krb5_child.c revision 83011d97d17bd00e99ccf1e0302167a6bc0db84e
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder/*
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder SSSD
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder Kerberos 5 Backend Module -- tgt_req and changepw child
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder Authors:
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder Sumit Bose <sbose@redhat.com>
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder Copyright (C) 2009-2010 Red Hat
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder This program is free software; you can redistribute it and/or modify
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder it under the terms of the GNU General Public License as published by
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder the Free Software Foundation; either version 3 of the License, or
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder (at your option) any later version.
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder This program is distributed in the hope that it will be useful,
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder but WITHOUT ANY WARRANTY; without even the implied warranty of
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder GNU General Public License for more details.
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder You should have received a copy of the GNU General Public License
df0e8744a2befcba003ea6d93214601c743bde74Christian Maeder along with this program. If not, see <http://www.gnu.org/licenses/>.
df0e8744a2befcba003ea6d93214601c743bde74Christian Maeder*/
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder#include <sys/types.h>
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#include <unistd.h>
df0e8744a2befcba003ea6d93214601c743bde74Christian Maeder#include <sys/stat.h>
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder#include <popt.h>
b8cd2804f426fd97148615fe31c1f47afac7a683Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#include <security/pam_modules.h>
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#include "util/util.h"
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#include "util/sss_krb5.h"
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#include "util/user_info_msg.h"
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder#include "util/child_common.h"
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder#include "providers/dp_backend.h"
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#include "providers/krb5/krb5_auth.h"
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder#include "providers/krb5/krb5_utils.h"
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder#include "sss_cli.h"
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder#define SSSD_KRB5_CHANGEPW_PRINCIPAL "kadmin/changepw"
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder
df0e8744a2befcba003ea6d93214601c743bde74Christian Maederstruct krb5_req {
df0e8744a2befcba003ea6d93214601c743bde74Christian Maeder krb5_context ctx;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_principal princ;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder char* name;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_creds *creds;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder krb5_get_init_creds_opt *options;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder struct pam_data *pd;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder char *realm;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder char *ccname;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder char *keytab;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder bool validate;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder bool send_pac;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder bool use_enterprise_princ;
b8cd2804f426fd97148615fe31c1f47afac7a683Christian Maeder char *fast_ccname;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder const char *upn;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder uid_t uid;
b8cd2804f426fd97148615fe31c1f47afac7a683Christian Maeder gid_t gid;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder};
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maederstatic krb5_context krb5_error_ctx;
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder#define KRB5_CHILD_DEBUG(level, error) KRB5_DEBUG(level, krb5_error_ctx, error)
59bbf8aeab565e86d79c8482a4c7bd7a1841ca7bChristian Maeder
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maederstatic krb5_error_code get_changepw_options(krb5_context ctx,
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_get_init_creds_opt **_options)
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder{
b8cd2804f426fd97148615fe31c1f47afac7a683Christian Maeder krb5_get_init_creds_opt *options;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_error_code kerr;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder kerr = sss_krb5_get_init_creds_opt_alloc(ctx, &options);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder if (kerr != 0) {
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder return kerr;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder }
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder sss_krb5_get_init_creds_opt_set_canonicalize(options, 0);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_get_init_creds_opt_set_forwardable(options, 0);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_get_init_creds_opt_set_proxiable(options, 0);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_get_init_creds_opt_set_renew_life(options, 0);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_get_init_creds_opt_set_tkt_life(options, 5*60);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder *_options = options;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder return 0;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder}
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maederstatic errno_t sss_send_pac(krb5_authdata **pac_authdata)
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder{
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder struct sss_cli_req_data sss_data;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder int ret;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder int errnop;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder sss_data.len = pac_authdata[0]->length;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder sss_data.data = pac_authdata[0]->contents;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder ret = sss_pac_make_request(SSS_PAC_ADD_PAC_USER, &sss_data,
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder NULL, NULL, &errnop);
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder if (ret != NSS_STATUS_SUCCESS || errnop != 0) {
b8cd2804f426fd97148615fe31c1f47afac7a683Christian Maeder DEBUG(SSSDBG_OP_FAILURE, ("sss_pac_make_request failed [%d][%d].\n",
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder ret, errnop));
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder return EIO;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder }
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder return EOK;
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder}
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maederstatic void sss_krb5_expire_callback_func(krb5_context context, void *data,
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_timestamp password_expiration,
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_timestamp account_expiration,
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder krb5_boolean is_last_req)
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder{
863c98ae89e37c21c0c04b9b130b5136688976eeChristian Maeder int ret;
46b207daf66b64930a59f3615c8b127aac0b8e43Christian Maeder uint32_t *blob;
long exp_time;
struct krb5_req *kr = talloc_get_type(data, struct krb5_req);
if (password_expiration == 0) {
return;
}
exp_time = password_expiration - time(NULL);
if (exp_time < 0 || exp_time > UINT32_MAX) {
DEBUG(1, ("Time to expire out of range.\n"));
return;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("exp_time: [%ld]\n", exp_time));
blob = talloc_array(kr->pd, uint32_t, 2);
if (blob == NULL) {
DEBUG(1, ("talloc_size failed.\n"));
return;
}
blob[0] = SSS_PAM_USER_INFO_EXPIRE_WARN;
blob[1] = (uint32_t) exp_time;
ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, 2 * sizeof(uint32_t),
(uint8_t *) blob);
if (ret != EOK) {
DEBUG(1, ("pam_add_response failed.\n"));
}
return;
}
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_RESPONDER
/*
* TODO: These features generally would requires a significant refactoring
* of SSSD and MIT krb5 doesn't support them anyway. They are listed here
* simply as a reminder of things that might become future feature potential.
*
* 1. tokeninfo selection
* 2. challenge
* 3. discreet token/pin prompting
* 4. interactive otp format correction
* 5. nextOTP
*
*/
typedef int (*checker)(int c);
static inline checker pick_checker(int format)
{
switch (format) {
case KRB5_RESPONDER_OTP_FORMAT_DECIMAL:
return isdigit;
case KRB5_RESPONDER_OTP_FORMAT_HEXADECIMAL:
return isxdigit;
case KRB5_RESPONDER_OTP_FORMAT_ALPHANUMERIC:
return isalnum;
}
return NULL;
}
static int token_pin_destructor(char *mem)
{
safezero(mem, strlen(mem));
return 0;
}
static krb5_error_code tokeninfo_matches(TALLOC_CTX *mem_ctx,
const krb5_responder_otp_tokeninfo *ti,
const char *pwd, size_t len,
char **out_token, char **out_pin)
{
char *token = NULL, *pin = NULL;
checker check = NULL;
int i;
if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_NEXTOTP) {
return ENOTSUP;
}
if (ti->challenge != NULL) {
return ENOTSUP;
}
/* This is a non-sensical value. */
if (ti->length == 0) {
return EPROTO;
}
if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_COLLECT_TOKEN) {
/* ASSUMPTION: authtok has one of the following formats:
* 1. TokenValue
* 2. PIN+TokenValue
*/
token = talloc_strndup(mem_ctx, pwd, len);
if (token == NULL) {
return ENOMEM;
}
talloc_set_destructor(token, token_pin_destructor);
if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_COLLECT_PIN) {
/* If the server desires a separate pin, we will split it.
