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apache/support/htpasswd.c
Thom May a1d5470e1e htpasswd.c: various cleanups and move to using apr_temp_dir_get() 
Submitted by: Guenter Knauf
Reviewed by: Thom May


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102950 13f79535-47bb-0310-9956-ffa450edef68
2004-03-13 22:18:19 +00:00

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/* Copyright 1999-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/******************************************************************************
******************************************************************************
* NOTE! This program is not safe as a setuid executable! Do not make it
* setuid!
******************************************************************************
*****************************************************************************/
/*
* htpasswd.c: simple program for manipulating password file for
* the Apache HTTP server
*
* Originally by Rob McCool
*
* Exit values:
* 0: Success
* 1: Failure; file access/permission problem
* 2: Failure; command line syntax problem (usage message issued)
* 3: Failure; password verification failure
* 4: Failure; operation interrupted (such as with CTRL/C)
* 5: Failure; buffer would overflow (username, filename, or computed
* record too long)
* 6: Failure; username contains illegal or reserved characters
* 7: Failure; file is not a valid htpasswd file
*/
#include "apr.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_errno.h"
#include "apr_file_io.h"
#include "apr_general.h"
#include "apr_signal.h"
#if APR_HAVE_STDIO_H
#include <stdio.h>
#endif
#include "apr_md5.h"
#include "apr_sha1.h"
#include <time.h>
#if APR_HAVE_CRYPT_H
#include <crypt.h>
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef WIN32
#include <conio.h>
#define unlink _unlink
#endif
#if !APR_CHARSET_EBCDIC
#define LF 10
#define CR 13
#else /*APR_CHARSET_EBCDIC*/
#define LF '\n'
#define CR '\r'
#endif /*APR_CHARSET_EBCDIC*/
#define MAX_STRING_LEN 256
#define ALG_PLAIN 0
#define ALG_CRYPT 1
#define ALG_APMD5 2
#define ALG_APSHA 3
#define ERR_FILEPERM 1
#define ERR_SYNTAX 2
#define ERR_PWMISMATCH 3
#define ERR_INTERRUPTED 4
#define ERR_OVERFLOW 5
#define ERR_BADUSER 6
#define ERR_INVALID 7
#define APHTP_NEWFILE 1
#define APHTP_NOFILE 2
#define APHTP_NONINTERACTIVE 4
#define APHTP_DELUSER 8
apr_file_t *errfile;
apr_file_t *ftemp = NULL;
static void to64(char *s, unsigned long v, int n)
{
static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
static void putline(apr_file_t *f, const char *l)
{
apr_file_puts(l, f);
}
/*
* Make a password record from the given information. A zero return
* indicates success; failure means that the output buffer contains an
* error message instead.
*/
static int mkrecord(char *user, char *record, apr_size_t rlen, char *passwd,
int alg)
{
char *pw;
char cpw[120];
char pwin[MAX_STRING_LEN];
char pwv[MAX_STRING_LEN];
char salt[9];
apr_size_t bufsize;
if (passwd != NULL) {
pw = passwd;
}
else {
bufsize = sizeof(pwin);
if (apr_password_get("New password: ", pwin, &bufsize) != 0) {
apr_snprintf(record, (rlen - 1), "password too long (>%"
APR_SIZE_T_FMT ")", sizeof(pwin) - 1);
return ERR_OVERFLOW;
}
bufsize = sizeof(pwv);
apr_password_get("Re-type new password: ", pwv, &bufsize);
if (strcmp(pwin, pwv) != 0) {
apr_cpystrn(record, "password verification error", (rlen - 1));
return ERR_PWMISMATCH;
}
pw = pwin;
memset(pwv, '\0', sizeof(pwin));
}
switch (alg) {
case ALG_APSHA:
/* XXX cpw >= 28 + strlen(sha1) chars - fixed len SHA */
apr_sha1_base64(pw,strlen(pw),cpw);
break;
case ALG_APMD5:
(void) srand((int) time((time_t *) NULL));
to64(&salt[0], rand(), 8);
salt[8] = '\0';
apr_md5_encode((const char *)pw, (const char *)salt,
cpw, sizeof(cpw));
break;
case ALG_PLAIN:
/* XXX this len limitation is not in sync with any HTTPd len. */
apr_cpystrn(cpw,pw,sizeof(cpw));
break;
#if !(defined(WIN32) || defined(NETWARE))
case ALG_CRYPT:
default:
(void) srand((int) time((time_t *) NULL));
to64(&salt[0], rand(), 8);
salt[8] = '\0';
apr_cpystrn(cpw, (char *)crypt(pw, salt), sizeof(cpw) - 1);
break;
#endif
}
memset(pw, '\0', strlen(pw));
/*
* Check to see if the buffer is large enough to hold the username,
* hash, and delimiters.
