path: root/recipes-extended/findutils/findutils-4.2.31/findutils-selinux.patch

From: Xin Ouyang <Xin.Ouyang@windriver.com>
Date: Thu, 21 Jun 2012 17:01:39 +0800
Subject: [PATCH] findutils: support selinux.

Upstream-Status: Inappropriate [configuration]

Signed-off-by: Xin Ouyang <Xin.Ouyang@windriver.com>
---
 configure.in     |   10 +++++
 doc/find.texi    |   12 +++++++
 find/Makefile.am |    2 +-
 find/defs.h      |   15 ++++++++-
 find/find.1      |    4 ++
 find/find.c      |   97 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 find/parser.c    |   50 ++++++++++++++++++++++++++--
 find/pred.c      |   53 +++++++++++++++++++++++++++++
 find/util.c      |    3 ++
 9 files changed, 240 insertions(+), 6 deletions(-)

diff --git a/configure.in b/configure.in
index 6a20f15..00dd7f8 100644
--- a/configure.in
+++ b/configure.in
@@ -101,6 +101,16 @@ dnl C library, try -lsun.
 AC_CHECK_FUNC(getpwnam, [],
 [AC_CHECK_LIB(sun, getpwnam)])
 
+AC_ARG_WITH([selinux],
+           AS_HELP_STRING([--without-selinux], [disable SELinux support]),
+           [:],
+[AC_CHECK_LIB([selinux], [is_selinux_enabled],
+             [with_selinux=yes], [with_selinux=no])])
+if test x$with_selinux != xno; then
+   AC_DEFINE([WITH_SELINUX], [1], [Define to support SELinux])
+   AC_SUBST([LIBSELINUX], [-lselinux])
+fi
+
 dnl Checks for header files.
 AC_HEADER_STDC
 dnl Assume unistd.h is present - coreutils does too.
diff --git a/doc/find.texi b/doc/find.texi
index 5b5f0cf..e1ad433 100644
--- a/doc/find.texi
+++ b/doc/find.texi
@@ -1091,6 +1091,14 @@ will probably be made in early 2006.
 
 @end deffn
 
+@deffn Test -context pattern
+True if file's SELinux context matches the pattern @var{pattern}.
+The pattern uses shell glob matching.
+
+This predicate is supported only on @code{find} versions compiled with
+SELinux support and only when SELinux is enabled.
+@end deffn
+
 @node Contents
 @section Contents
 
@@ -1599,6 +1607,10 @@ semantics, you will see a difference between the mode as printed by
 @item %M
 File's permissions (in symbolic form, as for @code{ls}).  This
 directive is supported in findutils 4.2.5 and later.
+
+@item %Z
+File's SELinux context, or empty string if the file has no SELinux context
+or this version of find does not support SELinux.
 @end table
 
 @node Size Directives
diff --git a/find/Makefile.am b/find/Makefile.am
index 8e71a32..405955a 100644
--- a/find/Makefile.am
+++ b/find/Makefile.am
@@ -6,7 +6,7 @@ bin_PROGRAMS = find
 find_SOURCES = find.c fstype.c parser.c pred.c tree.c util.c version.c
 EXTRA_DIST = defs.h $(man_MANS)
 INCLUDES = -I../gnulib/lib -I$(top_srcdir)/lib -I$(top_srcdir)/gnulib/lib -I../intl -DLOCALEDIR=\"$(localedir)\"
-LDADD = ../lib/libfind.a ../gnulib/lib/libgnulib.a @INTLLIBS@
+LDADD = ../lib/libfind.a ../gnulib/lib/libgnulib.a @INTLLIBS@ @LIBSELINUX@
 man_MANS = find.1
 SUBDIRS = testsuite
 
diff --git a/find/defs.h b/find/defs.h
index 9369c9a..8a8cf28 100644
--- a/find/defs.h
+++ b/find/defs.h
@@ -131,6 +131,10 @@ int get_statinfo PARAMS((const char *pathname, const char *name, struct stat *p)
 #define MODE_RWX	(S_IXUSR | S_IXGRP | S_IXOTH | MODE_RW)
 #define MODE_ALL	(S_ISUID | S_ISGID | S_ISVTX | MODE_RWX)
 
