X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=crypt.c;h=8116fb6eeacdbeaa0f1f22d14cfcc3726ee3bbbf;hb=refs%2Fheads%2Fmaint;hp=f227eb39907691d24f0eae360c04027c1653be75;hpb=35fcd604e2ec04f8667c85fa1552932b1a0e6efb;p=paraslash.git

diff --git a/crypt.c b/crypt.c
deleted file mode 100644
index f227eb39..00000000
--- a/crypt.c
+++ /dev/null
@@ -1,359 +0,0 @@
-/*
- * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
-
-/** \file crypt.c Openssl-based encryption/decryption routines. */
-
-#include <regex.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <openssl/rand.h>
-#include <openssl/err.h>
-#include <openssl/rc4.h>
-#include <openssl/pem.h>
-#include <openssl/sha.h>
-#include <openssl/bn.h>
-#include <openssl/aes.h>
-
-#include "para.h"
-#include "error.h"
-#include "string.h"
-#include "crypt.h"
-#include "fd.h"
-#include "crypt_backend.h"
-#include "base64.h"
-
-struct asymmetric_key {
-	RSA *rsa;
-};
-
-void get_random_bytes_or_die(unsigned char *buf, int num)
-{
-	unsigned long err;
-
-	/* RAND_bytes() returns 1 on success, 0 otherwise. */
-	if (RAND_bytes(buf, num) == 1)
-		return;
-	err = ERR_get_error();
-	PARA_EMERG_LOG("%s\n", ERR_reason_error_string(err));
-	exit(EXIT_FAILURE);
-}
-
-/*
- * Read 64 bytes from /dev/urandom and adds them to the SSL PRNG. Seed the PRNG
- * used by random() with a random seed obtained from SSL. If /dev/random is not
- * readable the function calls exit().
- *
- * \sa RAND_load_file(3), \ref get_random_bytes_or_die(), srandom(3),
- * random(3), \ref para_random().
- */
-void init_random_seed_or_die(void)
-{
-	int seed, ret = RAND_load_file("/dev/urandom", 64);
-
-	if (ret != 64) {
-		PARA_EMERG_LOG("could not seed PRNG (ret = %d)\n", ret);
-		exit(EXIT_FAILURE);
-	}
-	get_random_bytes_or_die((unsigned char *)&seed, sizeof(seed));
-	srandom(seed);
-}
-
-static EVP_PKEY *load_key(const char *file, int private)
-{
-	BIO *key;
-	EVP_PKEY *pkey = NULL;
-	int ret = check_key_file(file, private);
-
-	if (ret < 0) {
-		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
-		return NULL;
-	}
-	key = BIO_new(BIO_s_file());
-	if (!key)
-		return NULL;
-	if (BIO_read_filename(key, file) > 0) {
-		if (private == LOAD_PRIVATE_KEY)
-			pkey = PEM_read_bio_PrivateKey(key, NULL, NULL, NULL);
-		else
-			pkey = PEM_read_bio_PUBKEY(key, NULL, NULL, NULL);
-	}
-	BIO_free(key);
-	return pkey;
-}
-
-static int get_openssl_key(const char *key_file, RSA **rsa, int private)
-{
-	EVP_PKEY *key = load_key(key_file, private);
-
-	if (!key)
-		return (private == LOAD_PRIVATE_KEY)? -E_PRIVATE_KEY
-			: -E_PUBLIC_KEY;
-	*rsa = EVP_PKEY_get1_RSA(key);
-	EVP_PKEY_free(key);
-	if (!*rsa)
-		return -E_RSA;
-	return RSA_size(*rsa);
-}
-
-/*
- * The public key loading functions below were inspired by corresponding code
- * of openssh-5.2p1, Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo,
- * Finland. However, not much of the original code remains.
