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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
#include "passwd_common.h"
#include "apr_strings.h"
#include "apr_errno.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
apr_file_t *errfile;
static int generate_salt(char *s, size_t size, const char **errstr,
apr_pool_t *pool)
{
unsigned char rnd[32];
static const char itoa64[] =
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
apr_size_t n;
unsigned int val = 0, bits = 0;
apr_status_t rv;
n = (size * 6 + 7)/8;
if (n > sizeof(rnd)) {
apr_file_printf(errfile, "generate_salt(): BUG: Buffer too small");
abort();
}
rv = apr_generate_random_bytes(rnd, n);
if (rv) {
*errstr = apr_psprintf(pool, "Unable to generate random bytes: %pm",
&rv);
return ERR_RANDOM;
}
n = 0;
while (size > 0) {
if (bits < 6) {
val |= (rnd[n++] << bits);
bits += 8;
}
*s++ = itoa64[val & 0x3f];
size--;
val >>= 6;
bits -= 6;
}
*s = '\0';
return 0;
}
void putline(apr_file_t *f, const char *l)
{
apr_status_t rv;
rv = apr_file_puts(l, f);
if (rv != APR_SUCCESS) {
apr_file_printf(errfile, "Error writing temp file: %pm", &rv);
apr_file_close(f);
exit(ERR_FILEPERM);
}
}
int get_password(struct passwd_ctx *ctx)
{
if (ctx->passwd_src == PW_STDIN) {
char *buf = ctx->out;
apr_file_t *file_stdin;
apr_size_t nread;
if (apr_file_open_stdin(&file_stdin, ctx->pool) != APR_SUCCESS) {
ctx->errstr = "Unable to read from stdin.";
return ERR_GENERAL;
}
if (apr_file_read_full(file_stdin, buf, ctx->out_len - 1,
&nread) != APR_EOF
|| nread == ctx->out_len - 1) {
goto err_too_long;
}
buf[nread] = '\0';
if (nread >= 1 && buf[nread-1] == '\n') {
buf[nread-1] = '\0';
if (nread >= 2 && buf[nread-2] == '\r')
buf[nread-2] = '\0';
}
apr_file_close(file_stdin);
}
else {
char buf[MAX_STRING_LEN + 1];
apr_size_t bufsize = sizeof(buf);
if (apr_password_get("New password: ", ctx->out, &ctx->out_len) != 0)
goto err_too_long;
apr_password_get("Re-type new password: ", buf, &bufsize);
if (strcmp(ctx->out, buf) != 0) {
ctx->errstr = "password verification error";
memset(ctx->out, '\0', ctx->out_len);
memset(buf, '\0', sizeof(buf));
return ERR_PWMISMATCH;
}
memset(buf, '\0', sizeof(buf));
}
return 0;
err_too_long:
ctx->errstr = apr_psprintf(ctx->pool,
"password too long (>%" APR_SIZE_T_FMT ")",
ctx->out_len - 1);
return ERR_OVERFLOW;
}
/*
* Make a password record from the given information. A zero return
* indicates success; on failure, ctx->errstr points to the error message.
