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-rw-r--r--contrib/slapd-modules/passwd/apr1.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/contrib/slapd-modules/passwd/apr1.c b/contrib/slapd-modules/passwd/apr1.c
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+++ b/contrib/slapd-modules/passwd/apr1.c
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+/* $OpenLDAP$ */
+/*
+ * This file is derived from OpenLDAP Software. All of the modifications to
+ * OpenLDAP Software represented in the following file were developed by
+ * Devin J. Pohly <djpohly@gmail.com>. I have not assigned rights and/or
+ * interest in this work to any party.
+ *
+ * The extensions to OpenLDAP Software herein are subject to the following
+ * notice:
+ *
+ * Copyright 2011 Devin J. Pohly
+ * Portions Copyright 2011 Howard Chu
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP Public
+ * License.
+ *
+ * A portion of this code is used in accordance with the Beer-ware License,
+ * revision 42, as noted.
+ *
+ */
+#include <lber.h>
+#include <lber_pvt.h>
+#include "lutil.h"
+#include "lutil_md5.h"
+#include <ac/string.h>
+
+#include <assert.h>
+
+/* the only difference between this and straight PHK is the magic */
+static LUTIL_PASSWD_CHK_FUNC chk_apr1;
+static LUTIL_PASSWD_HASH_FUNC hash_apr1;
+static const struct berval scheme_apr1 = BER_BVC("{APR1}");
+static const struct berval magic_apr1 = BER_BVC("$apr1$");
+
+static LUTIL_PASSWD_CHK_FUNC chk_bsdmd5;
+static LUTIL_PASSWD_HASH_FUNC hash_bsdmd5;
+static const struct berval scheme_bsdmd5 = BER_BVC("{BSDMD5}");
+static const struct berval magic_bsdmd5 = BER_BVC("$1$");
+
+static const unsigned char apr64[] =
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+#define APR_SALT_SIZE 8
+
+/* The algorithm implemented in this function was created by Poul-Henning
+ * Kamp and released under the following license:
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ */
+static void do_phk_hash(
+ const struct berval *passwd,
+ const struct berval *salt,
+ const struct berval *magic,
+ unsigned char *digest)
+{
+ lutil_MD5_CTX ctx, ctx1;
+ int n;
+
+ /* Start hashing */
+ lutil_MD5Init(&ctx);
+ lutil_MD5Update(&ctx, (const unsigned char *) passwd->bv_val, passwd->bv_len);
+ lutil_MD5Update(&ctx, (const unsigned char *) magic->bv_val, magic->bv_len);
+ lutil_MD5Update(&ctx, (const unsigned char *) salt->bv_val, salt->bv_len);
+ /* Inner hash */
+ lutil_MD5Init(&ctx1);
+ lutil_MD5Update(&ctx1, (const unsigned char *) passwd->bv_val, passwd->bv_len);
+ lutil_MD5Update(&ctx1, (const unsigned char *) salt->bv_val, salt->bv_len);
+ lutil_MD5Update(&ctx1, (const unsigned char *) passwd->bv_val, passwd->bv_len);
+ lutil_MD5Final(digest, &ctx1);
+ /* Nom start mixing things up */
+ for (n = passwd->bv_len; n > 0; n -= LUTIL_MD5_BYTES)
+ lutil_MD5Update(&ctx, digest,
+ (n > LUTIL_MD5_BYTES ? LUTIL_MD5_BYTES : n));
+ memset(digest, 0, LUTIL_MD5_BYTES);
+ /* Curiouser and curiouser... */
+ for (n = passwd->bv_len; n; n >>= 1)
+ if (n & 1)
+ lutil_MD5Update(&ctx, digest, 1);
+ else
+ lutil_MD5Update(&ctx, (const unsigned char *) passwd->bv_val, 1);
+ lutil_MD5Final(digest, &ctx);
+ /*
+ * Repeatedly hash things into the final value. This was originally
+ * intended to slow the algorithm down.
