passwd: rework:
* do not make backup copy by copying (just retain old file) * correctly fall back to /etc/passwd if user is not in shadow * fix bug with overlong passwd entries * be permissive on some kinds of failures * reduce stack usage * code size: -500 bytes
This commit is contained in:
Denis Vlasenko
parent
b8bb27c7ea
commit
ab24e18c7a
@ -117,12 +117,14 @@ int patch_main(int argc, char **argv)
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free(patch_line);
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patch_line = xmalloc_fgets(patch_file);
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}
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/* FIXME: patch_line NULL check?? */
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/* Extract the filename used before the patch was generated */
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original_filename = extract_filename(patch_line, patch_level);
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free(patch_line);
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patch_line = xmalloc_fgets(patch_file);
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/* FIXME: NULL check?? */
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if (strncmp(patch_line, "+++ ", 4) != 0) {
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ret = 2;
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bb_error_msg("invalid patch");
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@ -60,7 +60,7 @@ char *bb_askpass(int timeout, const char * prompt)
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(read did not overwrite it) */
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do {
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if (passwd[i] == '\r' || passwd[i] == '\n')
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passwd[i] = 0;
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passwd[i] = '\0';
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} while (passwd[i++]);
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}
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@ -9,11 +9,9 @@
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libbb.h"
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/* get_line_from_file() - This function reads an entire line from a text file,
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/* This function reads an entire line from a text file,
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* up to a newline or NUL byte. It returns a malloc'ed char * which must be
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* stored and free'ed by the caller. If end is null '\n' isn't considered
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* end of line. If end isn't null, length of the chunk read is stored in it. */
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@ -37,10 +35,12 @@ char *bb_get_chunk_from_file(FILE * file, int *end)
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if (end)
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*end = idx;
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if (linebuf) {
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if (ferror(file)) {
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free(linebuf);
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return NULL;
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}
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// huh, is fgets discards prior data on error like this?
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// I don't think so....
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//if (ferror(file)) {
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// free(linebuf);
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// return NULL;
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//}
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linebuf = xrealloc(linebuf, idx+1);
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linebuf[idx] = 0;
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}
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@ -157,14 +157,14 @@ static const char *obscure_msg(const char *old_p, const char *new_p, const struc
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return NULL;
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}
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int obscure(const char *old, const char *newval, const struct passwd *pwdp)
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int obscure(const char *old, const char *newval, const struct passwd *pw)
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{
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const char *msg;
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if ((msg = obscure_msg(old, newval, pwdp))) {
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printf("Bad password: %s.\n", msg);
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/* If user is root warn only */
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return getuid() ? 1 : 0;
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msg = obscure_msg(old, newval, pw);
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if (msg) {
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printf("Bad password: %s\n", msg);
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return 1;
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}
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return 0;
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}
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@ -6,258 +6,13 @@
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#include "busybox.h"
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#include <syslog.h>
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static char crypt_passwd[128];
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static int create_backup(const char *backup, FILE * fp);
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static int new_password(const struct passwd *pw, int amroot, int algo);
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static void set_filesize_limit(int blocks);
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static int get_algo(char *a)
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static void nuke_str(char *str)
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{
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int x = 1; /* standard: MD5 */
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if (strcasecmp(a, "des") == 0)
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x = 0;
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return x;
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if (str) memset(str, 0, strlen(str));
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}
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static int update_passwd(const struct passwd *pw, const char *crypt_pw)
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{
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char filename[1024];
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char buf[1025];
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char buffer[80];
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char username[32];
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char *pw_rest;
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int mask;
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int continued;
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FILE *fp;
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FILE *out_fp;
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struct stat sb;
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struct flock lock;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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if (access(bb_path_shadow_file, F_OK) == 0) {
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snprintf(filename, sizeof filename, "%s", bb_path_shadow_file);
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} else
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#endif
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{
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snprintf(filename, sizeof filename, "%s", bb_path_passwd_file);
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}
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fp = fopen(filename, "r+");
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if (fp == 0 || fstat(fileno(fp), &sb)) {
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/* return 0; */