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif
+
 #if 1
 #include <stdbool.h>
 typedef bool boolean;
@@ -320,6 +324,9 @@ struct predicate
     struct dir_id   fileid;	/* samefile */
     mode_t type;		/* type */
     FILE *stream;		/* ls fls fprint0 */
+#ifdef WITH_SELINUX
+    security_context_t scontext; /* scontext */
+#endif
     struct format_val printf_vec; /* printf fprintf fprint  */
   } args;
 
@@ -481,7 +488,9 @@ boolean pred_uid PARAMS((char *pathname, struct stat *stat_buf, struct predicate
 boolean pred_used PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
 boolean pred_user PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
 boolean pred_xtype PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
-
+#ifdef WITH_SELINUX
+boolean pred_context PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
+#endif
 
 
 int launch PARAMS((const struct buildcmd_control *ctl,
@@ -570,6 +579,10 @@ struct options
    * can be changed with the positional option, -regextype.
    */
   int regex_options;
+
+#ifdef WITH_SELINUX
+  int (*x_getfilecon) ();
+#endif
 };
 extern struct options options;
 
diff --git a/find/find.1 b/find/find.1
index 9be362f..2753d47 100644
--- a/find/find.1
+++ b/find/find.1
@@ -487,6 +487,8 @@ links: if the \-H or \-P option was specified, true if the file is a
 link to a file of type \fIc\fR; if the \-L option has been given, true
 if \fIc\fR is `l'.  In other words, for symbolic links, \-xtype checks
 the type of the file that \-type does not check.
+.IP "\-context \fIpattern\fR"
+(SELinux only) Security context of the file matches glob \fIpattern\fR.
 
 .SS ACTIONS
 .IP "\-delete\fR"
@@ -789,6 +791,8 @@ File's numeric user ID.
 File's type (like in ls \-l), U=unknown type (shouldn't happen)
 .IP %Y
 File's type (like %y), plus follow symlinks: L=loop, N=nonexistent
+.IP %Z
+(SELinux only) file's security context
 .PP
 A `%' character followed by any other character is discarded, but the
 other character is printed (don't rely on this, as further format
diff --git a/find/find.c b/find/find.c
index df28db6..6b3a2de 100644
--- a/find/find.c
+++ b/find/find.c
@@ -245,6 +245,92 @@ optionp_stat(const char *name, struct stat *p)
   return lstat(name, p);
 }
 