* ASSUMPTION: Format of authtok is PIN+TokenValue. */
if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_SEPARATE_PIN) {
if (ti->length < 1) {
talloc_free(token);
return ENOTSUP;
}
if (ti->length >= len) {
talloc_free(token);
return EMSGSIZE;
}
/* Copy the PIN from the front of the value. */
pin = talloc_strndup(NULL, pwd, len - ti->length);
if (pin == NULL) {
talloc_free(token);
return ENOMEM;
}
talloc_set_destructor(pin, token_pin_destructor);
/* Remove the PIN from the front of the token value. */
memmove(token, token + len - ti->length, ti->length + 1);
check = pick_checker(ti->format);
} else {
if (ti->length > 0 && ti->length > len) {
talloc_free(token);
return EMSGSIZE;
}
}
} else {
if (ti->length > 0 && ti->length != len) {
talloc_free(token);
return EMSGSIZE;
}
check = pick_checker(ti->format);
}
} else {
pin = talloc_strndup(mem_ctx, pwd, len);
if (pin == NULL) {
return ENOMEM;
}
talloc_set_destructor(pin, token_pin_destructor);
}
/* If check is set, we need to verify the contents of the token. */
for (i = 0; check != NULL && token[i] != '\0'; i++) {
if (!check(token[i])) {
talloc_free(token);
talloc_free(pin);
return EBADMSG;
}
}
*out_token = token;
*out_pin = pin;
return 0;
}
static krb5_error_code answer_otp(krb5_context ctx,
struct krb5_req *kr,
krb5_responder_context rctx)
{
krb5_responder_otp_challenge *chl;
char *token = NULL, *pin = NULL;
const char *pwd = NULL;
krb5_error_code ret;
size_t i, len;
ret = krb5_responder_otp_get_challenge(ctx, rctx, &chl);
if (ret != EOK || chl == NULL) {
/* Either an error, or nothing to do. */
return ret;
}
if (chl->tokeninfo == NULL || chl->tokeninfo[0] == NULL) {
/* No tokeninfos? Absurd! */
ret = EINVAL;
goto done;
}
/* Validate our assumptions about the contents of authtok. */
ret = sss_authtok_get_password(kr->pd->authtok, &pwd, &len);
if (ret != EOK)
goto done;
/* Find the first supported tokeninfo which matches our authtoken. */
for (i = 0; chl->tokeninfo[i] != NULL; i++) {
ret = tokeninfo_matches(kr, chl->tokeninfo[i], pwd, len, &token, &pin);
if (ret == EOK) {
break;
}
switch (ret) {
case EBADMSG:
case EMSGSIZE:
case ENOTSUP:
case EPROTO:
break;
default:
goto done;
}
}
if (chl->tokeninfo[i] == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
("No tokeninfos found which match our credentials.\n"));
ret = EOK;
goto done;
}
if (chl->tokeninfo[i]->flags & KRB5_RESPONDER_OTP_FLAGS_COLLECT_TOKEN) {
/* Don't let SSSD cache the OTP authtok since it is single-use. */
ret = pam_add_response(kr->pd, SSS_OTP, 0, NULL);
if (ret != EOK) {
DEBUG(1, ("pam_add_response failed.\n"));
goto done;
}
}
/* Respond with the appropriate answer. */
ret = krb5_responder_otp_set_answer(ctx, rctx, i, token, pin);
done:
talloc_free(token);
talloc_free(pin);
krb5_responder_otp_challenge_free(ctx, rctx, chl);
return ret;
}
static krb5_error_code sss_krb5_responder(krb5_context ctx,
void *data,
krb5_responder_context rctx)
{
struct krb5_req *kr = talloc_get_type(data, struct krb5_req);
if (kr == NULL) {
return EINVAL;
}
return answer_otp(ctx, kr, rctx);
}
#endif
static krb5_error_code sss_krb5_prompter(krb5_context context, void *data,
const char *name, const char *banner,
int num_prompts, krb5_prompt prompts[])
{
int ret;
struct krb5_req *kr = talloc_get_type(data, struct krb5_req);
if (num_prompts != 0) {
DEBUG(1, ("Cannot handle password prompts.\n"));
return KRB5_LIBOS_CANTREADPWD;
}
if (banner == NULL || *banner == '\0') {
DEBUG(5, ("Prompter called with empty banner, nothing to do.\n"));
return EOK;
}
DEBUG(SSSDBG_FUNC_DATA, ("Prompter called with [%s].\n", banner));
ret = pam_add_response(kr->pd, SSS_PAM_TEXT_MSG, strlen(banner)+1,
(const uint8_t *) banner);
if (ret != EOK) {
DEBUG(1, ("pam_add_response failed.\n"));
}
return EOK;
}
static krb5_error_code create_empty_cred(krb5_context ctx, krb5_principal princ,
krb5_creds **_cred)
{
krb5_error_code kerr;
krb5_creds *cred = NULL;
krb5_data *krb5_realm;
cred = calloc(sizeof(krb5_creds), 1);
if (cred == NULL) {
DEBUG(1, ("calloc failed.\n"));
return ENOMEM;
}
kerr = krb5_copy_principal(ctx, princ, &cred->client);
if (kerr != 0) {
DEBUG(1, ("krb5_copy_principal failed.\n"));
goto done;
}
krb5_realm = krb5_princ_realm(ctx, princ);
kerr = krb5_build_principal_ext(ctx, &cred->server,
krb5_realm->length, krb5_realm->data,
KRB5_TGS_NAME_SIZE, KRB5_TGS_NAME,
krb5_realm->length, krb5_realm->data, 0);
if (kerr != 0) {
DEBUG(1, ("krb5_build_principal_ext failed.\n"));
goto done;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("Created empty krb5_creds.\n"));
done:
if (kerr != 0) {
krb5_free_cred_contents(ctx, cred);
free(cred);
} else {
*_cred = cred;
}
return kerr;
}
static errno_t handle_randomized(char *in)
{
size_t ccname_len;
char *ccname = NULL;
int ret;
int fd;
mode_t old_umask;
/* We only treat the FILE type case in a special way due to the history
* of storing FILE type ccache in /tmp and associated security issues */
if (in[0] == '/') {
ccname = in;
} else if (strncmp(in, "FILE:", 5) == 0) {
ccname = in + 5;
} else {
return EOK;
}
ccname_len = strlen(ccname);
if (ccname_len >= 6 && strcmp(ccname + (ccname_len - 6), "XXXXXX") == 0) {
/* NOTE: this call is only used to create a unique name, as later
* krb5_cc_initialize() will unlink and recreate the file.
* This is ok because this part of the code is called with
* privileges already dropped when handling user ccache, or the ccache
* is stored in a private directory. So we do not have huge issues if
* something races, we mostly care only about not accidentally use
* an existing name and thus failing in the process of saving the
* cache. Malicious races can only be avoided by libkrb5 itself. */
old_umask = umask(077);
fd = mkstemp(ccname);
umask(old_umask);
if (fd == -1) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE, ("mkstemp(\"%s\") failed!\n", ccname));
return ret;
}
}
return EOK;
}
/* NOTE: callers rely on 'name' being *changed* if it needs to be randomized,
* as they will then send the name back to the new name via the return call
* k5c_attach_ccname_msg(). Callers will send in a copy of the name if they
* do not care for changes. */
static krb5_error_code create_ccache(char *ccname, krb5_creds *creds)
{
krb5_context kctx = NULL;
krb5_ccache kcc = NULL;
const char *type;
krb5_error_code kerr;
#ifdef HAVE_KRB5_CC_COLLECTION
krb5_ccache cckcc;
bool switch_to_cc = false;
#endif
/* Set a restrictive umask, just in case we end up creating any file */
umask(077);
/* we create a new context here as the main process one may have been
* opened as root and contain possibly references (even open handles ?)