+ */
+ for (n = 0; n < 1000; n++) {
+ lutil_MD5Init(&ctx1);
+ if (n & 1)
+ lutil_MD5Update(&ctx1,
+ (const unsigned char *) passwd->bv_val, passwd->bv_len);
+ else
+ lutil_MD5Update(&ctx1, digest, LUTIL_MD5_BYTES);
+
+ if (n % 3)
+ lutil_MD5Update(&ctx1,
+ (const unsigned char *) salt->bv_val, salt->bv_len);
+ if (n % 7)
+ lutil_MD5Update(&ctx1,
+ (const unsigned char *) passwd->bv_val, passwd->bv_len);
+
+ if (n & 1)
+ lutil_MD5Update(&ctx1, digest, LUTIL_MD5_BYTES);
+ else
+ lutil_MD5Update(&ctx1,
+ (const unsigned char *) passwd->bv_val, passwd->bv_len);
+ lutil_MD5Final(digest, &ctx1);
+ }
+}
+
+static int chk_phk(
+ const struct berval *magic,
+ const struct berval *passwd,
+ const struct berval *cred,
+ const char **text)
+{
+ unsigned char digest[LUTIL_MD5_BYTES];
+ unsigned char *orig_pass;
+ int rc;
+ struct berval salt;
+ size_t decode_len = LUTIL_BASE64_DECODE_LEN(passwd->bv_len);
+
+ /* safety check */
+ if (decode_len <= sizeof(digest))
+ return LUTIL_PASSWD_ERR;
+
+ /* base64 un-encode password hash */
+ orig_pass = (unsigned char *) ber_memalloc(decode_len + 1);
+
+ if (orig_pass == NULL)
+ return LUTIL_PASSWD_ERR;
+
+ rc = lutil_b64_pton(passwd->bv_val, orig_pass, decode_len);
+
+ if (rc <= (int) sizeof(digest)) {
+ ber_memfree(orig_pass);
+ return LUTIL_PASSWD_ERR;
+ }
+
+ salt.bv_val = (char *) &orig_pass[sizeof(digest)];
+ salt.bv_len = rc - sizeof(digest);
+
+ do_phk_hash(cred, &salt, magic, digest);
+
+ if (text)
+ *text = NULL;
+
+ /* compare */
+ rc = memcmp((char *) orig_pass, (char *) digest, sizeof(digest));
+ ber_memfree(orig_pass);
+ return rc ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
+}
+
+static int chk_apr1(
+ const struct berval *scheme,
+ const struct berval *passwd,
+ const struct berval *cred,
+ const char **text)
+{
+ return chk_phk(&magic_apr1, passwd, cred, text);
+}
+
+static int chk_bsdmd5(
+ const struct berval *scheme,
+ const struct berval *passwd,
+ const struct berval *cred,
+ const char **text)
+{
+ return chk_phk(&magic_bsdmd5, passwd, cred, text);
+}
+
+static int hash_phk(
+ const struct berval *scheme,
+ const struct berval *magic,
+ const struct berval *passwd,
+ struct berval *hash,
+ const char **text)
+{
+ unsigned char digest_buf[LUTIL_MD5_BYTES];
+ char salt_buf[APR_SALT_SIZE];
+ struct berval digest;
+ struct berval salt;
+ int n;
+
+ digest.bv_val = (char *) digest_buf;
+ digest.bv_len = sizeof(digest_buf);
+ salt.bv_val = salt_buf;
+ salt.bv_len = APR_SALT_SIZE;
+
+ /* generate random salt */
+ if (lutil_entropy( (unsigned char *) salt.bv_val, salt.bv_len) < 0)
+ return LUTIL_PASSWD_ERR;
+ /* limit it to characters in the 64-char set */
+ for (n = 0; n < salt.bv_len; n++)
+ salt.bv_val[n] = apr64[salt.bv_val[n] % (sizeof(apr64) - 1)];
+
+ do_phk_hash(passwd, &salt, magic, digest_buf);
+
+ if (text)
+ *text = NULL;
+
+ return lutil_passwd_string64(scheme, &digest, hash, &salt);
+}
+
+static int hash_apr1(
+ const struct berval *scheme,
+ const struct berval *passwd,
+ struct berval *hash,
+ const char **text)
+{
+ return hash_phk(scheme, &magic_apr1, passwd, hash, text);
+}
+
+static int hash_bsdmd5(
+ const struct berval *scheme,
+ const struct berval *passwd,
+ struct berval *hash,
+ const char **text)
+{
+ return hash_phk(scheme, &magic_bsdmd5, passwd, hash, text);
+}
+
+int init_module(int argc, char *argv[]) {
+ int rc;
+ rc = lutil_passwd_add((struct berval *) &scheme_apr1, chk_apr1, hash_apr1);
+ if ( !rc )
+ rc = lutil_passwd_add((struct berval *) &scheme_bsdmd5,
+ chk_bsdmd5, hash_bsdmd5);
+ return rc;
+}