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hlogin
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This commit is contained in:
~keith 2022-05-19 17:20:34 +00:00
parent 235c2ccdee
commit 6e391e2324
Signed by: keith
GPG Key ID: 5BEBEEAB2C73D520
5 changed files with 179 additions and 12 deletions
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3
.gitignore vendored
View File

@ -4,15 +4,18 @@
tmp/
.ccls-cache/
.deps/
.directory
autom4te.cache/
build/
build-aux/
po/*.gmo
po/Makefile
po/Makefile.in
po/POTFILES
po/*.po~
aclocal.m4
config.h
config.in
config.status

5
README.md
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@ -3,3 +3,8 @@ A replacement for `/bin/login` which provides a friendly TUI greeter.
*DISCLAIMER:* While I'm reasonably sure this program is secure, I can't
guarantee that for certain. Use it at your own risk.
## TODO
- [ ] UTF-8 support
- [ ] Respect `/etc/login.defs`
- [ ] Appearance customization

22
hlogin.c
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@ -19,7 +19,6 @@
*/
#include "config.h"
#include <security/_pam_types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
@ -28,8 +27,12 @@
#include "gettext.h"
#include <unistd.h>
#include <sys/types.h>
#include <security/_pam_types.h>
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <syslog.h>
#include <pwd.h>
#include "ui.h"
@ -88,16 +91,27 @@ FAILURE:
return PAM_CONV_ERR;
}
/** number of seconds to hang after a login failure or error **/
unsigned int fail_delay = 3;
int main(int argc, char* argv[])
{
int result;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
openlog("hlogin", LOG_ODELAY, LOG_AUTHPRIV);
pam_handle_t *pam = NULL;
struct pam_conv conv = { .conv = pam_conv_handler, .appdata_ptr = NULL };
if (pam_start("login", NULL, &conv, &pam) != PAM_SUCCESS) {
// TODO log error & pause before exiting
result = pam_start("login", NULL, &conv, &pam);
if (result != PAM_SUCCESS) {
syslog(LOG_ERR, _("Couldn't initialize PAM: %s"), pam_strerror(pam, result));
fprintf(stderr, _("pam_start error: %s. Abort.\n"), pam_strerror(pam, result));
sleep(fail_delay);
return EXIT_FAILURE;
}
@ -105,7 +119,7 @@ int main(int argc, char* argv[])
// prompt for username
ui_setup_dialog(_("Login name:"), false);
int result = ui_run();
result = ui_run();
char *login_name = ui_get_text();
if (result != 0)
goto END;