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return 1;
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}
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/* Lock the password file before updating */
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 0;
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if (fcntl(fileno(fp), F_SETLK, &lock) < 0) {
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bb_perror_msg("%s", filename);
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return 1;
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}
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lock.l_type = F_UNLCK;
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snprintf(buf, sizeof buf, "%s-", filename);
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if (create_backup(buf, fp)) {
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fcntl(fileno(fp), F_SETLK, &lock);
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fclose(fp);
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return 1;
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}
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snprintf(buf, sizeof buf, "%s+", filename);
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mask = umask(0777);
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out_fp = fopen(buf, "w");
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umask(mask);
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if ((!out_fp) || (fchmod(fileno(out_fp), sb.st_mode & 0777))
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|| (fchown(fileno(out_fp), sb.st_uid, sb.st_gid))) {
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fcntl(fileno(fp), F_SETLK, &lock);
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fclose(fp);
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fclose(out_fp);
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return 1;
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}
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continued = 0;
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snprintf(username, sizeof username, "%s:", pw->pw_name);
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rewind(fp);
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while (!feof(fp)) {
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fgets(buffer, sizeof buffer, fp);
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if (!continued) { /* Check to see if we're updating this line. */
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if (strncmp(username, buffer, strlen(username)) == 0) {
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/* we have a match. */
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pw_rest = strchr(buffer, ':');
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*pw_rest++ = '\0';
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pw_rest = strchr(pw_rest, ':');
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fprintf(out_fp, "%s:%s%s", buffer, crypt_pw, pw_rest);
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} else {
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fputs(buffer, out_fp);
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}
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} else {
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fputs(buffer, out_fp);
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}
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if (buffer[strlen(buffer) - 1] == '\n') {
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continued = 0;
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} else {
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continued = 1;
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}
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memset(buffer, 0, sizeof buffer);
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}
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if (fflush(out_fp) || fsync(fileno(out_fp)) || fclose(out_fp)) {
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unlink(buf);
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fcntl(fileno(fp), F_SETLK, &lock);
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fclose(fp);
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return 1;
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}
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if (rename(buf, filename) < 0) {
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fcntl(fileno(fp), F_SETLK, &lock);
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fclose(fp);
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return 1;
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} else {
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fcntl(fileno(fp), F_SETLK, &lock);
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fclose(fp);
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return 0;
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}
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}
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int passwd_main(int argc, char **argv)
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{
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enum {
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OPT_algo = 0x1, /* -a - password algorithm */
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OPT_lock = 0x2, /* -l - lock account */
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OPT_unlock = 0x4, /* -u - unlock account */
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OPT_delete = 0x8, /* -d - delete password */
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OPT_lud = 0xe,
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};
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unsigned opt;
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char *opt_a;
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int amroot;
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char *cp;
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char *np;
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char *name;
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char *myname;
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int algo = 1;
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const struct passwd *pw;
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amroot = (getuid() == 0);
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openlog("passwd", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
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opt = getopt32(argc, argv, "a:lud", &opt_a);
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argc -= optind;
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argv += optind;
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if (opt & OPT_algo) algo = get_algo(opt_a); // -a
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if ((opt & OPT_lud) && (!argc || !amroot))
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bb_show_usage();
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myname = xstrdup(bb_getpwuid(NULL, getuid(), -1));
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name = myname;
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if (argc) name = argv[0];
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pw = getpwnam(name);
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if (!pw) {
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bb_error_msg_and_die("unknown user %s", name);
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}
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if (!amroot && pw->pw_uid != getuid()) {
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syslog(LOG_WARNING, "can't change pwd for '%s'", name);
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bb_error_msg_and_die("permission denied");
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}
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if (ENABLE_FEATURE_SHADOWPASSWDS) {
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struct spwd *sp = getspnam(name);
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if (!sp) bb_error_msg_and_die("unknown user %s", name);
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cp = sp->sp_pwdp;
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} else cp = pw->pw_passwd;
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np = name;
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safe_strncpy(crypt_passwd, cp, sizeof(crypt_passwd));
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if (!(opt & OPT_lud)) {