* to resources we do not have or do not want to have access to */
kerr = krb5_init_context(&kctx);
if (kerr) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return ERR_INTERNAL;
}
kerr = handle_randomized(ccname);
if (kerr) goto done;
kerr = krb5_cc_resolve(kctx, ccname, &kcc);
if (kerr) goto done;
type = krb5_cc_get_type(kctx, kcc);
DEBUG(SSSDBG_TRACE_ALL, ("Initializing ccache of type [%s]\n", type));
#ifdef HAVE_KRB5_CC_COLLECTION
if (krb5_cc_support_switch(kctx, type)) {
kerr = krb5_cc_set_default_name(kctx, ccname);
if (kerr) goto done;
kerr = krb5_cc_cache_match(kctx, creds->client, &cckcc);
if (kerr == KRB5_CC_NOTFOUND) {
kerr = krb5_cc_new_unique(kctx, type, NULL, &cckcc);
switch_to_cc = true;
}
if (kerr) goto done;
krb5_cc_close(kctx, kcc);
kcc = cckcc;
}
#endif
kerr = krb5_cc_initialize(kctx, kcc, creds->client);
if (kerr) goto done;
kerr = krb5_cc_store_cred(kctx, kcc, creds);
if (kerr) goto done;
#ifdef HAVE_KRB5_CC_COLLECTION
if (switch_to_cc) {
kerr = krb5_cc_switch(kctx, kcc);
if (kerr) goto done;
}
#endif
done:
if (kcc) {
/* FIXME: should we krb5_cc_destroy in case of error ? */
krb5_cc_close(kctx, kcc);
}
return kerr;
}
static errno_t pack_response_packet(TALLOC_CTX *mem_ctx, errno_t error,
struct response_data *resp_list,
uint8_t **_buf, size_t *_len)
{
uint8_t *buf;
size_t size = 0;
size_t p = 0;
struct response_data *pdr;
/* A buffer with the following structure must be created:
* int32_t status of the request (required)
* message (zero or more)
*
* A message consists of:
* int32_t type of the message
* int32_t length of the following data
* uint8_t[len] data
*/
size = sizeof(int32_t);
for (pdr = resp_list; pdr != NULL; pdr = pdr->next) {
size += 2*sizeof(int32_t) + pdr->len;
}
buf = talloc_array(mem_ctx, uint8_t, size);
if (!buf) {
DEBUG(1, ("Insufficient memory to create message.\n"));
return ENOMEM;
}
SAFEALIGN_SET_INT32(&buf[p], error, &p);
for (pdr = resp_list; pdr != NULL; pdr = pdr->next) {
SAFEALIGN_SET_INT32(&buf[p], pdr->type, &p);
SAFEALIGN_SET_INT32(&buf[p], pdr->len, &p);
safealign_memcpy(&buf[p], pdr->data, pdr->len, &p);
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("response packet size: [%zu]\n", p));
*_buf = buf;
*_len = p;
return EOK;
}
static errno_t k5c_attach_ccname_msg(struct krb5_req *kr)
{
char *msg = NULL;
int ret;
if (kr->ccname == NULL) {
DEBUG(1, ("Error obtaining ccname.\n"));
return ERR_INTERNAL;
}
msg = talloc_asprintf(kr, "%s=%s",CCACHE_ENV_NAME, kr->ccname);
if (msg == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
return ENOMEM;
}
ret = pam_add_response(kr->pd, SSS_PAM_ENV_ITEM,
strlen(msg) + 1, (uint8_t *)msg);
talloc_zfree(msg);
return ret;
}
static errno_t k5c_send_data(struct krb5_req *kr, int fd, errno_t error)
{
size_t written;
uint8_t *buf;
size_t len;
int ret;
ret = pack_response_packet(kr, error, kr->pd->resp_list, &buf, &len);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
return ret;
}
errno = 0;
written = sss_atomic_write_s(fd, buf, len);
if (written == -1) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
("write failed [%d][%s].\n", ret, strerror(ret)));
return ret;
}
if (written != len) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Write error, wrote [%zu] bytes, expected [%zu]\n",
written, len));
return EOK;
}
DEBUG(SSSDBG_TRACE_ALL, ("Response sent.\n"));
return EOK;
}
static errno_t add_ticket_times_and_upn_to_response(struct krb5_req *kr)
{
int ret;
int64_t t[4];
krb5_error_code kerr;
char *upn = NULL;
unsigned int upn_len = 0;
t[0] = (int64_t) kr->creds->times.authtime;
t[1] = (int64_t) kr->creds->times.starttime;
t[2] = (int64_t) kr->creds->times.endtime;
t[3] = (int64_t) kr->creds->times.renew_till;
ret = pam_add_response(kr->pd, SSS_KRB5_INFO_TGT_LIFETIME,
4*sizeof(int64_t), (uint8_t *) t);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
goto done;
}
kerr = krb5_unparse_name_ext(kr->ctx, kr->creds->client, &upn, &upn_len);
if (kerr != 0) {
DEBUG(SSSDBG_OP_FAILURE, ("krb5_unparse_name failed.\n"));
goto done;
}
ret = pam_add_response(kr->pd, SSS_KRB5_INFO_UPN, upn_len,
(uint8_t *) upn);
krb5_free_unparsed_name(kr->ctx, upn);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
goto done;
}
done:
return ret;
}
static krb5_error_code validate_tgt(struct krb5_req *kr)
{
krb5_error_code kerr;
krb5_error_code kt_err;
char *principal = NULL;
krb5_keytab keytab;
krb5_kt_cursor cursor;
krb5_keytab_entry entry;
krb5_verify_init_creds_opt opt;
krb5_principal validation_princ = NULL;
bool realm_entry_found = false;
krb5_ccache validation_ccache = NULL;
krb5_authdata **pac_authdata = NULL;
memset(&keytab, 0, sizeof(keytab));
kerr = krb5_kt_resolve(kr->ctx, kr->keytab, &keytab);
if (kerr != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, ("error resolving keytab [%s], " \
"not verifying TGT.\n", kr->keytab));
return kerr;
}
memset(&cursor, 0, sizeof(cursor));
kerr = krb5_kt_start_seq_get(kr->ctx, keytab, &cursor);
if (kerr != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, ("error reading keytab [%s], " \
"not verifying TGT.\n", kr->keytab));
return kerr;
}
/* We look for the first entry from our realm or take the last one */
memset(&entry, 0, sizeof(entry));
while ((kt_err = krb5_kt_next_entry(kr->ctx, keytab, &entry, &cursor)) == 0) {
if (validation_princ != NULL) {
krb5_free_principal(kr->ctx, validation_princ);
validation_princ = NULL;
}
kerr = krb5_copy_principal(kr->ctx, entry.principal,
&validation_princ);
if (kerr != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_copy_principal failed.\n"));
goto done;
}
kerr = sss_krb5_free_keytab_entry_contents(kr->ctx, &entry);
if (kerr != 0) {
DEBUG(SSSDBG_MINOR_FAILURE, ("Failed to free keytab entry.\n"));
}
memset(&entry, 0, sizeof(entry));
if (krb5_realm_compare(kr->ctx, validation_princ, kr->creds->client)) {
DEBUG(SSSDBG_TRACE_INTERNAL,
("Found keytab entry with the realm of the credential.\n"));
realm_entry_found = true;
break;
}
}
if (!realm_entry_found) {
DEBUG(SSSDBG_TRACE_INTERNAL,
("Keytab entry with the realm of the credential not found "
"in keytab. Using the last entry.\n"));
}
/* Close the keytab here. Even though we're using cursors, the file
* handle is stored in the krb5_keytab structure, and it gets
* overwritten when the verify_init_creds() call below creates its own
* cursor, creating a leak. */
kerr = krb5_kt_end_seq_get(kr->ctx, keytab, &cursor);
if (kerr != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_kt_end_seq_get failed, " \
"not verifying TGT.\n"));
goto done;
}
/* check if we got any errors from krb5_kt_next_entry */
if (kt_err != 0 && kt_err != KRB5_KT_END) {
DEBUG(SSSDBG_CRIT_FAILURE, ("error reading keytab [%s], " \
"not verifying TGT.\n", kr->keytab));
goto done;
}
/* Get the principal to which the key belongs, for logging purposes. */
principal = NULL;
kerr = krb5_unparse_name(kr->ctx, validation_princ, &principal);
if (kerr != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, ("internal error parsing principal name, "
"not verifying TGT.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
krb5_verify_init_creds_opt_init(&opt);
kerr = krb5_verify_init_creds(kr->ctx, kr->creds, validation_princ, keytab,
&validation_ccache, &opt);
if (kerr == 0) {
DEBUG(SSSDBG_TRACE_FUNC, ("TGT verified using key for [%s].\n",
principal));
} else {
DEBUG(SSSDBG_CRIT_FAILURE ,("TGT failed verification using key " \
"for [%s].\n", principal));
goto done;
}
/* Try to find and send the PAC to the PAC responder.
