mirror of
git://git.suckless.org/ubase
synced 2024-12-18 04:34:43 +00:00
143 lines
2.6 KiB
C
143 lines
2.6 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "passwd.h"
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s login\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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char *pass, *cryptpass1, *cryptpass2, *cryptpass3;
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char *p;
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char template[] = "/tmp/pw.XXXXXX";
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struct passwd *pw;
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int ffd, tfd;
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int r;
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ARGBEGIN {
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default:
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usage();
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} ARGEND;
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if (argc != 1)
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usage();
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errno = 0;
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pw = getpwnam(argv[0]);
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if (errno)
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eprintf("getpwnam: %s:", argv[0]);
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else if (!pw)
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eprintf("who are you?\n");
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switch (pw->pw_passwd[0]) {
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case '!':
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case '*':
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eprintf("denied\n");
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}
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if (pw->pw_passwd[0] == '\0')
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goto newpass;
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if (pw->pw_passwd[0] == 'x' && pw->pw_passwd[1] == '\0')
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eprintf("no shadow support\n");
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/* Flush pending input */
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ioctl(STDIN_FILENO, TCFLSH, (void *)0);
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pass = getpass("Current password: ");
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putchar('\n');
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if (!pass)
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eprintf("getpass:");
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p = crypt(pass, pw->pw_passwd);
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if (!p)
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eprintf("crypt:");
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cryptpass1 = estrdup(p);
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if (strcmp(cryptpass1, pw->pw_passwd) != 0)
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eprintf("incorrect password\n");
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newpass:
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/* Flush pending input */
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ioctl(STDIN_FILENO, TCFLSH, (void *)0);
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pass = getpass("Enter new password: ");
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putchar('\n');
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if (!pass)
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eprintf("getpass:");
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p = crypt(pass, pw->pw_passwd);
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if (!p)
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eprintf("crypt:");
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cryptpass2 = estrdup(p);
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if (strcmp(cryptpass1, cryptpass2) == 0)
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eprintf("password left unchanged\n");
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/* Flush pending input */
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ioctl(STDIN_FILENO, TCFLSH, (void *)0);
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pass = getpass("Retype new password: ");
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putchar('\n');
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if (!pass)
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eprintf("getpass:");
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p = crypt(pass, pw->pw_passwd);
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if (!p)
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eprintf("crypt:");
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cryptpass3 = estrdup(p);
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if (strcmp(cryptpass2, cryptpass3) != 0)
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eprintf("passwords don't match\n");
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pw->pw_passwd = cryptpass3;
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ffd = open("/etc/passwd", O_RDWR);
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if (ffd < 0)
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eprintf("open %s:", "/etc/passwd");
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tfd = mkostemp(template, O_RDWR);
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if (tfd < 0)
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eprintf("mkstemp:");
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r = pw_copy(ffd, tfd, pw);
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if (r < 0) {
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unlink(template);
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exit(EXIT_FAILURE);
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}
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r = lseek(ffd, 0, SEEK_SET);
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if (r < 0) {
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unlink(template);
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exit(EXIT_FAILURE);
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}
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r = lseek(tfd, 0, SEEK_SET);
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if (r < 0) {
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unlink(template);
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exit(EXIT_FAILURE);
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}
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r = pw_copy(tfd, ffd, NULL);
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if (r < 0) {
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unlink(template);
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exit(EXIT_FAILURE);
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}
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close(tfd);
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close(ffd);
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unlink(template);
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free(cryptpass3);
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free(cryptpass2);
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free(cryptpass1);
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return EXIT_SUCCESS;
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}
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