156
ui.c
View File

@ -20,7 +20,6 @@
#include "config.h"
#include "ui.h"
#include <panel.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
@ -47,6 +46,12 @@ PANEL *login_p;
WINDOW *login_shadow_w;
PANEL *login_shadow_p;
WINDOW *error_w;
PANEL *error_p;
WINDOW *error_shadow_w;
PANEL *error_shadow_p;
const int login_rows = 8;
const int login_cols = 48;
@ -115,6 +120,7 @@ FAILURE:
return unknown_str;
}
/*
char *xgetnisdomainname()
{
size_t len = HOST_NAME_MAX;
@ -136,6 +142,7 @@ char *xgetnisdomainname()
buf[len] = '\0';
return buf;
}
*/
char erase_ch;
@ -154,6 +161,16 @@ void ui_setup_dialog(char *prompt, bool password)
paint_login();
}
void ui_setup_message(char *text)
{
msg = text;
// TODO insert word wrap logic here
int msg_len = strlen(text);
}
/** ui_init - initialize the UI subsystem
*/
void ui_init()
@ -250,9 +267,9 @@ void paint_login()
wmove(login_w, 3, 3);
whline(login_w, ' ', login_cols - 6);
if (!hide_input)
waddnstr(login_w, input_buf, login_cols - 6);
waddnstr(login_w, input_buf + input_scroll, login_cols - 6);
else {
int num_dots = strlen(input_buf);
int num_dots = strlen(input_buf) - input_scroll;
if (num_dots > login_cols - 6)
num_dots = login_cols - 6;
whline(login_w, '*', num_dots);
@ -275,7 +292,7 @@ void paint_login()
int ui_update()
{
paint_back();
wmove(login_w, 3, 3 + input_pos);
wmove(login_w, 3, 3 + input_pos - input_scroll);
update_panels();
doupdate();
@ -290,11 +307,15 @@ int ui_update()
input_backdel_char();
else if (ch == 0x7F || ch == KEY_DC)
input_del_char();
else if (ch == KEY_LEFT && input_pos > 0)
else if (ch == KEY_LEFT && input_pos > 0) {
input_pos--;
else if (ch == KEY_RIGHT && input_pos < strlen(input_buf))
if (input_pos < input_scroll)
input_scroll--;
} else if (ch == KEY_RIGHT && input_pos < strlen(input_buf)) {
input_pos++;
else if (ch == '\t')
if (input_pos >= (input_scroll + login_cols - 6))
input_scroll++;
} else if (ch == '\t')
btn_focus = (btn_focus + 1) % btn_count;
else if (ch == 0x1B) // escape
return -2;
@ -336,6 +357,8 @@ void input_add_char(char ch)
if (input_buf[i] == '\0')
break;
}
if (input_pos >= (input_scroll + login_cols - 6))
input_scroll++;
}
void input_backdel_char()
@ -351,11 +374,13 @@ void input_del_char()
if (input_buf[input_pos] == '\0')
return;
for (int i = input_pos; i < (input_buflen - 1); i++) {
for (int i = input_pos; i < input_buflen - 1; i++) {
input_buf[i] = input_buf[i + 1];
if (input_buf[i] == '\0')
break;
}
if ((input_scroll + login_cols - 6) > strlen(input_buf) && input_scroll > 0)
input_scroll--;
}
const attr_t light = A_BOLD | COLOR_PAIR(3);
@ -383,3 +408,118 @@ void draw_outline(WINDOW *win, int height, int width, int y, int x, bool inset)
wattroff(win, A_ALTCHARSET);
}
/** output_word - used in word_wrap
*/
void output_word(char *word, size_t len,
char **out, size_t *out_size, int *out_pos,
int *line_pos, int *lines, int width)
{
int i = 0;
while (i < len) {
int space = width - (*line_pos);
int remain = len - i;
if (space > remain) { // can fit on line
if ((*out_size) < (*out_pos) + remain) {
*out_size *= 2;
*out = realloc(*out, sizeof(char) * (*out_size));
}
// copy word
memcpy((*out) + (*out_pos), word + i, sizeof(char) * remain);
i += remain;
*out_pos += remain;
*line_pos += remain;
} else {
if ((*out_size) < (*out_pos) + space + 1) {
*out_size *= 2;
*out = realloc(*out, sizeof(char) * (*out_size));
}
// copy part of word
memcpy((*out) + (*out_pos), word + i, sizeof(char) * space);
i += space;
*out_pos += space;
// add newline
(*out)[(*out_pos)++] = '\n';
*line_pos = 0;
(*lines)++;
}
}
}
char *word_wrap(char *text, int width, int max_word, int *lines)
{
// output buffer
size_t out_size = 256;
char *out = malloc(sizeof(char) * out_size);
int out_pos = 0;
// word buffer
char *word = malloc(sizeof(char) * max_word);
int word_len = 0;
int line_pos = 0;
char ch;
while ((ch = *text) != '\0') {
text++;
switch (ch) {
case '\n':
case ' ':
if (word[0] == '\0')
word_len = 0;
// ensure buffer is large enough
if (out_size < out_pos + word_len + 2) {
out_size *= 2;
out = realloc(out, sizeof(char) * out_size);
}
if (word_len > 0) {
// do we have to wrap to a new line?
if (line_pos + word_len > width) {
out[out_pos++] = '\n';
line_pos = 0;
(*lines)++;
}
memcpy(out + out_pos, word, sizeof(char) * word_len);
word_len = 0;
out_pos += word_len;
line_pos += word_len;
}
// output \n
if (ch == '\n' || line_pos >= width) {
out[out_pos++] = '\n';
line_pos = 0;
(*lines)++;
} else {
out[out_pos++] = ' ';
line_pos++;
}
break;
default:
// word longer than word buffer
if (word_len >= max_word) {
if (word[0] != '\0') {
// write what we have
output_word(word, word_len,
&out, &out_size, &out_pos,
&line_pos, lines, width);
word[0] = '\0';
}
// ensure buffer is large enough
if (out_size < out_pos + 2) {
out_size *= 2;
out = realloc(out, sizeof(char) * out_size);
}
// write char and maybe newline
out[out_pos++] = ch;
if ((++line_pos) >= width) {
out[out_pos++] = '\n';
line_pos = 0;
(*lines)++;
}
} else
word[word_len++] = ch;
}
}
free(word);
}

5
ui.h
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@ -17,6 +17,8 @@
* You should have received a copy of the GNU General Public License
* along with hlogin. If not, see <https://www.gnu.org/licenses/>.
*/
#define _XOPEN_SOURCE 600
#ifndef __UI_H
#define __UI_H
@ -31,6 +33,7 @@ void paint_back();
void paint_login();
void ui_setup_dialog(char *prompt, bool password);
void ui_setup_message(char *text);
int ui_update();
int ui_run();
@ -42,4 +45,6 @@ void input_del_char();
void draw_outline(WINDOW *win, int height, int width, int y, int x, bool inset);
char *word_wrap(char *text, int width, int max_word, int *lines);
#endif // __UI_H