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if (!amroot) {
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if (cp[0] == '!') {
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syslog(LOG_WARNING, "password locked for '%s'", np);
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bb_error_msg_and_die("the password for %s cannot be changed", np);
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}
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}
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printf("Changing password for %s\n", name);
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if (new_password(pw, amroot, algo)) {
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bb_error_msg_and_die("the password for %s is unchanged", name);
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}
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} else if (opt & OPT_lock) {
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if (crypt_passwd[0] != '!') {
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memmove(&crypt_passwd[1], crypt_passwd,
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sizeof crypt_passwd - 1);
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crypt_passwd[sizeof crypt_passwd - 1] = '\0';
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crypt_passwd[0] = '!';
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}
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} else if (opt & OPT_unlock) {
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if (crypt_passwd[0] == '!') {
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memmove(crypt_passwd, &crypt_passwd[1],
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sizeof crypt_passwd - 1);
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}
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} else if (opt & OPT_delete) {
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crypt_passwd[0] = '\0';
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}
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set_filesize_limit(30000);
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signal(SIGHUP, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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umask(077);
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xsetuid(0);
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if (!update_passwd(pw, crypt_passwd)) {
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syslog(LOG_INFO, "password for '%s' changed by user '%s'", name,
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myname);
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puts("Password changed");
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} else {
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syslog(LOG_WARNING, "cannot update password file");
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bb_error_msg_and_die("cannot update password file");
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}
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if (ENABLE_FEATURE_CLEAN_UP) free(myname);
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return 0;
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}
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static int create_backup(const char *backup, FILE * fp)
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{
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struct stat sb;
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struct utimbuf ub;
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FILE *bkfp;
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int c, mask;
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if (fstat(fileno(fp), &sb))
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/* return -1; */
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return 1;
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mask = umask(077);
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bkfp = fopen(backup, "w");
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umask(mask);
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if (!bkfp)
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/* return -1; */
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return 1;
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/* TODO: faster copy, not one-char-at-a-time. --marekm */
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rewind(fp);
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while ((c = getc(fp)) != EOF) {
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if (putc(c, bkfp) == EOF)
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break;
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}
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if (c != EOF || fflush(bkfp)) {
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fclose(bkfp);
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/* return -1; */
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return 1;
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}
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if (fclose(bkfp))
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/* return -1; */
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return 1;
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ub.actime = sb.st_atime;
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ub.modtime = sb.st_mtime;
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utime(backup, &ub);
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return 0;
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}
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static int i64c(int i)
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{
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if (i <= 0)
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@ -273,6 +28,7 @@ static int i64c(int i)
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return 'z';
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}
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static char *crypt_make_salt(void)
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{
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time_t now;
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@ -288,85 +44,72 @@ static char *crypt_make_salt(void)
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}
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static int new_password(const struct passwd *pw, int amroot, int algo)
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static char* new_password(const struct passwd *pw, const char *old_crypted,
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uid_t myuid, int algo)
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{
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char *clear;
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char *cipher;
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char *cp;
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char salt[12]; /* "$N$XXXXXXXX" or "XX" */
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char orig[200];
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char pass[200];
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char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
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char *orig = "";
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char *newp = NULL;
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char *cipher = NULL;
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char *cp = NULL;
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char *ret = NULL; /* failure so far */
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if (!amroot && crypt_passwd[0]) {
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clear = bb_askpass(0, "Old password:");
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if (!clear) {
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/* return -1; */
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return 1;
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}
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cipher = pw_encrypt(clear, crypt_passwd);
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if (strcmp(cipher, crypt_passwd) != 0) {
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if (myuid && old_crypted[0]) {
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orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
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if (!orig)
