/*
* Get a password entry by uid and allocate space for it.
*/
struct passwd *
sudo_getpwuid(uid_t uid)
{
struct cache_item key, *item;
struct rbnode *node;
debug_decl(sudo_getpwuid, SUDO_DEBUG_NSS)
key.k.uid = uid;
if ((node = rbfind(pwcache_byuid, &key)) != NULL) {
item = (struct cache_item *) node->data;
goto done;
}
/*
* Cache passwd db entry if it exists or a negative response if not.
*/
#ifdef HAVE_SETAUTHDB
aix_setauthdb(IDtouser(uid));
#endif
item = sudo_make_pwitem(uid, NULL);
if (item == NULL) {
item = ecalloc(1, sizeof(*item));
item->refcnt = 1;
item->k.uid = uid;
/* item->d.pw = NULL; */
}
if (rbinsert(pwcache_byuid, item) != NULL)
fatalx(_("unable to cache uid %u, already exists"),
(unsigned int) uid);
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
done:
item->refcnt++;
debug_return_ptr(item->d.pw);
}
/*
* Do authentication via AIX's authenticate routine. We loop until the
* reenter parameter is 0, but normally authenticate is called only once.
*
* Note: this function returns 1 on success, whereas AIX's authenticate()
* returns 0.
*/
int
sys_auth_passwd(Authctxt *ctxt, const char *password)
{
char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
int authsuccess = 0, expired, reenter, result;
do {
result = authenticate((char *)name, (char *)password, &reenter,
&authmsg);
aix_remove_embedded_newlines(authmsg);
debug3("AIX/authenticate result %d, authmsg %.100s", result,
authmsg);
} while (reenter);
if (!aix_valid_authentications(name))
result = -1;
if (result == 0) {
authsuccess = 1;
/*
* Record successful login. We don't have a pty yet, so just
* label the line as "ssh"
*/
aix_setauthdb(name);
/*
* Check if the user's password is expired.
*/
expired = passwdexpired(name, &msg);
if (msg && *msg) {
buffer_append(ctxt->loginmsg, msg, strlen(msg));
aix_remove_embedded_newlines(msg);
}
debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);
switch (expired) {
case 0: /* password not expired */
break;
case 1: /* expired, password change required */
ctxt->force_pwchange = 1;
break;
default: /* user can't change(2) or other error (-1) */
logit("Password can't be changed for user %s: %.100s",
name, msg);
if (msg)
xfree(msg);
authsuccess = 0;
}
aix_restoreauthdb();
}
if (authmsg != NULL)
xfree(authmsg);
return authsuccess;
}
/*
* record_failed_login: generic "login failed" interface function
*/
void
record_failed_login(const char *user, const char *ttyname)
{
char *hostname = get_canonical_hostname(options.use_dns);
if (geteuid() != 0)
return;
aix_setauthdb(user);
# ifdef AIX_LOGINFAILED_4ARG
loginfailed((char *)user, hostname, (char *)ttyname, AUDIT_FAIL_AUTH);
# else
loginfailed((char *)user, hostname, (char *)ttyname);
# endif
}
/*
* record_failed_login: generic "login failed" interface function
*/
void
record_failed_login(const char *user, const char *hostname, const char *ttyname)
{
if (geteuid() != 0)
return;
aix_setauthdb(user);
# ifdef AIX_LOGINFAILED_4ARG
loginfailed((char *)user, (char *)hostname, (char *)ttyname,
AUDIT_FAIL_AUTH);
# else
loginfailed((char *)user, (char *)hostname, (char *)ttyname);
# endif
aix_restoreauthdb();
}
int
sys_auth_record_login(const char *user, const char *host, const char *ttynm)
{
char *msg;
int success = 0;
aix_setauthdb(user);
if (loginsuccess((char *)user, host, ttynm, &msg) == 0) {
success = 1;
if (msg != NULL) {
debug("AIX/loginsuccess: msg %s", __func__, msg);
buffer_append(&loginmsg, msg, strlen(msg));
xfree(msg);
}
}
aix_restoreauthdb();
return (success);
}
int
sys_auth_record_login(const char *user, const char *host, const char *ttynm,
Buffer *loginmsg)
{
char *msg = NULL;
int success = 0;
aix_setauthdb(user);
if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
success = 1;
if (msg != NULL) {
debug("AIX/loginsuccess: msg %s", msg);
if (lastlogin_msg == NULL)
lastlogin_msg = msg;
}
}
aix_restoreauthdb();
return (success);
}
int
sys_auth_record_login(const char *user, const char *host, const char *ttynm,
Buffer *loginmsg)
{
char *msg = NULL;
static int msg_done = 0;
int success = 0;
aix_setauthdb(user);
if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
success = 1;
if (msg != NULL && loginmsg != NULL && !msg_done) {
debug("AIX/loginsuccess: msg %s", msg);
buffer_append(loginmsg, msg, strlen(msg));
xfree(msg);
msg_done = 1;
}
}
aix_restoreauthdb();
return (success);
}
/*
* Get a password entry by name and allocate space for it.
