1 files changed, 123 insertions, 0 deletions
diff --git a/usr/src/lib/libsmartsshd/common/sshd-plugin.c b/usr/src/lib/libsmartsshd/common/sshd-plugin.c
new file mode 100644
index 0000000000..4f0f0bc1ad
--- /dev/null
+++ b/usr/src/lib/libsmartsshd/common/sshd-plugin.c
@@ -0,0 +1,123 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2011 Joyent, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+#include <alloca.h>
+#include <door.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <openssl/rsa.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define	LOG_OOM(SZ)	fprintf(stderr, "Unable to alloca %d bytes\n", SZ)
+
+static const char *DOOR = "/var/tmp/._joyent_sshd_key_is_authorized";
+static const char *REQ_FMT_STR = "%s %d %s"; /* name uid fp */
+static const int RETURN_SZ = 2;
+
+static const int MAX_ATTEMPTS = 2;
+static const int SLEEP_PERIOD = 1;
+
+static int
+sshd_allowed_in_capi(struct passwd *pw, const char *fp)
+{
+	int allowed = 0;
+	int fd = -1;
+	int blen = 0;
+	int attempts = 0;
+	char *buf = NULL;
+	door_arg_t door_args = {0};
+
+	if (pw == NULL || fp == NULL)
+		return (0);
+
+	blen = snprintf(NULL, 0, REQ_FMT_STR, pw->pw_name, pw->pw_uid, fp) + 1;
+
+	buf = (char *)alloca(blen);
+	if (buf == NULL) {
+		LOG_OOM(blen);
+		return (0);
+	}
+
+	(void) snprintf(buf, blen, REQ_FMT_STR, pw->pw_name, pw->pw_uid, fp);
+	door_args.data_ptr = buf;
+	door_args.data_size = blen;
+
+	door_args.rsize = RETURN_SZ;
+	door_args.rbuf = alloca(RETURN_SZ);
+	if (door_args.rbuf == NULL) {
+		LOG_OOM(RETURN_SZ);
+		return (0);
+	}
+	memset(door_args.rbuf, 0, RETURN_SZ);
+
+	do {
+		fd = open(DOOR, O_RDWR);
+		if (fd < 0)
+			perror("smartplugin: open (of door FD) failed");
+
+		if (door_call(fd, &door_args) < 0) {
+			perror("smartplugin: door_call failed");
+		} else {
+			allowed = atoi(door_args.rbuf);
+			munmap(door_args.rbuf, door_args.rsize);
+			return (allowed);
+		}
+		if (++attempts < MAX_ATTEMPTS)
+			sleep(SLEEP_PERIOD);
+	} while (attempts < MAX_ATTEMPTS);
+
+	return (0);
+}
+
+int
+sshd_user_rsa_key_allowed(struct passwd *pw, RSA *key, const char *fp)
+{
+	return sshd_allowed_in_capi(pw, fp);
+}
+
+int
+sshd_user_dsa_key_allowed(struct passwd *pw, DSA *key, const char *fp)
+{
+	return sshd_allowed_in_capi(pw, fp);
+}
+
+
+#ifdef __cplusplus
+}
+#endif