New upstream version 0.99.7.1

1 files changed, 482 insertions, 0 deletions

diff --git a/Linux-PAM/modules/pam_selinux/pam_selinux.c b/Linux-PAM/modules/pam_selinux/pam_selinux.c
new file mode 100644
index 00000000..5aaec2e7
--- /dev/null
+++ b/Linux-PAM/modules/pam_selinux/pam_selinux.c
@@ -0,0 +1,482 @@
+/******************************************************************************
+ * A module for Linux-PAM that will set the default security context after login
+ * via PAM.
+ *
+ * Copyright (c) 2003 Red Hat, Inc.
+ * Written by Dan Walsh <dwalsh@redhat.com>
+ *
+ * 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, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 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.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``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 "config.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <syslog.h>
+
+#define PAM_SM_AUTH
+#define PAM_SM_SESSION
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+
+#include <selinux/selinux.h>
+#include <selinux/get_context_list.h>
+#include <selinux/flask.h>
+#include <selinux/selinux.h>
+#include <selinux/context.h>
+
+static int
+send_text (pam_handle_t *pamh, const char *text, int debug)
+{
+  if (debug)
+    pam_syslog(pamh, LOG_NOTICE, "%s", text);
+  return pam_info (pamh, "%s", text);
+}
+
+/*
+ * This function sends a message to the user and gets the response. The caller
+ * is responsible for freeing the responses.
+ */
+static int
+query_response (pam_handle_t *pamh, const char *text,
+		char **responses, int debug)
+{
+  if (debug)
+    pam_syslog(pamh, LOG_NOTICE, "%s", text);
+
+  return pam_prompt (pamh, PAM_PROMPT_ECHO_ON, responses, "%s", text);
+}
+
+static security_context_t
+select_context (pam_handle_t *pamh, security_context_t* contextlist,
+		int debug)
+{
+  char *responses;
+  char *text=calloc(PATH_MAX,1);
+
+  if (text == NULL)
+    return (security_context_t) strdup(contextlist[0]);
+
+  snprintf(text, PATH_MAX,
+	   _("Your default context is %s. \n"), contextlist[0]);
+  send_text(pamh,text,debug);
+  free(text);
+  query_response(pamh,_("Do you want to choose a different one? [n]"),
+		 &responses,debug);
+  if (responses && ((responses[0] == 'y') ||
+		    (responses[0] == 'Y')))
+    {
+      int choice=0;
+      int i;
+      const char *prompt=_("Enter number of choice: ");
+      int len=strlen(prompt);
+      char buf[PATH_MAX];
+
+      _pam_drop(responses);
+      for (i = 0; contextlist[i]; i++) {
+	len+=strlen(contextlist[i]) + 10;
+      }
+      text=calloc(len,1);
+      for (i = 0; contextlist[i]; i++) {
+	snprintf(buf, PATH_MAX,
+		 "[%d] %s\n", i+1, contextlist[i]);
+	strncat(text,buf,len);
+      }
+      strcat(text,prompt);
+      while ((choice < 1) || (choice > i)) {
+	query_response(pamh,text,&responses,debug);
+	choice = strtol (responses, NULL, 10);
+	_pam_drop(responses);
+      }
+      free(text);
+      return (security_context_t) strdup(contextlist[choice-1]);
+    }
+  else if (responses)
+    _pam_drop(responses);
+
+  return (security_context_t) strdup(contextlist[0]);
+}
+
+static security_context_t
+manual_context (pam_handle_t *pamh, const char *user, int debug)
+{
+  security_context_t newcon;
+  context_t new_context;
+  int mls_enabled = is_selinux_mls_enabled();
+
+  char *responses;
+
+  while (1) {
+    query_response(pamh,
+		   _("Would you like to enter a security context? [y] "),
+		   &responses,debug);
+    if ((responses[0] == 'y') || (responses[0] == 'Y') ||
+	(responses[0] == '\0') )
+      {
+	if (mls_enabled)
+	  new_context = context_new ("user:role:type:level");
+	else
+	  new_context = context_new ("user:role:type");
+	_pam_drop(responses);
+
+	/* Allow the user to enter each field of the context individually */
+	if (context_user_set (new_context, user))
+	  {
+	    context_free (new_context);
+	    return NULL;
+	  }
+	query_response(pamh,_("role: "),&responses,debug);
+	if (context_role_set (new_context, responses))
+	  {