*/
struct passwd *
sudo_getpwnam(const char *name)
{
struct cache_item key, *item;
struct rbnode *node;
size_t len;
debug_decl(sudo_getpwnam, SUDO_DEBUG_NSS)
key.k.name = (char *) name;
if ((node = rbfind(pwcache_byname, &key)) != NULL) {
item = (struct cache_item *) node->data;
goto done;
}
/*
* Cache passwd db entry if it exists or a negative response if not.
*/
#ifdef HAVE_SETAUTHDB
aix_setauthdb((char *) name);
#endif
if ((key.d.pw = getpwnam(name)) != NULL) {
item = make_pwitem(key.d.pw, name);
if (rbinsert(pwcache_byname, item) != NULL)
errorx(1, _("unable to cache user %s, already exists"), name);
} else {
len = strlen(name) + 1;
item = ecalloc(1, sizeof(*item) + len);
item->refcnt = 1;
item->k.name = (char *) item + sizeof(*item);
memcpy(item->k.name, name, len);
/* item->d.pw = NULL; */
if (rbinsert(pwcache_byname, item) != NULL)
errorx(1, _("unable to cache user %s, already exists"), name);
}
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
done:
item->refcnt++;
debug_return_ptr(item->d.pw);
}
/*
* BSD-compatible getgrouplist(3) using getgrset(3)
*/
int
getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroupsp)
{
char *cp, *grset = NULL;
int i, ngroups = 1;
int grpsize = *ngroupsp;
int rval = -1;
gid_t gid;
/* We support BSD semantics where the first element is the base gid */
if (grpsize <= 0)
return -1;
groups[0] = basegid;
#ifdef HAVE_SETAUTHDB
aix_setauthdb((char *) name);
#endif
if ((grset = getgrset(name)) != NULL) {
const char *errstr;
for (cp = strtok(grset, ","); cp != NULL; cp = strtok(NULL, ",")) {
gid = atoid(cp, NULL, NULL, &errstr);
if (errstr == NULL && gid != basegid) {
if (ngroups == grpsize)
goto done;
groups[ngroups++] = gid;
}
}
}
rval = 0;
done:
free(grset);
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
*ngroupsp = ngroups;
return rval;
}
/*
* Get a password entry by uid and allocate space for it.
* Fills in pw_passwd from shadow file if necessary.
*/
struct passwd *
sudo_getpwuid(uid_t uid)
{
struct cache_item key, *item;
struct rbnode *node;
key.k.uid = uid;
if ((node = rbfind(pwcache_byuid, &key)) != NULL) {
item = (struct cache_item *) node->data;
goto done;
}
/*
* Cache passwd db entry if it exists or a negative response if not.