- */
-
-static int read_bignum(const unsigned char *buf, size_t len, BIGNUM **result)
-{
-	const unsigned char *p = buf, *end = buf + len;
-	uint32_t bnsize;
-	BIGNUM *bn;
-
-	if (p + 4 < p)
-		return -E_BIGNUM;
-	if (p + 4 > end)
-		return -E_BIGNUM;
-	bnsize = read_ssh_u32(p);
-	PARA_DEBUG_LOG("bnsize: %u\n", bnsize);
-	p += 4;
-	if (p + bnsize < p)
-		return -E_BIGNUM;
-	if (p + bnsize > end)
-		return -E_BIGNUM;
-	if (bnsize > 8192)
-		return -E_BIGNUM;
-	bn = BN_bin2bn(p, bnsize, NULL);
-	if (!bn)
-		return -E_BIGNUM;
-	*result = bn;
-	return bnsize + 4;
-}
-
-static int read_rsa_bignums(const unsigned char *blob, int blen, RSA **result)
-{
-	int ret;
-	RSA *rsa;
-	const unsigned char *p = blob, *end = blob + blen;
-
-	rsa = RSA_new();
-	if (!rsa)
-		return -E_BIGNUM;
-	ret = read_bignum(p, end - p, &rsa->e);
-	if (ret < 0)
-		goto fail;
-	p += ret;
-	ret = read_bignum(p, end - p, &rsa->n);
-	if (ret < 0)
-		goto fail;
-	*result = rsa;
-	return 1;
-fail:
-	RSA_free(rsa);
-	return ret;
-}
-
-int get_asymmetric_key(const char *key_file, int private,
-		struct asymmetric_key **result)
-{
-	struct asymmetric_key *key = NULL;
-	void *map = NULL;
-	unsigned char *blob = NULL;
-	size_t map_size, encoded_size, decoded_size;
-	int ret, ret2;
-	char *cp;
-
-	key = para_malloc(sizeof(*key));
-	if (private) {
-		ret = get_openssl_key(key_file, &key->rsa, LOAD_PRIVATE_KEY);
-		goto out;
-	}
-	ret = mmap_full_file(key_file, O_RDONLY, &map, &map_size, NULL);
-	if (ret < 0)
-		goto out;
-	ret = is_ssh_rsa_key(map, map_size);
-	if (!ret) {
-		ret = para_munmap(map, map_size);
-		map = NULL;
-		if (ret < 0)
-			goto out;
-		ret = get_openssl_key(key_file, &key->rsa, LOAD_PUBLIC_KEY);
-		goto out;
-	}
-	cp = map + ret;
-	encoded_size = map_size - ret;
-	PARA_INFO_LOG("decoding public rsa-ssh key %s\n", key_file);
-	ret = uudecode(cp, encoded_size, (char **)&blob, &decoded_size);
-	if (ret < 0)
-		goto out_unmap;
-	ret = check_ssh_key_header(blob, decoded_size);
-	if (ret < 0)
-		goto out_unmap;
-	ret = read_rsa_bignums(blob + ret, decoded_size - ret, &key->rsa);
-	if (ret < 0)
-		goto out_unmap;
-	ret = RSA_size(key->rsa);
-out_unmap:
-	ret2 = para_munmap(map, map_size);
-	if (ret >= 0 && ret2 < 0)
-		ret = ret2;
-out:
-	if (ret < 0) {
-		free(key);
-		*result = NULL;
-		PARA_ERROR_LOG("key %s: %s\n", key_file, para_strerror(-ret));
-	} else
-		*result = key;
-	free(blob);
-	return ret;
-}
-
-void free_asymmetric_key(struct asymmetric_key *key)
-{
-	if (!key)
-		return;
-	RSA_free(key->rsa);
-	free(key);
-}
-
-int priv_decrypt(const char *key_file, unsigned char *outbuf,
-		unsigned char *inbuf, int inlen)
-{
-	struct asymmetric_key *priv;
-	int ret;
-
-	if (inlen < 0)
-		return -E_RSA;
-	ret = get_asymmetric_key(key_file, LOAD_PRIVATE_KEY, &priv);
-	if (ret < 0)
-		return ret;
-	/*
-	 * RSA is vulnerable to timing attacks. Generate a random blinding
-	 * factor to protect against this kind of attack.
