passwd.c

Go to the documentation of this file.

/* apps/passwd.c */

#if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
# define NO_MD5CRYPT_1
#endif

#if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)

#include <assert.h>
#include <string.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_DES
# include <openssl/des.h>
#endif
#ifndef NO_MD5CRYPT_1
# include <openssl/md5.h>
#endif


#undef PROG
#define PROG passwd_main


static unsigned const char cov_2char[64]={
        /* from crypto/des/fcrypt.c */
        0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
        0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
        0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
        0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
        0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
        0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
        0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
        0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
};

static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
        char *passwd, BIO *out, int quiet, int table, int reverse,
        size_t pw_maxlen, int usecrypt, int use1, int useapr1);

/* -crypt        - standard Unix password algorithm (default)
 * -1            - MD5-based password algorithm
 * -apr1         - MD5-based password algorithm, Apache variant
 * -salt string  - salt
 * -in file      - read passwords from file
 * -stdin        - read passwords from stdin
 * -noverify     - never verify when reading password from terminal
 * -quiet        - no warnings
 * -table        - format output as table
 * -reverse      - switch table columns
 */

int MAIN(int, char **);

int MAIN(int argc, char **argv)
        {
        int ret = 1;
        char *infile = NULL;
        int in_stdin = 0;
        int in_noverify = 0;
        char *salt = NULL, *passwd = NULL, **passwds = NULL;
        char *salt_malloc = NULL, *passwd_malloc = NULL;
        size_t passwd_malloc_size = 0;
        int pw_source_defined = 0;
        BIO *in = NULL, *out = NULL;
        int i, badopt, opt_done;
        int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
        int usecrypt = 0, use1 = 0, useapr1 = 0;
        size_t pw_maxlen = 0;

        apps_startup();

        if (bio_err == NULL)
                if ((bio_err=BIO_new(BIO_s_file())) != NULL)
                        BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

        if (!load_config(bio_err, NULL))
                goto err;
        out = BIO_new(BIO_s_file());
        if (out == NULL)
                goto err;
        BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
#ifdef OPENSSL_SYS_VMS
        {
        BIO *tmpbio = BIO_new(BIO_f_linebuffer());
        out = BIO_push(tmpbio, out);
        }
#endif

        badopt = 0, opt_done = 0;
        i = 0;
        while (!badopt && !opt_done && argv[++i] != NULL)
                {
                if (strcmp(argv[i], "-crypt") == 0)
                        usecrypt = 1;
                else if (strcmp(argv[i], "-1") == 0)
                        use1 = 1;
                else if (strcmp(argv[i], "-apr1") == 0)
                        useapr1 = 1;
                else if (strcmp(argv[i], "-salt") == 0)
                        {
                        if ((argv[i+1] != NULL) && (salt == NULL))
                                {
                                passed_salt = 1;
                                salt = argv[++i];
                                }
                        else
                                badopt = 1;
                        }
                else if (strcmp(argv[i], "-in") == 0)
                        {
                        if ((argv[i+1] != NULL) && !pw_source_defined)
                                {
                                pw_source_defined = 1;
                                infile = argv[++i];
                                }
                        else
                                badopt = 1;
                        }
                else if (strcmp(argv[i], "-stdin") == 0)
                        {
                        if (!pw_source_defined)
                                {
                                pw_source_defined = 1;
                                in_stdin = 1;
                                }
                        else
                                badopt = 1;
                        }
                else if (strcmp(argv[i], "-noverify") == 0)
                        in_noverify = 1;
                else if (strcmp(argv[i], "-quiet") == 0)
                        quiet = 1;
                else if (strcmp(argv[i], "-table") == 0)
                        table = 1;
                else if (strcmp(argv[i], "-reverse") == 0)
                        reverse = 1;
                else if (argv[i][0] == '-')
                        badopt = 1;
                else if (!pw_source_defined)
                        /* non-option arguments, use as passwords */
                        {
                        pw_source_defined = 1;
                        passwds = &argv[i];
                        opt_done = 1;
                        }
                else
                        badopt = 1;
                }

        if (!usecrypt && !use1 && !useapr1) /* use default */
                usecrypt = 1;
        if (usecrypt + use1 + useapr1 > 1) /* conflict */
                badopt = 1;