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goto err_ret;
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cipher = pw_encrypt(orig, old_crypted); /* returns ptr to static */
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if (strcmp(cipher, old_crypted) != 0) {
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syslog(LOG_WARNING, "incorrect password for '%s'",
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pw->pw_name);
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pw->pw_name);
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bb_do_delay(FAIL_DELAY);
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puts("Incorrect password");
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/* return -1; */
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return 1;
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goto err_ret;
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}
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safe_strncpy(orig, clear, sizeof(orig));
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memset(clear, 0, strlen(clear));
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memset(cipher, 0, strlen(cipher));
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} else {
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orig[0] = '\0';
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}
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cp = bb_askpass(0, "Enter the new password (minimum of 5 characters).\n"
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orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
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newp = bb_askpass(0, "Enter the new password (minimum of 5 characters).\n"
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"Please use a combination of upper and lower case letters and numbers.\n"
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"Enter new password: ");
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if (!cp ) {
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memset(orig, 0, sizeof orig);
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/* return -1; */
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return 1;
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"Enter new password:"); /* returns ptr to static */
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if (!newp)
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goto err_ret;
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newp = xstrdup(newp); /* we are going to bb_askpass() again, so save it */
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if (obscure(orig, newp, pw)) {
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if (myuid)
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goto err_ret; /* non-root is not allowed to have weak passwd */
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puts("\nWarning: weak password (continuing)");
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}
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safe_strncpy(pass, cp, sizeof(pass));
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memset(cp, 0, strlen(cp));
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/* if (!obscure(orig, pass, pw)) { */
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if (obscure(orig, pass, pw)) {
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if (amroot) {
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puts("\nWarning: weak password (continuing)");
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} else {
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/* return -1; */
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return 1;
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}
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}
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cp = bb_askpass(0, "Re-enter new password: ");
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if (!cp) {
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memset(orig, 0, sizeof orig);
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/* return -1; */
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return 1;
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}
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if (strcmp(cp, pass)) {
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puts("Passwords do not match");
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/* return -1; */
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return 1;
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}
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memset(cp, 0, strlen(cp));
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memset(orig, 0, sizeof(orig));
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memset(salt, 0, sizeof(salt));
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if (algo == 1) {
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cp = bb_askpass(0, "Re-enter new password:");
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if (!cp)
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goto err_ret;
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if (strcmp(cp, newp)) {
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puts("Passwords do not match");
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goto err_ret;
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}
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memset(salt, 0, sizeof(salt));
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if (algo == 1) { /* MD5 */
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strcpy(salt, "$1$");
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strcat(salt, crypt_make_salt());
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strcat(salt, crypt_make_salt());
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strcat(salt, crypt_make_salt());
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}
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|
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strcat(salt, crypt_make_salt());
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cp = pw_encrypt(pass, salt);
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ret = xstrdup(pw_encrypt(newp, salt)); /* returns ptr to static */
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/* whee, success! */
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memset(pass, 0, sizeof pass);
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safe_strncpy(crypt_passwd, cp, sizeof(crypt_passwd));
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return 0;
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err_ret:
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nuke_str(orig);
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if (ENABLE_FEATURE_CLEAN_UP) free(orig);
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nuke_str(newp);
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if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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nuke_str(cipher);
|
||||
nuke_str(cp);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
static void set_filesize_limit(int blocks)
|
||||
{
|
||||
struct rlimit rlimit_fsize;
|
||||
@ -374,3 +117,226 @@ static void set_filesize_limit(int blocks)
|
||||
rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * blocks;
|
||||
setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
|
||||
}
|
||||
|
||||
|
||||
#if 0
|
||||
static int get_algo(char *a)
|
||||
{
|
||||
/* standard: MD5 */
|
||||
int x = 1;
|
||||
if (strcasecmp(a, "des") == 0)
|
||||
x = 0;
|
||||
return x;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
static int update_passwd(const char *filename, const char *username,
|
||||
const char *new_pw)
|
||||
{
|
||||
struct stat sb;
|
||||
struct flock lock;
|
||||
FILE *old_fp;
|
||||
FILE *new_fp;
|
||||
char *new_name;
|
||||
char *last_char;
|
||||
unsigned user_len;
|
||||
int old_fd;
|
||||
int new_fd;
|
||||
int i;
|
||||
int ret = 1; /* failure */
|
||||
|
||||
/* New passwd file, "/etc/passwd+" for now */
|
||||
new_name = xasprintf("%s+", filename);
|
||||
last_char = &new_name[strlen(new_name)-1];
|
||||
username = xasprintf("%s:", username);
|
||||
user_len = strlen(username);
|
||||
|
||||
old_fp = fopen(filename, "r+");
|
||||
if (!old_fp)
|
||||
goto free_mem;
|
||||
old_fd = fileno(old_fp);
|
||||
|
||||
/* Try to create "/etc/passwd+". Wait if it exists. */
|
||||
i = 30;
|
||||
do {
|
||||
// FIXME: on last iteration try w/o O_EXCL but with O_TRUNC?
