Switch from gnutls to openssl for sha1

The reason for this is because openssl can be statically linked
against, gnutls cannot.

Signed-off-by: Serge Hallyn <shallyn@cisco.com>

diff --git a/configure.ac b/configure.ac
index b5cf5c7593b1b6dd6bd8124861cb7a3b676a828a..be0f715dd7ded181f75e11e09bd3cd44eafc5512 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -257,6 +257,8 @@ fi
 
 AM_CONDITIONAL([ENABLE_API_DOCS], [test "x$HAVE_DOXYGEN" != "x"])
 
+AC_CONFIG_MACRO_DIRS([config])
+
 # Apparmor
 AC_ARG_ENABLE([apparmor],
        [AC_HELP_STRING([--enable-apparmor], [enable apparmor support [default=auto]])],
@@ -267,20 +269,21 @@ if test "$enable_apparmor" = "auto" ; then
 fi
 AM_CONDITIONAL([ENABLE_APPARMOR], [test "x$enable_apparmor" = "xyes"])
 
-# GnuTLS
-AC_ARG_ENABLE([gnutls],
-       [AC_HELP_STRING([--enable-gnutls], [enable GnuTLS support [default=auto]])],
-       [], [enable_gnutls=auto])
+# OpenSSL
+# libssl-dev
+AC_ARG_ENABLE([openssl],
+       [AC_HELP_STRING([--enable-openssl], [enable OpenSSL support [default=auto]])],
+       [], [enable_openssl=auto])
+
+if test "$enable_openssl" = "auto" ; then
+       AC_CHECK_LIB([ssl], [OPENSSL_init_ssl], [enable_openssl=yes], [enable_openssl=no])
 
-if test "$enable_gnutls" = "auto" ; then
-       AC_CHECK_LIB([gnutls], [gnutls_hash_fast], [enable_gnutls=yes], [enable_gnutls=no])
 fi
-AM_CONDITIONAL([ENABLE_GNUTLS], [test "x$enable_gnutls" = "xyes"])
+AM_CONDITIONAL([ENABLE_OPENSSL], [test "x$enable_openssl" = "xyes"])
 
-AM_COND_IF([ENABLE_GNUTLS],
-       [AC_CHECK_HEADER([gnutls/gnutls.h],[],[AC_MSG_ERROR([You must install the GnuTLS development package in order to compile lxc])])
-       AC_CHECK_LIB([gnutls], [gnutls_hash_fast],[true],[AC_MSG_ERROR([You must install the GnuTLS development package in order to compile lxc])])
-       AC_SUBST([GNUTLS_LIBS], [-lgnutls])])
+AM_COND_IF([ENABLE_OPENSSL],
+       [AC_CHECK_HEADER([openssl/engine.h],[],[AC_MSG_ERROR([You must install the OpenSSL development package in order to compile lxc])])
+       AC_SUBST([OPENSSL_LIBS], '-lssl -lcrypto')])
 
 # SELinux
 AC_ARG_ENABLE([selinux],
@@ -992,7 +995,7 @@ Environment:
  - distribution: $with_distro
  - init script type(s): $init_script
  - rpath: $enable_rpath
- - GnuTLS: $enable_gnutls
+ - OpenSSL: $enable_openssl
  - Bash integration: $enable_bash
 
 Security features:

diff --git a/src/lxc/Makefile.am b/src/lxc/Makefile.am
index c82d6e51621549a846ad492188a12fec25ada4ca..ff09c590afc03faafb31fc070f979c27fb3eeec0 100644 (file)
--- a/src/lxc/Makefile.am
+++ b/src/lxc/Makefile.am
@@ -207,8 +207,8 @@ if ENABLE_APPARMOR
 AM_CFLAGS += -DHAVE_APPARMOR
 endif
 
-if ENABLE_GNUTLS
-AM_CFLAGS += -DHAVE_LIBGNUTLS
+if ENABLE_OPENSSL
+AM_CFLAGS += -DHAVE_OPENSSL
 endif
 
 if ENABLE_SECCOMP
@@ -240,7 +240,7 @@ liblxc_la_LDFLAGS = -pthread \
                    -version-info @LXC_ABI_MAJOR@
 
 liblxc_la_LIBADD = $(CAP_LIBS) \
-                  $(GNUTLS_LIBS) \
+                  $(OPENSSL_LIBS) \
                   $(SELINUX_LIBS) \
                   $(SECCOMP_LIBS)
 
@@ -298,7 +298,7 @@ endif
 
 LDADD = liblxc.la \
        @CAP_LIBS@ \
-       @GNUTLS_LIBS@ \
+       @OPENSSL_LIBS@ \
        @SECCOMP_LIBS@ \
        @SELINUX_LIBS@
 

diff --git a/src/lxc/lxccontainer.c b/src/lxc/lxccontainer.c
index 24f60a8af0e00746c33b27484f83622358d9ba11..d6b88a5fd1eb0c6ab7def2d95e16998c032a1c81 100644 (file)
--- a/src/lxc/lxccontainer.c
+++ b/src/lxc/lxccontainer.c
@@ -76,6 +76,10 @@
 #include "utils.h"
 #include "version.h"
 