* Failures are not critical. */
if (kr->send_pac) {
kerr = sss_extract_pac(kr->ctx, validation_ccache, validation_princ,
kr->creds->client, keytab, &pac_authdata);
if (kerr != 0) {
DEBUG(SSSDBG_OP_FAILURE, ("sss_extract_and_send_pac failed, group " \
"membership for user with principal [%s] " \
"might not be correct.\n", kr->name));
kerr = 0;
goto done;
}
kerr = sss_send_pac(pac_authdata);
krb5_free_authdata(kr->ctx, pac_authdata);
if (kerr != 0) {
DEBUG(SSSDBG_OP_FAILURE, ("sss_send_pac failed, group " \
"membership for user with principal [%s] " \
"might not be correct.\n", kr->name));
kerr = 0;
}
}
done:
if (validation_ccache != NULL) {
krb5_cc_destroy(kr->ctx, validation_ccache);
}
if (krb5_kt_close(kr->ctx, keytab) != 0) {
DEBUG(SSSDBG_MINOR_FAILURE, ("krb5_kt_close failed"));
}
if (validation_princ != NULL) {
krb5_free_principal(kr->ctx, validation_princ);
}
if (principal != NULL) {
sss_krb5_free_unparsed_name(kr->ctx, principal);
}
return kerr;
}
static void krb5_set_canonicalize(krb5_get_init_creds_opt *opts)
{
int canonicalize = 0;
char *tmp_str;
tmp_str = getenv(SSSD_KRB5_CANONICALIZE);
if (tmp_str != NULL && strcasecmp(tmp_str, "true") == 0) {
canonicalize = 1;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_CANONICALIZE, tmp_str ? tmp_str : "not set"));
sss_krb5_get_init_creds_opt_set_canonicalize(opts, canonicalize);
}
static krb5_error_code get_and_save_tgt_with_keytab(krb5_context ctx,
krb5_principal princ,
krb5_keytab keytab,
char *ccname)
{
krb5_error_code kerr = 0;
krb5_creds creds;
krb5_get_init_creds_opt options;
memset(&creds, 0, sizeof(creds));
memset(&options, 0, sizeof(options));
krb5_get_init_creds_opt_set_address_list(&options, NULL);
krb5_get_init_creds_opt_set_forwardable(&options, 0);
krb5_get_init_creds_opt_set_proxiable(&options, 0);
krb5_set_canonicalize(&options);
kerr = krb5_get_init_creds_keytab(ctx, &creds, princ, keytab, 0, NULL,
&options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
/* Use the updated principal in the creds in case canonicalized */
kerr = create_ccache(ccname, &creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = 0;
done:
krb5_free_cred_contents(ctx, &creds);
return kerr;
}
static krb5_error_code get_and_save_tgt(struct krb5_req *kr,
const char *password)
{
const char *realm_name;
int realm_length;
krb5_error_code kerr;
char *cc_name;
kerr = sss_krb5_get_init_creds_opt_set_expire_callback(kr->ctx, kr->options,
sss_krb5_expire_callback_func,
kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
DEBUG(1, ("Failed to set expire callback, continue without.\n"));
}
sss_krb5_princ_realm(kr->ctx, kr->princ, &realm_name, &realm_length);
DEBUG(SSSDBG_TRACE_FUNC,
("Attempting kinit for realm [%s]\n",realm_name));
kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
discard_const(password),
sss_krb5_prompter, kr, 0,
NULL, kr->options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
if (kr->validate) {
kerr = validate_tgt(kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
} else {
DEBUG(SSSDBG_CONF_SETTINGS, ("TGT validation is disabled.\n"));
}
if (kr->validate || kr->fast_ccname != NULL) {
/* We drop root privileges which were needed to read the keytab file
* for the validation of the credentials or for FAST here to run the
* ccache I/O operations with user privileges. */
kerr = become_user(kr->uid, kr->gid);
if (kerr != 0) {
DEBUG(1, ("become_user failed.\n"));
return kerr;
}
}
/* If kr->ccname is cache collection (DIR:/...), we want to work
* directly with file ccache (DIR::/...), but cache collection
* should be returned back to back end.
*/
cc_name = sss_get_ccache_name_for_principal(kr->pd, kr->ctx,
kr->creds->client,
kr->ccname);
if (cc_name == NULL) {
cc_name = kr->ccname;
}
/* Use the updated principal in the creds in case canonicalized */
kerr = create_ccache(cc_name, kr->creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = add_ticket_times_and_upn_to_response(kr);
if (kerr != 0) {
DEBUG(1, ("add_ticket_times_and_upn_to_response failed.\n"));
}
kerr = 0;
done:
krb5_free_cred_contents(kr->ctx, kr->creds);
return kerr;
}
static errno_t map_krb5_error(krb5_error_code kerr)
{
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
}
switch (kerr) {
case 0:
return ERR_OK;
case KRB5_LIBOS_CANTREADPWD:
return ERR_NO_CREDS;
case KRB5KRB_AP_ERR_SKEW:
case KRB5_KDC_UNREACH:
case KRB5_REALM_CANT_RESOLVE:
return ERR_NETWORK_IO;
case KRB5KDC_ERR_CLIENT_REVOKED:
return ERR_ACCOUNT_EXPIRED;
case KRB5KDC_ERR_KEY_EXP:
return ERR_CREDS_EXPIRED;
case KRB5KRB_AP_ERR_BAD_INTEGRITY:
return ERR_AUTH_FAILED;
case KRB5_PREAUTH_FAILED:
case KRB5KDC_ERR_PREAUTH_FAILED:
return ERR_CREDS_INVALID;
default:
return ERR_INTERNAL;
}
}
static errno_t changepw_child(struct krb5_req *kr, bool prelim)
{
int ret;
krb5_error_code kerr = 0;
const char *password = NULL;
const char *newpassword = NULL;
int result_code = -1;
krb5_data result_code_string;
krb5_data result_string;
char *user_error_message = NULL;
size_t user_resp_len;
uint8_t *user_resp;
krb5_prompter_fct prompter = NULL;
const char *realm_name;
int realm_length;
krb5_get_init_creds_opt *chagepw_options;
size_t msg_len;
uint8_t *msg;
DEBUG(SSSDBG_TRACE_LIBS, ("Password change operation\n"));
ret = sss_authtok_get_password(kr->pd->authtok, &password, NULL);
if (ret != EOK) {
DEBUG(1, ("Failed to fetch current password [%d] %s.\n",
ret, strerror(ret)));
return ERR_NO_CREDS;
}
if (!prelim) {
/* We do not need a password expiration warning here. */
prompter = sss_krb5_prompter;
}
kerr = get_changepw_options(kr->ctx, &chagepw_options);
if (kerr != 0) {
DEBUG(SSSDBG_OP_FAILURE, ("get_changepw_options failed.\n"));
return kerr;
}
sss_krb5_princ_realm(kr->ctx, kr->princ, &realm_name, &realm_length);
DEBUG(SSSDBG_TRACE_FUNC,
("Attempting kinit for realm [%s]\n",realm_name));
kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
discard_const(password),
prompter, kr, 0,
SSSD_KRB5_CHANGEPW_PRINCIPAL,
chagepw_options);
sss_krb5_get_init_creds_opt_free(kr->ctx, chagepw_options);
if (kerr != 0) {
ret = pack_user_info_chpass_error(kr->pd, "Old password not accepted.",
