mirror of
git://git.suckless.org/ubase
synced 2024-12-17 20:24:45 +00:00
passwd: fix /etc/passwd support, ...
... rewrite parts to use libc functions (supported by musl and glibc).
This commit is contained in:
Hiltjo Posthuma
sin
parent
10a539e744
commit
8fdc7d70bd
237
passwd.c
237
passwd.c
@ -25,29 +25,124 @@ usage(void)
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eprintf("usage: %s [username]\n", argv0);
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}
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static int
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gettempfile(char *template)
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static FILE *
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spw_get_file(const char *user)
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{
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int fd;
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FILE *fp = NULL;
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char file[PATH_MAX];
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int r;
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umask(077);
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fd = mkostemp(template, O_RDWR);
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if (fd < 0)
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weprintf("mkstemp:");
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return fd;
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r = snprintf(file, sizeof(file), "/etc/tcb/%s/shadow", user);
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if (r < 0 || (size_t)r >= sizeof(file))
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eprintf("snprintf:");
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fp = fopen(file, "r+");
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if (!fp)
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fp = fopen("/etc/shadow", "r+");
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return fp;
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}
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static int
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spw_write_file(FILE *fp, const struct spwd *spw, char *pwhash)
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{
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struct spwd *spwent;
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int r = -1, w = 0;
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FILE *tfp = NULL;
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/* write to temporary file. */
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tfp = tmpfile();
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if (!tfp) {
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weprintf("tmpfile:");
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goto cleanup;
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}
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while ((spwent = fgetspent(fp))) {
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/* update entry on name match */
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if (strcmp(spwent->sp_namp, spw->sp_namp) == 0) {
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spwent->sp_pwdp = pwhash;
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w++;
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}
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errno = 0;
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if (putspent(spwent, tfp) == -1) {
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weprintf("putspent:");
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goto cleanup;
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}
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}
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if (!w) {
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weprintf("shadow: no matching entry to write to\n");
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goto cleanup;
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}
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fflush(tfp);
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if (fseek(fp, 0, SEEK_SET) == -1 || fseek(tfp, 0, SEEK_SET) == -1) {
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weprintf("fseek:");
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goto cleanup;
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}
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/* write temporary file to (tcb) shadow file */
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concat(tfp, "tmpfile", fp, "shadow");
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ftruncate(fileno(fp), ftell(tfp));
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r = 0; /* success */
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cleanup:
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if (tfp)
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fclose(tfp);
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return r;
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}
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static
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int pw_write_file(FILE *fp, const struct passwd *pw, char *pwhash) {
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struct passwd *pwent;
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int r = -1, w = 0;
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FILE *tfp = NULL;
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/* write to temporary file. */
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tfp = tmpfile();
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if (!tfp) {
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weprintf("tmpfile:");
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goto cleanup;
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}
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while ((pwent = fgetpwent(fp))) {
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/* update entry on name match */
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if (strcmp(pwent->pw_name, pw->pw_name) == 0) {
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pwent->pw_passwd = pwhash;
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w++;
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}
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errno = 0;
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if (putpwent(pwent, tfp) == -1) {
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weprintf("putpwent:");
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goto cleanup;
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}
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}
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if (!w) {
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weprintf("passwd: no matching entry to write to\n");
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goto cleanup;
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}
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fflush(tfp);
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if (fseek(fp, 0, SEEK_SET) == -1 || fseek(tfp, 0, SEEK_SET) == -1) {
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weprintf("fseek:");
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goto cleanup;
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}
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/* write to passwd file. */
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concat(tfp, "tmpfile", fp, "passwd");
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ftruncate(fileno(fp), ftell(tfp));
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r = 0; /* success */
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cleanup:
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if (tfp)
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fclose(tfp);
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return r;
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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 *cryptpass1 = NULL, *cryptpass2 = NULL, *cryptpass3 = NULL;
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char shadowfile[PATH_MAX], *inpass, *p, *pwd = NULL;
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char template[] = "/tmp/pw.XXXXXX";
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char *inpass, *p, *salt = PW_CIPHER, *prevhash = NULL;
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struct passwd *pw;
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struct spwd *spw = NULL, *spwent;
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uid_t uid;
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FILE *fp = NULL, *tfp = NULL;
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int ffd = -1, tfd = -1, r, status = EXIT_FAILURE;
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struct spwd *spw = NULL;
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FILE *fp = NULL;
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int r = -1, status = EXIT_FAILURE;
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ARGBEGIN {
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default:
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@ -55,6 +150,7 @@ main(int argc, char *argv[])
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} ARGEND;
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pw_init();
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umask(077);
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errno = 0;
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if (argc == 0)
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@ -69,7 +165,7 @@ main(int argc, char *argv[])
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}
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/* is using shadow entry ? */