+	    _pam_drop(responses);
+	    context_free (new_context);
+	    return NULL;
+	  }
+	_pam_drop(responses);
+	query_response(pamh,_("type: "),&responses,debug);
+	if (context_type_set (new_context, responses))
+	  {
+	    _pam_drop(responses);
+	    context_free (new_context);
+	    return NULL;
+	  }
+	_pam_drop(responses);
+	if (mls_enabled)
+	  {
+	    query_response(pamh,_("level: "),&responses,debug);
+	    if (context_range_set (new_context, responses))
+	      {
+		_pam_drop(responses);
+		context_free (new_context);
+		return NULL;
+	      }
+	    _pam_drop(responses);
+	  }
+	/* Get the string value of the context and see if it is valid. */
+	if (!security_check_context(context_str(new_context))) {
+	  newcon = strdup(context_str(new_context));
+	  context_free (new_context);
+	  return newcon;
+	}
+	else
+	  send_text(pamh,_("Not a valid security context"),debug);
+      }
+    else {
+      _pam_drop(responses);
+      return NULL;
+    }
+  } /* end while */
+
+  return NULL;
+}
+
+static void
+security_restorelabel_tty(const pam_handle_t *pamh,
+			  const char *tty, security_context_t context)
+{
+  char ttybuf[PATH_MAX];
+  const char *ptr;
+
+  if (context==NULL)
+    return;
+
+  if(strncmp("/dev/", tty, 5)) {
+    snprintf(ttybuf,sizeof(ttybuf),"/dev/%s",tty);
+    ptr = ttybuf;
+  }
+  else
+    ptr = tty;
+
+  if (setfilecon(ptr, context) && errno != ENOENT)
+  {
+    pam_syslog(pamh, LOG_NOTICE,
+	       "Warning!  Could not relabel %s with %s, not relabeling: %m",
+	       ptr, context);
+  }
+}
+
+static security_context_t
+security_label_tty(pam_handle_t *pamh, char *tty,
+		   security_context_t usercon)
+{
+  char ttybuf[PATH_MAX];
+  int status=0;
+  security_context_t newdev_context=NULL; /* The new context of a device */
+  security_context_t prev_context=NULL; /* The new context of a device */
+  const char *ptr;
+
+  if(strncmp("/dev/", tty, 5))
+  {
+    snprintf(ttybuf,sizeof(ttybuf),"/dev/%s",tty);
+    ptr = ttybuf;
+  }
+  else
+    ptr = tty;
+
+  if (getfilecon(ptr, &prev_context) < 0)
+  {
+    if(errno != ENOENT)
+      pam_syslog(pamh, LOG_NOTICE,
+	     "Warning!  Could not get current context for %s, not relabeling: %m",
+	     ptr);
+    return NULL;
+  }
+  if( security_compute_relabel(usercon,prev_context,SECCLASS_CHR_FILE,
+                               &newdev_context)!=0)
+  {
+    pam_syslog(pamh, LOG_NOTICE,
+           "Warning!  Could not get new context for %s, not relabeling: %m",
+           ptr);
+    pam_syslog(pamh, LOG_NOTICE,
+	       "usercon=%s, prev_context=%s", usercon, prev_context);
+    freecon(prev_context);
+    return NULL;
+  }
+  status=setfilecon(ptr,newdev_context);
+  if (status)
+  {
+      pam_syslog(pamh, LOG_NOTICE,
+		 "Warning!  Could not relabel %s with %s, not relabeling: %m",
+		 ptr,newdev_context);
+      freecon(prev_context);
+      prev_context=NULL;
+  }
+  freecon(newdev_context);
+  return prev_context;
+}
+
+static security_context_t user_context=NULL;
+static security_context_t prev_user_context=NULL;
+static security_context_t ttyn_context=NULL;  /* The current context of ttyn device */
+static int selinux_enabled=0;
+static char *ttyn=NULL;
+
+/* Tell the user that access has been granted. */
+static void
+verbose_message(pam_handle_t *pamh, char *msg, int debug)
+{
+  if (debug)
+    pam_syslog(pamh, LOG_NOTICE, msg);
+
+  pam_info (pamh, "%s", msg);
+}
+
+PAM_EXTERN int
+pam_sm_authenticate(pam_handle_t *pamh UNUSED, int flags UNUSED,
+		    int argc UNUSED, const char **argv UNUSED)
+{
+	/* Fail by default. */
+	return PAM_AUTH_ERR;
+}
+
+PAM_EXTERN int
+pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED,
+	       int argc UNUSED, const char **argv UNUSED)
+{
+	return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED,
+		    int argc, const char **argv)
+{
+  int i, debug = 0, ttys=1, has_tty=isatty(0);
+  int verbose=0, multiple=0, close_session=0;
+  int ret = 0;
+  security_context_t* contextlist = NULL;
+  int num_contexts = 0;
+  const void *username = NULL;
