pki: Add pki_crypto.c.

src/CMakeLists.txt

@@ -114,11 +114,16 @@ set(libssh_SRCS
 )
 
 if (WITH_GCRYPT)
-  set(libssh_SRCS
-    ${libssh_SRCS}
-    libgcrypt.c
-    gcrypt_missing.c  
-  )
+    set(libssh_SRCS
+        ${libssh_SRCS}
+        libgcrypt.c
+        gcrypt_missing.c
+       )
+else (WITH_GCRYPT)
+    set(libssh_SRCS
+        ${libssh_SRCS}
+        pki_crypto.c
+       )
 endif (WITH_GCRYPT)
 
 if (WITH_SFTP)

src/pki_crypto.c

@@ -0,0 +1,69 @@
+/*
+ * pki_crypto.c - PKI infrastructure using OpenSSL
+ *
+ * This file is part of the SSH Library
+ *
+ * Copyright (c) 2003-2009 by Aris Adamantiadis
+ * Copyright (c) 2009-2011 by Andreas Schneider <asn@cryptomilk.org>
+ *
+ * The SSH Library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ *
+ * The SSH Library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the SSH Library; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef _PKI_CRYPTO_H
+#define _PKI_CRYPTO_H
+
+#include "config.h"
+
+#include <openssl/pem.h>
+#include <openssl/dsa.h>
+#include <openssl/err.h>
+#include <openssl/rsa.h>
+
+#include "libssh/priv.h"
+#include "libssh/libssh.h"
+#include "libssh/session.h"
+#include "libssh/callbacks.h"
+
+static int pem_get_password(char *buf, int size, int rwflag, void *userdata) {
+    ssh_session session = userdata;
+
+    (void) rwflag; /* unused */
+
+    if (buf == NULL) {
+        return 0;
+    }
+
+    ssh_log(session, SSH_LOG_RARE,
+            "Trying to call external authentication function");
+
+    memset(buf, '\0', size);
+    if (session &&
+        session->common.callbacks &&
+        session->common.callbacks->auth_function) {
+        int rc;
+
+        rc = session->common.callbacks->auth_function("Passphrase for private key:",
+                                                      buf, size, 0, 0,
+                                                      session->common.callbacks->userdata);
+        if (rc == 0) {
+            return strlen(buf);
+        }
+    }
+
+    return 0;
+}
+
+#endif /* _PKI_CRYPTO_H */