of user's groups
* isn't listed there
*/
if (options.num_allow_groups > 0)
if (!ga_match(options.allow_groups,
options.num_allow_groups)) {
ga_free();
logit("User %.100s from %.100s not allowed "
"because none of user's groups are listed "
"in AllowGroups", pw->pw_name, hostname);
return 0;
}
ga_free();
}
/* We found no reason not to let this user try to log on... */
return 1;
}
/*
* Check if the user is allowed to log in via ssh. If user is listed
* in DenyUsers or one of user's groups is listed in DenyGroups, false
* will be returned. If AllowUsers isn't empty and user isn't listed
* there, or if AllowGroups isn't empty and one of user's groups isn't
* listed there, false will be returned.
* If the user's shell is not executable, false will be returned.
* Otherwise true is returned.
*/
int
allowed_user(struct passwd * pw)
{
struct stat st;
const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL;
char *shell;
int i;
#ifdef USE_SHADOW
struct spwd *spw = NULL;
#endif
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
if (!pw || !pw->pw_name)
return 0;
#ifdef USE_SHADOW
if (!options.use_pam)
spw = getspnam(pw->pw_name);
#ifdef HAS_SHADOW_EXPIRE
if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw))
return 0;
#endif /* HAS_SHADOW_EXPIRE */
#endif /* USE_SHADOW */
/* grab passwd field for locked account check */
#ifdef USE_SHADOW
if (spw != NULL)
passwd = spw->sp_pwdp;
#else
passwd = pw->pw_passwd;
#endif
/* check for locked account */
if (!options.use_pam && passwd && *passwd) {
int locked = 0;
#ifdef LOCKED_PASSWD_STRING
if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0)
locked = 1;
#endif
#ifdef LOCKED_PASSWD_PREFIX
if (strncmp(passwd, LOCKED_PASSWD_PREFIX,
strlen(LOCKED_PASSWD_PREFIX)) == 0)
locked = 1;
#endif
#ifdef LOCKED_PASSWD_SUBSTR
if (strstr(passwd, LOCKED_PASSWD_SUBSTR))
locked = 1;
#endif
if (locked) {
logit("User %.100s not allowed because account is locked",
pw->pw_name);
return 0;
}
}
/*
* 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;
/* deny if shell does not exists or is not executable */
if (stat(shell, &st) != 0) {
logit("User %.100s not allowed because shell %.100s does not exist",
pw->pw_name, shell);
return 0;
}
if (S_ISREG(st.st_mode) == 0 ||
(st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) {
logit("User %.100s not allowed because shell %.100s is not executable",
pw->pw_name, shell);
return 0;
}
if (options.num_deny_users > 0 || options.num_allow_users > 0) {
hostname = get_canonical_hostname(options.use_dns);
ipaddr = get_remote_ipaddr();
}
/* Return false if user is listed in DenyUsers */
if (options.num_deny_users > 0) {
for (i = 0; i < options.num_deny_users; i++)
if (match_user(pw->pw_name, hostname, ipaddr,
options.deny_users[i])) {
logit("User %.100s not allowed because listed in DenyUsers",
pw->pw_name);
return 0;
}
}
/* Return false if AllowUsers isn't empty and user isn't listed there */
if (options.num_allow_users > 0) {
for (i = 0; i < options.num_allow_users; i++)
if (match_user(pw->pw_name, hostname, ipaddr,
options.allow_users[i]))
break;
/* i < options.num_allow_users iff we break for loop */
if (i >= options.num_allow_users) {
logit("User %.100s not allowed because not listed in AllowUsers",
pw->pw_name);
return 0;
}
}
if (options.num_deny_groups > 0 || options.num_allow_groups > 0) {
/* Get the user's group access list (primary and supplementary) */
if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
logit("User %.100s not allowed because not in any group",
pw->pw_name);
return 0;
}
/* Return false if one of user's groups is listed in DenyGroups */
if (options.num_deny_groups > 0)
if (ga_match(options.deny_groups,
options.num_deny_groups)) {
ga_free();
logit("User %.100s not allowed because a group is listed in DenyGroups",
pw->pw_name);
return 0;
}
/*
* Return false if AllowGroups isn't empty and one of user's groups
* isn't listed there
*/
if (options.num_allow_groups > 0)
if (!ga_match(options.allow_groups,
options.num_allow_groups)) {
ga_free();
logit("User %.100s not allowed because none of user's groups are listed in AllowGroups",
pw->pw_name);
return 0;
}
ga_free();
}
#ifdef WITH_AIXAUTHENTICATE
/*
* Don't check loginrestrictions() for root account (use
* PermitRootLogin to control logins via ssh), or if running as
* non-root user (since loginrestrictions will always fail).