+  const void *tty = NULL;
+
+  /* Parse arguments. */
+  for (i = 0; i < argc; i++) {
+    if (strcmp(argv[i], "debug") == 0) {
+      debug = 1;
+    }
+    if (strcmp(argv[i], "nottys") == 0) {
+      ttys = 0;
+    }
+    if (strcmp(argv[i], "verbose") == 0) {
+      verbose = 1;
+    }
+    if (strcmp(argv[i], "multiple") == 0) {
+      multiple = 1;
+    }
+    if (strcmp(argv[i], "close") == 0) {
+      close_session = 1;
+    }
+  }
+
+  if (debug)
+    pam_syslog(pamh, LOG_NOTICE, "Open Session");
+
+  /* this module is only supposed to execute close_session */
+  if (close_session)
+      return PAM_SUCCESS;
+
+  if (!(selinux_enabled = is_selinux_enabled()>0) )
+      return PAM_SUCCESS;
+
+  if (pam_get_item(pamh, PAM_USER, &username) != PAM_SUCCESS ||
+                   username == NULL) {
+    return PAM_USER_UNKNOWN;
+  }
+  num_contexts = get_ordered_context_list(username, 0, &contextlist);
+  if (num_contexts > 0) {
+    if (multiple && (num_contexts > 1) && has_tty) {
+      user_context = select_context(pamh,contextlist, debug);
+      freeconary(contextlist);
+    } else {
+      user_context = (security_context_t) strdup(contextlist[0]);
+      freeconary(contextlist);
+    }
+  } else {
+    if (has_tty) {
+      user_context = manual_context(pamh,username,debug);
+      if (user_context == NULL) {
+	pam_syslog (pamh, LOG_ERR, "Unable to get valid context for %s",
+		    (const char *)username);
+	return PAM_AUTH_ERR;
+      }
+    } else {
+        pam_syslog (pamh, LOG_ERR,
+		    "Unable to get valid context for %s, No valid tty",
+		    (const char *)username);
+	return PAM_AUTH_ERR;
+    }
+  }
+  if (getexeccon(&prev_user_context)<0) {
+    prev_user_context=NULL;
+  }
+  if (ttys) {
+    /* Get the name of the terminal. */
+    if (pam_get_item(pamh, PAM_TTY, &tty) != PAM_SUCCESS) {
+      tty = NULL;
+    }
+
+    if ((tty == NULL) || (strlen(tty) == 0) ||
+	strcmp(tty, "ssh") == 0 || strncmp(tty, "NODEV", 5) == 0) {
+      tty = ttyname(STDIN_FILENO);
+      if ((tty == NULL) || (strlen(tty) == 0)) {
+	tty = ttyname(STDOUT_FILENO);
+      }
+      if ((tty == NULL) || (strlen(tty) == 0)) {
+	tty = ttyname(STDERR_FILENO);
+      }
+    }
+  }
+  if(ttys && tty ) {
+    ttyn=strdup(tty);
+    ttyn_context=security_label_tty(pamh,ttyn,user_context);
+  }
+  ret = setexeccon(user_context);
+  if (ret==0 && verbose) {
+    char msg[PATH_MAX];
+    snprintf(msg, sizeof(msg),
+	     _("Security Context %s Assigned"), user_context);
+    verbose_message(pamh, msg, debug);
+  }
+  if (ret) {
+    pam_syslog(pamh, LOG_ERR,
+	       "Error!  Unable to set %s executable context %s.",
+	       (const char *)username, user_context);
+    freecon(user_context);
+    return PAM_AUTH_ERR;
+  } else {
+    if (debug)
+      pam_syslog(pamh, LOG_NOTICE, "set %s security context to %s",
+		 (const char *)username, user_context);
+  }
+  freecon(user_context);
+
+  return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED,
+		     int argc, const char **argv)
+{
+  int i, debug = 0,status=0, open_session=0;
+  if (! (selinux_enabled ))
+      return PAM_SUCCESS;
+
+  /* Parse arguments. */
+  for (i = 0; i < argc; i++) {
+    if (strcmp(argv[i], "debug") == 0) {
+      debug = 1;
+    }
+    if (strcmp(argv[i], "open") == 0) {
+      open_session = 1;
+    }
+  }
+
+  if (debug)
+    pam_syslog(pamh, LOG_NOTICE, "Close Session");
+
+  if (open_session)
+    return PAM_SUCCESS;
+
+  if (ttyn) {
+    if (debug)
+      pam_syslog(pamh, LOG_NOTICE, "Restore tty  %s -> %s",
+		 ttyn,ttyn_context);
+
+    security_restorelabel_tty(pamh,ttyn,ttyn_context);
+    freecon(ttyn_context);
+    free(ttyn);
+    ttyn=NULL;
+  }
+  status=setexeccon(prev_user_context);
+  freecon(prev_user_context);
+  if (status) {
+    pam_syslog(pamh, LOG_ERR, "Error!  Unable to set executable context %s.",
+	       prev_user_context);
+    return PAM_AUTH_ERR;
+  }
+
+  if (debug)
+    pam_syslog(pamh, LOG_NOTICE, "setcontext back to orginal");
+
+  return PAM_SUCCESS;
+}