|
||||
new_fd = open(new_name, O_WRONLY|O_CREAT|O_EXCL,0600);
|
||||
if (new_fd >= 0) goto created;
|
||||
if (errno != EEXIST) break;
|
||||
usleep(100000); /* 0.1 sec */
|
||||
} while (--i);
|
||||
bb_perror_msg("cannot create '%s'", new_name);
|
||||
goto close_old_fp;
|
||||
created:
|
||||
if (!fstat(old_fd, &sb)) {
|
||||
fchmod(new_fd, sb.st_mode & 0777); /* ignore errors */
|
||||
fchown(new_fd, sb.st_uid, sb.st_gid);
|
||||
}
|
||||
new_fp = fdopen(new_fd, "w");
|
||||
if (!new_fp) {
|
||||
close(new_fd);
|
||||
goto unlink_new;
|
||||
}
|
||||
|
||||
/* Backup file is "/etc/passwd-" */
|
||||
last_char[0] = '-';
|
||||
/* Delete old one, create new as a hardlink to current */
|
||||
i = (unlink(new_name) && errno != ENOENT);
|
||||
if (i || link(filename, new_name))
|
||||
bb_perror_msg("warning: cannot create backup copy '%s'", new_name);
|
||||
last_char[0] = '+';
|
||||
|
||||
/* Lock the password file before updating */
|
||||
lock.l_type = F_WRLCK;
|
||||
lock.l_whence = SEEK_SET;
|
||||
lock.l_start = 0;
|
||||
lock.l_len = 0;
|
||||
if (fcntl(old_fd, F_SETLK, &lock) < 0)
|
||||
bb_perror_msg("warning: cannot lock '%s'", filename);
|
||||
lock.l_type = F_UNLCK;
|
||||
|
||||
/* Read current password file, write updated one */
|
||||
while (1) {
|
||||
char *line = xmalloc_fgets(old_fp);
|
||||
if (!line) break; /* EOF/error */
|
||||
if (strncmp(username, line, user_len) == 0) {
|
||||
/* we have a match with "username:"... */
|
||||
const char *cp = line + user_len;
|
||||
/* now cp -> old passwd, skip it: */
|
||||
cp = strchr(cp, ':');
|
||||
if (!cp) cp = "";
|
||||
/* now cp -> ':' after old passwd or -> "" */
|
||||
fprintf(new_fp, "%s%s%s", username, new_pw, cp);
|
||||
/* Erase password in memory */
|
||||
} else
|
||||
fputs(line, new_fp);
|
||||
free(line);
|
||||
}
|
||||
fcntl(old_fd, F_SETLK, &lock);
|
||||
|
||||
/* We do want all of them to execute, thus | instead of || */
|
||||
if ((ferror(old_fp) | fflush(new_fp) | fsync(new_fd) | fclose(new_fp))
|
||||
|| rename(new_name, filename)
|
||||
) {
|
||||
/* At least one of those failed */
|
||||
goto unlink_new;
|
||||
}
|
||||
ret = 0; /* whee, success! */
|
||||
|
||||
unlink_new:
|
||||
if (ret) unlink(new_name);
|
||||
|
||||
close_old_fp:
|
||||
fclose(old_fp);
|
||||
|
||||
free_mem:
|
||||
if (ENABLE_FEATURE_CLEAN_UP) free(new_name);
|
||||
if (ENABLE_FEATURE_CLEAN_UP) free((char*)username);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
int passwd_main(int argc, char **argv)
|
||||
{
|
||||
enum {
|
||||
OPT_algo = 0x1, /* -a - password algorithm */
|
||||
OPT_lock = 0x2, /* -l - lock account */
|
||||
OPT_unlock = 0x4, /* -u - unlock account */
|
||||
OPT_delete = 0x8, /* -d - delete password */
|
||||
OPT_lud = 0xe,
|
||||
STATE_ALGO_md5 = 0x10,
|
||||
STATE_ALGO_des = 0x20,
|
||||
};
|
||||
unsigned opt;
|