*/
int mkhash(struct passwd_ctx *ctx)
{
char *pw;
char pwin[MAX_STRING_LEN];
char salt[16];
apr_status_t rv;
int ret = 0;
#if CRYPT_ALGO_SUPPORTED
char *cbuf;
#endif
if (ctx->cost != 0 && ctx->alg != ALG_BCRYPT) {
apr_file_printf(errfile,
"Warning: Ignoring -C argument for this algorithm." NL);
}
if (ctx->passwd != NULL) {
pw = ctx->passwd;
}
else {
if ((ret = get_password(ctx)) != 0)
return ret;
pw = pwin;
}
switch (ctx->alg) {
case ALG_APSHA:
/* XXX out >= 28 + strlen(sha1) chars - fixed len SHA */
apr_sha1_base64(pw, strlen(pw), ctx->out);
break;
case ALG_APMD5:
ret = generate_salt(salt, 8, &ctx->errstr, ctx->pool);
if (ret != 0)
break;
rv = apr_md5_encode(pw, salt, ctx->out, ctx->out_len);
if (rv != APR_SUCCESS) {
ctx->errstr = apr_psprintf(ctx->pool,
"could not encode password: %pm", &rv);
ret = ERR_GENERAL;
}
break;
case ALG_PLAIN:
/* XXX this len limitation is not in sync with any HTTPd len. */
apr_cpystrn(ctx->out, pw, ctx->out_len);
break;
#if CRYPT_ALGO_SUPPORTED
case ALG_CRYPT:
ret = generate_salt(salt, 8, &ctx->errstr, ctx->pool);
if (ret != 0)
break;
cbuf = crypt(pw, salt);
if (cbuf == NULL) {
rv = APR_FROM_OS_ERROR(errno);
ctx->errstr = apr_psprintf(ctx->pool, "crypt() failed: %pm", &rv);
ret = ERR_PWMISMATCH;
break;
}
apr_cpystrn(ctx->out, cbuf, ctx->out_len - 1);
if (strlen(pw) > 8) {
char *truncpw = strdup(pw);
truncpw[8] = '\0';
if (!strcmp(ctx->out, crypt(truncpw, salt))) {
apr_file_printf(errfile, "Warning: Password truncated to 8 "
"characters by CRYPT algorithm." NL);
}
memset(truncpw, '\0', strlen(pw));
free(truncpw);
}
break;
#endif /* CRYPT_ALGO_SUPPORTED */
#if BCRYPT_ALGO_SUPPORTED
case ALG_BCRYPT:
rv = apr_generate_random_bytes((unsigned char*)salt, 16);
if (rv != APR_SUCCESS) {
ctx->errstr = apr_psprintf(ctx->pool, "Unable to generate random "
"bytes: %pm", &rv);
ret = ERR_RANDOM;
break;
}
if (ctx->cost == 0)
ctx->cost = BCRYPT_DEFAULT_COST;
rv = apr_bcrypt_encode(pw, ctx->cost, (unsigned char*)salt, 16,
ctx->out, ctx->out_len);
if (rv != APR_SUCCESS) {
ctx->errstr = apr_psprintf(ctx->pool, "Unable to encode with "
"bcrypt: %pm", &rv);
ret = ERR_PWMISMATCH;
break;
}
break;
#endif /* BCRYPT_ALGO_SUPPORTED */
default:
apr_file_printf(errfile, "mkhash(): BUG: invalid algorithm %d",
ctx->alg);
abort();
}
memset(pw, '\0', strlen(pw));
return ret;
}
int parse_common_options(struct passwd_ctx *ctx, char opt,
const char *opt_arg)
{
switch (opt) {
case 'b':
ctx->passwd_src = PW_ARG;
break;
case 'i':
ctx->passwd_src = PW_STDIN;
break;
case 'm':
ctx->alg = ALG_APMD5;
break;
case 's':
ctx->alg = ALG_APSHA;
break;
case 'p':
ctx->alg = ALG_PLAIN;
#if !PLAIN_ALGO_SUPPORTED
/* Backward compatible behavior: Just print a warning */
apr_file_printf(errfile,
"Warning: storing passwords as plain text might just "
"not work on this platform." NL);
#endif
break;
case 'd':
#if CRYPT_ALGO_SUPPORTED
ctx->alg = ALG_CRYPT;
#else
/* Backward compatible behavior: Use MD5. OK since MD5 is more secure */
apr_file_printf(errfile,
"Warning: CRYPT algorithm not supported on this "
"platform." NL
"Automatically using MD5 format." NL);
ctx->alg = ALG_APMD5;
#endif
break;
case 'B':
#if BCRYPT_ALGO_SUPPORTED
ctx->alg = ALG_BCRYPT;
#else
/* Don't fall back to something less secure */
ctx->errstr = "BCRYPT algorithm not supported on this platform";
return ERR_ALG_NOT_SUPP;
#endif
break;
case 'C': {
char *endptr;
long num = strtol(opt_arg, &endptr, 10);
if (*endptr != '\0' || num <= 0) {
ctx->errstr = "argument to -C must be a positive integer";
return ERR_SYNTAX;
}
ctx->cost = num;
break;
}
default:
apr_file_printf(errfile,
"parse_common_options(): BUG: invalid option %c",
opt);
abort();
}
return 0;
}
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