        /* reject unsupported algorithms */
#ifdef OPENSSL_NO_DES
        if (usecrypt) badopt = 1;
#endif
#ifdef NO_MD5CRYPT_1
        if (use1 || useapr1) badopt = 1;
#endif

        if (badopt) 
                {
                BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
                BIO_printf(bio_err, "where options are\n");
#ifndef OPENSSL_NO_DES
                BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
#endif
#ifndef NO_MD5CRYPT_1
                BIO_printf(bio_err, "-1                 MD5-based password algorithm\n");
                BIO_printf(bio_err, "-apr1              MD5-based password algorithm, Apache variant\n");
#endif
                BIO_printf(bio_err, "-salt string       use provided salt\n");
                BIO_printf(bio_err, "-in file           read passwords from file\n");
                BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
                BIO_printf(bio_err, "-noverify          never verify when reading password from terminal\n");
                BIO_printf(bio_err, "-quiet             no warnings\n");
                BIO_printf(bio_err, "-table             format output as table\n");
                BIO_printf(bio_err, "-reverse           switch table columns\n");
                
                goto err;
                }

        if ((infile != NULL) || in_stdin)
                {
                in = BIO_new(BIO_s_file());
                if (in == NULL)
                        goto err;
                if (infile != NULL)
                        {
                        assert(in_stdin == 0);
                        if (BIO_read_filename(in, infile) <= 0)
                                goto err;
                        }
                else
                        {
                        assert(in_stdin);
                        BIO_set_fp(in, stdin, BIO_NOCLOSE);
                        }
                }
        
        if (usecrypt)
                pw_maxlen = 8;
        else if (use1 || useapr1)
                pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */

        if (passwds == NULL)
                {
                /* no passwords on the command line */

                passwd_malloc_size = pw_maxlen + 2;
                /* longer than necessary so that we can warn about truncation */
                passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
                if (passwd_malloc == NULL)
                        goto err;
                }

        if ((in == NULL) && (passwds == NULL))
                {
                /* build a null-terminated list */
                static char *passwds_static[2] = {NULL, NULL};
                
                passwds = passwds_static;
                if (in == NULL)
                        if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", !(passed_salt || in_noverify)) != 0)
                                goto err;
                passwds[0] = passwd_malloc;
                }

        if (in == NULL)
                {
                assert(passwds != NULL);
                assert(*passwds != NULL);
                
                do /* loop over list of passwords */
                        {
                        passwd = *passwds++;
                        if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
                                quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
                                goto err;
                        }
                while (*passwds != NULL);
                }
        else
                /* in != NULL */
                {
                int done;

                assert (passwd != NULL);
                do
                        {
                        int r = BIO_gets(in, passwd, pw_maxlen + 1);
                        if (r > 0)
                                {
                                char *c = (strchr(passwd, '\n')) ;
                                if (c != NULL)
                                        *c = 0; /* truncate at newline */
                                else
                                        {
                                        /* ignore rest of line */
                                        char trash[BUFSIZ];
                                        do
                                                r = BIO_gets(in, trash, sizeof trash);
                                        while ((r > 0) && (!strchr(trash, '\n')));
                                        }
                                
                                if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
                                        quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
                                        goto err;
                                }
                        done = (r <= 0);
                        }
                while (!done);
                }
        ret = 0;

err:
        ERR_print_errors(bio_err);
        if (salt_malloc)
                OPENSSL_free(salt_malloc);
        if (passwd_malloc)
                OPENSSL_free(passwd_malloc);
        if (in)
                BIO_free(in);
        if (out)
                BIO_free_all(out);
        apps_shutdown();
        OPENSSL_EXIT(ret);
        }


#ifndef NO_MD5CRYPT_1
/* MD5-based password algorithm (should probably be available as a library
 * function; then the static buffer would not be acceptable).
 * For magic string "1", this should be compatible to the MD5-based BSD
 * password algorithm.
 * For 'magic' string "apr1", this is compatible to the MD5-based Apache
 * password algorithm.
 * (Apparently, the Apache password algorithm is identical except that the
 * 'magic' string was changed -- the laziest application of the NIH principle
 * I've ever encountered.)
 */
static char *md5crypt(const char *passwd, const char *magic, const char *salt)
        {
        static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
        unsigned char buf[MD5_DIGEST_LENGTH];
        char *salt_out;
        int n;
        unsigned int i;
        EVP_MD_CTX md,md2;
        size_t passwd_len, salt_len;

        passwd_len = strlen(passwd);
        out_buf[0] = '$';
        out_buf[1] = 0;
        assert(strlen(magic) <= 4); /* "1" or "apr1" */
        strncat(out_buf, magic, 4);
        strncat(out_buf, "$", 1);
        strncat(out_buf, salt, 8);
        assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
        salt_out = out_buf + 2 + strlen(magic);
        salt_len = strlen(salt_out);
        assert(salt_len <= 8);
        
        EVP_MD_CTX_init(&md);
        EVP_DigestInit_ex(&md,EVP_md5(), NULL);
        EVP_DigestUpdate(&md, passwd, passwd_len);
        EVP_DigestUpdate(&md, "$", 1);
        EVP_DigestUpdate(&md, magic, strlen(magic));
        EVP_DigestUpdate(&md, "$", 1);
        EVP_DigestUpdate(&md, salt_out, salt_len);
        
