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/*
* $Id: afppasswd.c,v 1.11.6.1.2.1 2005/02/10 01:23:07 didg Exp $
*
* Copyright 1999 (c) Adrian Sun (asun@u.washington.edu)
* All Rights Reserved. See COPYRIGHT.
*
* format of the password file:
* name:****************:****************:********
* password last login date failed usage count
*
* ***'s are illegal. they're just place holders for hex values. hex
* values that represent actual numbers are in network byte order.
*
* last login date is currently a 4-byte number representing seconds
* since 1970 (UTC). there's enough space to extend it to 8 bytes.
*
* the last two fields aren't currently used by the randnum uams.
*
* root syntax: afppasswd [-c] [-a] [-p path] [-f] [username]
* user syntax: afppasswd
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#include <pwd.h>
#include <netatalk/endian.h>
#include <des.h>
#ifdef USE_CRACKLIB
#include <crack.h>
#endif /* USE_CRACKLIB */
#define OPT_ISROOT (1 << 0)
#define OPT_CREATE (1 << 1)
#define OPT_FORCE (1 << 2)
#define OPT_ADDUSER (1 << 3)
#define OPT_NOCRACK (1 << 4)
#define PASSWD_ILLEGAL '*'
#define FORMAT ":****************:****************:********\n"
#define FORMAT_LEN 44
#define OPTIONS "cafnu:p:"
#define UID_START 100
#define HEXPASSWDLEN 16
#define PASSWDLEN 8
static char buf[MAXPATHLEN + 1];
/* if newpwd is null, convert buf from hex to binary. if newpwd isn't
* null, convert newpwd to hex and save it in buf. */
#define unhex(x) (isdigit(x) ? (x) - '0' : toupper(x) + 10 - 'A')
static void convert_passwd(char *buf, char *newpwd, const int keyfd)
{
u_int8_t key[HEXPASSWDLEN];
Key_schedule schedule;
unsigned int i, j;
if (!newpwd) {
/* convert to binary */
for (i = j = 0; i < sizeof(key); i += 2, j++)
buf[j] = (unhex(buf[i]) << 4) | unhex(buf[i + 1]);
if (j <= DES_KEY_SZ)
memset(buf + j, 0, sizeof(key) - j);
}
if (keyfd > -1) {
lseek(keyfd, 0, SEEK_SET);
read(keyfd, key, sizeof(key));
/* convert to binary */
for (i = j = 0; i < sizeof(key); i += 2, j++)
key[j] = (unhex(key[i]) << 4) | unhex(key[i + 1]);
if (j <= DES_KEY_SZ)
memset(key + j, 0, sizeof(key) - j);
key_sched((C_Block *) key, schedule);
memset(key, 0, sizeof(key));
if (newpwd) {
ecb_encrypt((C_Block *) newpwd, (C_Block *) newpwd, schedule,
DES_ENCRYPT);
} else {
/* decrypt the password */
ecb_encrypt((C_Block *) buf, (C_Block *) buf, schedule, DES_DECRYPT);
}
memset(&schedule, 0, sizeof(schedule));
}
if (newpwd) {
const unsigned char hextable[] = "0123456789ABCDEF";
/* convert to hex */
for (i = j = 0; i < DES_KEY_SZ; i++, j += 2) {
buf[j] = hextable[(newpwd[i] & 0xF0) >> 4];
buf[j + 1] = hextable[newpwd[i] & 0x0F];
}
}
}
/* this matches the code in uam_randnum.c */
static int update_passwd(const char *path, const char *name, int flags)
{
char password[PASSWDLEN + 1], *p, *passwd;
FILE *fp;
off_t pos;
int keyfd = -1, err = 0;
if ((fp = fopen(path, "r+")) == NULL) {
fprintf(stderr, "afppasswd: can't open %s\n", path);
return -1;
}
/* open the key file if it exists */
strcpy(buf, path);
if (strlen(path) < sizeof(buf) - 5) {
strcat(buf, ".key");
keyfd = open(buf, O_RDONLY);
}
pos = ftell(fp);
memset(buf, 0, sizeof(buf));
while (fgets(buf, sizeof(buf), fp)) {
if ((p = strchr(buf, ':'))) {
/* check for a match */
if (strlen(name) == (p - buf) &&
strncmp(buf, name, p - buf) == 0) {
p++;
if (!(flags & OPT_ISROOT) && (*p == PASSWD_ILLEGAL)) {
fprintf(stderr, "Your password is disabled. Please see your administrator.\n");
break;
}
goto found_entry;
}
}
pos = ftell(fp);
memset(buf, 0, sizeof(buf));
}
if (flags & OPT_ADDUSER) {
strcpy(buf, name);
strcat(buf, FORMAT);
p = strchr(buf, ':') + 1;
fwrite(buf, strlen(buf), 1, fp);
} else {
fprintf(stderr, "afppasswd: can't find %s in %s\n", name, path);
err = -1;
goto update_done;
}
found_entry:
/* need to verify against old password */
if ((flags & OPT_ISROOT) == 0) {
passwd = getpass("Enter OLD AFP password: ");
convert_passwd(p, NULL, keyfd);
if (strncmp(passwd, p, PASSWDLEN)) {
fprintf(stderr, "afppasswd: invalid password.\n");
err = -1;
goto update_done;
}
}
/* new password */
passwd = getpass("Enter NEW AFP password: ");
memcpy(password, passwd, sizeof(password));
password[PASSWDLEN] = '\0';
#ifdef USE_CRACKLIB
if (!(flags & OPT_NOCRACK)) {
