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/*
SSSD
PAM Responder - helpers for PAM prompting configuration
Copyright (C) Sumit Bose <sbose@redhat.com> 2019
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "util/util.h"
#include "util/sss_pam_data.h"
#include "confdb/confdb.h"
#include "sss_client/sss_cli.h"
#include "responder/pam/pamsrv.h"
#define DEFAULT_PASSKEY_PROMPT_INTERACTIVE _("Insert your Passkey device, then press ENTER.")
#define DEFAULT_PASSKEY_PROMPT_TOUCH _("Please touch the device.")
typedef errno_t (pam_set_prompting_fn_t)(TALLOC_CTX *, struct confdb_ctx *,
const char *,
struct prompt_config ***);
static errno_t pam_set_password_prompting_options(TALLOC_CTX *tmp_ctx,
struct confdb_ctx *cdb,
const char *section,
struct prompt_config ***pc_list)
{
int ret;
char *value = NULL;
ret = confdb_get_string(cdb, tmp_ctx, section, CONFDB_PC_PASSWORD_PROMPT,
NULL, &value);
if (ret == EOK && value != NULL) {
ret = pc_list_add_password(pc_list, value);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "pc_list_add_password failed.\n");
}
return ret;
}
return ENOENT;
}
static errno_t pam_set_2fa_prompting_options(TALLOC_CTX *tmp_ctx,
struct confdb_ctx *cdb,
const char *section,
struct prompt_config ***pc_list)
{
bool single_2fa_prompt = false;
char *first_prompt = NULL;
char *second_prompt = NULL;
int ret;
ret = confdb_get_bool(cdb, section, CONFDB_PC_2FA_SINGLE_PROMPT, false,
&single_2fa_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "confdb_get_bool failed, using defaults");
}
ret = confdb_get_string(cdb, tmp_ctx, section, CONFDB_PC_2FA_1ST_PROMPT,
NULL, &first_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "confdb_get_string failed, using defaults");
}
if (single_2fa_prompt) {
ret = pc_list_add_2fa_single(pc_list, first_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "pc_list_add_2fa_single failed.\n");
}
return ret;
} else {
ret = confdb_get_string(cdb, tmp_ctx, section, CONFDB_PC_2FA_2ND_PROMPT,
NULL, &second_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
"confdb_get_string failed, using defaults");
}
ret = pc_list_add_2fa(pc_list, first_prompt, second_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "pc_list_add_2fa failed.\n");
}
return ret;
}
return ENOENT;
}
static errno_t pam_set_passkey_prompting_options(TALLOC_CTX *tmp_ctx,
struct confdb_ctx *cdb,
const char *section,
struct prompt_config ***pc_list)
{
bool passkey_interactive = false;
char *passkey_interactive_prompt = NULL;
bool passkey_touch = false;
char *passkey_touch_prompt = NULL;
int ret;
ret = confdb_get_bool(cdb, section, CONFDB_PC_PASSKEY_INTERACTIVE, false,
&passkey_interactive);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "confdb_get_bool failed, using defaults");
}
if (passkey_interactive) {
ret = confdb_get_string(cdb, tmp_ctx, section, CONFDB_PC_PASSKEY_INTERACTIVE_PROMPT,
DEFAULT_PASSKEY_PROMPT_INTERACTIVE, &passkey_interactive_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "confdb_get_string failed, using defaults");
}
}
ret = confdb_get_bool(cdb, section, CONFDB_PC_PASSKEY_TOUCH, false,
&passkey_touch);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "confdb_get_bool failed, using defaults");
}
if (passkey_touch) {
ret = confdb_get_string(cdb, tmp_ctx, section, CONFDB_PC_PASSKEY_TOUCH_PROMPT,
DEFAULT_PASSKEY_PROMPT_TOUCH, &passkey_touch_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "confdb_get_string failed, using defaults");
}
}
ret = pc_list_add_passkey(pc_list, passkey_interactive_prompt, passkey_touch_prompt);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "pc_list_add_passkey_touch failed.\n");
}
return ret;
}
