Quelle lua_passwd.c Sprache: C

/* 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 "lua_passwd.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"

#if APR_HAVE_TIME_H
#include <time.h>
#endif
#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
#if APR_HAVE_IO_H
#include <io.h>
#endif

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)) {
        *errstr = apr_psprintf(pool, "generate_salt(): BUG: Buffer too small");
        return ERR_RANDOM;
    }
    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;
}

/*
* Make a password record from the given information.  A zero return
* indicates success; on failure, ctx->errstr points to the error message.
*/
int mk_password_hash(passwd_ctx *ctx)
{
    char *pw;
    char salt[16];
    apr_status_t rv;
    int ret = 0;
#if CRYPT_ALGO_SUPPORTED
    char *cbuf;
#endif

    pw = ctx->passwd;
    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) {
            ret = ERR_GENERAL;
            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;

#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 = apr_pstrdup(ctx->pool, pw);
            truncpw[8] = '\0';
            if (!strcmp(ctx->out, crypt(truncpw, salt))) {
                ctx->errstr = apr_psprintf(ctx->pool,
                                           "Warning: Password truncated to 8 "
                                           "characters by CRYPT algorithm.");
            }
            memset(truncpw, '\0', strlen(pw));
        }
        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:
        ctx->errstr = apr_psprintf(ctx->pool,
                                  "mk_password_hash(): unsupported algorithm %d",
                                  ctx->alg);
        ret = ERR_GENERAL;
    }
    memset(pw, '\0', strlen(pw));
    return ret;
}

quality97%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.