*/
if ((pw->pw_uid != 0) && (geteuid() == 0)) {
char *msg;
if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg) != 0) {
int loginrestrict_errno = errno;
if (msg && *msg) {
buffer_append(&loginmsg, msg, strlen(msg));
aix_remove_embedded_newlines(msg);
logit("Login restricted for %s: %.100s",
pw->pw_name, msg);
}
/* Don't fail if /etc/nologin set */
if (!(loginrestrict_errno == EPERM &&
stat(_PATH_NOLOGIN, &st) == 0))
return 0;
}
}
#endif /* WITH_AIXAUTHENTICATE */
/* We found no reason not to let this user try to log on... */
return 1;
}
/*
* Check if the user is allowed to log in via ssh. If user is listed
* in DenyUsers or one of user's groups is listed in DenyGroups, false
* will be returned. If AllowUsers isn't empty and user isn't listed
* there, or if AllowGroups isn't empty and one of user's groups isn't
* listed there, false will be returned.
* If the user's shell is not executable, false will be returned.
* Otherwise true is returned.
*/
int
allowed_user(struct passwd * pw)
{
struct stat st;
const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL;
u_int i;
#ifdef USE_SHADOW
struct spwd *spw = NULL;
#endif
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
if (!pw || !pw->pw_name)
return 0;
#ifdef USE_SHADOW
if (!options.use_pam)
spw = getspnam(pw->pw_name);
#ifdef HAS_SHADOW_EXPIRE
if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw))
return 0;
#endif /* HAS_SHADOW_EXPIRE */
#endif /* USE_SHADOW */
/* grab passwd field for locked account check */
passwd = pw->pw_passwd;
#ifdef USE_SHADOW
if (spw != NULL)
#ifdef USE_LIBIAF
passwd = get_iaf_password(pw);
#else
passwd = spw->sp_pwdp;
#endif /* USE_LIBIAF */
#endif
/* check for locked account */
if (!options.use_pam && passwd && *passwd) {
int locked = 0;
#ifdef LOCKED_PASSWD_STRING
if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0)
locked = 1;
#endif
#ifdef LOCKED_PASSWD_PREFIX
if (strncmp(passwd, LOCKED_PASSWD_PREFIX,
strlen(LOCKED_PASSWD_PREFIX)) == 0)
locked = 1;
#endif
#ifdef LOCKED_PASSWD_SUBSTR
if (strstr(passwd, LOCKED_PASSWD_SUBSTR))
locked = 1;
#endif
#ifdef USE_LIBIAF
free((void *) passwd);
#endif /* USE_LIBIAF */
if (locked) {
logit("User %.100s not allowed because account is locked",
pw->pw_name);
return 0;
}
}
/*
* Deny if shell does not exist or is not executable unless we
* are chrooting.
*/
if (options.chroot_directory == NULL ||
strcasecmp(options.chroot_directory, "none") == 0) {
char *shell = xstrdup((pw->pw_shell[0] == '\0') ?
_PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */
if (stat(shell, &st) != 0) {
logit("User %.100s not allowed because shell %.100s "
"does not exist", pw->pw_name, shell);
xfree(shell);
return 0;
}
if (S_ISREG(st.st_mode) == 0 ||
(st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) {
logit("User %.100s not allowed because shell %.100s "
"is not executable", pw->pw_name, shell);
xfree(shell);
return 0;
}
xfree(shell);
}
if (options.num_deny_users > 0 || options.num_allow_users > 0 ||
options.num_deny_groups > 0 || options.num_allow_groups > 0) {
hostname = get_canonical_hostname(options.use_dns);
ipaddr = get_remote_ipaddr();
}
/* Return false if user is listed in DenyUsers */
if (options.num_deny_users > 0) {
for (i = 0; i < options.num_deny_users; i++)
if (match_user(pw->pw_name, hostname, ipaddr,
options.deny_users[i])) {
logit("User %.100s from %.100s not allowed "
"because listed in DenyUsers",
pw->pw_name, hostname);
return 0;
}
}
/* Return false if AllowUsers isn't empty and user isn't listed there */
if (options.num_allow_users > 0) {
for (i = 0; i < options.num_allow_users; i++)
if (match_user(pw->pw_name, hostname, ipaddr,
options.allow_users[i]))
break;
/* i < options.num_allow_users iff we break for loop */
if (i >= options.num_allow_users) {
logit("User %.100s from %.100s not allowed because "
"not listed in AllowUsers", pw->pw_name, hostname);
return 0;
}
}
if (options.num_deny_groups > 0 || options.num_allow_groups > 0) {
/* Get the user's group access list (primary and supplementary) */
if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
logit("User %.100s from %.100s not allowed because "
"not in any group", pw->pw_name, hostname);
return 0;
}
/* Return false if one of user's groups is listed in DenyGroups */
if (options.num_deny_groups > 0)
if (ga_match(options.deny_groups,
options.num_deny_groups)) {
ga_free();
logit("User %.100s from %.100s not allowed "
"because a group is listed in DenyGroups",
pw->pw_name, hostname);
return 0;
}
/*
* Return false if AllowGroups isn't empty and one of user's groups
* isn't listed there
*/
if (options.num_allow_groups > 0)
if (!ga_match(options.allow_groups,
options.num_allow_groups)) {
ga_free();
logit("User %.100s from %.100s not allowed "
"because none of user's groups are listed "
"in AllowGroups", pw->pw_name, hostname);
return 0;
}
ga_free();
}
#ifdef CUSTOM_SYS_AUTH_ALLOWED_USER
if (!sys_auth_allowed_user(pw, &loginmsg))
return 0;
#endif
/* We found no reason not to let this user try to log on... */
return 1;
}
/*
* Check if the user is allowed to log in via ssh. If user is listed
* in DenyUsers or one of user's groups is listed in DenyGroups, false
* will be returned. If AllowUsers isn't empty and user isn't listed
* there, or if AllowGroups isn't empty and one of user's groups isn't
* listed there, false will be returned.