||||
char *opt_a = "";
|
||||
const char *filename;
|
||||
char *myname;
|
||||
char *name;
|
||||
char *oldp;
|
||||
char *newp = NULL; /* gcc happiness */
|
||||
const struct passwd *pw;
|
||||
uid_t myuid;
|
||||
|
||||
openlog("passwd", LOG_NOWAIT, LOG_AUTH);
|
||||
opt = getopt32(argc, argv, "a:lud", &opt_a);
|
||||
argc -= optind;
|
||||
argv += optind;
|
||||
|
||||
if (strcasecmp(opt_a, "des") == 0) /* -a */
|
||||
opt |= STATE_ALGO_des;
|
||||
else
|
||||
opt |= STATE_ALGO_md5;
|
||||
myuid = getuid();
|
||||
if ((opt & OPT_lud) && (!argc || myuid))
|
||||
bb_show_usage();
|
||||
|
||||
myname = xstrdup(bb_getpwuid(NULL, myuid, -1));
|
||||
name = myname;
|
||||
if (argc) name = argv[0];
|
||||
|
||||
pw = getpwnam(name);
|
||||
if (!pw) bb_error_msg_and_die("unknown user %s", name);
|
||||
if (myuid && pw->pw_uid != myuid) {
|
||||
syslog(LOG_WARNING, "can't change pwd for '%s'", name);
|
||||
bb_error_msg_and_die("permission denied");
|
||||
}
|
||||
|
||||
filename = bb_path_passwd_file;
|
||||
oldp = pw->pw_passwd;
|
||||
if (ENABLE_FEATURE_SHADOWPASSWDS) {
|
||||
struct spwd *sp = getspnam(name);
|
||||
if (!sp) {
|
||||
bb_error_msg("no shadow record for user %s found, "
|
||||
"changing ordinary password instead", name);
|
||||
} else {
|
||||
filename = bb_path_shadow_file;
|
||||
oldp = sp->sp_pwdp;
|
||||
}
|
||||
}
|
||||
|
||||
/* Decide what the new password will be */
|
||||
if (!(opt & OPT_lud)) {
|
||||
if (myuid) {
|
||||
if (oldp[0] == '!') {
|
||||
syslog(LOG_WARNING, "password locked for '%s'", name);
|
||||
bb_error_msg_and_die("the password for %s cannot be changed", name);
|
||||
}
|
||||
}
|
||||
printf("Changing password for %s\n", name);
|
||||
newp = new_password(pw, oldp,
|
||||
myuid,
|
||||
opt & STATE_ALGO_md5);
|
||||
if (!newp) {
|
||||
bb_error_msg_and_die("the password for %s is unchanged", name);
|
||||
}
|
||||
} else if (opt & OPT_lock) {
|
||||
if (oldp[0] == '!') goto skip;
|
||||
newp = xasprintf("!%s", oldp);
|
||||
} else if (opt & OPT_unlock) {
|
||||
if (oldp[0] != '!') goto skip;
|
||||
newp = xstrdup(oldp + 1);
|
||||
} else if (opt & OPT_delete) {
|
||||
newp = xstrdup("");
|
||||
}
|
||||
|
||||
set_filesize_limit(30000);
|
||||
signal(SIGHUP, SIG_IGN);
|
||||
signal(SIGINT, SIG_IGN);
|
||||
signal(SIGQUIT, SIG_IGN);
|
||||
umask(077);
|
||||
xsetuid(0);
|
||||
if (update_passwd(filename, name, newp) == 0) {
|
||||
syslog(LOG_INFO, "password for '%s' changed by user '%s'", name,
|
||||
myname);
|
||||
puts("Password changed");
|
||||
} else {
|
||||
syslog(LOG_WARNING, "cannot update password file");
|
||||
bb_error_msg_and_die("cannot update password file");
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_CLEAN_UP) free(newp);
|
||||
skip:
|
||||
if (ENABLE_FEATURE_CLEAN_UP) free(myname);
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user