+#ifdef WITH_SELINUX
+static int
+fallback_getfilecon(const char *name, security_context_t *p, int prev_rv)
+{
+  /* Our original getfilecon() call failed.  Perhaps we can't follow a
+   * symbolic link.  If that might be the problem, lgetfilecon() the link.
+   * Otherwise, admit defeat.
+   */
+  switch (errno)
+    {
+    case ENOENT:
+    case ENOTDIR:
+#ifdef DEBUG_STAT
+      fprintf(stderr, "fallback_getfilecon(): getfilecon(%s) failed; falling back on lgetfilecon()\n", name);
+#endif
+      return lgetfilecon(name, p);
+
+    case EACCES:
+    case EIO:
+    case ELOOP:
+    case ENAMETOOLONG:
+#ifdef EOVERFLOW
+    case EOVERFLOW:	    /* EOVERFLOW is not #defined on UNICOS. */
+#endif
+    default:
+      return prev_rv;	       
+    }
+}
+
+/* optionh_getfilecon() implements the getfilecon operation when the
+ * -H option is in effect.
+ *
+ * If the item to be examined is a command-line argument, we follow
+ * symbolic links.  If the getfilecon() call fails on the command-line
+ * item, we fall back on the properties of the symbolic link.
+ *
+ * If the item to be examined is not a command-line argument, we
+ * examine the link itself.
+ */
+int
+optionh_getfilecon(const char *name, security_context_t *p)
+{
+  if (0 == state.curdepth)
+    {
+      /* This file is from the command line; deference the link (if it
+       * is a link).
+       */
+      int rv = getfilecon(name, p);
+      if (0 == rv)
+       return 0;		/* success */
+      else
+       return fallback_getfilecon(name, p, rv);
+    }
+  else
+    {
+      /* Not a file on the command line; do not derefernce the link.
+       */
+      return lgetfilecon(name, p);
+    }
+}
+
+/* optionl_getfilecon() implements the getfilecon operation when the
+ * -L option is in effect.  That option makes us examine the thing the
+ * symbolic link points to, not the symbolic link itself.
+ */
+int
+optionl_getfilecon(const char *name, security_context_t *p)
+{
+  int rv = getfilecon(name, p);
+  if (0 == rv)
+    return 0;			/* normal case. */
+  else
+    return fallback_getfilecon(name, p, rv);
+}
+
+/* optionp_getfilecon() implements the stat operation when the -P
+ * option is in effect (this is also the default).  That option makes
+ * us examine the symbolic link itself, not the thing it points to.
+ */
+int
+optionp_getfilecon(const char *name, security_context_t *p)
+{
+  return lgetfilecon(name, p);
+}
+#endif /* WITH_SELINUX */
+
 #ifdef DEBUG_STAT
 static uintmax_t stat_count = 0u;
 
@@ -272,11 +358,17 @@ set_follow_state(enum SymlinkOption opt)
     {
     case SYMLINK_ALWAYS_DEREF:  /* -L */
       options.xstat = optionl_stat;
+#ifdef WITH_SELINUX
+      options.x_getfilecon = optionl_getfilecon;
+#endif
       options.no_leaf_check = true;
       break;
       
     case SYMLINK_NEVER_DEREF:	/* -P (default) */
       options.xstat = optionp_stat;
+#ifdef WITH_SELINUX
+      options.x_getfilecon = optionp_getfilecon;
+#endif
       /* Can't turn no_leaf_check off because the user might have specified 
        * -noleaf anyway
        */
@@ -284,6 +376,9 @@ set_follow_state(enum SymlinkOption opt)
       
     case SYMLINK_DEREF_ARGSONLY: /* -H */
       options.xstat = optionh_stat;
+#ifdef WITH_SELINUX
+      options.x_getfilecon = optionh_getfilecon;
+#endif
       options.no_leaf_check = true;
     }
 
@@ -1807,7 +1902,7 @@ complete_pending_execs(struct predicate *p)
 static void
 process_dir (char *pathname, char *name, int pathlen, struct stat *statp, char *parent)
 {
-  int subdirs_left;		/* Number of unexamined subdirs in PATHNAME. */
+  int subdirs_left = 0;		/* Number of unexamined subdirs in PATHNAME. */
   boolean subdirs_unreliable;	/* if true, cannot use dir link count as subdir limif (if false, it may STILL be unreliable) */
   int idx;			/* Which entry are we on? */
   struct stat stat_buf;
diff --git a/find/parser.c b/find/parser.c
index fcdb98a..e67e09f 100644
--- a/find/parser.c
+++ b/find/parser.c
@@ -48,6 +48,10 @@
 /* We need <unistd.h> for isatty(). */
 #include <unistd.h> 
 
