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Verify passwords

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This commit is contained in:
Drew DeVault 2018-04-03 14:49:56 -04:00
parent 3f21cd441b
commit 89942f511d
1 changed files with 57 additions and 1 deletions
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58
password.c
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@ -1,4 +1,6 @@
#include <assert.h>
#include <pwd.h>
#include <security/pam_appl.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/util/log.h>
@ -7,6 +9,58 @@
#include "swaylock/seat.h"
#include "unicode.h"
static int function_conversation(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *data) {
struct swaylock_password *pw = data;
/* PAM expects an array of responses, one for each message */
struct pam_response *pam_reply = calloc(
num_msg, sizeof(struct pam_response));
*resp = pam_reply;
for (int i = 0; i < num_msg; ++i) {
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_OFF:
case PAM_PROMPT_ECHO_ON:
pam_reply[i].resp = pw->buffer;
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
break;
}
}
return PAM_SUCCESS;
}
static bool attempt_password(struct swaylock_password *pw) {
struct passwd *passwd = getpwuid(getuid());
char *username = passwd->pw_name;
const struct pam_conv local_conversation = {
function_conversation, pw
};
pam_handle_t *local_auth_handle = NULL;
int pam_err;
if ((pam_err = pam_start("swaylock", username,
&local_conversation, &local_auth_handle)) != PAM_SUCCESS) {
wlr_log(L_ERROR, "PAM returned error %d", pam_err);
}
if ((pam_err = pam_authenticate(local_auth_handle, 0)) != PAM_SUCCESS) {
wlr_log(L_ERROR, "pam_authenticate failed");
goto fail;
}
if ((pam_err = pam_end(local_auth_handle, pam_err)) != PAM_SUCCESS) {
wlr_log(L_ERROR, "pam_end failed");
goto fail;
}
// PAM freed this
pw->buffer = NULL;
pw->len = pw->size = 0;
return true;
fail:
// PAM freed this
pw->buffer = NULL;
pw->len = pw->size = 0;
return false;
}
static void backspace(struct swaylock_password *pw) {
if (pw->len != 0) {
pw->buffer[--pw->len] = 0;
@ -43,7 +97,9 @@ void swaylock_handle_key(struct swaylock_state *state,
switch (keysym) {
case XKB_KEY_KP_Enter: /* fallthrough */
case XKB_KEY_Return:
// TODO: Attempt password
if (attempt_password(&state->password)) {
exit(0);
}
break;
case XKB_KEY_BackSpace:
backspace(&state->password);