*/
if ((strlen(user) + 1 + strlen(cpw)) > (rlen - 1)) {
apr_cpystrn(record, "resultant record too long", (rlen - 1));
return ERR_OVERFLOW;
}
strcpy(record, user);
strcat(record, ":");
strcat(record, cpw);
strcat(record, "\n");
return 0;
}
static void usage(void)
{
apr_file_printf(errfile, "Usage:\n");
apr_file_printf(errfile, "\thtpasswd [-cmdpsD] passwordfile username\n");
apr_file_printf(errfile, "\thtpasswd -b[cmdpsD] passwordfile username "
"password\n\n");
apr_file_printf(errfile, "\thtpasswd -n[mdps] username\n");
apr_file_printf(errfile, "\thtpasswd -nb[mdps] username password\n");
apr_file_printf(errfile, " -c Create a new file.\n");
apr_file_printf(errfile, " -n Don't update file; display results on "
"stdout.\n");
apr_file_printf(errfile, " -m Force MD5 encryption of the password"
#if defined(WIN32) || defined(TPF) || defined(NETWARE)
" (default)"
#endif
".\n");
apr_file_printf(errfile, " -d Force CRYPT encryption of the password"
#if (!(defined(WIN32) || defined(TPF) || defined(NETWARE)))
" (default)"
#endif
".\n");
apr_file_printf(errfile, " -p Do not encrypt the password (plaintext).\n");
apr_file_printf(errfile, " -s Force SHA encryption of the password.\n");
apr_file_printf(errfile, " -b Use the password from the command line "
"rather than prompting for it.\n");
apr_file_printf(errfile, " -D Delete the specified user.\n");
apr_file_printf(errfile,
"On Windows, NetWare and TPF systems the '-m' flag is used by "
"default.\n");
apr_file_printf(errfile,
"On all other systems, the '-p' flag will probably not work.\n");
exit(ERR_SYNTAX);
}
/*
* Check to see if the specified file can be opened for the given
* access.
*/
static int accessible(apr_pool_t *pool, char *fname, int mode)
{
apr_file_t *f = NULL;
if (apr_file_open(&f, fname, mode, APR_OS_DEFAULT, pool) != APR_SUCCESS) {
return 0;
}
apr_file_close(f);
return 1;
}
/*
* Return true if the named file exists, regardless of permissions.
*/
static int exists(char *fname, apr_pool_t *pool)
{
apr_finfo_t sbuf;
apr_status_t check;
check = apr_stat(&sbuf, fname, APR_FINFO_TYPE, pool);
return ((check || sbuf.filetype != APR_REG) ? 0 : 1);
}
static void terminate(void)
{
apr_terminate();
#ifdef NETWARE
pressanykey();
#endif
}
static void check_args(apr_pool_t *pool, int argc, const char *const argv[],
int *alg, int *mask, char **user, char **pwfilename,
char **password)
{
const char *arg;
int args_left = 2;
int i;
/*
* Preliminary check to make sure they provided at least
* three arguments, we'll do better argument checking as
* we parse the command line.
*/
if (argc < 3) {
usage();
}
/*
* Go through the argument list and pick out any options. They
* have to precede any other arguments.
*/
for (i = 1; i < argc; i++) {
arg = argv[i];
if (*arg != '-') {
break;
}
while (*++arg != '\0') {
if (*arg == 'c') {
*mask |= APHTP_NEWFILE;
}
else if (*arg == 'n') {
*mask |= APHTP_NOFILE;
args_left--;
}
else if (*arg == 'm') {
*alg = ALG_APMD5;
}
else if (*arg == 's') {
*alg = ALG_APSHA;
}
else if (*arg == 'p') {
*alg = ALG_PLAIN;
}
else if (*arg == 'd') {
*alg = ALG_CRYPT;
}
else if (*arg == 'b') {
*mask |= APHTP_NONINTERACTIVE;
args_left++;
}
else if (*arg == 'D') {
*mask |= APHTP_DELUSER;
}
else {
usage();
}
}
}
if ((*mask & APHTP_NEWFILE) && (*mask & APHTP_NOFILE)) {
apr_file_printf(errfile, "%s: -c and -n options conflict\n", argv[0]);
exit(ERR_SYNTAX);
}
if ((*mask & APHTP_NEWFILE) && (*mask & APHTP_DELUSER)) {
apr_file_printf(errfile, "%s: -c and -D options conflict\n", argv[0]);
exit(ERR_SYNTAX);
}
if ((*mask & APHTP_NOFILE) && (*mask & APHTP_DELUSER)) {
apr_file_printf(errfile, "%s: -n and -D options conflict\n", argv[0]);
exit(ERR_SYNTAX);
}
/*
* Make sure we still have exactly the right number of arguments left
* (the filename, the username, and possibly the password if -b was
* specified).
