Add X509_STORE_load_mem() to load certificates from a memory buffer

instead of disk.  OpenSSL didn't provide a built-in API from loading
certificates in a chroot'ed process that doesn't have direct access to
the files.  X509_STORE_load_mem() provides a new backend that will be
used by libssl and libtls to implement such privsep-friendly
functionality.

Adopted for LibreSSL based on older code from relayd (by pyr@ and myself)
With feedback and OK bluhm@

4 files changed, 168 insertions, 3 deletions

diff --git a/lib/libcrypto/shlib_version b/lib/libcrypto/shlib_version
index ac20b1fad52..06b524dace1 100644
--- a/lib/libcrypto/shlib_version
+++ b/lib/libcrypto/shlib_version
@@ -1,2 +1,2 @@
 major=30
-minor=3
+minor=4
diff --git a/lib/libcrypto/x509/by_mem.c b/lib/libcrypto/x509/by_mem.c
new file mode 100644
index 00000000000..6a6ae961317
--- /dev/null
+++ b/lib/libcrypto/x509/by_mem.c
@@ -0,0 +1,138 @@
+/* $OpenBSD: by_mem.c,v 1.1 2015/01/22 09:06:39 reyk Exp $ */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <sys/uio.h>
+#include <errno.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <openssl/buffer.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/lhash.h>
+#include <openssl/x509.h>
+
+static int by_mem_ctrl(X509_LOOKUP *, int, const char *, long, char **);
+
+X509_LOOKUP_METHOD x509_mem_lookup = {
+	"Load cert from memory",
+	NULL,		/* new */
+	NULL,		/* free */
+	NULL,		/* init */
+	NULL,		/* shutdown */
+	by_mem_ctrl,	/* ctrl */
+	NULL,		/* get_by_subject */
+	NULL,		/* get_by_issuer_serial */
+	NULL,		/* get_by_fingerprint */
+	NULL,		/* get_by_alias */
+};
+
+X509_LOOKUP_METHOD *
+X509_LOOKUP_mem(void)
+{
+	return (&x509_mem_lookup);
+}
+
+static int
+by_mem_ctrl(X509_LOOKUP *lu, int cmd, const char *buf,
+    long type, char **ret)
+{
+	STACK_OF(X509_INFO)	*inf = NULL;
+	const struct iovec	*iov;
+	X509_INFO		*itmp;
+	BIO			*in = NULL;
+	int			 i, count = 0, ok = 0;
+
+	iov = (const struct iovec *)buf;
+
+	if (!(cmd == X509_L_MEM && type == X509_FILETYPE_PEM))
+		goto done;
+
+	if ((in = BIO_new_mem_buf(iov->iov_base, iov->iov_len)) == NULL)
+		goto done;
+
+	if ((inf = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL)) == NULL)
+		goto done;
+
+	for (i = 0; i < sk_X509_INFO_num(inf); i++) {
+		itmp = sk_X509_INFO_value(inf, i);
+		if (itmp->x509) {
+			ok = X509_STORE_add_cert(lu->store_ctx, itmp->x509);
+			if (!ok)
+				goto done;
+			count++;
+		}
+		if (itmp->crl) {
+			ok = X509_STORE_add_crl(lu->store_ctx, itmp->crl);
+			if (!ok)
+				goto done;
+			count++;
+		}
+	}
+
+	ok = count != 0;
+ done:
+	if (count == 0)
+		X509err(X509_F_X509_LOAD_CERT_CRL_FILE,ERR_R_PEM_LIB);
+	if (inf != NULL)
+		sk_X509_INFO_pop_free(inf, X509_INFO_free);
+	if (in != NULL)
+		BIO_free(in);
+	return (ok);
+}
diff --git a/lib/libcrypto/x509/x509_d2.c b/lib/libcrypto/x509/x509_d2.c
index cc22f4f4708..5b0f80adda9 100644
--- a/lib/libcrypto/x509/x509_d2.c
+++ b/lib/libcrypto/x509/x509_d2.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: x509_d2.c,v 1.9 2014/07/11 08:44:49 jsing Exp $ */
+/* $OpenBSD: x509_d2.c,v 1.10 2015/01/22 09:06:39 reyk Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -57,6 +57,7 @@
  */
 
 #include <stdio.h>
+#include <sys/uio.h>
 
 #include <openssl/crypto.h>
 #include <openssl/err.h>
@@ -106,3 +107,22 @@ X509_STORE_load_locations(X509_STORE *ctx, const char *file, const char *path)
 		return (0);
 	return (1);
 }
+
+int
+X509_STORE_load_mem(X509_STORE *ctx, void *buf, int len)
+{
+	X509_LOOKUP		*lookup;
+	struct iovec		 iov;
+
+	lookup = X509_STORE_add_lookup(ctx, X509_LOOKUP_mem());
+	if (lookup == NULL)
+		return (0);
+
+	iov.iov_base = buf;
+	iov.iov_len = len;
+
+	if (X509_LOOKUP_add_mem(lookup, &iov, X509_FILETYPE_PEM) != 1)
+		return (0);
+
+	return (1);
+}
diff --git a/lib/libcrypto/x509/x509_vfy.h b/lib/libcrypto/x509/x509_vfy.h
index 5b411ca6787..500b5204950 100644
--- a/lib/libcrypto/x509/x509_vfy.h
+++ b/lib/libcrypto/x509/x509_vfy.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: x509_vfy.h,v 1.13 2014/07/10 22:45:58 jsing Exp $ */
+/* $OpenBSD: x509_vfy.h,v 1.14 2015/01/22 09:06:39 reyk Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -286,6 +286,7 @@ void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth);
 
 #define X509_L_FILE_LOAD	1
 #define X509_L_ADD_DIR		2
+#define X509_L_MEM		3
 
 #define X509_LOOKUP_load_file(x,name,type) \
 		X509_LOOKUP_ctrl((x),X509_L_FILE_LOAD,(name),(long)(type),NULL)
@@ -293,6 +294,10 @@ void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth);
 #define X509_LOOKUP_add_dir(x,name,type) \
 		X509_LOOKUP_ctrl((x),X509_L_ADD_DIR,(name),(long)(type),NULL)
 
+#define X509_LOOKUP_add_mem(x,iov,type) \
+		X509_LOOKUP_ctrl((x),X509_L_MEM,(const char *)(iov),\
+		(long)(type),NULL)
+
 #define		X509_V_OK					0
 /* illegal error (for uninitialized values, to avoid X509_V_OK): 1 */
 
@@ -436,6 +441,7 @@ X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m);
 
 X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void);
 X509_LOOKUP_METHOD *X509_LOOKUP_file(void);
+X509_LOOKUP_METHOD *X509_LOOKUP_mem(void);
 
 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x);
 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x);
@@ -466,6 +472,7 @@ int X509_LOOKUP_shutdown(X509_LOOKUP *ctx);
 
 int	X509_STORE_load_locations (X509_STORE *ctx,
 		const char *file, const char *dir);
+int	X509_STORE_load_mem(X509_STORE *ctx, void *buf, int len);
 int	X509_STORE_set_default_paths(X509_STORE *ctx);
 
 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,