/* 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.

 */

/*

 * htdbm.c: simple program for manipulating DBM

 * password databases for the Apache HTTP server

 *

 * Contributed by Mladen Turk <mturk mappingsoft.com>

 * 12 Oct 2001

 */

#include "passwd_common.h"

#include "apr_file_io.h"

#include "apr_file_info.h"

#include "apr_pools.h"

#include "apr_signal.h"

#include "apr_md5.h"

#include "apr_sha1.h"

#include "apr_dbm.h"

#include "apr_getopt.h"

#if APR_HAVE_STDLIB_H

#include <stdlib.h>

#endif

#if APR_HAVE_STRING_H

#include <string.h>

#endif

#if APR_HAVE_STRINGS_H

#include <strings.h>

#endif

#include <time.h>

#if APR_CHARSET_EBCDIC

#include "apr_xlate.h"

#endif /*APR_CHARSET_EBCDIC*/

#if APR_HAVE_UNISTD_H

#include <unistd.h>

#endif

#if APR_HAVE_CRYPT_H

#include <crypt.h>

#endif

typedef struct htdbm_t htdbm_t;

struct htdbm_t {

    apr_dbm_t               *dbm;

    struct passwd_ctx       ctx;

#if APR_CHARSET_EBCDIC

    apr_xlate_t             *to_ascii;

#endif

    char                    *filename;

    char                    *username;

    char                    *comment;

    char                    *type;

    int                     create;

    int                     rdonly;

};

#define HTDBM_MAKE   0

#define HTDBM_DELETE 1

#define HTDBM_VERIFY 2

#define HTDBM_LIST   3

#define HTDBM_NOFILE 4

static void terminate(void)

{

    apr_terminate();

#ifdef NETWARE

    pressanykey();

#endif

}

static void htdbm_terminate(htdbm_t *htdbm)

{

    if (htdbm->dbm)

        apr_dbm_close(htdbm->dbm);

    htdbm->dbm = NULL;

}

static htdbm_t *h;

static void htdbm_interrupted(void)

{

    htdbm_terminate(h);

    fprintf(stderr, "htdbm Interrupted !\n");

    exit(ERR_INTERRUPTED);

}

static apr_status_t htdbm_init(apr_pool_t **pool, htdbm_t **hdbm)

{

#if APR_CHARSET_EBCDIC

    apr_status_t rv;

#endif

    apr_pool_create( pool, NULL);

    apr_pool_abort_set(abort_on_oom, *pool);

    apr_file_open_stderr(&errfile, *pool);

    apr_signal(SIGINT, (void (*)(int)) htdbm_interrupted);

    (*hdbm) = (htdbm_t *)apr_pcalloc(*pool, sizeof(htdbm_t));

    (*hdbm)->ctx.pool = *pool;

#if APR_CHARSET_EBCDIC

    rv = apr_xlate_open(&((*hdbm)->to_ascii), "ISO-8859-1", APR_DEFAULT_CHARSET, (*hdbm)->ctx.pool);

    if (rv) {

        fprintf(stderr, "apr_xlate_open(to ASCII)->%d\n", rv);

        return APR_EGENERAL;

    }

    rv = apr_SHA1InitEBCDIC((*hdbm)->to_ascii);

    if (rv) {

        fprintf(stderr, "apr_SHA1InitEBCDIC()->%d\n", rv);

        return APR_EGENERAL;

    }

    rv = apr_MD5InitEBCDIC((*hdbm)->to_ascii);

    if (rv) {

        fprintf(stderr, "apr_MD5InitEBCDIC()->%d\n", rv);

        return APR_EGENERAL;

    }

#endif /*APR_CHARSET_EBCDIC*/

    /* Set MD5 as default */

    (*hdbm)->ctx.alg = ALG_APMD5;

    (*hdbm)->type = "default";

    return APR_SUCCESS;

}

static apr_status_t htdbm_open(htdbm_t *htdbm)

{

    if (htdbm->create)

        return apr_dbm_open_ex(&htdbm->dbm, htdbm->type, htdbm->filename, APR_DBM_RWCREATE,

