Subject: [PATCH] findutils: support selinux Upstream-Status: Backport This is modified from a F13'sx SRPM patch, with conditional selinux support. Signed-off-by: Xin Ouyang --- configure.ac | 11 ++++ doc/find.texi | 18 ++++++- find/Makefile.am | 2 +- find/defs.h | 14 +++++ find/find.1 | 4 ++ find/parser.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++++++++- find/pred.c | 54 +++++++++++++++++++ find/tree.c | 6 +++ 8 files changed, 261 insertions(+), 3 deletions(-) diff --git a/configure.ac b/configure.ac index f4849b3..2dd3b13 100644 --- a/configure.ac +++ b/configure.ac @@ -114,6 +114,17 @@ AC_CHECK_LIB([m],[fabs],[FINDLIBS="-lm $FINDLIBS"] AC_DEFINE_UNQUOTED(HAVE_FABS_IN_LIBM,1,[fabs is defined in -lm])) AC_SUBST([FINDLIBS]) +AC_ARG_WITH([selinux], + AS_HELP_STRING([--without-selinux], [disable SELinux support]), + [:], + [AC_CHECK_LIB([selinux], [is_selinux_enabled], [with_selinux=yes], [with_selinux=no])]) +if test x$with_selinux = xyes; then + AC_DEFINE([WITH_SELINUX], [1], [Define to support SELinux]) + AC_SUBST([LIBSELINUX], [-lselinux]) +else + AC_SUBST([LIBSELINUX], [ ]) +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 391ffa0..f599bbc 100644 --- a/doc/find.texi +++ b/doc/find.texi @@ -7,7 +7,6 @@ @c %**end of header @include version.texi -@include ../locate/dblocation.texi @iftex @finalout @@ -1242,6 +1241,14 @@ situation. @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 @@ -1733,6 +1740,7 @@ from the novel you are reading. * Size Directives:: * Location Directives:: * Time Directives:: +* Other Directives:: @end menu @node Name Directives @@ -1890,6 +1898,14 @@ File's last modification time in the format specified by @var{k} (@pxref{Time Formats}). @end table +@node Other Directives +@subsubsection Other Directives + +@table @code +@item %Z +File's SELinux context, or empty string if the file has no SELinux context. +@end table + @node Time Formats @subsection Time Formats diff --git a/find/Makefile.am b/find/Makefile.am index b001509..6fc7df3 100644 --- a/find/Makefile.am +++ b/find/Makefile.am @@ -26,7 +26,7 @@ endif EXTRA_DIST = defs.h $(man_MANS) INCLUDES = -I../gnulib/lib -I$(top_srcdir)/lib -I$(top_srcdir)/gnulib/lib -I../intl -DLOCALEDIR=\"$(localedir)\" -LDADD = ./libfindtools.a ../lib/libfind.a ../gnulib/lib/libgnulib.a @INTLLIBS@ @LIB_CLOCK_GETTIME@ @FINDLIBS@ +LDADD = ./libfindtools.a ../lib/libfind.a ../gnulib/lib/libgnulib.a @INTLLIBS@ @LIB_CLOCK_GETTIME@ @FINDLIBS@ @LIBSELINUX@ man_MANS = find.1 SUBDIRS = . testsuite diff --git a/find/defs.h b/find/defs.h index 4539fd9..4f3b168 100644 --- a/find/defs.h +++ b/find/defs.h @@ -48,6 +48,9 @@ Please stop compiling the program now #include /* for bool/boolean */ #include /* for uintmax_t */ #include /* S_ISUID etc. */ +#ifdef WITH_SELINUX +#include +#endif @@ -315,6 +318,9 @@ struct predicate struct samefile_file_id samefileid; /* samefile */ mode_t type; /* type */ struct format_val printf_vec; /* printf fprintf fprint ls fls print0 fprint0 print */ +#ifdef WITH_SELINUX + security_context_t scontext; /* security context */ +#endif } args; /* The next predicate in the user input sequence, @@ -459,6 +465,9 @@ PREDICATEFUNCTION pred_used; PREDICATEFUNCTION pred_user; PREDICATEFUNCTION pred_writable; PREDICATEFUNCTION pred_xtype; +#ifdef WITH_SELINUX +PREDICATEFUNCTION pred_context; +#endif @@ -604,6 +613,11 @@ struct options */ int regex_options; +#ifdef WITH_SELINUX + /* function used to get file context */ + int (*x_getfilecon) (int, const char *, security_context_t *); +#endif + /* Optimisation level. One is the default. */ unsigned short optimisation_level; diff --git