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if (pw->pw_passwd[0] == 'x') {
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if (pw->pw_passwd[0] == 'x' && pw->pw_passwd[1] == '\0') {
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errno = 0;
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spw = getspnam(pw->pw_name);
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if (!spw) {
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@ -78,55 +174,46 @@ main(int argc, char *argv[])
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else
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eprintf("who are you?\n");
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}
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pwd = spw->sp_pwdp;
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} else {
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pwd = pw->pw_passwd;
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}
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uid = getuid();
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if (uid == 0) {
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if (pw->pw_passwd[0] == '!' ||
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pw->pw_passwd[0] == 'x' ||
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pw->pw_passwd[0] == '*' ||
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pw->pw_passwd[0] == '\0')
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pw->pw_passwd = PW_CIPHER;
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/* Flush pending input */
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ioctl(STDIN_FILENO, TCFLSH, (void *)0);
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if (getuid() == 0) {
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goto newpass;
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} else {
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if (pw->pw_passwd[0] == '!' ||
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pw->pw_passwd[0] == '*')
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eprintf("denied\n");
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if (pw->pw_passwd[0] == '\0') {
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pw->pw_passwd = PW_CIPHER;
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goto newpass;
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}
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if (pw->pw_passwd[0] == 'x')
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prevhash = salt = spw->sp_pwdp;
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else
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prevhash = salt = pw->pw_passwd;
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}
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/* Flush pending input */
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ioctl(STDIN_FILENO, TCFLSH, (void *)0);
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printf("Changing password for %s\n", pw->pw_name);
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inpass = getpass("Old password: ");
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if (!inpass)
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eprintf("getpass:");
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if (inpass[0] == '\0')
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eprintf("no password supplied\n");
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p = crypt(inpass, pwd);
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p = crypt(inpass, salt);
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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, pwd) != 0)
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if (strcmp(cryptpass1, prevhash) != 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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inpass = getpass("Enter new password: ");
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if (!inpass)
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eprintf("getpass:");
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if (inpass[0] == '\0')
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eprintf("no password supplied\n");
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p = crypt(inpass, pwd);
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p = crypt(inpass, salt);
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if (!p)
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eprintf("crypt:");
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cryptpass2 = estrdup(p);
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@ -141,88 +228,28 @@ newpass:
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eprintf("getpass:");
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if (inpass[0] == '\0')
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eprintf("no password supplied\n");
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p = crypt(inpass, pwd);
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p = crypt(inpass, salt);
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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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r = snprintf(shadowfile, sizeof(shadowfile), "/etc/tcb/%s/shadow", pw->pw_name);
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if (r < 0 || (size_t)r >= sizeof(shadowfile))
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eprintf("snprintf:");
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fp = fopen(shadowfile, "r+");
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if (!fp) {
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strlcpy(shadowfile, "/etc/shadow", sizeof(shadowfile));
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fp = fopen(shadowfile, "r+");
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}
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fp = spw_get_file(pw->pw_name);
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if (fp) {
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if ((tfd = gettempfile(template)) == -1)
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goto cleanup;
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/* write to (tcb) shadow file. */
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if (!(tfp = fdopen(tfd, "w+"))) {
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weprintf("fdopen:");
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goto cleanup;
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}
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while ((spwent = fgetspent(fp))) {
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/* update entry on name match */
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if (strcmp(spwent->sp_namp, spw->sp_namp) == 0)
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spwent->sp_pwdp = cryptpass3;
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errno = 0;
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if (putspent(spwent, tfp) == -1) {
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weprintf("putspent:");
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goto cleanup;
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}
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}
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fflush(tfp);
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if (fseek(fp, 0, SEEK_SET) == -1 || fseek(tfp, 0, SEEK_SET) == -1) {
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weprintf("rewind:");
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goto cleanup;
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}
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/* old shadow file with temporary file data. */
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concat(tfp, template, fp, shadowfile);
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ftruncate(tfd, ftell(tfp));
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r = spw_write_file(fp, spw, cryptpass3);
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} else {
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/* write to /etc/passwd file. */
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ffd = open("/etc/passwd", O_RDWR);
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if (ffd < 0) {
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weprintf("open %s:", "/etc/passwd");
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goto cleanup;
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}
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pw->pw_passwd = cryptpass3;
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if ((tfd = gettempfile(template)) == -1)
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goto cleanup;
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r = pw_copy(ffd, tfd, pw);
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if (r < 0)
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goto cleanup;
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r = lseek(ffd, 0, SEEK_SET);
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if (r < 0)
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goto cleanup;
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r = lseek(tfd, 0, SEEK_SET);
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if (r < 0)
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goto cleanup;
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r = pw_copy(tfd, ffd, NULL);
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if (r < 0)
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goto cleanup;
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fp = fopen("/etc/passwd", "r+");
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if (fp)
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r = pw_write_file(fp, pw, cryptpass3);
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else