*/
if ((argc - i) != args_left) {
usage();
}
if (*mask & APHTP_NOFILE) {
i--;
}
else {
if (strlen(argv[i]) > (APR_PATH_MAX - 1)) {
apr_file_printf(errfile, "%s: filename too long\n", argv[0]);
exit(ERR_OVERFLOW);
}
*pwfilename = apr_pstrdup(pool, argv[i]);
if (strlen(argv[i + 1]) > (MAX_STRING_LEN - 1)) {
apr_file_printf(errfile, "%s: username too long (> %d)\n",
argv[0], MAX_STRING_LEN - 1);
exit(ERR_OVERFLOW);
}
}
*user = apr_pstrdup(pool, argv[i + 1]);
if ((arg = strchr(*user, ':')) != NULL) {
apr_file_printf(errfile, "%s: username contains illegal "
"character '%c'\n", argv[0], *arg);
exit(ERR_BADUSER);
}
if (*mask & APHTP_NONINTERACTIVE) {
if (strlen(argv[i + 2]) > (MAX_STRING_LEN - 1)) {
apr_file_printf(errfile, "%s: password too long (> %d)\n",
argv[0], MAX_STRING_LEN);
exit(ERR_OVERFLOW);
}
*password = apr_pstrdup(pool, argv[i + 2]);
}
}
/*
* Let's do it. We end up doing a lot of file opening and closing,
* but what do we care? This application isn't run constantly.
*/
int main(int argc, const char * const argv[])
{
apr_file_t *fpw = NULL;
char record[MAX_STRING_LEN];
char line[MAX_STRING_LEN];
char *password = NULL;
char *pwfilename = NULL;
char *user = NULL;
char tn[] = "htpasswd.tmp.XXXXXX";
char *dirname;
char scratch[MAX_STRING_LEN];
int found = 0;
int i;
int alg = ALG_CRYPT;
int mask = 0;
apr_pool_t *pool;
int existing_file = 0;
#if APR_CHARSET_EBCDIC
apr_status_t rv;
apr_xlate_t *to_ascii;
#endif
apr_app_initialize(&argc, &argv, NULL);
atexit(terminate);
apr_pool_create(&pool, NULL);
apr_file_open_stderr(&errfile, pool);
#if APR_CHARSET_EBCDIC
rv = apr_xlate_open(&to_ascii, "ISO8859-1", APR_DEFAULT_CHARSET, pool);
if (rv) {
apr_file_printf(errfile, "apr_xlate_open(to ASCII)->%d\n", rv);
exit(1);
}
rv = apr_SHA1InitEBCDIC(to_ascii);
if (rv) {
apr_file_printf(errfile, "apr_SHA1InitEBCDIC()->%d\n", rv);
exit(1);
}
rv = apr_MD5InitEBCDIC(to_ascii);
if (rv) {
apr_file_printf(errfile, "apr_MD5InitEBCDIC()->%d\n", rv);
exit(1);
}
#endif /*APR_CHARSET_EBCDIC*/
check_args(pool, argc, argv, &alg, &mask, &user, &pwfilename, &password);
#if defined(WIN32) || defined(NETWARE)
if (alg == ALG_CRYPT) {
alg = ALG_APMD5;
apr_file_printf(errfile, "Automatically using MD5 format.\n");
}
#endif
#if (!(defined(WIN32) || defined(TPF) || defined(NETWARE)))
if (alg == ALG_PLAIN) {
apr_file_printf(errfile,"Warning: storing passwords as plain text "
"might just not work on this platform.\n");
}
#endif
/*
* Only do the file checks if we're supposed to frob it.
*/
if (!(mask & APHTP_NOFILE)) {
existing_file = exists(pwfilename, pool);
if (existing_file) {
/*
* Check that this existing file is readable and writable.