static errno_t pam_set_prompting_options(struct confdb_ctx *cdb,
const char *service_name,
char **sections,
int num_sections,
const char *section_path,
pam_set_prompting_fn_t *setter,
struct prompt_config ***pc_list)
{
char *dummy;
size_t c;
bool global = false;
bool specific = false;
char *section = NULL;
int ret;
char *last;
TALLOC_CTX *tmp_ctx = NULL;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
ret = ENOMEM;
goto done;
}
dummy = talloc_asprintf(tmp_ctx, "%s/%s", section_path,
service_name);
for (c = 0; c < num_sections; c++) {
if (strcmp(sections[c], section_path) == 0) {
global = true;
}
if (dummy != NULL && strcmp(sections[c], dummy) == 0) {
specific = true;
}
}
section = talloc_asprintf(tmp_ctx, "%s/%s", CONFDB_PC_CONF_ENTRY, dummy);
if (section == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_asprintf failed.\n");
ret = ENOMEM;
goto done;
}
ret = ENOENT;
if (specific) {
ret = setter(tmp_ctx, cdb, section, pc_list);
}
if (global && ret == ENOENT) {
last = strrchr(section, '/');
if (last != NULL) {
*last = '\0';
ret = setter(tmp_ctx, cdb, section, pc_list);
}
}
if (ret != EOK && ret != ENOENT) {
DEBUG(SSSDBG_OP_FAILURE, "setter failed.\n");
goto done;
}
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
errno_t pam_eval_prompting_config(struct pam_ctx *pctx, struct pam_data *pd)
{
int ret;
struct prompt_config **pc_list = NULL;
int resp_len;
uint8_t *resp_data = NULL;
struct pam_resp_auth_type types;
if (pctx->num_prompting_config_sections == 0) {
DEBUG(SSSDBG_TRACE_ALL, "No prompting configuration found.\n");
return EOK;
}
ret = pam_get_auth_types(pd, &types);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "Failed to get authentication types\n");
goto done;
}
if (types.passkey_auth) {
ret = pam_set_prompting_options(pctx->rctx->cdb, pd->service,
pctx->prompting_config_sections,
pctx->num_prompting_config_sections,
CONFDB_PC_TYPE_PASSKEY,
pam_set_passkey_prompting_options,
&pc_list);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
"pam_set_prompting_options failed.\n");
goto done;
}
}
if (types.cert_auth) {
/* If certificate based authentication is possilbe, i.e. a Smartcard
* or similar with the mapped certificate is available we currently
* prefer this authentication type unconditionally. If other types
* should be used the Smartcard can be removed during authentication.
* Since there currently are no specific options for cert_auth we are
* done. */
ret = EOK;
goto done;
}
/* If OTP and password auth are possible we currently prefer OTP. */
if (types.otp_auth) {
ret = pam_set_prompting_options(pctx->rctx->cdb, pd->service,
pctx->prompting_config_sections,
pctx->num_prompting_config_sections,
CONFDB_PC_TYPE_2FA,
pam_set_2fa_prompting_options,
&pc_list);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
"pam_set_prompting_options failed.\n");
goto done;
}
}
if (types.password_auth) {
ret = pam_set_prompting_options(pctx->rctx->cdb, pd->service,
pctx->prompting_config_sections,
pctx->num_prompting_config_sections,
CONFDB_PC_TYPE_PASSWORD,
pam_set_password_prompting_options,
&pc_list);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
"pam_set_prompting_options failed.\n");
goto done;
}
}
if (pc_list != NULL) {
ret = pam_get_response_prompt_config(pc_list, &resp_len, &resp_data);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
"pam_get_response_prompt_config failed.\n");
goto done;
}
ret = pam_add_response(pd, SSS_PAM_PROMPT_CONFIG, resp_len, resp_data);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "pam_add_response failed.\n");
goto done;
}
}
ret = EOK;
done:
free(resp_data);
pc_list_free(pc_list);
return ret;
}
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