        EVP_MD_CTX_init(&md2);
        EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
        EVP_DigestUpdate(&md2, passwd, passwd_len);
        EVP_DigestUpdate(&md2, salt_out, salt_len);
        EVP_DigestUpdate(&md2, passwd, passwd_len);
        EVP_DigestFinal_ex(&md2, buf, NULL);

        for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
                EVP_DigestUpdate(&md, buf, sizeof buf);
        EVP_DigestUpdate(&md, buf, i);
        
        n = passwd_len;
        while (n)
                {
                EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
                n >>= 1;
                }
        EVP_DigestFinal_ex(&md, buf, NULL);

        for (i = 0; i < 1000; i++)
                {
                EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
                EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *) passwd : buf,
                                       (i & 1) ? passwd_len : sizeof buf);
                if (i % 3)
                        EVP_DigestUpdate(&md2, salt_out, salt_len);
                if (i % 7)
                        EVP_DigestUpdate(&md2, passwd, passwd_len);
                EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *) passwd,
                                       (i & 1) ? sizeof buf : passwd_len);
                EVP_DigestFinal_ex(&md2, buf, NULL);
                }
        EVP_MD_CTX_cleanup(&md2);
        
         {
                /* transform buf into output string */
        
                unsigned char buf_perm[sizeof buf];
                int dest, source;
                char *output;

                /* silly output permutation */
                for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
                        buf_perm[dest] = buf[source];
                buf_perm[14] = buf[5];
                buf_perm[15] = buf[11];
#ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
                assert(16 == sizeof buf_perm);
#endif
                
                output = salt_out + salt_len;
                assert(output == out_buf + strlen(out_buf));
                
                *output++ = '$';

                for (i = 0; i < 15; i += 3)
                        {
                        *output++ = cov_2char[buf_perm[i+2] & 0x3f];
                        *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
                                                  (buf_perm[i+2] >> 6)];
                        *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
                                                  (buf_perm[i+1] >> 4)];
                        *output++ = cov_2char[buf_perm[i] >> 2];
                        }
                assert(i == 15);
                *output++ = cov_2char[buf_perm[i] & 0x3f];
                *output++ = cov_2char[buf_perm[i] >> 6];
                *output = 0;
                assert(strlen(out_buf) < sizeof(out_buf));
         }
        EVP_MD_CTX_cleanup(&md);

        return out_buf;
        }
#endif


static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
        char *passwd, BIO *out, int quiet, int table, int reverse,
        size_t pw_maxlen, int usecrypt, int use1, int useapr1)
        {
        char *hash = NULL;

        assert(salt_p != NULL);
        assert(salt_malloc_p != NULL);

        /* first make sure we have a salt */
        if (!passed_salt)
                {
#ifndef OPENSSL_NO_DES
                if (usecrypt)
                        {
                        if (*salt_malloc_p == NULL)
                                {
                                *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
                                if (*salt_malloc_p == NULL)
                                        goto err;
                                }
                        if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
                                goto err;
                        (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
                        (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
                        (*salt_p)[2] = 0;
#ifdef CHARSET_EBCDIC
                        ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
                                                            * back to ASCII */
#endif
                        }
#endif /* !OPENSSL_NO_DES */

#ifndef NO_MD5CRYPT_1
                if (use1 || useapr1)
                        {
                        int i;
                        
                        if (*salt_malloc_p == NULL)
                                {
                                *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
                                if (*salt_malloc_p == NULL)
                                        goto err;
                                }
                        if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
                                goto err;
                        
                        for (i = 0; i < 8; i++)
                                (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
                        (*salt_p)[8] = 0;
                        }
#endif /* !NO_MD5CRYPT_1 */
                }
        
        assert(*salt_p != NULL);
        
        /* truncate password if necessary */
        if ((strlen(passwd) > pw_maxlen))
                {
                if (!quiet)
                        /* XXX: really we should know how to print a size_t, not cast it */
                        BIO_printf(bio_err, "Warning: truncating password to %u characters\n", (unsigned)pw_maxlen);
                passwd[pw_maxlen] = 0;
                }
        assert(strlen(passwd) <= pw_maxlen);
        
        /* now compute password hash */
#ifndef OPENSSL_NO_DES
        if (usecrypt)
                hash = DES_crypt(passwd, *salt_p);
#endif
#ifndef NO_MD5CRYPT_1
        if (use1 || useapr1)
                hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
#endif
        assert(hash != NULL);

        if (table && !reverse)
                BIO_printf(out, "%s\t%s\n", passwd, hash);
        else if (table && reverse)
                BIO_printf(out, "%s\t%s\n", hash, passwd);
        else
                BIO_printf(out, "%s\n", hash);
        return 1;
        
err:
        return 0;
        }
#else

int MAIN(int argc, char **argv)
        {
        fputs("Program not available.\n", stderr)
        OPENSSL_EXIT(1);
        }
#endif

---

© sourcejam.com 2005-2008