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authorstevel@tonic-gate <none@none>2005-06-14 00:00:00 -0700
committerstevel@tonic-gate <none@none>2005-06-14 00:00:00 -0700
commit7c478bd95313f5f23a4c958a745db2134aa03244 (patch)
treec871e58545497667cbb4b0a4f2daf204743e1fe7 /usr/src/cmd/ssh/ssh-keysign
downloadillumos-joyent-7c478bd95313f5f23a4c958a745db2134aa03244.tar.gz
OpenSolaris Launch
Diffstat (limited to 'usr/src/cmd/ssh/ssh-keysign')
-rw-r--r--usr/src/cmd/ssh/ssh-keysign/Makefile75
-rw-r--r--usr/src/cmd/ssh/ssh-keysign/ssh-keysign.c263
2 files changed, 338 insertions, 0 deletions
diff --git a/usr/src/cmd/ssh/ssh-keysign/Makefile b/usr/src/cmd/ssh/ssh-keysign/Makefile
new file mode 100644
index 0000000000..3511d0250d
--- /dev/null
+++ b/usr/src/cmd/ssh/ssh-keysign/Makefile
@@ -0,0 +1,75 @@
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License, Version 1.0 only
+# (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 2004 Sun Microsystems, Inc. All rights reserved.
+# Use is subject to license terms.
+#
+# ident "%Z%%M% %I% %E% SMI"
+#
+# cmd/ssh/ssh-keysign/Makefile
+
+PROG= ssh-keysign
+
+DIRS= $(ROOTLIBSSH)
+
+
+OBJS = ssh-keysign.o
+SRCS = $(OBJS:.o=.c)
+
+include ../../Makefile.cmd
+include ../Makefile.ssh-common
+
+FILEMODE= 04555
+
+LDLIBS += $(SSH_COMMON_LDLIBS) -lsocket -lnsl -lz $(OPENSSL_LDFLAGS) -lcrypto
+
+DYNFLAGS += $(OPENSSL_DYNFLAGS)
+
+POFILE_DIR= ..
+
+.KEEP_STATE:
+
+.PARALLEL: $(OBJS)
+
+all: $(PROG)
+
+$(PROG): $(OBJS) ../libssh/$(MACH)/libssh.a ../libopenbsd-compat/$(MACH)/libopenbsd-compat.a
+ $(LINK.c) $(OBJS) -o $@ $(LDLIBS) $(DYNFLAGS)
+ $(POST_PROCESS)
+
+clean:
+ $(RM) -f $(OBJS) $(PROG)
+
+lint: lint_SRCS
+
+include ../Makefile.msg.targ
+include ../../Makefile.targ
+
+install: all $(DIRS) $(ROOTLIBSSHPROG) $(ROOTLIBSSH)
+
+
+$(ROOTLIBSSHPROG)/%: %
+ $(INS.file)
+
+$(DIRS):
+ $(INS.dir)
+
+#pragma ident "%Z%%M% %I% %E% SMI"
diff --git a/usr/src/cmd/ssh/ssh-keysign/ssh-keysign.c b/usr/src/cmd/ssh/ssh-keysign/ssh-keysign.c
new file mode 100644
index 0000000000..66f6fde586
--- /dev/null
+++ b/usr/src/cmd/ssh/ssh-keysign/ssh-keysign.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * Copyright (c) 2002 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "includes.h"
+RCSID("$OpenBSD: ssh-keysign.c,v 1.7 2002/07/03 14:21:05 markus Exp $");
+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+#include <unistd.h>
+
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/rsa.h>
+
+#include "log.h"
+#include "key.h"
+#include "ssh.h"
+#include "ssh2.h"
+#include "misc.h"
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "authfile.h"
+#include "msg.h"
+#include "canohost.h"
+#include "pathnames.h"
+#include "readconf.h"
+
+uid_t original_real_uid; /* XXX readconf.c needs this */
+
+#ifdef HAVE___PROGNAME
+extern char *__progname;
+#else
+#ifndef lint
+char *__progname;
+#endif /* lint */
+#endif
+
+static int
+valid_request(struct passwd *pw, char *host, Key **ret, u_char *data,
+ u_int datalen)
+{
+ Buffer b;
+ Key *key;
+ u_char *pkblob;
+ u_int blen, len;
+ char *pkalg, *p;
+ int pktype, fail;
+
+ fail = 0;
+
+ buffer_init(&b);
+ buffer_append(&b, data, datalen);
+
+ /* session id, currently limited to SHA1 (20 bytes) */
+ p = buffer_get_string(&b, &len);
+ if (len != 20)
+ fail++;
+ xfree(p);
+
+ if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
+ fail++;
+
+ /* server user */
+ buffer_skip_string(&b);
+
+ /* service */
+ p = buffer_get_string(&b, NULL);
+ if (strcmp("ssh-connection", p) != 0)
+ fail++;
+ xfree(p);
+
+ /* method */
+ p = buffer_get_string(&b, NULL);
+ if (strcmp("hostbased", p) != 0)
+ fail++;
+ xfree(p);
+
+ /* pubkey */
+ pkalg = buffer_get_string(&b, NULL);
+ pkblob = buffer_get_string(&b, &blen);
+
+ pktype = key_type_from_name(pkalg);
+ if (pktype == KEY_UNSPEC)
+ fail++;
+ else if ((key = key_from_blob(pkblob, blen)) == NULL)
+ fail++;
+ else if (key->type != pktype)
+ fail++;
+ xfree(pkalg);
+ xfree(pkblob);
+
+ /* client host name, handle trailing dot */
+ p = buffer_get_string(&b, &len);
+ debug2("valid_request: check expect chost %s got %s", host, p);
+ if (strlen(host) != len - 1)
+ fail++;
+ else if (p[len - 1] != '.')
