/* 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)
{
    /* "$apr1$..salt..$.......md5hash..........\0" */
    static char out_buf[6 + 9 + 24 + 2];
    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_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_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
