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a2b987e79f
Note: use of {SHA} passwords is discouraged as {SHA} password scheme is
vulnerable to attacks using rainbow tables. Use of {SSHA}, $apr1$ or
crypt() algorithms as supported by OS is recommended instead.
The {SHA} password scheme support is added to avoid the need of changing
the scheme recorded in password files from {SHA} to {SSHA} because such
a change hides security problem with {SHA} passwords.
Patch by Louis Opter, with minor changes.
284 lines
6.7 KiB
C
284 lines
6.7 KiB
C
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/*
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* Copyright (C) Maxim Dounin
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_crypt.h>
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#include <ngx_md5.h>
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#if (NGX_HAVE_SHA1)
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#include <ngx_sha1.h>
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#endif
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#if (NGX_CRYPT)
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static ngx_int_t ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt,
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u_char **encrypted);
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static ngx_int_t ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt,
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u_char **encrypted);
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#if (NGX_HAVE_SHA1)
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static ngx_int_t ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt,
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u_char **encrypted);
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static ngx_int_t ngx_crypt_sha(ngx_pool_t *pool, u_char *key, u_char *salt,
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u_char **encrypted);
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#endif
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static u_char *ngx_crypt_to64(u_char *p, uint32_t v, size_t n);
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ngx_int_t
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ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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{
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if (ngx_strncmp(salt, "$apr1$", sizeof("$apr1$") - 1) == 0) {
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return ngx_crypt_apr1(pool, key, salt, encrypted);
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} else if (ngx_strncmp(salt, "{PLAIN}", sizeof("{PLAIN}") - 1) == 0) {
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return ngx_crypt_plain(pool, key, salt, encrypted);
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#if (NGX_HAVE_SHA1)
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} else if (ngx_strncmp(salt, "{SSHA}", sizeof("{SSHA}") - 1) == 0) {
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return ngx_crypt_ssha(pool, key, salt, encrypted);
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} else if (ngx_strncmp(salt, "{SHA}", sizeof("{SHA}") - 1) == 0) {
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return ngx_crypt_sha(pool, key, salt, encrypted);
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#endif
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}
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/* fallback to libc crypt() */
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return ngx_libc_crypt(pool, key, salt, encrypted);
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}
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static ngx_int_t
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ngx_crypt_apr1(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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{
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ngx_int_t n;
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ngx_uint_t i;
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u_char *p, *last, final[16];
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size_t saltlen, keylen;
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ngx_md5_t md5, ctx1;
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/* Apache's apr1 crypt is Paul-Henning Kamp's md5 crypt with $apr1$ magic */
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keylen = ngx_strlen(key);
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/* true salt: no magic, max 8 chars, stop at first $ */
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salt += sizeof("$apr1$") - 1;
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last = salt + 8;
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for (p = salt; *p && *p != '$' && p < last; p++) { /* void */ }
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saltlen = p - salt;
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/* hash key and salt */
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ngx_md5_init(&md5);
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ngx_md5_update(&md5, key, keylen);
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ngx_md5_update(&md5, (u_char *) "$apr1$", sizeof("$apr1$") - 1);
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ngx_md5_update(&md5, salt, saltlen);
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ngx_md5_init(&ctx1);
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ngx_md5_update(&ctx1, key, keylen);
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ngx_md5_update(&ctx1, salt, saltlen);
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ngx_md5_update(&ctx1, key, keylen);
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ngx_md5_final(final, &ctx1);
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for (n = keylen; n > 0; n -= 16) {
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ngx_md5_update(&md5, final, n > 16 ? 16 : n);
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}
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ngx_memzero(final, sizeof(final));
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for (i = keylen; i; i >>= 1) {
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if (i & 1) {
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ngx_md5_update(&md5, final, 1);
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} else {
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ngx_md5_update(&md5, key, 1);
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}
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}
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ngx_md5_final(final, &md5);
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for (i = 0; i < 1000; i++) {
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ngx_md5_init(&ctx1);
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if (i & 1) {
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ngx_md5_update(&ctx1, key, keylen);
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} else {
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ngx_md5_update(&ctx1, final, 16);
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}
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if (i % 3) {
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ngx_md5_update(&ctx1, salt, saltlen);
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}
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if (i % 7) {
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ngx_md5_update(&ctx1, key, keylen);
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}
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if (i & 1) {
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ngx_md5_update(&ctx1, final, 16);
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} else {
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ngx_md5_update(&ctx1, key, keylen);
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}
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ngx_md5_final(final, &ctx1);
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}
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/* output */
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*encrypted = ngx_pnalloc(pool, sizeof("$apr1$") - 1 + saltlen + 16 + 1);
