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126 lines
3.1 KiB
126 lines
3.1 KiB
#include <assert.h>
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#include <pwd.h>
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#include <security/pam_appl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <wlr/util/log.h>
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#include <xkbcommon/xkbcommon.h>
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#include "swaylock/swaylock.h"
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#include "swaylock/seat.h"
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#include "unicode.h"
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static int function_conversation(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *data) {
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struct swaylock_password *pw = data;
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/* PAM expects an array of responses, one for each message */
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struct pam_response *pam_reply = calloc(
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num_msg, sizeof(struct pam_response));
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*resp = pam_reply;
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for (int 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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case PAM_PROMPT_ECHO_ON:
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pam_reply[i].resp = pw->buffer;
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break;
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case PAM_ERROR_MSG:
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case PAM_TEXT_INFO:
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break;
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}
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}
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return PAM_SUCCESS;
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}
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static bool attempt_password(struct swaylock_password *pw) {
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struct passwd *passwd = getpwuid(getuid());
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char *username = passwd->pw_name;
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const struct pam_conv local_conversation = {
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function_conversation, pw
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};
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pam_handle_t *local_auth_handle = NULL;
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int pam_err;
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if ((pam_err = pam_start("swaylock", username,
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&local_conversation, &local_auth_handle)) != PAM_SUCCESS) {
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wlr_log(L_ERROR, "PAM returned error %d", pam_err);
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}
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if ((pam_err = pam_authenticate(local_auth_handle, 0)) != PAM_SUCCESS) {
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wlr_log(L_ERROR, "pam_authenticate failed");
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goto fail;
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}
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if ((pam_err = pam_end(local_auth_handle, pam_err)) != PAM_SUCCESS) {
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wlr_log(L_ERROR, "pam_end failed");
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goto fail;
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}
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// PAM frees this
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pw->buffer = NULL;
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pw->len = pw->size = 0;
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return true;
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fail:
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// PAM frees this
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pw->buffer = NULL;
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pw->len = pw->size = 0;
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return false;
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}
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static bool backspace(struct swaylock_password *pw) {
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if (pw->len != 0) {
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pw->buffer[--pw->len] = 0;
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return true;
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}
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return false;
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}
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static void append_ch(struct swaylock_password *pw, uint32_t codepoint) {
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if (!pw->buffer) {
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pw->size = 8;
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if (!(pw->buffer = malloc(pw->size))) {
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// TODO: Display error
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return;
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}
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pw->buffer[0] = 0;
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}
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size_t utf8_size = utf8_chsize(codepoint);
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if (pw->len + utf8_size + 1 >= pw->size) {
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size_t size = pw->size * 2;
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char *buffer = realloc(pw->buffer, size);
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if (!buffer) {
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// TODO: Display error
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return;
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}
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pw->size = size;
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pw->buffer = buffer;
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}
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utf8_encode(&pw->buffer[pw->len], codepoint);
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pw->buffer[pw->len + utf8_size] = 0;
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pw->len += utf8_size;
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}
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void swaylock_handle_key(struct swaylock_state *state,
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xkb_keysym_t keysym, uint32_t codepoint) {
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switch (keysym) {
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case XKB_KEY_KP_Enter: /* fallthrough */
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case XKB_KEY_Return:
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state->auth_state = AUTH_STATE_VALIDATING;
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render_frames(state);
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if (attempt_password(&state->password)) {
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exit(0);
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}
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state->auth_state = AUTH_STATE_INVALID;
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render_frames(state);
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break;
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case XKB_KEY_BackSpace:
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if (backspace(&state->password)) {
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state->auth_state = AUTH_STATE_BACKSPACE;
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render_frames(state);
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}
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break;
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default:
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if (codepoint) {
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append_ch(&state->password, codepoint);
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state->auth_state = AUTH_STATE_INPUT;
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render_frames(state);
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}
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break;
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}
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// TODO: Expire state in a few seconds
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}
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