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif
+
 #if ENABLE_NLS
 # include <libintl.h>
 # define _(Text) gettext (Text)
@@ -148,7 +152,9 @@ static boolean parse_noignore_race PARAMS((const struct parser_table*, char *arg
 static boolean parse_warn          PARAMS((const struct parser_table*, char *argv[], int *arg_ptr));
 static boolean parse_xtype         PARAMS((const struct parser_table*, char *argv[], int *arg_ptr));
 static boolean parse_quit          PARAMS((const struct parser_table*, char *argv[], int *arg_ptr));
-
+#ifdef WITH_SELINUX
+static boolean parse_context       PARAMS((const struct parser_table*, char *argv[], int *arg_ptr));
+#endif
 
 
 boolean parse_print             PARAMS((const struct parser_table*, char *argv[], int *arg_ptr));
@@ -216,6 +222,9 @@ static struct parser_table const parse_table[] =
   PARSE_TEST       ("cmin",                  cmin),	     /* GNU */
   PARSE_TEST       ("cnewer",                cnewer),	     /* GNU */
   PARSE_TEST       ("ctime",                 ctime),
+#ifdef WITH_SELINUX
+  PARSE_TEST       ("context",               context),	     /* GNU */
+#endif
   PARSE_POSOPT     ("daystart",              daystart),	     /* GNU */
   PARSE_ACTION     ("delete",                delete), /* GNU, Mac OS, FreeBSD */
   PARSE_OPTION     ("d",                     d), /* Mac OS X, FreeBSD, NetBSD, OpenBSD, but deprecated  in favour of -depth */
@@ -801,8 +810,12 @@ tests (N can be +N or -N or N): -amin N -anewer FILE -atime N -cmin N\n\
   puts (_("\
       -nouser -nogroup -path PATTERN -perm [+-]MODE -regex PATTERN\n\
       -wholename PATTERN -size N[bcwkMG] -true -type [bcdpflsD] -uid N\n\
-      -used N -user NAME -xtype [bcdpfls]\n"));
+      -used N -user NAME -xtype [bcdpfls]"));
+#ifdef WITH_SELINUX
   puts (_("\
+      -context CONTEXT\n"));
+#endif
+  puts (_("\n\
 actions: -delete -print0 -printf FORMAT -fprintf FILE FORMAT -print \n\
       -fprint0 FILE -fprint FILE -ls -fls FILE -prune -quit\n\
       -exec COMMAND ; -exec COMMAND {} + -ok COMMAND ;\n\
@@ -1718,6 +1731,10 @@ parse_version (const struct parser_table* entry, char **argv, int *arg_ptr)
   printf("LEAF_OPTIMISATION ");
   ++features;
 #endif
+#if defined(WITH_SELINUX)
+  printf("SELINUX ");
+  ++features;
+#endif
   if (0 == features)
     {
       /* For the moment, leave this as English in case someone wants
@@ -1729,6 +1746,32 @@ parse_version (const struct parser_table* entry, char **argv, int *arg_ptr)
   exit (0);
 }
 
+#ifdef WITH_SELINUX
+static boolean
+parse_context (const struct parser_table* entry, char **argv, int *arg_ptr)
+{
+  struct predicate *our_pred;
+
+  if ((argv == NULL) || (argv[*arg_ptr] == NULL))
+    return false;
+
+  if (is_selinux_enabled() <= 0)
+    {
+      error (1, 0, _("invalid predicate -context: SELinux is not enabled."));
+      return false;
+    }
+  our_pred = insert_primary (entry);
+  our_pred->need_stat = false;
+#ifdef DEBUG
+  our_pred->p_name = find_pred_name (pred_context);
+#endif /*DEBUG*/
+  our_pred->args.scontext = argv[*arg_ptr];
+
+  (*arg_ptr)++;
+  return true;
+}
+#endif /* WITH_SELINUX */
+
 static boolean
 parse_xdev (const struct parser_table* entry, char **argv, int *arg_ptr)
 {
@@ -1971,7 +2014,7 @@ insert_fprintf (FILE *fp, const struct parser_table *entry, PRED_FUNC func, char
 	  if (*scan2 == '.')
 	    for (scan2++; ISDIGIT (*scan2); scan2++)
 	      /* Do nothing. */ ;
-	  if (strchr ("abcdDfFgGhHiklmMnpPstuUyY", *scan2))
+	  if (strchr ("abcdDfFgGhHiklmMnpPstuUyYZ", *scan2))
 	    {
 	      segmentp = make_segment (segmentp, format, scan2 - format,
 				       (int) *scan2);
@@ -2046,6 +2089,7 @@ make_segment (struct segment **segment, char *format, int len, int kind)
     case 'u':			/* user name */
     case 'y':			/* file type */
     case 'Y':			/* symlink pointed file type */
+    case 'Z':			/* SELinux security context */
       fprintf_stat_needed = true;
       /* FALLTHROUGH */
     case 'f':			/* basename of path */
diff --git a/find/pred.c b/find/pred.c
index 9ec10a4..1da49dc 100644
--- a/find/pred.c
+++ b/find/pred.c
@@ -38,6 +38,10 @@
 #include "buildcmd.h"
 #include "yesno.h"
 