if (passwd = FascistCheck(password, _PATH_CRACKLIB)) {
fprintf(stderr, "Error: %s\n", passwd);
err = -1;
goto update_done;
}
}
#endif /* USE_CRACKLIB */
passwd = getpass("Enter NEW AFP password again: ");
if (strcmp(passwd, password) == 0) {
struct flock lock;
int fd = fileno(fp);
convert_passwd(p, password, keyfd);
lock.l_type = F_WRLCK;
lock.l_start = pos;
lock.l_len = 1;
lock.l_whence = SEEK_SET;
fseek(fp, pos, SEEK_SET);
fcntl(fd, F_SETLKW, &lock);
fwrite(buf, p - buf + HEXPASSWDLEN, 1, fp);
lock.l_type = F_UNLCK;
fcntl(fd, F_SETLK, &lock);
printf("afppasswd: updated password.\n");
} else {
fprintf(stderr, "afppasswd: passwords don't match!\n");
err = -1;
}
update_done:
if (keyfd > -1)
close(keyfd);
fclose(fp);
return err;
}
/* creates a file with all the password entries */
static int create_file(const char *path, uid_t minuid)
{
struct passwd *pwd;
int fd, len, err = 0;
if ((fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0600)) < 0) {
fprintf(stderr, "afppasswd: can't create %s\n", path);
return -1;
}
setpwent();
while ((pwd = getpwent())) {
if (pwd->pw_uid < minuid)
continue;
/* a little paranoia */
if (strlen(pwd->pw_name) + FORMAT_LEN > sizeof(buf) - 1)
continue;
strcpy(buf, pwd->pw_name);
strcat(buf, FORMAT);
len = strlen(buf);
if (write(fd, buf, len) != len) {
fprintf(stderr, "afppasswd: problem writing to %s: %s\n", path,
strerror(errno));
err = -1;
break;
}
}
endpwent();
close(fd);
return err;
}
int main(int argc, char **argv)
{
struct stat st;
int flags;
uid_t uid_min = UID_START, uid;
char *path = _PATH_AFPDPWFILE;
int i, err = 0;
extern char *optarg;
extern int optind;
flags = ((uid = getuid()) == 0) ? OPT_ISROOT : 0;
if (((flags & OPT_ISROOT) == 0) && (argc > 1)) {
fprintf(stderr, "Usage: afppasswd [-acfn] [-u minuid] [-p path] [username]\n");
fprintf(stderr, " -a add a new user\n");
fprintf(stderr, " -c create and initialize password file or specific user\n");
fprintf(stderr, " -f force an action\n");
#ifdef USE_CRACKLIB
fprintf(stderr, " -n disable cracklib checking of passwords\n");
#endif /* USE_CRACKLIB */
fprintf(stderr, " -u uid minimum uid to use, defaults to 100\n");
fprintf(stderr, " -p path path to afppasswd file\n");
return -1;
}
while ((i = getopt(argc, argv, OPTIONS)) != EOF) {
switch (i) {
case 'c': /* create and initialize password file or specific user */
flags |= OPT_CREATE;
break;
case 'a': /* add a new user */
flags |= OPT_ADDUSER;
break;
case 'f': /* force an action */
flags |= OPT_FORCE;
break;
case 'u': /* minimum uid to use. default is 100 */
uid_min = atoi(optarg);
break;
#ifdef USE_CRACKLIB
case 'n': /* disable CRACKLIB check */
flags |= OPT_NOCRACK;
break;
#endif /* USE_CRACKLIB */
case 'p': /* path to afppasswd file */
path = optarg;
break;
default:
err++;
break;
}
}
if (err || (optind + ((flags & OPT_CREATE) ? 0 :
(flags & OPT_ISROOT)) != argc)) {
#ifdef USE_CRACKLIB
fprintf(stderr, "Usage: afppasswd [-acfn] [-u minuid] [-p path] [username]\n");
#else /* USE_CRACKLIB */
fprintf(stderr, "Usage: afppasswd [-acf] [-u minuid] [-p path] [username]\n");
#endif /* USE_CRACKLIB */
fprintf(stderr, " -a add a new user\n");
fprintf(stderr, " -c create and initialize password file or specific user\n");
fprintf(stderr, " -f force an action\n");
#ifdef USE_CRACKLIB
fprintf(stderr, " -n disable cracklib checking of passwords\n");
#endif /* USE_CRACKLIB */
fprintf(stderr, " -u uid minimum uid to use, defaults to 100\n");
fprintf(stderr, " -p path path to afppasswd file\n");
return -1;
}
i = stat(path, &st);
if (flags & OPT_CREATE) {
if ((flags & OPT_ISROOT) == 0) {
fprintf(stderr, "afppasswd: only root can create the password file.\n");
return -1;
}
if (!i && ((flags & OPT_FORCE) == 0)) {
fprintf(stderr, "afppasswd: password file already exists.\n");
return -1;
}
return create_file(path, uid_min);
} else {
struct passwd *pwd = NULL;
if (i < 0) {
fprintf(stderr, "afppasswd: %s doesn't exist.\n", path);
return -1;
}
/* if we're root, we need to specify the username */
pwd = (flags & OPT_ISROOT) ? getpwnam(argv[optind]) : getpwuid(uid);
if (pwd)
return update_passwd(path, pwd->pw_name, flags);
fprintf(stderr, "afppasswd: can't get password entry.\n");
return -1;
}
}
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