*/
#ifdef HAVE_SETAUTHDB
aix_setauthdb(IDtouser(uid));
#endif
if ((key.d.pw = getpwuid(uid)) != NULL) {
item = make_pwitem(key.d.pw, NULL);
if (rbinsert(pwcache_byuid, item) != NULL)
errorx(1, "unable to cache uid %u (%s), already exists",
(unsigned int) uid, item->d.pw->pw_name);
} else {
item = emalloc(sizeof(*item));
item->refcnt = 1;
item->k.uid = uid;
item->d.pw = NULL;
if (rbinsert(pwcache_byuid, item) != NULL)
errorx(1, "unable to cache uid %u, already exists",
(unsigned int) uid);
}
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
done:
item->refcnt++;
return item->d.pw;
}
/* Reset user_groups based on passwd entry. */
static void
reset_groups(struct passwd *pw)
{
#if defined(HAVE_INITGROUPS) && defined(HAVE_GETGROUPS)
if (pw != sudo_user.pw) {
# ifdef HAVE_SETAUTHDB
aix_setauthdb(pw->pw_name);
# endif
if (initgroups(pw->pw_name, pw->pw_gid) == -1)
log_error(USE_ERRNO|MSG_ONLY, "can't reset group vector");
efree(user_groups);
user_groups = NULL;
if ((user_ngroups = getgroups(0, NULL)) > 0) {
user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
if (getgroups(user_ngroups, user_groups) < 0)
log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
}
# ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
# endif
}
#endif
}
struct passwd *
getpwnamallow(const char *user)
{
#ifdef HAVE_LOGIN_CAP
extern login_cap_t *lc;
#ifdef BSD_AUTH
auth_session_t *as;
#endif
#endif
struct passwd *pw;
parse_server_match_config(&options, user,
get_canonical_hostname(options.use_dns), get_remote_ipaddr());
#if defined(_AIX) && defined(HAVE_SETAUTHDB)
aix_setauthdb(user);
#endif
pw = getpwnam(user);
#if defined(_AIX) && defined(HAVE_SETAUTHDB)
aix_restoreauthdb();
#endif
#ifdef HAVE_CYGWIN
/*
* Windows usernames are case-insensitive. To avoid later problems
* when trying to match the username, the user is only allowed to
* login if the username is given in the same case as stored in the
* user database.
*/
if (pw != NULL && strcmp(user, pw->pw_name) != 0) {
logit("Login name %.100s does not match stored username %.100s",
user, pw->pw_name);
pw = NULL;
}
#endif
if (pw == NULL) {
logit("Invalid user %.100s from %.100s",
user, get_remote_ipaddr());
#ifdef CUSTOM_FAILED_LOGIN
record_failed_login(user,
get_canonical_hostname(options.use_dns), "ssh");
#endif
#ifdef SSH_AUDIT_EVENTS
audit_event(SSH_INVALID_USER);
#endif /* SSH_AUDIT_EVENTS */
return (NULL);
}
if (!allowed_user(pw))
return (NULL);
#ifdef HAVE_LOGIN_CAP
if ((lc = login_getclass(pw->pw_class)) == NULL) {
debug("unable to get login class: %s", user);
return (NULL);
}
#ifdef BSD_AUTH
if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 ||
auth_approval(as, lc, pw->pw_name, "ssh") <= 0) {
debug("Approval failure for %s", user);
pw = NULL;
}
if (as != NULL)
auth_close(as);
#endif
#endif
if (pw != NULL)
return (pwcopy(pw));
return (NULL);
}
int
user_in_group(struct passwd *pw, const char *group)
{
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
uuid_t gu, uu;
int ismember;
#else
char **gr_mem;
int i;
#endif
struct group *grp;
int retval = FALSE;
#ifdef HAVE_SETAUTHDB
aix_setauthdb(pw->pw_name);
#endif
grp = sudo_getgrnam(group);
#ifdef HAVE_SETAUTHDB
aix_restoreauthdb();
#endif
if (grp == NULL)
goto done;
/* check against user's primary (passwd file) gid */
if (grp->gr_gid == pw->pw_gid) {
retval = TRUE;
goto done;
}
#ifdef HAVE_MBR_CHECK_MEMBERSHIP
/* If we are matching the invoking user use the stashed uuid. */
if (strcmp(pw->pw_name, user_name) == 0) {
if (mbr_gid_to_uuid(grp->gr_gid, gu) == 0 &&
mbr_check_membership(user_uuid, gu, &ismember) == 0 && ismember) {
retval = TRUE;
goto done;
}
} else {
if (mbr_uid_to_uuid(pw->pw_uid, uu) == 0 &&
mbr_gid_to_uuid(grp->gr_gid, gu) == 0 &&
mbr_check_membership(uu, gu, &ismember) == 0 && ismember) {
retval = TRUE;
goto done;
}
}
#else /* HAVE_MBR_CHECK_MEMBERSHIP */
# ifdef HAVE_GETGROUPS
/*
* If we are matching the invoking or list user and that user has a
* supplementary group vector, check it.
