Roland C. Dowdeswell
e3a59b65d3
Generate 12 random bytes and encode them with Heimdal base64url, producing 16-character random passwords with 96 bits of entropy. This avoids punctuation and quoting issues while still raising generated password entropy substantially from the old roughly 55-bit generator. Fixes #1145
62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/*
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* Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kadmin_locl.h"
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#include <base64.h>
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#define RANDOM_PASSWORD_BYTES 12
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void
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random_password(char *pw, size_t len)
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{
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unsigned char random[RANDOM_PASSWORD_BYTES];
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char *password = NULL;
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size_t password_len;
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if (len == 0)
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return;
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krb5_generate_random_block(random, sizeof(random));
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if (rk_base64url_encode(random, sizeof(random), &password) < 0 ||
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password == NULL) {
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memset_s(random, sizeof(random), 0, sizeof(random));
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krb5_abortx(NULL, "Failed to encode random password");
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}
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password_len = strlen(password);
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strlcpy(pw, password, len);
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memset_s(random, sizeof(random), 0, sizeof(random));
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memset_s(password, password_len, 0, password_len);
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free(password);
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}
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