&msg_len, &msg);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("pack_user_info_chpass_error failed.\n"));
} else {
ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, msg_len,
msg);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("pam_add_response failed.\n"));
}
}
return kerr;
}
sss_authtok_set_empty(kr->pd->authtok);
if (prelim) {
DEBUG(SSSDBG_TRACE_LIBS,
("Initial authentication for change password operation "
"successful.\n"));
krb5_free_cred_contents(kr->ctx, kr->creds);
return EOK;
}
ret = sss_authtok_get_password(kr->pd->newauthtok, &newpassword, NULL);
if (ret != EOK) {
DEBUG(1, ("Failed to fetch new password [%d] %s.\n",
ret, strerror(ret)));
return ERR_NO_CREDS;
}
memset(&result_code_string, 0, sizeof(krb5_data));
memset(&result_string, 0, sizeof(krb5_data));
kerr = krb5_change_password(kr->ctx, kr->creds,
discard_const(newpassword), &result_code,
&result_code_string, &result_string);
if (kerr == KRB5_KDC_UNREACH) {
return ERR_NETWORK_IO;
}
if (kerr != 0 || result_code != 0) {
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
}
if (result_code_string.length > 0) {
DEBUG(1, ("krb5_change_password failed [%d][%.*s].\n", result_code,
result_code_string.length, result_code_string.data));
user_error_message = talloc_strndup(kr->pd, result_code_string.data,
result_code_string.length);
if (user_error_message == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
}
}
if (result_string.length > 0 && result_string.data[0] != '\0') {
DEBUG(1, ("krb5_change_password failed [%d][%.*s].\n", result_code,
result_string.length, result_string.data));
talloc_free(user_error_message);
user_error_message = talloc_strndup(kr->pd, result_string.data,
result_string.length);
if (user_error_message == NULL) {
DEBUG(1, ("talloc_strndup failed.\n"));
}
} else if (result_code == KRB5_KPASSWD_SOFTERROR) {
user_error_message = talloc_strdup(kr->pd, "Please make sure the "
"password meets the complexity constraints.");
if (user_error_message == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_strndup failed.\n"));
}
}
if (user_error_message != NULL) {
ret = pack_user_info_chpass_error(kr->pd, user_error_message,
&user_resp_len, &user_resp);
if (ret != EOK) {
DEBUG(1, ("pack_user_info_chpass_error failed.\n"));
} else {
ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, user_resp_len,
user_resp);
if (ret != EOK) {
DEBUG(1, ("pack_response_packet failed.\n"));
}
}
}
return ERR_CHPASS_FAILED;
}
krb5_free_cred_contents(kr->ctx, kr->creds);
kerr = get_and_save_tgt(kr, newpassword);
sss_authtok_set_empty(kr->pd->newauthtok);
if (kerr == 0) {
kerr = k5c_attach_ccname_msg(kr);
}
return map_krb5_error(kerr);
}
static errno_t tgt_req_child(struct krb5_req *kr)
{
krb5_get_init_creds_opt *chagepw_options;
const char *password = NULL;
krb5_error_code kerr;
int ret;
DEBUG(SSSDBG_TRACE_LIBS, ("Attempting to get a TGT\n"));
ret = sss_authtok_get_password(kr->pd->authtok, &password, NULL);
switch (ret) {
case EOK:
break;
case EACCES:
DEBUG(SSSDBG_OP_FAILURE, ("Invalid authtok type\n"));
return ERR_INVALID_CRED_TYPE;
break;
default:
DEBUG(SSSDBG_OP_FAILURE, ("No credentials available\n"));
return ERR_NO_CREDS;
break;
}
kerr = get_and_save_tgt(kr, password);
if (kerr != KRB5KDC_ERR_KEY_EXP) {
if (kerr == 0) {
kerr = k5c_attach_ccname_msg(kr);
}
ret = map_krb5_error(kerr);
goto done;
}
/* If the password is expired the KDC will always return
KRB5KDC_ERR_KEY_EXP regardless if the supplied password is correct or
not. In general the password can still be used to get a changepw ticket.
So we validate the password by trying to get a changepw ticket. */
DEBUG(SSSDBG_TRACE_LIBS, ("Password was expired\n"));
kerr = sss_krb5_get_init_creds_opt_set_expire_callback(kr->ctx,
kr->options,
NULL, NULL);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
DEBUG(1, ("Failed to unset expire callback, continue ...\n"));
}
kerr = get_changepw_options(kr->ctx, &chagepw_options);
if (kerr != 0) {
DEBUG(SSSDBG_OP_FAILURE, ("get_changepw_options failed.\n"));
return kerr;
}
kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
discard_const(password),
sss_krb5_prompter, kr, 0,
SSSD_KRB5_CHANGEPW_PRINCIPAL,
chagepw_options);
sss_krb5_get_init_creds_opt_free(kr->ctx, chagepw_options);
krb5_free_cred_contents(kr->ctx, kr->creds);
if (kerr == 0) {
ret = ERR_CREDS_EXPIRED;
} else {
ret = map_krb5_error(kerr);
}
done:
sss_authtok_set_empty(kr->pd->authtok);
return ret;
}
static errno_t kuserok_child(struct krb5_req *kr)
{
krb5_boolean access_allowed;
krb5_error_code kerr;
DEBUG(SSSDBG_TRACE_LIBS, ("Verifying if principal can log in as user\n"));
/* krb5_kuserok tries to verify that kr->pd->user is a locally known
* account, so we have to unset _SSS_LOOPS to make getpwnam() work. */
if (unsetenv("_SSS_LOOPS") != 0) {
DEBUG(1, ("Failed to unset _SSS_LOOPS, "
"krb5_kuserok will most certainly fail.\n"));
}
kerr = krb5_set_default_realm(kr->ctx, kr->realm);
if (kerr != 0) {
DEBUG(1, ("krb5_set_default_realm failed, "
"krb5_kuserok may fail.\n"));
}
access_allowed = krb5_kuserok(kr->ctx, kr->princ, kr->pd->user);
DEBUG(SSSDBG_TRACE_LIBS,
("Access was %s\n", access_allowed ? "allowed" : "denied"));
if (access_allowed) {
return EOK;
}
return ERR_AUTH_DENIED;
}
static errno_t renew_tgt_child(struct krb5_req *kr)
{
const char *ccname;
krb5_ccache ccache = NULL;
krb5_error_code kerr;
int ret;
DEBUG(SSSDBG_TRACE_LIBS, ("Renewing a ticket\n"));
ret = sss_authtok_get_ccfile(kr->pd->authtok, &ccname, NULL);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
("Unsupported authtok type for TGT renewal [%d].\n",
sss_authtok_get_type(kr->pd->authtok)));
return ERR_INVALID_CRED_TYPE;
}
kerr = krb5_cc_resolve(kr->ctx, ccname, &ccache);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = krb5_get_renewed_creds(kr->ctx, kr->creds, kr->princ, ccache, NULL);
if (kerr != 0) {
goto done;
}
if (kr->validate) {
kerr = validate_tgt(kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
} else {
DEBUG(SSSDBG_CONF_SETTINGS, ("TGT validation is disabled.\n"));
}
if (kr->validate || kr->fast_ccname != NULL) {
