Vendor import of OpenPAM Cinchona.

5 files changed, 273 insertions, 2 deletions

diff --git a/contrib/openpam/lib/Makefile b/contrib/openpam/lib/Makefile
index d9f38c3..f2fb006 100644
--- a/contrib/openpam/lib/Makefile
+++ b/contrib/openpam/lib/Makefile
@@ -31,7 +31,7 @@
 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 #
-# $P4: //depot/projects/openpam/lib/Makefile#12 $
+# $P4: //depot/projects/openpam/lib/Makefile#13 $
 #
 
 LIB		 = pam
@@ -44,12 +44,15 @@ CFLAGS		+= -I${.CURDIR}/../include
 CFLAGS		+= -DLIB_MAJ=${SHLIB_MAJOR}
 
 SRCS		 =
+SRCS		+= openpam_borrow_cred.c
 SRCS		+= openpam_dispatch.c
 SRCS		+= openpam_dynamic.c
 SRCS		+= openpam_findenv.c
+SRCS		+= openpam_free_data.c
 SRCS		+= openpam_get_option.c
 SRCS		+= openpam_load.c
 SRCS		+= openpam_log.c
+SRCS		+= openpam_restore_cred.c
 SRCS		+= openpam_set_option.c
 SRCS		+= openpam_static.c
 SRCS		+= openpam_ttyconv.c
diff --git a/contrib/openpam/lib/openpam_borrow_cred.c b/contrib/openpam/lib/openpam_borrow_cred.c
new file mode 100644
index 0000000..87aed86
--- /dev/null
+++ b/contrib/openpam/lib/openpam_borrow_cred.c
@@ -0,0 +1,105 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * NAI Labs, the Security Research Division of Network Associates, Inc.
+ * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
+ * DARPA CHATS research program.
+ *
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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.
+ *
+ * $P4: //depot/projects/openpam/lib/openpam_borrow_cred.c#1 $
+ */
+
+#include <sys/param.h>
+
+#include <pwd.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <security/pam_appl.h>
+
+#include "openpam_impl.h"
+
+/*
+ * OpenPAM extension
+ *
+ * Temporarily borrow user credentials
+ */
+
+int
+openpam_borrow_cred(pam_handle_t *pamh,
+	const struct passwd *pwd)
+{
+	struct pam_saved_cred *scred;
+	int r;
+
+	if (geteuid() != 0)
+		return (PAM_PERM_DENIED);
+	scred = calloc(1, sizeof *scred);
+	if (scred == NULL)
+		return (PAM_BUF_ERR);
+	scred->euid = geteuid();
+	scred->egid = getegid();
+	r = getgroups(NGROUPS_MAX, scred->groups);
+	if (r == -1) {
+		free(scred);
+		return (PAM_SYSTEM_ERR);
+	}
+	scred->ngroups = r;
+	r = pam_set_data(pamh, PAM_SAVED_CRED, scred, &openpam_free_data);
+	if (r != PAM_SUCCESS) {
+		free(scred);
+		return (r);
+	}
+	if (initgroups(pwd->pw_name, pwd->pw_gid) == -1 ||
+	      setegid(pwd->pw_gid) == -1 || seteuid(pwd->pw_uid) == -1) {
+		openpam_restore_cred(pamh);
+		return (PAM_SYSTEM_ERR);
+	}
+	return (PAM_SUCCESS);
+}
+
+/*
+ * Error codes:
+ *
+ *	=pam_set_data
+ *	PAM_SYSTEM_ERR
+ *	PAM_BUF_ERR
+ *	PAM_PERM_DENIED
+ */
+
+/**
+ * The =openpam_borrow_cred function saves the current credentials and
+ * switches to those of the user specified by its =pwd argument.  The
+ * affected credentials are the effective UID, the effective GID, and the
+ * group access list.  The original credentials can be restored using
+ * =openpam_restore_cred.
+ *
+ * >setegid
+ * >seteuid
+ * >setgroups
+ */
diff --git a/contrib/openpam/lib/openpam_free_data.c b/contrib/openpam/lib/openpam_free_data.c
new file mode 100644
index 0000000..6c71266
--- /dev/null
+++ b/contrib/openpam/lib/openpam_free_data.c
@@ -0,0 +1,67 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * NAI Labs, the Security Research Division of Network Associates, Inc.
+ * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
+ * DARPA CHATS research program.
+ *
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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.
+ *
+ * $P4: //depot/projects/openpam/lib/openpam_free_data.c#1 $
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <security/pam_appl.h>
+
+#include "openpam_impl.h"
+
+/*
+ * OpenPAM extension
+ *
+ * Generic cleanup function
+ */
+
+void
+openpam_free_data(pam_handle_t *pamh, void *data, int status)
+{
+	/* silence compiler warnings */
+	pamh = pamh;
+	status = status;
+	free(data);
+}
+
+/*
+ * Error codes:
+ */
+
+/**
+ * The =openpam_free_data is a cleanup function suitable for passing to
+ * =pam_set_data.  It simply releases the data by passing its =data
+ * argument to =free.
+ */
diff --git a/contrib/openpam/lib/openpam_impl.h b/contrib/openpam/lib/openpam_impl.h
index 8300b0f..a9b011e 100644
--- a/contrib/openpam/lib/openpam_impl.h
+++ b/contrib/openpam/lib/openpam_impl.h
@@ -31,7 +31,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $P4: //depot/projects/openpam/lib/openpam_impl.h#11 $
+ * $P4: //depot/projects/openpam/lib/openpam_impl.h#12 $
  */
 