-	 */
-	ret = -E_BLINDING;
-	if (RSA_blinding_on(priv->rsa, NULL) == 0)
-		goto out;
-	ret = RSA_private_decrypt(inlen, inbuf, outbuf, priv->rsa,
-		RSA_PKCS1_OAEP_PADDING);
-	RSA_blinding_off(priv->rsa);
-	if (ret <= 0)
-		ret = -E_DECRYPT;
-out:
-	free_asymmetric_key(priv);
-	return ret;
-}
-
-int pub_encrypt(struct asymmetric_key *pub, unsigned char *inbuf,
-		unsigned len, unsigned char *outbuf)
-{
-	int ret, flen = len; /* RSA_public_encrypt expects a signed int */
-
-	if (flen < 0)
-		return -E_ENCRYPT;
-	ret = RSA_public_encrypt(flen, inbuf, outbuf, pub->rsa,
-		RSA_PKCS1_OAEP_PADDING);
-	return ret < 0? -E_ENCRYPT : ret;
-}
-
-struct aes_ctr_128_context {
-	AES_KEY key;
-	unsigned char ivec[AES_CRT128_BLOCK_SIZE];
-	unsigned char ecount[AES_CRT128_BLOCK_SIZE];
-	unsigned int num;
-};
-
-struct stream_cipher {
-	bool use_aes;
-	union {
-		RC4_KEY rc4_key;
-		struct aes_ctr_128_context aes;
-	} context;
-};
-
-struct stream_cipher *sc_new(const unsigned char *data, int len,
-		bool use_aes)
-{
-	int ret;
-	struct stream_cipher *sc = para_malloc(sizeof(*sc));
-	struct aes_ctr_128_context *aes;
-
-	sc->use_aes = use_aes;
-	if (!use_aes) {
-		RC4_set_key(&sc->context.rc4_key, len, data);
-		return sc;
-	}
-	assert(len >= 2 * AES_CRT128_BLOCK_SIZE);
-	aes = &sc->context.aes;
-	ret = AES_set_encrypt_key(data, AES_CRT128_BLOCK_SIZE * 8 /* bits */,
-		&aes->key);
-	assert(ret == 0);
-	memcpy(aes->ivec, data + AES_CRT128_BLOCK_SIZE, AES_CRT128_BLOCK_SIZE);
-	aes->num = 0;
-	return sc;
-}
-
-void sc_free(struct stream_cipher *sc)
-{
-	free(sc);
-}
-
-/**
- * The RC4() implementation of openssl apparently reads and writes data in
- * blocks of 8 bytes. So we have to make sure our buffer sizes are a multiple
- * of this.
- */
-#define RC4_ALIGN 8
-
-static void rc4_crypt(RC4_KEY *key, struct iovec *src, struct iovec *dst)
-{
-	size_t len = src->iov_len, l1, l2;
-
-	assert(len > 0);
-	assert(len < ((typeof(src->iov_len))-1) / 2);
-	l1 = ROUND_DOWN(len, RC4_ALIGN);
-	l2 = ROUND_UP(len, RC4_ALIGN);
-
-	*dst = (typeof(*dst)) {
-		/* Add one for the terminating zero byte. */
-		.iov_base = para_malloc(l2 + 1),
-		.iov_len = len
-	};
-	RC4(key, l1, src->iov_base, dst->iov_base);
-	if (len > l1) {
-		unsigned char remainder[RC4_ALIGN] = "";
-		memcpy(remainder, src->iov_base + l1, len - l1);
-		RC4(key, len - l1, remainder, dst->iov_base + l1);
-	}
-	((char *)dst->iov_base)[len] = '\0';
-}
-
-static void aes_ctr128_crypt(struct aes_ctr_128_context *aes, struct iovec *src,
-		struct iovec *dst)
-{
-	size_t len = src->iov_len;
-
-	*dst = (typeof(*dst)) {
-		/* Add one for the terminating zero byte. */
-		.iov_base = para_malloc(len + 1),
-		.iov_len = len
-	};
-	AES_ctr128_encrypt(src->iov_base, dst->iov_base, len,
-		&aes->key, aes->ivec, aes->ecount, &aes->num);
-	((char *)dst->iov_base)[len] = '\0';
-}
-
-void sc_crypt(struct stream_cipher *sc, struct iovec *src, struct iovec *dst)
-{
-	if (sc->use_aes)
-		return aes_ctr128_crypt(&sc->context.aes, src, dst);
-	return rc4_crypt(&sc->context.rc4_key, src, dst);
-}
-
-void hash_function(const char *data, unsigned long len, unsigned char *hash)
-{
-	SHA_CTX c;
-	SHA1_Init(&c);
-	SHA1_Update(&c, data, len);
-	SHA1_Final(hash, &c);
-}