                            APR_OS_DEFAULT, htdbm->ctx.pool);

    else

        return apr_dbm_open_ex(&htdbm->dbm, htdbm->type, htdbm->filename,

                            htdbm->rdonly ? APR_DBM_READONLY : APR_DBM_READWRITE,

                            APR_OS_DEFAULT, htdbm->ctx.pool);

}

static apr_status_t htdbm_save(htdbm_t *htdbm, int *changed)

{

    apr_datum_t key, val;

    if (!htdbm->username)

        return APR_SUCCESS;

    key.dptr = htdbm->username;

    key.dsize = strlen(htdbm->username);

    if (apr_dbm_exists(htdbm->dbm, key))

        *changed = 1;

    val.dsize = strlen(htdbm->ctx.passwd);

    if (!htdbm->comment)

        val.dptr  = htdbm->ctx.passwd;

    else {

        val.dptr = apr_pstrcat(htdbm->ctx.pool, htdbm->ctx.passwd, ":",

                               htdbm->comment, NULL);

        val.dsize += (strlen(htdbm->comment) + 1);

    }

    return apr_dbm_store(htdbm->dbm, key, val);

}

static apr_status_t htdbm_del(htdbm_t *htdbm)

{

    apr_datum_t key;

    key.dptr = htdbm->username;

    key.dsize = strlen(htdbm->username);

    if (!apr_dbm_exists(htdbm->dbm, key))

        return APR_ENOENT;

    return apr_dbm_delete(htdbm->dbm, key);

}

static apr_status_t htdbm_verify(htdbm_t *htdbm)

{

    apr_datum_t key, val;

    char *pwd;

    char *rec, *cmnt;

    key.dptr = htdbm->username;

    key.dsize = strlen(htdbm->username);

    if (!apr_dbm_exists(htdbm->dbm, key))

        return APR_ENOENT;

    if (apr_dbm_fetch(htdbm->dbm, key, &val) != APR_SUCCESS)

        return APR_ENOENT;

    rec = apr_pstrndup(htdbm->ctx.pool, val.dptr, val.dsize);

    cmnt = strchr(rec, ':');

    if (cmnt)

        pwd = apr_pstrndup(htdbm->ctx.pool, rec, cmnt - rec);

    else

        pwd = apr_pstrdup(htdbm->ctx.pool, rec);

    return apr_password_validate(htdbm->ctx.passwd, pwd);

}

static apr_status_t htdbm_list(htdbm_t *htdbm)

{

    apr_status_t rv;

    apr_datum_t key, val;

    char *cmnt;

    int i = 0;

    rv = apr_dbm_firstkey(htdbm->dbm, &key);

    if (rv != APR_SUCCESS) {

        fprintf(stderr, "Empty database -- %s\n", htdbm->filename);

        return APR_ENOENT;

    }

    fprintf(stderr, "Dumping records from database -- %s\n", htdbm->filename);

    fprintf(stderr, "    %-32s Comment\n", "Username");

    while (key.dptr != NULL) {

        rv = apr_dbm_fetch(htdbm->dbm, key, &val;;

        if (rv != APR_SUCCESS) {

            fprintf(stderr, "Failed getting data from %s\n", htdbm->filename);

            return APR_EGENERAL;

        }

        /* Note: we don't store \0-terminators on our dbm data */

        fprintf(stderr, "    %-32.*s", (int)key.dsize, key.dptr);

        cmnt = memchr(val.dptr, ':', val.dsize);

        if (cmnt)

            fprintf(stderr, " %.*s", (int)(val.dptr+val.dsize - (cmnt+1)), cmnt + 1);

        fprintf(stderr, "\n");

        rv = apr_dbm_nextkey(htdbm->dbm, &key);

        if (rv != APR_SUCCESS)

            fprintf(stderr, "Failed getting NextKey\n");

        ++i;

    }

    fprintf(stderr, "Total #records : %d\n", i);

    return APR_SUCCESS;

}

static int htdbm_make(htdbm_t *htdbm)