+ fail++;
+ else if (strncasecmp(host, p, len - 1) != 0)
+ fail++;
+ xfree(p);
+
+ /* local user */
+ p = buffer_get_string(&b, NULL);
+
+ if (strcmp(pw->pw_name, p) != 0)
+ fail++;
+ xfree(p);
+
+ /* end of message */
+ if (buffer_len(&b) != 0)
+ fail++;
+
+ debug3("valid_request: fail %d", fail);
+
+ if (fail && key != NULL)
+ key_free(key);
+ else
+ *ret = key;
+
+ return (fail ? -1 : 0);
+}
+
+int
+main(int argc, char **argv)
+{
+ Buffer b;
+ Options options;
+ Key *keys[2], *key;
+ struct passwd *pw;
+ int key_fd[2], i, found, version = 2, fd;
+ u_char *signature, *data;
+ char *host;
+ u_int slen, dlen;
+ u_int32_t rnd[256];
+
+ /*
+ * Since these two open()s are all that's done here before
+ * dropping privileges with setreuid(), and since having been
+ * privileged protects ssh-keysign from core dumps and tracing,
+ * there's no need to use Least Privilege interfaces like
+ * setppriv(2).
+ */
+ key_fd[0] = open(_PATH_HOST_RSA_KEY_FILE, O_RDONLY);
+ key_fd[1] = open(_PATH_HOST_DSA_KEY_FILE, O_RDONLY);
+
+ (void) setreuid(getuid(), getuid());
+
+ (void) g11n_setlocale(LC_ALL, "");
+
+ init_rng();
+ seed_rng();
+ arc4random_stir();
+
+#ifdef DEBUG_SSH_KEYSIGN
+ log_init("ssh-keysign", SYSLOG_LEVEL_DEBUG3, SYSLOG_FACILITY_AUTH, 0);
+#endif
+
+ /* verify that ssh-keysign is enabled by the admin */
+ original_real_uid = getuid(); /* XXX readconf.c needs this */
+ initialize_options(&options);
+ (void)read_config_file(_PATH_HOST_CONFIG_FILE, "", &options);
+ fill_default_options(&options);
+ if (options.hostbased_authentication != 1)
+ fatal("Hostbased authentication not enabled in %s",
+ _PATH_HOST_CONFIG_FILE);
+
+ if (key_fd[0] == -1 && key_fd[1] == -1)
+ fatal("could not open any host key");
+
+ if ((pw = getpwuid(getuid())) == NULL)
+ fatal("getpwuid failed");
+ pw = pwcopy(pw);
+
+ SSLeay_add_all_algorithms();
+ for (i = 0; i < 256; i++)
+ rnd[i] = arc4random();
+ RAND_seed(rnd, sizeof(rnd));
+
+ found = 0;
+ for (i = 0; i < 2; i++) {
+ keys[i] = NULL;
+ if (key_fd[i] == -1)
+ continue;
+ keys[i] = key_load_private_pem(key_fd[i], KEY_UNSPEC,
+ NULL, NULL);
+ (void) close(key_fd[i]);
+ if (keys[i] != NULL && keys[i]->type == KEY_RSA) {
+ if (RSA_blinding_on(keys[i]->rsa, NULL) != 1) {
+ error("RSA_blinding_on failed");
+ key_free(keys[i]);
+ keys[i] = NULL;
+ }
+ }
+ if (keys[i] != NULL)
+ found = 1;
+ }
+ if (!found)
+ fatal("no hostkey found");
+
+ buffer_init(&b);
+ if (ssh_msg_recv(STDIN_FILENO, &b) < 0)
+ fatal("ssh_msg_recv failed");
+ if (buffer_get_char(&b) != version)
+ fatal("bad version");
+ fd = buffer_get_int(&b);
+ if ((fd == STDIN_FILENO) || (fd == STDOUT_FILENO))
+ fatal("bad fd");
+ if ((host = get_local_name(fd)) == NULL)
+ fatal("cannot get sockname for fd");
+
+ data = buffer_get_string(&b, &dlen);
+ if (valid_request(pw, host, &key, data, dlen) < 0)
+ fatal("not a valid request");
+ xfree(host);
+
+ found = 0;
+ for (i = 0; i < 2; i++) {
+ if (keys[i] != NULL &&
+ key_equal(key, keys[i])) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ fatal("no matching hostkey found");
+
+ if (key_sign(keys[i], &signature, &slen, data, dlen) != 0)
+ fatal("key_sign failed");
+ xfree(data);
+
+ /* send reply */
+ buffer_clear(&b);
+ buffer_put_string(&b, signature, slen);
+ ssh_msg_send(STDOUT_FILENO, version, &b);
+
+ return (0);
+}