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157 lines
4.4 KiB
157 lines
4.4 KiB
From 8aa9ae816ddf66921b4a8a0f422517e6f2e55ac6 Mon Sep 17 00:00:00 2001
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From: Simo Sorce <simo@redhat.com>
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Date: Wed, 27 Mar 2019 14:29:08 -0400
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Subject: [PATCH] Use Openssl RC4 when available
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Signed-off-by: Simo Sorce <simo@redhat.com>
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---
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configure.ac | 5 +--
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plugins/digestmd5.c | 107 +++++++++++++++++++++++++++++++++++++++++++-
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2 files changed, 108 insertions(+), 4 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index 388f5d02..cfdee4a2 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -1103,13 +1103,12 @@ AC_ARG_WITH(configdir, [ --with-configdir=DIR set the directory where confi
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configdir='${plugindir}:${sysconfdir}/sasl2')
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AC_SUBST(configdir)
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-dnl look for rc4 libraries. we accept the CMU one or one from openSSL
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-AC_ARG_WITH(rc4, [ --with-rc4 use internal rc4 routines [[yes]] ],
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+AC_ARG_WITH(rc4, [ --with-rc4 use rc4 routines [[yes]] ],
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with_rc4=$withval,
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with_rc4=yes)
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if test "$with_rc4" != no; then
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- AC_DEFINE(WITH_RC4,[],[Use internal RC4 implementation?])
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+ AC_DEFINE(WITH_RC4,[],[Use RC4])
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fi
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building_for_macosx=no
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diff --git a/plugins/digestmd5.c b/plugins/digestmd5.c
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index df35093d..c6b54317 100644
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--- a/plugins/digestmd5.c
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+++ b/plugins/digestmd5.c
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@@ -1117,6 +1117,111 @@ static void free_des(context_t *text)
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#endif /* WITH_DES */
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#ifdef WITH_RC4
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+#ifdef HAVE_OPENSSL
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+#include <openssl/evp.h>
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+
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+static void free_rc4(context_t *text)
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+{
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+ if (text->cipher_enc_context) {
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+ EVP_CIPHER_CTX_free((EVP_CIPHER_CTX *)text->cipher_enc_context);
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+ text->cipher_enc_context = NULL;
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+ }
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+ if (text->cipher_dec_context) {
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+ EVP_CIPHER_CTX_free((EVP_CIPHER_CTX *)text->cipher_dec_context);
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+ text->cipher_dec_context = NULL;
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+ }
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+}
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+
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+static int init_rc4(context_t *text,
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+ unsigned char enckey[16],
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+ unsigned char deckey[16])
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+{
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+ EVP_CIPHER_CTX *ctx;
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+ int rc;
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+
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+ ctx = EVP_CIPHER_CTX_new();
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+ if (ctx == NULL) return SASL_NOMEM;
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+
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+ rc = EVP_EncryptInit_ex(ctx, EVP_rc4(), NULL, enckey, NULL);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ text->cipher_enc_context = (void *)ctx;
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+
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+ ctx = EVP_CIPHER_CTX_new();
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+ if (ctx == NULL) return SASL_NOMEM;
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+
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+ rc = EVP_DecryptInit_ex(ctx, EVP_rc4(), NULL, deckey, NULL);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ text->cipher_dec_context = (void *)ctx;
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+
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+ return SASL_OK;
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+}
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+
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+static int dec_rc4(context_t *text,
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+ const char *input,
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+ unsigned inputlen,
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+ unsigned char digest[16] __attribute__((unused)),
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+ char *output,
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+ unsigned *outputlen)
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+{
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+ int len;
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+ int rc;
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+
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+ /* decrypt the text part & HMAC */
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+ rc = EVP_DecryptUpdate((EVP_CIPHER_CTX *)text->cipher_dec_context,
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+ (unsigned char *)output, &len,
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+ (const unsigned char *)input, inputlen);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ *outputlen = len;
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+
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+ rc = EVP_DecryptFinal_ex((EVP_CIPHER_CTX *)text->cipher_dec_context,
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+ (unsigned char *)output + len, &len);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ *outputlen += len;
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+
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+ /* subtract the HMAC to get the text length */
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+ *outputlen -= 10;
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+
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+ return SASL_OK;
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+}
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+
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+static int enc_rc4(context_t *text,
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+ const char *input,
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+ unsigned inputlen,
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+ unsigned char digest[16],
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+ char *output,
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+ unsigned *outputlen)
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+{
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+ int len;
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+ int rc;
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+ /* encrypt the text part */
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+ rc = EVP_EncryptUpdate((EVP_CIPHER_CTX *)text->cipher_enc_context,
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+ (unsigned char *)output, &len,
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+ (const unsigned char *)input, inputlen);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ *outputlen = len;
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+
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+ /* encrypt the `MAC part */
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+ rc = EVP_EncryptUpdate((EVP_CIPHER_CTX *)text->cipher_enc_context,
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+ (unsigned char *)output + *outputlen, &len,
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+ digest, 10);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ *outputlen += len;
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+
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+ rc = EVP_EncryptFinal_ex((EVP_CIPHER_CTX *)text->cipher_enc_context,
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+ (unsigned char *)output + *outputlen, &len);
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+ if (rc != 1) return SASL_FAIL;
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+
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+ *outputlen += len;
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+
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+ return SASL_OK;
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+}
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+#else
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/* quick generic implementation of RC4 */
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struct rc4_context_s {
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unsigned char sbox[256];
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@@ -1296,7 +1401,7 @@ static int enc_rc4(context_t *text,
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return SASL_OK;
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}
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-
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+#endif /* HAVE_OPENSSL */
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#endif /* WITH_RC4 */
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struct digest_cipher available_ciphers[] =
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