{

    char cpw[MAX_STRING_LEN];

    int ret;

    htdbm->ctx.out = cpw;

    htdbm->ctx.out_len = sizeof(cpw);

    ret = mkhash(&htdbm->ctx);

    if (ret != 0) {

        fprintf(stderr, "Error: %s\n", htdbm->ctx.errstr);

        return ret;

    }

    htdbm->ctx.passwd = apr_pstrdup(htdbm->ctx.pool, cpw);

    return 0;

}

static apr_status_t htdbm_valid_username(htdbm_t *htdbm)

{

    if (!htdbm->username || (strlen(htdbm->username) > 64) || (strlen(htdbm->username) < 1)) {

        fprintf(stderr, "Invalid username length\n");

        return APR_EINVAL;

    }

    if (strchr(htdbm->username, ':')) {

        fprintf(stderr, "Username contains invalid characters\n");

        return APR_EINVAL;

    }

    return APR_SUCCESS;

}

static void htdbm_usage(void)

{

    fprintf(stderr,

        "htdbm -- program for manipulating DBM password databases.\n\n"

        "Usage: htdbm   [-cimBdpstvx] [-C cost] [-TDBTYPE] database username\n"

        "                -b[cmBdptsv] [-C cost] [-TDBTYPE] database username password\n"

        "                -n[imBdpst]  [-C cost] username\n"

        "                -nb[mBdpst]  [-C cost] username password\n"

        "                -v[imBdps]   [-C cost] [-TDBTYPE] database username\n"

        "                -vb[mBdps]   [-C cost] [-TDBTYPE] database username password\n"

        "                -x                     [-TDBTYPE] database username\n"

        "                -l                     [-TDBTYPE] database\n"

        "Options:\n"

        "   -c   Create a new database.\n"

        "   -n   Don't update database; display results on stdout.\n"

        "   -b   Use the password from the command line rather than prompting for it.\n"

        "   -i   Read password from stdin without verification (for script usage).\n"

        "   -m   Force MD5 encryption of the password (default).\n"

        "   -B   Force BCRYPT encryption of the password (very secure).\n"

        "   -C   Set the computing time used for the bcrypt algorithm\n"

        "        (higher is more secure but slower, default: %d, valid: 4 to 31).\n"

        "   -d   Force CRYPT encryption of the password (8 chars max, insecure).\n"

        "   -s   Force SHA encryption of the password (insecure).\n"

        "   -p   Do not encrypt the password (plaintext, insecure).\n"

        "   -T   DBM Type (SDBM|GDBM|DB|default).\n"

        "   -l   Display usernames from database on stdout.\n"

        "   -v   Verify the username/password.\n"

        "   -x   Remove the username record from database.\n"

        "   -t   The last param is username comment.\n"

        "The SHA algorithm does not use a salt and is less secure than the "

        "MD5 algorithm.\n",

        BCRYPT_DEFAULT_COST);

    exit(ERR_SYNTAX);

}

int main(int argc, const char * const argv[])

{

    apr_pool_t *pool;

    apr_status_t rv;

    char errbuf[MAX_STRING_LEN];

    int  need_file = 1;

    int  need_user = 1;

    int  need_pwd  = 1;

    int  need_cmnt = 0;

    int  changed = 0;

    int  cmd = HTDBM_MAKE;

    int  i, ret, args_left = 2;

    apr_getopt_t *state;

    char opt;

    const char *opt_arg;

    apr_app_initialize(&argc, &argv, NULL);

    atexit(terminate);

    if ((rv = htdbm_init(&pool, &h)) != APR_SUCCESS) {

        fprintf(stderr, "Unable to initialize htdbm terminating!\n");

        apr_strerror(rv, errbuf, sizeof(errbuf));

        exit(1);