* If the user's shell is not executable, false will be returned.
* Otherwise true is returned.
*/
int
allowed_user(struct passwd * pw)
{
struct stat st;
const char *hostname = NULL, *ipaddr = NULL;
char *shell;
int i;
#ifdef WITH_AIXAUTHENTICATE
char *loginmsg;
#endif /* WITH_AIXAUTHENTICATE */
#if !defined(USE_PAM) && defined(HAVE_SHADOW_H) && \
!defined(DISABLE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
struct spwd *spw;
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
if (!pw || !pw->pw_name)
return 0;
#define DAY (24L * 60 * 60) /* 1 day in seconds */
spw = getspnam(pw->pw_name);
if (spw != NULL) {
time_t today = time(NULL) / DAY;
debug3("allowed_user: today %d sp_expire %d sp_lstchg %d"
" sp_max %d", (int)today, (int)spw->sp_expire,
(int)spw->sp_lstchg, (int)spw->sp_max);
/*
* We assume account and password expiration occurs the
* day after the day specified.
*/
if (spw->sp_expire != -1 && today > spw->sp_expire) {
log("Account %.100s has expired", pw->pw_name);
return 0;
}
if (spw->sp_lstchg == 0) {
log("User %.100s password has expired (root forced)",
pw->pw_name);
return 0;
}
if (spw->sp_max != -1 &&
today > spw->sp_lstchg + spw->sp_max) {
log("User %.100s password has expired (password aged)",
pw->pw_name);
return 0;
}
}
#else
/* Shouldn't be called if pw is NULL, but better safe than sorry... */
if (!pw || !pw->pw_name)
return 0;
#endif
/*
* 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;
/* deny if shell does not exists or is not executable */
if (stat(shell, &st) != 0) {
log("User %.100s not allowed because shell %.100s does not exist",
pw->pw_name, shell);
return 0;
}
if (S_ISREG(st.st_mode) == 0 ||
(st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) {
log("User %.100s not allowed because shell %.100s is not executable",
pw->pw_name, shell);
return 0;
}
if (options.num_deny_users > 0 || options.num_allow_users > 0) {
hostname = get_canonical_hostname(options.verify_reverse_mapping);
ipaddr = get_remote_ipaddr();
}
/* Return false if user is listed in DenyUsers */
if (options.num_deny_users > 0) {
for (i = 0; i < options.num_deny_users; i++)
if (match_user(pw->pw_name, hostname, ipaddr,
options.deny_users[i])) {
log("User %.100s not allowed because listed in DenyUsers",
pw->pw_name);
return 0;
}
}
/* Return false if AllowUsers isn't empty and user isn't listed there */
if (options.num_allow_users > 0) {
for (i = 0; i < options.num_allow_users; i++)
if (match_user(pw->pw_name, hostname, ipaddr,
options.allow_users[i]))
break;
/* i < options.num_allow_users iff we break for loop */
if (i >= options.num_allow_users) {
log("User %.100s not allowed because not listed in AllowUsers",
pw->pw_name);
return 0;
}
}
if (options.num_deny_groups > 0 || options.num_allow_groups > 0) {
/* Get the user's group access list (primary and supplementary) */
if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
log("User %.100s not allowed because not in any group",
pw->pw_name);
return 0;
}
/* Return false if one of user's groups is listed in DenyGroups */
if (options.num_deny_groups > 0)
if (ga_match(options.deny_groups,
options.num_deny_groups)) {
ga_free();
log("User %.100s not allowed because a group is listed in DenyGroups",
pw->pw_name);
return 0;
}
/*
* Return false if AllowGroups isn't empty and one of user's groups
* isn't listed there
*/
if (options.num_allow_groups > 0)
if (!ga_match(options.allow_groups,
options.num_allow_groups)) {
ga_free();
log("User %.100s not allowed because none of user's groups are listed in AllowGroups",
pw->pw_name);
return 0;
}
ga_free();
}
#ifdef WITH_AIXAUTHENTICATE
if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &loginmsg) != 0) {
if (loginmsg && *loginmsg) {
/* Remove embedded newlines (if any) */
char *p;
for (p = loginmsg; *p; p++) {
if (*p == '\n')
*p = ' ';
}
/* Remove trailing newline */
*--p = '\0';
log("Login restricted for %s: %.100s", pw->pw_name, loginmsg);
}
return 0;
}
#endif /* WITH_AIXAUTHENTICATE */
/* We found no reason not to let this user try to log on... */
return 1;
}