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if (*encrypted == NULL) {
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return NGX_ERROR;
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}
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p = ngx_cpymem(*encrypted, "$apr1$", sizeof("$apr1$") - 1);
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p = ngx_copy(p, salt, saltlen);
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*p++ = '$';
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p = ngx_crypt_to64(p, (final[ 0]<<16) | (final[ 6]<<8) | final[12], 4);
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p = ngx_crypt_to64(p, (final[ 1]<<16) | (final[ 7]<<8) | final[13], 4);
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p = ngx_crypt_to64(p, (final[ 2]<<16) | (final[ 8]<<8) | final[14], 4);
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p = ngx_crypt_to64(p, (final[ 3]<<16) | (final[ 9]<<8) | final[15], 4);
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p = ngx_crypt_to64(p, (final[ 4]<<16) | (final[10]<<8) | final[ 5], 4);
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p = ngx_crypt_to64(p, final[11], 2);
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*p = '\0';
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return NGX_OK;
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}
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static u_char *
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ngx_crypt_to64(u_char *p, uint32_t v, size_t n)
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{
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static u_char itoa64[] =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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while (n--) {
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*p++ = itoa64[v & 0x3f];
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v >>= 6;
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}
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return p;
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}
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static ngx_int_t
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ngx_crypt_plain(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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{
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size_t len;
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u_char *p;
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len = ngx_strlen(key);
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*encrypted = ngx_pnalloc(pool, sizeof("{PLAIN}") - 1 + len + 1);
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if (*encrypted == NULL) {
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return NGX_ERROR;
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}
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p = ngx_cpymem(*encrypted, "{PLAIN}", sizeof("{PLAIN}") - 1);
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ngx_memcpy(p, key, len + 1);
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return NGX_OK;
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}
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#if (NGX_HAVE_SHA1)
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static ngx_int_t
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ngx_crypt_ssha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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{
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size_t len;
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ngx_int_t rc;
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ngx_str_t encoded, decoded;
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ngx_sha1_t sha1;
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/* "{SSHA}" base64(SHA1(key salt) salt) */
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/* decode base64 salt to find out true salt */
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encoded.data = salt + sizeof("{SSHA}") - 1;
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encoded.len = ngx_strlen(encoded.data);
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len = ngx_max(ngx_base64_decoded_length(encoded.len), 20);
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decoded.data = ngx_pnalloc(pool, len);
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if (decoded.data == NULL) {
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return NGX_ERROR;
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}
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rc = ngx_decode_base64(&decoded, &encoded);
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if (rc != NGX_OK || decoded.len < 20) {
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decoded.len = 20;
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}
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/* update SHA1 from key and salt */
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ngx_sha1_init(&sha1);
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ngx_sha1_update(&sha1, key, ngx_strlen(key));
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ngx_sha1_update(&sha1, decoded.data + 20, decoded.len - 20);
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ngx_sha1_final(decoded.data, &sha1);
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/* encode it back to base64 */
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len = sizeof("{SSHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1;
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*encrypted = ngx_pnalloc(pool, len);
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if (*encrypted == NULL) {
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return NGX_ERROR;
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}
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encoded.data = ngx_cpymem(*encrypted, "{SSHA}", sizeof("{SSHA}") - 1);
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ngx_encode_base64(&encoded, &decoded);
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encoded.data[encoded.len] = '\0';
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return NGX_OK;
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}
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static ngx_int_t
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ngx_crypt_sha(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
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{
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size_t len;
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ngx_str_t encoded, decoded;
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ngx_sha1_t sha1;
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u_char digest[20];
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/* "{SHA}" base64(SHA1(key)) */
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decoded.len = sizeof(digest);
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decoded.data = digest;
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ngx_sha1_init(&sha1);
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ngx_sha1_update(&sha1, key, ngx_strlen(key));
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ngx_sha1_final(digest, &sha1);
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len = sizeof("{SHA}") - 1 + ngx_base64_encoded_length(decoded.len) + 1;
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*encrypted = ngx_pnalloc(pool, len);
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if (*encrypted == NULL) {
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return NGX_ERROR;
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}
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encoded.data = ngx_cpymem(*encrypted, "{SHA}", sizeof("{SHA}") - 1);
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ngx_encode_base64(&encoded, &decoded);
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encoded.data[encoded.len] = '\0';
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return NGX_OK;
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}
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#endif /* NGX_HAVE_SHA1 */
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#endif /* NGX_CRYPT */
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