/* We drop root privileges which were needed to read the keytab file
* for the validation of the credentials or for FAST here to run the
* ccache I/O operations with user privileges. */
kerr = become_user(kr->uid, kr->gid);
if (kerr != 0) {
DEBUG(1, ("become_user failed.\n"));
goto done;
}
}
kerr = krb5_cc_initialize(kr->ctx, ccache, kr->princ);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = krb5_cc_store_cred(kr->ctx, ccache, kr->creds);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
goto done;
}
kerr = add_ticket_times_and_upn_to_response(kr);
if (kerr != 0) {
DEBUG(1, ("add_ticket_times_and_upn_to_response failed.\n"));
}
kerr = k5c_attach_ccname_msg(kr);
done:
krb5_free_cred_contents(kr->ctx, kr->creds);
if (ccache != NULL) {
krb5_cc_close(kr->ctx, ccache);
}
return map_krb5_error(kerr);
}
static errno_t create_empty_ccache(struct krb5_req *kr)
{
krb5_creds *creds = NULL;
krb5_error_code kerr;
DEBUG(SSSDBG_TRACE_LIBS, ("Creating empty ccache\n"));
kerr = create_empty_cred(kr->ctx, kr->princ, &creds);
if (kerr == 0) {
kerr = create_ccache(kr->ccname, creds);
}
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
} else {
kerr = k5c_attach_ccname_msg(kr);
}
krb5_free_creds(kr->ctx, creds);
return map_krb5_error(kerr);
}
static errno_t unpack_authtok(struct sss_auth_token *tok,
uint8_t *buf, size_t size, size_t *p)
{
uint32_t auth_token_type;
uint32_t auth_token_length;
errno_t ret = EOK;
SAFEALIGN_COPY_UINT32_CHECK(&auth_token_type, buf + *p, size, p);
SAFEALIGN_COPY_UINT32_CHECK(&auth_token_length, buf + *p, size, p);
if ((*p + auth_token_length) > size) {
return EINVAL;
}
switch (auth_token_type) {
case SSS_AUTHTOK_TYPE_EMPTY:
sss_authtok_set_empty(tok);
break;
case SSS_AUTHTOK_TYPE_PASSWORD:
ret = sss_authtok_set_password(tok, (char *)(buf + *p), 0);
break;
case SSS_AUTHTOK_TYPE_CCFILE:
ret = sss_authtok_set_ccfile(tok, (char *)(buf + *p), 0);
break;
default:
return EINVAL;
}
if (ret == EOK) {
*p += auth_token_length;
}
return ret;
}
static errno_t unpack_buffer(uint8_t *buf, size_t size,
struct krb5_req *kr, uint32_t *offline)
{
size_t p = 0;
uint32_t len;
uint32_t validate;
uint32_t send_pac;
uint32_t use_enterprise_princ;
struct pam_data *pd;
errno_t ret;
DEBUG(SSSDBG_TRACE_LIBS, ("total buffer size: [%zu]\n", size));
if (!offline || !kr) return EINVAL;
pd = create_pam_data(kr);
if (pd == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_zero failed.\n"));
return ENOMEM;
}
kr->pd = pd;
SAFEALIGN_COPY_UINT32_CHECK(&pd->cmd, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&kr->uid, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&kr->gid, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&validate, buf + p, size, &p);
kr->validate = (validate == 0) ? false : true;
SAFEALIGN_COPY_UINT32_CHECK(offline, buf + p, size, &p);
SAFEALIGN_COPY_UINT32_CHECK(&send_pac, buf + p, size, &p);
kr->send_pac = (send_pac == 0) ? false : true;
SAFEALIGN_COPY_UINT32_CHECK(&use_enterprise_princ, buf + p, size, &p);
kr->use_enterprise_princ = (use_enterprise_princ == 0) ? false : true;
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
kr->upn = talloc_strndup(pd, (char *)(buf + p), len);
if (kr->upn == NULL) return ENOMEM;
p += len;
DEBUG(SSSDBG_CONF_SETTINGS,
("cmd [%d] uid [%llu] gid [%llu] validate [%s] "
"enterprise principal [%s] offline [%s] UPN [%s]\n",
pd->cmd, (unsigned long long) kr->uid,
(unsigned long long) kr->gid, kr->validate ? "true" : "false",
kr->use_enterprise_princ ? "true" : "false",
*offline ? "true" : "false", kr->upn ? kr->upn : "none"));
if (pd->cmd == SSS_PAM_AUTHENTICATE ||
pd->cmd == SSS_CMD_RENEW ||
pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM || pd->cmd == SSS_PAM_CHAUTHTOK) {
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
kr->ccname = talloc_strndup(pd, (char *)(buf + p), len);
if (kr->ccname == NULL) return ENOMEM;
p += len;
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
kr->keytab = talloc_strndup(pd, (char *)(buf + p), len);
if (kr->keytab == NULL) return ENOMEM;
p += len;
ret = unpack_authtok(pd->authtok, buf, size, &p);
if (ret) {
return ret;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("ccname: [%s] keytab: [%s]\n",
kr->ccname, kr->keytab));
} else {
kr->ccname = NULL;
kr->keytab = NULL;
sss_authtok_set_empty(pd->authtok);
}
if (pd->cmd == SSS_PAM_CHAUTHTOK) {
ret = unpack_authtok(pd->newauthtok, buf, size, &p);
if (ret) {
return ret;
}
} else {
sss_authtok_set_empty(pd->newauthtok);
}
if (pd->cmd == SSS_PAM_ACCT_MGMT) {
SAFEALIGN_COPY_UINT32_CHECK(&len, buf + p, size, &p);
if ((p + len ) > size) return EINVAL;
pd->user = talloc_strndup(pd, (char *)(buf + p), len);
if (pd->user == NULL) return ENOMEM;
p += len;
DEBUG(SSSDBG_CONF_SETTINGS, ("user: [%s]\n", pd->user));
} else {
pd->user = NULL;
}
return EOK;
}
static int krb5_cleanup(struct krb5_req *kr)
{
if (kr == NULL) return EOK;
if (kr->options != NULL) {
sss_krb5_get_init_creds_opt_free(kr->ctx, kr->options);
}
if (kr->creds != NULL) {
krb5_free_cred_contents(kr->ctx, kr->creds);
krb5_free_creds(kr->ctx, kr->creds);
}
if (kr->name != NULL)
sss_krb5_free_unparsed_name(kr->ctx, kr->name);
if (kr->princ != NULL)
krb5_free_principal(kr->ctx, kr->princ);
if (kr->ctx != NULL)
krb5_free_context(kr->ctx);
memset(kr, 0, sizeof(struct krb5_req));
return EOK;
}
static krb5_error_code get_tgt_times(krb5_context ctx, const char *ccname,
krb5_principal server_principal,
krb5_principal client_principal,
sss_krb5_ticket_times *tgtt)
{
krb5_error_code krberr;
krb5_ccache ccache = NULL;
krb5_creds mcred;
krb5_creds cred;
krberr = krb5_cc_resolve(ctx, ccname, &ccache);
if (krberr != 0) {
DEBUG(1, ("krb5_cc_resolve failed.\n"));
goto done;
}
memset(&mcred, 0, sizeof(mcred));
memset(&cred, 0, sizeof(mcred));
mcred.server = server_principal;
mcred.client = client_principal;
krberr = krb5_cc_retrieve_cred(ctx, ccache, 0, &mcred, &cred);
if (krberr != 0) {
DEBUG(1, ("krb5_cc_retrieve_cred failed.\n"));
krberr = 0;
goto done;
}
tgtt->authtime = cred.times.authtime;
tgtt->starttime = cred.times.starttime;
tgtt->endtime = cred.times.endtime;
tgtt->renew_till = cred.times.renew_till;