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif /*WITH_SELINUX*/
+
 #if ENABLE_NLS
 # include <libintl.h>
 # define _(Text) gettext (Text)
@@ -217,6 +221,9 @@ struct pred_assoc pred_table[] =
   {pred_used, "used    "},
   {pred_user, "user    "},
   {pred_xtype, "xtype   "},
+#ifdef WITH_SELINUX
+  {pred_context, "context"},
+#endif /*WITH_SELINUX*/
   {0, "none    "}
 };
 
@@ -905,6 +912,27 @@ pred_fprintf (char *pathname, struct stat *stat_buf, struct predicate *pred_ptr)
 		     mode_to_filetype(stat_buf->st_mode & S_IFMT));
 	  }
 	  break;
+	case 'Z':               /* SELinux security context */
+#ifdef WITH_SELINUX
+	  {
+	    security_context_t scontext;
+	    int rv;
+	    rv = (*options.x_getfilecon) (state.rel_pathname, &scontext);
+
+	    if (rv < 0)
+	      {
+		fprintf (stderr, "getfilecon(%s): %s", pathname,
+			 strerror(errno));
+		fflush (stderr);
+	      }
+	    else
+	      {
+		fprintf (fp, segment->text, scontext);
+		freecon (scontext);
+	      }
+	  }
+#endif /* WITH_SELINUX */
+	  break;
 	}
     }
   return true;
@@ -1497,6 +1525,31 @@ pred_xtype (char *pathname, struct stat *stat_buf, struct predicate *pred_ptr)
    */
   return (pred_type (pathname, &sbuf, pred_ptr));
 }
+
+#ifdef WITH_SELINUX
+
+boolean
+pred_context (char *pathname, struct stat *stat_buf,
+	      struct predicate *pred_ptr)
+{
+  int rv;
+  security_context_t scontext;
+
+  rv = (*options.x_getfilecon) (state.rel_pathname, &scontext);
+
+  if (rv < 0)
+    {
+      fprintf (stderr, "getfilecon(%s): %s\n", pathname, strerror(errno));
+      fflush (stderr);
+      return false;
+    }
+
+  rv = (fnmatch (pred_ptr->args.scontext, scontext, 0) == 0);
+  freecon (scontext);
+  return rv;
+}
+
+#endif /*WITH_SELINUX*/
 
 /*  1) fork to get a child; parent remembers the child pid
     2) child execs the command requested
diff --git a/find/util.c b/find/util.c
index 97c8687..77bdfa8 100644
--- a/find/util.c
+++ b/find/util.c
@@ -78,6 +78,9 @@ get_new_pred (const struct parser_table *entry)
   last_pred->need_stat = true;
   last_pred->need_type = true;
   last_pred->args.str = NULL;
+#ifdef WITH_SELINUX
+  last_pred->args.scontext = NULL;
+#endif
   last_pred->pred_next = NULL;
   last_pred->pred_left = NULL;
   last_pred->pred_right = NULL;
-- 
1.7.5.4