+#if HAVE_OPENSSL
+#include <openssl/evp.h>
+#endif
+
 /* major()/minor() */
 #ifdef MAJOR_IN_MKDEV
 #include <sys/mkdev.h>
@@ -1632,9 +1636,9 @@ static bool prepend_lxc_header(char *path, const char *t, char *const argv[])
        char *contents;
        FILE *f;
        int ret = -1;
-#if HAVE_LIBGNUTLS
-       int i;
-       unsigned char md_value[SHA_DIGEST_LENGTH];
+#if HAVE_OPENSSL
+       int i, md_len = 0;
+       unsigned char md_value[EVP_MAX_MD_SIZE];
        char *tpath;
 #endif
 
@@ -1675,14 +1679,14 @@ static bool prepend_lxc_header(char *path, const char *t, char *const argv[])
        if (ret < 0)
                goto out_free_contents;
 
-#if HAVE_LIBGNUTLS
+#if HAVE_OPENSSL
        tpath = get_template_path(t);
        if (!tpath) {
                ERROR("Invalid template \"%s\" specified", t);
                goto out_free_contents;
        }
 
-       ret = sha1sum_file(tpath, md_value);
+       ret = sha1sum_file(tpath, md_value, &md_len);
        if (ret < 0) {
                ERROR("Failed to get sha1sum of %s", tpath);
                free(tpath);
@@ -1708,9 +1712,9 @@ static bool prepend_lxc_header(char *path, const char *t, char *const argv[])
                fprintf(f, "\n");
        }
 
-#if HAVE_LIBGNUTLS
+#if HAVE_OPENSSL
        fprintf(f, "# Template script checksum (SHA-1): ");
-       for (i=0; i<SHA_DIGEST_LENGTH; i++)
+       for (i=0; i<md_len; i++)
                fprintf(f, "%02x", md_value[i]);
        fprintf(f, "\n");
 #endif

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 7a4416fd86175855af6508faf44ff3b662635926..21c1ae8e30573f7201554b41d0d5431f42acd402 100644 (file)
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -330,17 +330,30 @@ again:
        return status;
 }
 
-#if HAVE_LIBGNUTLS
-#include <gnutls/gnutls.h>
-#include <gnutls/crypto.h>
+#ifdef HAVE_OPENSSL
+#include <openssl/evp.h>
 
-__attribute__((constructor))
-static void gnutls_lxc_init(void)
+static int do_sha1_hash(const char *buf, int buflen, unsigned char *md_value, int *md_len)
 {
-       gnutls_global_init();
+       EVP_MD_CTX *mdctx;
+       const EVP_MD *md;
+
+       md = EVP_get_digestbyname("sha1");
+       if(!md) {
+               printf("Unknown message digest: sha1\n");
+               return -1;
+       }
+
+       mdctx = EVP_MD_CTX_new();
+       EVP_DigestInit_ex(mdctx, md, NULL);
+       EVP_DigestUpdate(mdctx, buf, buflen);
+       EVP_DigestFinal_ex(mdctx, md_value, md_len);
+       EVP_MD_CTX_free(mdctx);
+
+       return 0;
 }
 
-int sha1sum_file(char *fnam, unsigned char *digest)
+int sha1sum_file(char *fnam, unsigned char *digest, int *md_len)
 {
        char *buf;
        int ret;
@@ -394,7 +407,7 @@ int sha1sum_file(char *fnam, unsigned char *digest)
        }
 
        buf[flen] = '\0';
-       ret = gnutls_hash_fast(GNUTLS_DIG_SHA1, buf, flen, (void *)digest);
+       ret = do_sha1_hash(buf, flen, (void *)digest, md_len);
        free(buf);
        return ret;
 }

diff --git a/src/lxc/utils.h b/src/lxc/utils.h
index 3f420ae714b9082722ae7840b53f0d270fd8e880..268cff011c1ad1d7a7bae3f604fcf778b1c24ba8 100644 (file)
--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -98,9 +98,8 @@ extern int lxc_pclose(struct lxc_popen_FILE *fp);
 extern int wait_for_pid(pid_t pid);
 extern int lxc_wait_for_pid_status(pid_t pid);
 
-#if HAVE_LIBGNUTLS
-#define SHA_DIGEST_LENGTH 20
-extern int sha1sum_file(char *fnam, unsigned char *md_value);
+#if HAVE_OPENSSL
+extern int sha1sum_file(char *fnam, unsigned char *md_value, int *md_len);
 #endif
 
 /* initialize rand with urandom */