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Diffstat (limited to '')
| -rw-r--r-- | contrib/slapd-modules/passwd/pbkdf2/pw-pbkdf2.c | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/contrib/slapd-modules/passwd/pbkdf2/pw-pbkdf2.c b/contrib/slapd-modules/passwd/pbkdf2/pw-pbkdf2.c new file mode 100644 index 0000000..a931179 --- /dev/null +++ b/contrib/slapd-modules/passwd/pbkdf2/pw-pbkdf2.c @@ -0,0 +1,451 @@ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2009-2021 The OpenLDAP Foundation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted only as authorized by the OpenLDAP + * Public License. + * + * A copy of this license is available in the file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * <http://www.OpenLDAP.org/license.html>. + */ +/* ACKNOWLEDGEMENT: + * This work was initially developed by HAMANO Tsukasa <hamano@osstech.co.jp> + */ + +#define _GNU_SOURCE + +#include "portable.h" +#include <ac/string.h> +#include "lber_pvt.h" +#include "lutil.h" +#include <stdio.h> +#include <stdlib.h> + +#ifdef HAVE_OPENSSL +#include <openssl/evp.h> +#elif HAVE_GNUTLS +#include <nettle/pbkdf2.h> +#include <nettle/hmac.h> +typedef void (*pbkdf2_hmac_update)(void *, unsigned, const uint8_t *); +typedef void (*pbkdf2_hmac_digest)(void *, unsigned, uint8_t *); +#else +#error Unsupported crypto backend. +#endif + +#define PBKDF2_ITERATION 10000 +#define PBKDF2_SALT_SIZE 16 +#define PBKDF2_SHA1_DK_SIZE 20 +#define PBKDF2_SHA256_DK_SIZE 32 +#define PBKDF2_SHA512_DK_SIZE 64 +#define PBKDF2_MAX_DK_SIZE 64 + +const struct berval pbkdf2_scheme = BER_BVC("{PBKDF2}"); +const struct berval pbkdf2_sha1_scheme = BER_BVC("{PBKDF2-SHA1}"); +const struct berval pbkdf2_sha256_scheme = BER_BVC("{PBKDF2-SHA256}"); +const struct berval pbkdf2_sha512_scheme = BER_BVC("{PBKDF2-SHA512}"); + +/* + * Converting base64 string to adapted base64 string. + * Adapted base64 encode is identical to general base64 encode except + * that it uses '.' instead of '+', and omits trailing padding '=' and + * whitepsace. + * see http://pythonhosted.org/passlib/lib/passlib.utils.html + * This is destructive function. + */ +static int b64_to_ab64(char *str) +{ + char *p = str; + do { + if(*p == '+'){ + *p = '.'; + } + if(*p == '='){ + *p = '\0'; + } + } while(*p++); + return 0; +} + +/* + * Converting adapted base64 string to base64 string. + * dstsize will require src length + 2, due to output string have + * potential to append "=" or "==". + * return -1 if few output buffer. + */ +static int ab64_to_b64(char *src, char *dst, size_t dstsize){ + int i; + char *p = src; + for(i=0; p[i] && p[i] != '$'; i++){ + if(i >= dstsize){ + dst[0] = '\0'; + return -1; + } + if(p[i] == '.'){ + dst[i] = '+'; + }else{ + dst[i] = p[i]; + } + } + for(;i%4;i++){ + if(i >= dstsize){ + dst[0] = '\0'; + return -1; + } + dst[i] = '='; + } + dst[i] = '\0'; + return 0; +} + +static int pbkdf2_format( + const struct berval *sc, + int iteration, + const struct berval *salt, + const struct berval *dk, + struct berval *msg) +{ + + int rc, msg_len; + char salt_b64[LUTIL_BASE64_ENCODE_LEN(PBKDF2_SALT_SIZE) + 1]; + char dk_b64[LUTIL_BASE64_ENCODE_LEN(PBKDF2_MAX_DK_SIZE) + 1]; + + rc = lutil_b64_ntop((unsigned char *)salt->bv_val, salt->bv_len, + salt_b64, sizeof(salt_b64)); + if(rc < 0){ + return LUTIL_PASSWD_ERR; + } + b64_to_ab64(salt_b64); + rc = lutil_b64_ntop((unsigned char *)dk->bv_val, dk->bv_len, + dk_b64, sizeof(dk_b64)); + if(rc < 0){ + return LUTIL_PASSWD_ERR; + } + b64_to_ab64(dk_b64); + msg_len = asprintf(&msg->bv_val, "%s%d$%s$%s", + sc->bv_val, iteration, + salt_b64, dk_b64); + if(msg_len < 0){ + msg->bv_len = 0; + return LUTIL_PASSWD_ERR; + } + + msg->bv_len = msg_len; + return LUTIL_PASSWD_OK; +} + +static int pbkdf2_encrypt( + const struct berval *scheme, + const struct berval *passwd, + struct berval *msg, + const char **text) +{ + unsigned char salt_value[PBKDF2_SALT_SIZE]; + struct berval salt; + unsigned char dk_value[PBKDF2_MAX_DK_SIZE]; + struct berval dk; + int iteration = PBKDF2_ITERATION; + int rc; +#ifdef HAVE_OPENSSL + const EVP_MD *md; +#elif HAVE_GNUTLS + struct hmac_sha1_ctx sha1_ctx; + struct hmac_sha256_ctx sha256_ctx; + struct hmac_sha512_ctx sha512_ctx; + void * current_ctx = NULL; + pbkdf2_hmac_update current_hmac_update = NULL; + pbkdf2_hmac_digest current_hmac_digest = NULL; +#endif + + salt.bv_val = (char *)salt_value; + salt.bv_len = sizeof(salt_value); + dk.bv_val = (char *)dk_value; + +#ifdef HAVE_OPENSSL + if(!ber_bvcmp(scheme, &pbkdf2_scheme)){ + dk.bv_len = PBKDF2_SHA1_DK_SIZE; + md = EVP_sha1(); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha1_scheme)){ + dk.bv_len = PBKDF2_SHA1_DK_SIZE; + md = EVP_sha1(); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha256_scheme)){ + dk.bv_len = PBKDF2_SHA256_DK_SIZE; + md = EVP_sha256(); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha512_scheme)){ + dk.bv_len = PBKDF2_SHA512_DK_SIZE; + md = EVP_sha512(); + }else{ + return LUTIL_PASSWD_ERR; + } +#elif HAVE_GNUTLS + if(!ber_bvcmp(scheme, &pbkdf2_scheme)){ + dk.bv_len = PBKDF2_SHA1_DK_SIZE; + current_ctx = &sha1_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha1_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha1_digest; + hmac_sha1_set_key(current_ctx, passwd->bv_len, (const uint8_t *) passwd->bv_val); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha1_scheme)){ + dk.bv_len = PBKDF2_SHA1_DK_SIZE; + current_ctx = &sha1_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha1_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha1_digest; + hmac_sha1_set_key(current_ctx, passwd->bv_len, (const uint8_t *) passwd->bv_val); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha256_scheme)){ + dk.bv_len = PBKDF2_SHA256_DK_SIZE; + current_ctx = &sha256_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha256_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha256_digest; + hmac_sha256_set_key(current_ctx, passwd->bv_len, (const uint8_t *) passwd->bv_val); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha512_scheme)){ + dk.bv_len = PBKDF2_SHA512_DK_SIZE; + current_ctx = &sha512_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha512_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha512_digest; + hmac_sha512_set_key(current_ctx, passwd->bv_len, (const uint8_t *) passwd->bv_val); + }else{ + return LUTIL_PASSWD_ERR; + } +#endif + + if(lutil_entropy((unsigned char *)salt.bv_val, salt.bv_len) < 0){ + return LUTIL_PASSWD_ERR; + } + +#ifdef HAVE_OPENSSL + if(!PKCS5_PBKDF2_HMAC(passwd->bv_val, passwd->bv_len, + (unsigned char *)salt.bv_val, salt.bv_len, + iteration, md, dk.bv_len, dk_value)){ + return LUTIL_PASSWD_ERR; + } +#elif HAVE_GNUTLS + PBKDF2(current_ctx, current_hmac_update, current_hmac_digest, + dk.bv_len, iteration, + salt.bv_len, (const uint8_t *) salt.bv_val, + dk.bv_len, dk_value); +#endif + +#ifdef SLAPD_PBKDF2_DEBUG + printf("Encrypt for %s\n", scheme->bv_val); + printf(" Password:\t%s\n", passwd->bv_val); + + printf(" Salt:\t\t"); + int i; + for(i=0; i<salt.bv_len; i++){ + printf("%02x", salt_value[i]); + } + printf("\n"); + printf(" Iteration:\t%d\n", iteration); + + printf(" DK:\t\t"); + for(i=0; i<dk.bv_len; i++){ + printf("%02x", dk_value[i]); + } + printf("\n"); +#endif + + rc = pbkdf2_format(scheme, iteration, &salt, &dk, msg); + +#ifdef SLAPD_PBKDF2_DEBUG + printf(" Output:\t%s\n", msg->bv_val); +#endif + + return rc; +} + +static int pbkdf2_check( + const struct berval *scheme, + const struct berval *passwd, + const struct berval *cred, + const char **text) +{ + int rc; + int iteration; + + /* salt_value require PBKDF2_SALT_SIZE + 1 in lutil_b64_pton. */ + unsigned char salt_value[PBKDF2_SALT_SIZE + 1]; + char salt_b64[LUTIL_BASE64_ENCODE_LEN(PBKDF2_SALT_SIZE) + 1]; + /* dk_value require PBKDF2_MAX_DK_SIZE + 1 in lutil_b64_pton. */ + unsigned char dk_value[PBKDF2_MAX_DK_SIZE + 1]; + char dk_b64[LUTIL_BASE64_ENCODE_LEN(PBKDF2_MAX_DK_SIZE) + 1]; + unsigned char input_dk_value[PBKDF2_MAX_DK_SIZE]; + size_t dk_len; +#ifdef HAVE_OPENSSL + const EVP_MD *md; +#elif HAVE_GNUTLS + struct hmac_sha1_ctx sha1_ctx; + struct hmac_sha256_ctx sha256_ctx; + struct hmac_sha512_ctx sha512_ctx; + void * current_ctx = NULL; + pbkdf2_hmac_update current_hmac_update = NULL; + pbkdf2_hmac_digest current_hmac_digest = NULL; +#endif + +#ifdef SLAPD_PBKDF2_DEBUG + printf("Checking for %s\n", scheme->bv_val); + printf(" Stored Value:\t%s\n", passwd->bv_val); + printf(" Input Cred:\t%s\n", cred->bv_val); +#endif + +#ifdef HAVE_OPENSSL + if(!ber_bvcmp(scheme, &pbkdf2_scheme)){ + dk_len = PBKDF2_SHA1_DK_SIZE; + md = EVP_sha1(); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha1_scheme)){ + dk_len = PBKDF2_SHA1_DK_SIZE; + md = EVP_sha1(); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha256_scheme)){ + dk_len = PBKDF2_SHA256_DK_SIZE; + md = EVP_sha256(); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha512_scheme)){ + dk_len = PBKDF2_SHA512_DK_SIZE; + md = EVP_sha512(); + }else{ + return LUTIL_PASSWD_ERR; + } +#elif HAVE_GNUTLS + if(!ber_bvcmp(scheme, &pbkdf2_scheme)){ + dk_len = PBKDF2_SHA1_DK_SIZE; + current_ctx = &sha1_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha1_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha1_digest; + hmac_sha1_set_key(current_ctx, cred->bv_len, (const uint8_t *) cred->bv_val); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha1_scheme)){ + dk_len = PBKDF2_SHA1_DK_SIZE; + current_ctx = &sha1_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha1_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha1_digest; + hmac_sha1_set_key(current_ctx, cred->bv_len, (const uint8_t *) cred->bv_val); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha256_scheme)){ + dk_len = PBKDF2_SHA256_DK_SIZE; + current_ctx = &sha256_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha256_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha256_digest; + hmac_sha256_set_key(current_ctx, cred->bv_len, (const uint8_t *) cred->bv_val); + }else if(!ber_bvcmp(scheme, &pbkdf2_sha512_scheme)){ + dk_len = PBKDF2_SHA512_DK_SIZE; + current_ctx = &sha512_ctx; + current_hmac_update = (pbkdf2_hmac_update) &hmac_sha512_update; + current_hmac_digest = (pbkdf2_hmac_digest) &hmac_sha512_digest; + hmac_sha512_set_key(current_ctx, cred->bv_len, (const uint8_t *) cred->bv_val); + }else{ + return LUTIL_PASSWD_ERR; + } +#endif + + iteration = atoi(passwd->bv_val); + if(iteration < 1){ + return LUTIL_PASSWD_ERR; + } + + char *ptr; + ptr = strchr(passwd->bv_val, '$'); + if(!ptr){ + return LUTIL_PASSWD_ERR; + } + ptr++; /* skip '$' */ + rc = ab64_to_b64(ptr, salt_b64, sizeof(salt_b64)); + if(rc < 0){ + return LUTIL_PASSWD_ERR; + } + + ptr = strchr(ptr, '$'); + if(!ptr){ + return LUTIL_PASSWD_ERR; + } + ptr++; /* skip '$' */ + rc = ab64_to_b64(ptr, dk_b64, sizeof(dk_b64)); + if(rc < 0){ + return LUTIL_PASSWD_ERR; + } + + /* The targetsize require PBKDF2_SALT_SIZE + 1 in lutil_b64_pton. */ + rc = lutil_b64_pton(salt_b64, salt_value, PBKDF2_SALT_SIZE + 1); + if(rc < 0){ + return LUTIL_PASSWD_ERR; + } + + /* consistency check */ + if(rc != PBKDF2_SALT_SIZE){ + return LUTIL_PASSWD_ERR; + } + + /* The targetsize require PBKDF2_MAX_DK_SIZE + 1 in lutil_b64_pton. */ + rc = lutil_b64_pton(dk_b64, dk_value, sizeof(dk_value)); + if(rc < 0){ + return LUTIL_PASSWD_ERR; + } + + /* consistency check */ + if(rc != dk_len){ + return LUTIL_PASSWD_ERR; + } + +#ifdef HAVE_OPENSSL + if(!PKCS5_PBKDF2_HMAC(cred->bv_val, cred->bv_len, + salt_value, PBKDF2_SALT_SIZE, + iteration, md, dk_len, input_dk_value)){ + return LUTIL_PASSWD_ERR; + } +#elif HAVE_GNUTLS + PBKDF2(current_ctx, current_hmac_update, current_hmac_digest, + dk_len, iteration, + PBKDF2_SALT_SIZE, salt_value, + dk_len, input_dk_value); +#endif + + rc = memcmp(dk_value, input_dk_value, dk_len); +#ifdef SLAPD_PBKDF2_DEBUG + printf(" Iteration:\t%d\n", iteration); + printf(" Base64 Salt:\t%s\n", salt_b64); + printf(" Base64 DK:\t%s\n", dk_b64); + int i; + printf(" Stored Salt:\t"); + for(i=0; i<PBKDF2_SALT_SIZE; i++){ + printf("%02x", salt_value[i]); + } + printf("\n"); + + printf(" Stored DK:\t"); + for(i=0; i<dk_len; i++){ + printf("%02x", dk_value[i]); + } + printf("\n"); + + printf(" Input DK:\t"); + for(i=0; i<dk_len; i++){ + printf("%02x", input_dk_value[i]); + } + printf("\n"); + printf(" Result:\t%d\n", rc); +#endif + return rc?LUTIL_PASSWD_ERR:LUTIL_PASSWD_OK; +} + +int init_module(int argc, char *argv[]) { + int rc; + rc = lutil_passwd_add((struct berval *)&pbkdf2_scheme, + pbkdf2_check, pbkdf2_encrypt); + if(rc) return rc; + rc = lutil_passwd_add((struct berval *)&pbkdf2_sha1_scheme, + pbkdf2_check, pbkdf2_encrypt); + if(rc) return rc; + + rc = lutil_passwd_add((struct berval *)&pbkdf2_sha256_scheme, + pbkdf2_check, pbkdf2_encrypt); + if(rc) return rc; + + rc = lutil_passwd_add((struct berval *)&pbkdf2_sha512_scheme, + pbkdf2_check, pbkdf2_encrypt); + return rc; +} + +/* + * Local variables: + * indent-tabs-mode: t + * tab-width: 4 + * c-basic-offset: 4 + * End: + */ |