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weprintf("fopen:");
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}
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status = EXIT_SUCCESS;
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if (!r)
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status = EXIT_SUCCESS;
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cleanup:
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if (fp)
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fclose(fp);
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if (tfp)
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fclose(tfp);
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if (tfd != -1) {
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close(tfd);
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unlink(template);
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}
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if (ffd != -1)
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close(ffd);
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free(cryptpass3);
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free(cryptpass2);
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free(cryptpass1);
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4
passwd.h
4
passwd.h
@ -1,6 +1,4 @@
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/* See LICENSE file for copyright and license details. */
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/* passwd.c */
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int pw_check(struct passwd *, const char *);
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int pw_copy(int, int, const struct passwd *);
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int pw_check(const struct passwd *, const char *);
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int pw_init(void);
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int pw_scan(char *, struct passwd *);
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109
util/passwd.c
109
util/passwd.c
@ -17,7 +17,7 @@
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/* Returns -1 on error, 0 for incorrect password
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* and 1 if all went OK */
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int
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pw_check(struct passwd *pw, const char *pass)
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pw_check(const struct passwd *pw, const char *pass)
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{
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char *cryptpass, *p;
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struct spwd *spw;
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@ -64,53 +64,6 @@ pw_check(struct passwd *pw, const char *pass)
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return 1;
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}
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int
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pw_copy(int ffd, int tfd, const struct passwd *newpw)
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{
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struct passwd pw;
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char *buf = NULL, *p;
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size_t size = 0;
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FILE *from, *to;
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from = fdopen(ffd, "r");
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if (!from) {
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weprintf("fdopen:");
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return -1;
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}
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to = fdopen(tfd, "w");
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if (!to) {
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weprintf("fdopen:");
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return -1;
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}
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while (agetline(&buf, &size, from) != -1) {
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p = strdup(buf);
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if (!p) {
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weprintf("strdup:");
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return -1;
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}
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if (newpw) {
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if (pw_scan(p, &pw) < 0)
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return -1;
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if (strcmp(pw.pw_name, newpw->pw_name) == 0) {
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fprintf(to, "%s:%s:%u:%u:%s:%s:%s\n",
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newpw->pw_name,
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newpw->pw_passwd,
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newpw->pw_uid,
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newpw->pw_gid,
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newpw->pw_gecos,
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newpw->pw_dir,
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newpw->pw_shell);
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continue;
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}
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}
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fprintf(to, "%s", buf);
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free(p);
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}
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fflush(to);
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free(buf);
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return 0;
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}
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int
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pw_init(void)
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{
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@ -122,63 +75,3 @@ pw_init(void)
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eprintf("setrlimit:");
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return 0;
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}
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int
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pw_scan(char *bp, struct passwd *pw)
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{
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char *p;
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memset(pw, 0, sizeof(*pw));
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/* login name */
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p = strsep(&bp, ":");
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if (!p || *p == '\0')
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goto corrupt;
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pw->pw_name = p;
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/* passwd */
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p = strsep(&bp, ":");
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if (!p)
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goto corrupt;
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pw->pw_passwd = p;
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/* uid */
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p = strsep(&bp, ":");
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if (!p)
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goto corrupt;
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pw->pw_uid = estrtol(p, 10);
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/* gid */
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p = strsep(&bp, ":");
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if (!p)
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goto corrupt;
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pw->pw_gid = estrtol(p, 10);
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/* user name or comment */
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p = strsep(&bp, ":");
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if (!p)
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goto corrupt;
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pw->pw_gecos = p;
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/* home directory */
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p = strsep(&bp, ":");
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if (!p)
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goto corrupt;
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pw->pw_dir = p;
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/* optional shell */
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p = strsep(&bp, ":");
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if (!p)
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goto corrupt;
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pw->pw_shell = p;
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/* look for redundant entries */
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p = strsep(&bp, ":");
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if (p)
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goto corrupt;
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return 0;
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corrupt:
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weprintf("corrupted passwd entry\n");
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return -1;
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}
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