krb5_free_cred_contents(ctx, &cred);
krberr = 0;
done:
if (ccache != NULL) {
krb5_cc_close(ctx, ccache);
}
return krberr;
}
static krb5_error_code check_fast_ccache(TALLOC_CTX *mem_ctx,
krb5_context ctx,
const char *primary,
const char *realm,
const char *keytab_name,
char **fast_ccname)
{
TALLOC_CTX *tmp_ctx = NULL;
krb5_error_code kerr;
char *ccname;
char *server_name;
sss_krb5_ticket_times tgtt;
krb5_keytab keytab = NULL;
krb5_principal client_princ = NULL;
krb5_principal server_princ = NULL;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(1, ("talloc_new failed.\n"));
return ENOMEM;
}
ccname = talloc_asprintf(tmp_ctx, "FILE:%s/fast_ccache_%s", DB_PATH, realm);
if (ccname == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
kerr = ENOMEM;
goto done;
}
if (keytab_name != NULL) {
kerr = krb5_kt_resolve(ctx, keytab_name, &keytab);
} else {
kerr = krb5_kt_default(ctx, &keytab);
}
if (kerr) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Failed to read keytab file [%s]: %s\n",
KEYTAB_CLEAN_NAME,
sss_krb5_get_error_message(ctx, kerr)));
goto done;
}
kerr = find_principal_in_keytab(ctx, keytab, primary, realm, &client_princ);
if (kerr != 0) {
DEBUG(SSSDBG_MINOR_FAILURE,
("find_principal_in_keytab failed for principal %s@%s.\n",
primary, realm));
goto done;
}
server_name = talloc_asprintf(tmp_ctx, "krbtgt/%s@%s", realm, realm);
if (server_name == NULL) {
DEBUG(1, ("talloc_asprintf failed.\n"));
kerr = ENOMEM;
goto done;
}
kerr = krb5_parse_name(ctx, server_name, &server_princ);
if (kerr != 0) {
DEBUG(1, ("krb5_parse_name failed.\n"));
goto done;
}
memset(&tgtt, 0, sizeof(tgtt));
kerr = get_tgt_times(ctx, ccname, server_princ, client_princ, &tgtt);
if (kerr == 0) {
if (tgtt.endtime > time(NULL)) {
DEBUG(5, ("FAST TGT is still valid.\n"));
goto done;
}
}
kerr = get_and_save_tgt_with_keytab(ctx, client_princ, keytab, ccname);
if (kerr != 0) {
DEBUG(1, ("get_and_save_tgt_with_keytab failed.\n"));
goto done;
}
kerr = 0;
done:
if (client_princ != NULL) {
krb5_free_principal(ctx, client_princ);
}
if (server_princ != NULL) {
krb5_free_principal(ctx, server_princ);
}
if (kerr == 0) {
*fast_ccname = talloc_steal(mem_ctx, ccname);
}
talloc_free(tmp_ctx);
if (keytab != NULL) {
krb5_kt_close(ctx, keytab);
}
return kerr;
}
static errno_t k5c_recv_data(struct krb5_req *kr, int fd, uint32_t *offline)
{
uint8_t buf[IN_BUF_SIZE];
ssize_t len;
errno_t ret;
errno = 0;
len = sss_atomic_read_s(fd, buf, IN_BUF_SIZE);
if (len == -1) {
ret = errno;
ret = (ret == 0) ? EINVAL: ret;
DEBUG(SSSDBG_CRIT_FAILURE,
("read failed [%d][%s].\n", ret, strerror(ret)));
return ret;
}
ret = unpack_buffer(buf, len, kr, offline);
if (ret != EOK) {
DEBUG(1, ("unpack_buffer failed.\n"));
}
return ret;
}
static int k5c_setup_fast(struct krb5_req *kr, char *lifetime_str, bool demand)
{
krb5_principal fast_princ_struct;
krb5_data *realm_data;
char *fast_principal_realm;
char *fast_principal;
krb5_error_code kerr;
char *tmp_str;
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_LIFETIME, lifetime_str));
tmp_str = getenv(SSSD_KRB5_FAST_PRINCIPAL);
if (tmp_str) {
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_FAST_PRINCIPAL, tmp_str));
kerr = krb5_parse_name(kr->ctx, tmp_str, &fast_princ_struct);
if (kerr) {
DEBUG(1, ("krb5_parse_name failed.\n"));
return kerr;
}
kerr = sss_krb5_unparse_name_flags(kr->ctx, fast_princ_struct,
KRB5_PRINCIPAL_UNPARSE_NO_REALM,
&tmp_str);
if (kerr) {
DEBUG(1, ("sss_krb5_unparse_name_flags failed.\n"));
return kerr;
}
fast_principal = talloc_strdup(kr, tmp_str);
if (!fast_principal) {
DEBUG(1, ("talloc_strdup failed.\n"));
return KRB5KRB_ERR_GENERIC;
}
free(tmp_str);
realm_data = krb5_princ_realm(kr->ctx, fast_princ_struct);
fast_principal_realm = talloc_asprintf(kr, "%.*s", realm_data->length, realm_data->data);
if (!fast_principal_realm) {
DEBUG(1, ("talloc_asprintf failed.\n"));
return ENOMEM;
}
} else {
fast_principal_realm = kr->realm;
fast_principal = NULL;
}
kerr = check_fast_ccache(kr, kr->ctx, fast_principal, fast_principal_realm,
kr->keytab, &kr->fast_ccname);
if (kerr != 0) {
DEBUG(1, ("check_fast_ccache failed.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
kerr = sss_krb5_get_init_creds_opt_set_fast_ccache_name(kr->ctx,
kr->options,
kr->fast_ccname);
if (kerr != 0) {
DEBUG(1, ("sss_krb5_get_init_creds_opt_set_fast_ccache_name "
"failed.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
if (demand) {
kerr = sss_krb5_get_init_creds_opt_set_fast_flags(kr->ctx,
kr->options,
SSS_KRB5_FAST_REQUIRED);
if (kerr != 0) {
DEBUG(1, ("sss_krb5_get_init_creds_opt_set_fast_flags "
"failed.\n"));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
}
return EOK;
}
static int k5c_setup(struct krb5_req *kr, uint32_t offline)
{
krb5_error_code kerr;
char *lifetime_str;
char *use_fast_str;
krb5_deltat lifetime;
int parse_flags;
kr->realm = getenv(SSSD_KRB5_REALM);
if (kr->realm == NULL) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Cannot read [%s] from environment.\n", SSSD_KRB5_REALM));
}
kerr = krb5_init_context(&kr->ctx);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
/* Set the global error context */
krb5_error_ctx = kr->ctx;
if (debug_level & SSSDBG_TRACE_ALL) {
kerr = sss_child_set_krb5_tracing(kr->ctx);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_MINOR_FAILURE, kerr);
return EIO;
}
}
/* Enterprise principals require that a default realm is available. To
* make SSSD more robust in the case that the default realm option is
* missing in krb5.conf or to allow SSSD to work with multiple unconnected
* realms (e.g. AD domains without trust between them) the default realm
* will be set explicitly. */
if (kr->use_enterprise_princ) {
kerr = krb5_set_default_realm(kr->ctx, kr->realm);
if (kerr != 0) {
DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_set_default_realm failed.\n"));
}
}
parse_flags = kr->use_enterprise_princ ? KRB5_PRINCIPAL_PARSE_ENTERPRISE : 0;
kerr = sss_krb5_parse_name_flags(kr->ctx, kr->upn, parse_flags, &kr->princ);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