*/
if (user_ngroups > 0 &&
strcmp(pw->pw_name, list_pw ? list_pw->pw_name : user_name) == 0) {
for (i = 0; i < user_ngroups; i++) {
if (grp->gr_gid == user_groups[i]) {
retval = TRUE;
goto done;
}
}
} else
# endif /* HAVE_GETGROUPS */
{
if (grp != NULL && grp->gr_mem != NULL) {
for (gr_mem = grp->gr_mem; *gr_mem; gr_mem++) {
if (strcmp(*gr_mem, pw->pw_name) == 0) {
retval = TRUE;
goto done;
}
}
}
}
#endif /* HAVE_MBR_CHECK_MEMBERSHIP */
done:
if (grp != NULL)
gr_delref(grp);
return retval;
}
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int
auth_password(Authctxt *authctxt, const char *password)
{
struct passwd * pw = authctxt->pw;
int ok = authctxt->valid;
/* deny if no user. */
if (pw == NULL)
return 0;
#ifndef HAVE_CYGWIN
if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
ok = 0;
#endif
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
#if defined(HAVE_OSF_SIA)
return auth_sia_password(authctxt, password) && ok;
#else
# ifdef KRB5
if (options.kerberos_authentication == 1) {
int ret = auth_krb5_password(authctxt, password);
if (ret == 1 || ret == 0)
return ret && ok;
/* Fall back to ordinary passwd authentication. */
}
# endif
# ifdef HAVE_CYGWIN
if (is_winnt) {
HANDLE hToken = cygwin_logon_user(pw, password);
if (hToken == INVALID_HANDLE_VALUE)
return 0;
cygwin_set_impersonation_token(hToken);
return ok;
}
# endif
# ifdef WITH_AIXAUTHENTICATE
{
char *authmsg = NULL;
int reenter = 1;
int authsuccess = 0;
if (authenticate(pw->pw_name, password, &reenter,
&authmsg) == 0 && ok) {
char *msg;
char *host =
(char *)get_canonical_hostname(options.use_dns);
authsuccess = 1;
aix_remove_embedded_newlines(authmsg);
debug3("AIX/authenticate succeeded for user %s: %.100s",
pw->pw_name, authmsg);
/* No pty yet, so just label the line as "ssh" */
aix_setauthdb(authctxt->user);
if (loginsuccess(authctxt->user, host, "ssh",
&msg) == 0) {
if (msg != NULL) {
debug("%s: msg %s", __func__, msg);
buffer_append(&loginmsg, msg,
strlen(msg));
xfree(msg);
}
}
} else {
debug3("AIX/authenticate failed for user %s: %.100s",
pw->pw_name, authmsg);
}
if (authmsg != NULL)
xfree(authmsg);
return authsuccess;
}
# endif
# ifdef BSD_AUTH
if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
(char *)password) == 0)
return 0;
else
return ok;
# else
{
/* Just use the supplied fake password if authctxt is invalid */
char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;
/* Check for users with no password. */
if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
return ok;
else {
/* Encrypt the candidate password using the proper salt. */
char *encrypted_password = xcrypt(password,
(pw_password[0] && pw_password[1]) ? pw_password : "******");
/*
* Authentication is accepted if the encrypted passwords
* are identical.
*/
return (strcmp(encrypted_password, pw_password) == 0) && ok;
}
}
# endif
#endif /* !HAVE_OSF_SIA */
}