*/
if (!accessible(pool, pwfilename, APR_READ | APR_APPEND)) {
apr_file_printf(errfile, "%s: cannot open file %s for "
"read/write access\n", argv[0], pwfilename);
exit(ERR_FILEPERM);
}
}
else {
/*
* Error out if -c was omitted for this non-existant file.
*/
if (!(mask & APHTP_NEWFILE)) {
apr_file_printf(errfile,
"%s: cannot modify file %s; use '-c' to create it\n",
argv[0], pwfilename);
exit(ERR_FILEPERM);
}
/*
* As it doesn't exist yet, verify that we can create it.
*/
if (!accessible(pool, pwfilename, APR_CREATE | APR_WRITE)) {
apr_file_printf(errfile, "%s: cannot create file %s\n",
argv[0], pwfilename);
exit(ERR_FILEPERM);
}
}
}
/*
* All the file access checks (if any) have been made. Time to go to work;
* try to create the record for the username in question. If that
* fails, there's no need to waste any time on file manipulations.
* Any error message text is returned in the record buffer, since
* the mkrecord() routine doesn't have access to argv[].
*/
if (!(mask & APHTP_DELUSER)) {
i = mkrecord(user, record, sizeof(record) - 1,
password, alg);
if (i != 0) {
apr_file_printf(errfile, "%s: %s\n", argv[0], record);
exit(i);
}
if (mask & APHTP_NOFILE) {
printf("%s\n", record);
exit(0);
}
}
/*
* We can access the files the right way, and we have a record
* to add or update. Let's do it..
*/
if (apr_temp_dir_get((const char**)&dirname, pool) != APR_SUCCESS) {
apr_file_printf(errfile, "%s: could not determine temp dir\n",
argv[0]);
exit(ERR_FILEPERM);
}
dirname = apr_psprintf(pool, "%s/%s", dirname, tn);
if (apr_file_mktemp(&ftemp, dirname, 0, pool) != APR_SUCCESS) {
apr_file_printf(errfile, "%s: unable to create temporary file %s\n",
argv[0], dirname);
exit(ERR_FILEPERM);
}
/*
* If we're not creating a new file, copy records from the existing
* one to the temporary file until we find the specified user.
*/
if (existing_file && !(mask & APHTP_NEWFILE)) {
if (apr_file_open(&fpw, pwfilename, APR_READ | APR_BUFFERED,
APR_OS_DEFAULT, pool) != APR_SUCCESS) {
apr_file_printf(errfile, "%s: unable to read file %s\n",
argv[0], pwfilename);
exit(ERR_FILEPERM);
}
while (apr_file_gets(line, sizeof(line), fpw) == APR_SUCCESS) {
char *colon;
if ((line[0] == '#') || (line[0] == '\0')) {
putline(ftemp, line);
continue;
}
strcpy(scratch, line);
/*
* See if this is our user.
*/
colon = strchr(scratch, ':');
if (colon != NULL) {
*colon = '\0';
}
else {
/*
* If we've not got a colon on the line, this could well
* not be a valid htpasswd file.
* We should bail at this point.
*/
apr_file_printf(errfile, "\n%s: The file %s does not appear "
"to be a valid htpasswd file.\n",
argv[0], pwfilename);
apr_file_close(fpw);
exit(ERR_INVALID);
}
if (strcmp(user, scratch) != 0) {
putline(ftemp, line);
continue;
}
else {
if (!(mask & APHTP_DELUSER)) {
/* We found the user we were looking for.
* Add him to the file.
*/
apr_file_printf(errfile, "Updating ");
putline(ftemp, record);
found++;
}
else {
/* We found the user we were looking for.
* Delete them from the file.
*/
apr_file_printf(errfile, "Deleting ");
found++;
}
}
}
apr_file_close(fpw);
}
if (!found && !(mask & APHTP_DELUSER)) {
apr_file_printf(errfile, "Adding ");
putline(ftemp, record);
}
else if (!found && (mask & APHTP_DELUSER)) {
apr_file_printf(errfile, "User %s not found\n", user);
exit(0);
}
apr_file_printf(errfile, "password for user %s\n", user);
/* The temporary file has all the data, just copy it to the new location.
*/
if (apr_file_copy(dirname, pwfilename, APR_FILE_SOURCE_PERMS, pool) !=
APR_SUCCESS) {
apr_file_printf(errfile, "%s: unable to update file %s\n",
argv[0], pwfilename);
exit(ERR_FILEPERM);
}
apr_file_close(ftemp);
return 0;
}
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