 #ifndef _OPENPAM_IMPL_H_INCLUDED
@@ -93,6 +93,16 @@ struct pam_handle {
 	int		 env_size;
 };
 
+#ifdef NGROUPS_MAX
+#define PAM_SAVED_CRED "pam_saved_cred"
+struct pam_saved_cred {
+	uid_t	 euid;
+	gid_t	 egid;
+	gid_t	 groups[NGROUPS_MAX];
+	int	 ngroups;
+};
+#endif
+
 #define PAM_OTHER	"other"
 
 int		openpam_dispatch(pam_handle_t *, int, int);
diff --git a/contrib/openpam/lib/openpam_restore_cred.c b/contrib/openpam/lib/openpam_restore_cred.c
new file mode 100644
index 0000000..05c3b10
--- /dev/null
+++ b/contrib/openpam/lib/openpam_restore_cred.c
@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * NAI Labs, the Security Research Division of Network Associates, Inc.
+ * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
+ * DARPA CHATS research program.
+ *
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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.
+ *
+ * $P4: //depot/projects/openpam/lib/openpam_restore_cred.c#1 $
+ */
+
+#include <sys/param.h>
+
+#include <pwd.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <security/pam_appl.h>
+
+#include "openpam_impl.h"
+
+/*
+ * OpenPAM extension
+ *
+ * Restore credentials
+ */
+
+int
+openpam_restore_cred(pam_handle_t *pamh)
+{
+	struct pam_saved_cred *scred;
+	int r;
+
+	r = pam_get_data(pamh, PAM_SAVED_CRED, (const void **)&scred);
+	if (r != PAM_SUCCESS)
+		return (r);
+	if (scred == NULL)
+		return (PAM_SYSTEM_ERR);
+	if (seteuid(scred->euid) == -1 ||
+	    setgroups(scred->ngroups, scred->groups) == -1 ||
+	    setegid(scred->egid) == -1)
+		return (PAM_SYSTEM_ERR);
+	pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
+	return (PAM_SUCCESS);
+}
+
+/*
+ * Error codes:
+ *
+ *	=pam_get_data
+ *	PAM_SYSTEM_ERR
+ */
+
+/**
+ * The =openpam_restore_cred function restores the credentials saved by
+ * =openpam_borrow_cred.
+ *
+ * >setegid
+ * >seteuid
+ * >setgroups
+ */