    }

    rv = apr_getopt_init(&state, pool, argc, argv);

    if (rv != APR_SUCCESS)

        exit(ERR_SYNTAX);

    while ((rv = apr_getopt(state, "cnmspdBbtivxlC:T:", &opt, &opt_arg)) == APR_SUCCESS) {

        switch (opt) {

        case 'c':

            h->create = 1;

            break;

        case 'n':

            need_file = 0;

            cmd = HTDBM_NOFILE;

            args_left--;

            break;

        case 'l':

            need_pwd = 0;

            need_user = 0;

            cmd = HTDBM_LIST;

            h->rdonly = 1;

            args_left--;

            break;

        case 't':

            need_cmnt = 1;

            args_left++;

            break;

        case 'T':

            h->type = apr_pstrdup(h->ctx.pool, opt_arg);

            break;

        case 'v':

            h->rdonly = 1;

            cmd = HTDBM_VERIFY;

            break;

        case 'x':

            need_pwd = 0;

            cmd = HTDBM_DELETE;

            break;

        default:

            ret = parse_common_options(&h->ctx, opt, opt_arg);

            if (ret) {

                fprintf(stderr, "Error: %s\n", h->ctx.errstr);

                exit(ret);

            }

        }

    }

    if (h->ctx.passwd_src == PW_ARG) {

            need_pwd = 0;

            args_left++;

    }

    /*

     * Make sure we still have exactly the right number of arguments left

     * (the filename, the username, and possibly the password if -b was

     * specified).

     */

    i = state->ind;

    if (rv != APR_EOF || argc - i != args_left)

        htdbm_usage();

    if (need_file) {

        h->filename = apr_pstrdup(h->ctx.pool, argv[i++]);

        if ((rv = htdbm_open(h)) != APR_SUCCESS) {

            fprintf(stderr, "Error opening database %s\n", h->filename);

            apr_strerror(rv, errbuf, sizeof(errbuf));

            fprintf(stderr,"%s\n",errbuf);

            exit(ERR_FILEPERM);

        }

    }

    if (need_user) {

        h->username = apr_pstrdup(pool, argv[i++]);

        if (htdbm_valid_username(h) != APR_SUCCESS)

            exit(ERR_BADUSER);

    }

    if (h->ctx.passwd_src == PW_ARG)

        h->ctx.passwd = apr_pstrdup(pool, argv[i++]);

    if (need_pwd) {

        ret = get_password(&h->ctx);

        if (ret) {

            fprintf(stderr, "Error: %s\n", h->ctx.errstr);

            exit(ret);

        }

    }

    if (need_cmnt)

        h->comment = apr_pstrdup(pool, argv[i++]);

    switch (cmd) {

        case HTDBM_VERIFY:

            if ((rv = htdbm_verify(h)) != APR_SUCCESS) {

                if (APR_STATUS_IS_ENOENT(rv)) {

                    fprintf(stderr, "The user '%s' could not be found in database\n", h->username);

                    exit(ERR_BADUSER);

                }

                else {

                    fprintf(stderr, "Password mismatch for user '%s'\n", h->username);

                    exit(ERR_PWMISMATCH);

                }

            }

            else

                fprintf(stderr, "Password validated for user '%s'\n", h->username);

            break;

        case HTDBM_DELETE:

            if (htdbm_del(h) != APR_SUCCESS) {

                fprintf(stderr, "Cannot find user '%s' in database\n", h->username);

                exit(ERR_BADUSER);

            }

            h->username = NULL;

            changed = 1;

            break;

        case HTDBM_LIST:

            htdbm_list(h);

            break;

        default:

            ret = htdbm_make(h);

            if (ret)

                exit(ret);

            break;

    }

    if (need_file && !h->rdonly) {

        if ((rv = htdbm_save(h, &changed)) != APR_SUCCESS) {

            apr_strerror(rv, errbuf, sizeof(errbuf));

            exit(ERR_FILEPERM);

        }

        fprintf(stdout, "Database %s %s.\n", h->filename,

                h->create ? "created" : (changed ? "modified" : "updated"));

    }

    if (cmd == HTDBM_NOFILE) {

        if (!need_cmnt) {

            fprintf(stderr, "%s:%s\n", h->username, h->ctx.passwd);

        }

        else {

            fprintf(stderr, "%s:%s:%s\n", h->username, h->ctx.passwd,

                    h->comment);

        }

    }

    htdbm_terminate(h);

    return 0; /* Suppress compiler warning. */

}