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https://gitlab.freedesktop.org/wayland/weston
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0733c8f571
Add user authentication support for remote backends via PAM. This requires a configuration file /etc/pam.d/weston. Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* Copyright © 2022 Philipp Zabel
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "config.h"
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#include <shared/xalloc.h>
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#include <stdbool.h>
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#include "libweston-internal.h"
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#ifdef HAVE_PAM
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#include <security/pam_appl.h>
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#include <security/pam_misc.h>
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static int
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weston_pam_conv(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *appdata_ptr)
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{
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const char *password = appdata_ptr;
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struct pam_response *rsp;
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int i;
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if (!num_msg)
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return PAM_CONV_ERR;
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rsp = calloc(num_msg, sizeof(*rsp));
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if (!rsp)
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return PAM_CONV_ERR;
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for (i = 0; i < num_msg; i++) {
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switch (msg[i]->msg_style) {
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case PAM_PROMPT_ECHO_OFF:
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rsp[i].resp = strdup(password);
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break;
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case PAM_PROMPT_ECHO_ON:
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break;
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case PAM_ERROR_MSG:
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weston_log("PAM error message: %s\n", msg[i]->msg);
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break;
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case PAM_TEXT_INFO:
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weston_log("PAM info text: %s\n", msg[i]->msg);
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break;
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default:
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free(rsp);
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return PAM_CONV_ERR;
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}
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}
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*resp = rsp;
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return PAM_SUCCESS;
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}
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#endif
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WL_EXPORT bool
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weston_authenticate_user(const char *username, const char *password)
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{
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bool authenticated = false;
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#ifdef HAVE_PAM
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struct pam_conv conv = {
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.conv = weston_pam_conv,
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.appdata_ptr = strdup(password),
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};
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struct pam_handle *pam;
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int ret;
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conv.appdata_ptr = strdup(password);
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ret = pam_start("weston-remote-access", username, &conv, &pam);
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if (ret != PAM_SUCCESS) {
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weston_log("PAM: start failed\n");
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goto out;
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}
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ret = pam_authenticate(pam, 0);
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if (ret != PAM_SUCCESS) {
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weston_log("PAM: authentication failed\n");
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goto out;
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}
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ret = pam_acct_mgmt(pam, 0);
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if (ret != PAM_SUCCESS) {
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weston_log("PAM: account check failed\n");
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goto out;
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}
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authenticated = true;
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out:
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ret = pam_end(pam, ret);
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assert(ret == PAM_SUCCESS);
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free(conv.appdata_ptr);
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#endif
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return authenticated;
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}
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