kerr = krb5_unparse_name(kr->ctx, kr->princ, &kr->name);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
kr->creds = calloc(1, sizeof(krb5_creds));
if (kr->creds == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
return ENOMEM;
}
kerr = sss_krb5_get_init_creds_opt_alloc(kr->ctx, &kr->options);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_RESPONDER
kerr = krb5_get_init_creds_opt_set_responder(kr->ctx, kr->options,
sss_krb5_responder, kr);
if (kerr != 0) {
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
#endif
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_CHANGE_PASSWORD_PROMPT
/* A prompter is used to catch messages about when a password will
* expired. The library shall not use the prompter to ask for a new password
* but shall return KRB5KDC_ERR_KEY_EXP. */
krb5_get_init_creds_opt_set_change_password_prompt(kr->options, 0);
#endif
lifetime_str = getenv(SSSD_KRB5_RENEWABLE_LIFETIME);
if (lifetime_str == NULL) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Cannot read [%s] from environment.\n",
SSSD_KRB5_RENEWABLE_LIFETIME));
} else {
kerr = krb5_string_to_deltat(lifetime_str, &lifetime);
if (kerr != 0) {
DEBUG(1, ("krb5_string_to_deltat failed for [%s].\n",
lifetime_str));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
SSSD_KRB5_RENEWABLE_LIFETIME, lifetime_str));
krb5_get_init_creds_opt_set_renew_life(kr->options, lifetime);
}
lifetime_str = getenv(SSSD_KRB5_LIFETIME);
if (lifetime_str == NULL) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Cannot read [%s] from environment.\n",
SSSD_KRB5_LIFETIME));
} else {
kerr = krb5_string_to_deltat(lifetime_str, &lifetime);
if (kerr != 0) {
DEBUG(1, ("krb5_string_to_deltat failed for [%s].\n",
lifetime_str));
KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
return kerr;
}
DEBUG(SSSDBG_CONF_SETTINGS,
("%s is set to [%s]\n", SSSD_KRB5_LIFETIME, lifetime_str));
krb5_get_init_creds_opt_set_tkt_life(kr->options, lifetime);
}
if (!offline) {
krb5_set_canonicalize(kr->options);
use_fast_str = getenv(SSSD_KRB5_USE_FAST);
if (use_fast_str == NULL || strcasecmp(use_fast_str, "never") == 0) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Not using FAST.\n"));
} else if (strcasecmp(use_fast_str, "try") == 0) {
kerr = k5c_setup_fast(kr, lifetime_str, false);
} else if (strcasecmp(use_fast_str, "demand") == 0) {
kerr = k5c_setup_fast(kr, lifetime_str, true);
} else {
DEBUG(SSSDBG_CRIT_FAILURE,
("Unsupported value [%s] for krb5_use_fast.\n",
use_fast_str));
return EINVAL;
}
}
/* TODO: set options, e.g.
* krb5_get_init_creds_opt_set_forwardable
* krb5_get_init_creds_opt_set_proxiable
* krb5_get_init_creds_opt_set_etype_list
* krb5_get_init_creds_opt_set_address_list
* krb5_get_init_creds_opt_set_preauth_list
* krb5_get_init_creds_opt_set_salt
* krb5_get_init_creds_opt_set_change_password_prompt
* krb5_get_init_creds_opt_set_pa
*/
return kerr;
}
int main(int argc, const char *argv[])
{
struct krb5_req *kr = NULL;
uint32_t offline;
int opt;
poptContext pc;
int debug_fd = -1;
errno_t ret;
struct poptOption long_options[] = {
POPT_AUTOHELP
{"debug-level", 'd', POPT_ARG_INT, &debug_level, 0,
_("Debug level"), NULL},
{"debug-timestamps", 0, POPT_ARG_INT, &debug_timestamps, 0,
_("Add debug timestamps"), NULL},
{"debug-microseconds", 0, POPT_ARG_INT, &debug_microseconds, 0,
_("Show timestamps with microseconds"), NULL},
{"debug-fd", 0, POPT_ARG_INT, &debug_fd, 0,
_("An open file descriptor for the debug logs"), NULL},
POPT_TABLEEND
};
/* Set debug level to invalid value so we can decide if -d 0 was used. */
debug_level = SSSDBG_INVALID;
pc = poptGetContext(argv[0], argc, argv, long_options, 0);
while((opt = poptGetNextOpt(pc)) != -1) {
switch(opt) {
default:
fprintf(stderr, "\nInvalid option %s: %s\n\n",
poptBadOption(pc, 0), poptStrerror(opt));
poptPrintUsage(pc, stderr, 0);
_exit(-1);
}
}
poptFreeContext(pc);
DEBUG_INIT(debug_level);
kr = talloc_zero(NULL, struct krb5_req);
if (kr == NULL) {
DEBUG(1, ("talloc failed.\n"));
exit(-1);
}
debug_prg_name = talloc_asprintf(kr, "[sssd[krb5_child[%d]]]", getpid());
if (!debug_prg_name) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_asprintf failed.\n"));
ret = ENOMEM;
goto done;
}
if (debug_fd != -1) {
ret = set_debug_file_from_fd(debug_fd);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("set_debug_file_from_fd failed.\n"));
}
}
DEBUG(SSSDBG_TRACE_FUNC, ("krb5_child started.\n"));
ret = k5c_recv_data(kr, STDIN_FILENO, &offline);
if (ret != EOK) {
goto done;
}
close(STDIN_FILENO);
ret = k5c_setup(kr, offline);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_child_setup failed.\n"));
goto done;
}
switch(kr->pd->cmd) {
case SSS_PAM_AUTHENTICATE:
/* If we are offline, we need to create an empty ccache file */
if (offline) {
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform offline auth\n"));
ret = create_empty_ccache(kr);
} else {
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform online auth\n"));
ret = tgt_req_child(kr);
}
break;
case SSS_PAM_CHAUTHTOK:
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform password change\n"));
ret = changepw_child(kr, false);
break;
case SSS_PAM_CHAUTHTOK_PRELIM:
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform password change checks\n"));
ret = changepw_child(kr, true);
break;
case SSS_PAM_ACCT_MGMT:
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform account management\n"));
ret = kuserok_child(kr);
break;
case SSS_CMD_RENEW:
if (offline) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Cannot renew TGT while offline\n"));
ret = KRB5_KDC_UNREACH;
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC, ("Will perform ticket renewal\n"));
ret = renew_tgt_child(kr);
break;
default:
DEBUG(1, ("PAM command [%d] not supported.\n", kr->pd->cmd));
ret = EINVAL;
goto done;
}
ret = k5c_send_data(kr, STDOUT_FILENO, ret);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to send reply\n"));
}
done:
krb5_cleanup(kr);
talloc_free(kr);
if (ret == EOK) {
DEBUG(SSSDBG_TRACE_FUNC, ("krb5_child completed successfully\n"));
exit(0);
} else {
DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_child failed!\n"));
exit(-1);
}
}