a/find/find.1 b/find/find.1 index 8b67ae3..1d23b17 100644 --- a/find/find.1 +++ b/find/find.1 @@ -933,6 +933,8 @@ if \fIc\fR is `l'. In other words, for symbolic links, checks the type of the file that .B \-type does not check. +.IP "\-context \fIpattern\fR" +(SELinux only) Security context of the file matches glob \fIpattern\fR. .SS ACTIONS .IP "\-delete\fR" @@ -1354,6 +1356,8 @@ File's type (like in 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/parser.c b/find/parser.c index 08758ee..02f9067 100644 --- a/find/parser.c +++ b/find/parser.c @@ -53,6 +53,10 @@ #include #include +#ifdef WITH_SELINUX +#include "selinux-at.h" +#endif + #if ENABLE_NLS # include # define _(Text) gettext (Text) @@ -155,6 +159,9 @@ 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)); @@ -251,6 +258,9 @@ static struct parser_table const parse_table[] = PARSE_TEST ("cmin", cmin), /* GNU */ PARSE_TEST ("cnewer", cnewer), /* GNU */ {ARG_TEST, "ctime", parse_time, pred_ctime}, /* POSIX */ +#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 */ @@ -347,6 +357,89 @@ static struct parser_table const parse_table[] = static const char *first_nonoption_arg = NULL; static const struct parser_table *noop = NULL; +#ifdef WITH_SELINUX +static int +fallback_getfilecon (int fd, 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 lgetfileconat (fd, 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 (int fd, const char *name, security_context_t *p) +{ + int rv; + if (0 == state.curdepth) + { + /* This file is from the command line; dereference the link (if it is + a link). */ + rv = getfileconat (fd, name, p); + if (0 == rv) + return 0; /* success */ + else + return fallback_getfilecon (fd, name, p, rv); + } + else + { + /* Not a file on the command line; do not dereference the link. */ + return lgetfileconat (fd, 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 (int fd, const char *name, security_context_t *p) +{ + int rv = getfileconat (fd, name, p); + if (0 == rv) + return 0; /* normal case. */ + else + return fallback_getfilecon (fd, 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 (int fd, const char *name, security_context_t *p) +{ + return lgetfileconat (fd, name, p); +} + +#endif void check_option_combinations(const struct predicate *p) @@ -450,11 +543,17 @@ 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 */ @@ -462,6 +561,9 @@ 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; } } @@ -1146,8 +1248,14 @@ tests (N can be +N or -N or N): -amin N -anewer FILE -atime N -cmin N\n\ -nouser -nogroup -path PATTERN -perm [+-]MODE -regex PATTERN\n\ -readable -writable -executable\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")); +#else + puts (_("\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\ @@ -2574,6 +2682,13 @@ parse_version (const struct parser_table* entry, char **argv, int *arg_ptr) printf("LEAF_OPTIMISATION "); ++features; #endif +#ifdef WITH_SELINUX + if (0 < is_selinux_enabled ()) + { + printf ("SELINUX "); + ++features; + } +#endif flags = 0; if (is_fts_enabled(&flags)) @@ -2608,6 +2723,33 @@ 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, NULL); + our_pred->est_success_rate = 0.01f; + 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 + static boolean parse_xdev (const struct parser_table* entry, char **argv, int *arg_ptr) { @@ -2861,7 +3003,11 @@ insert_fprintf (struct format_val *vec, if (*scan2 == '.') for (scan2++; ISDIGIT (*scan2); scan2++) /* Do nothing. */ ; +#ifdef WITH_SELINUX + if (strchr ("abcdDfFgGhHiklmMnpPsStuUyYZ", *scan2)) +#else if (strchr ("abcdDfFgGhHiklmMnpPsStuUyY", *scan2)) +#endif { segmentp = make_segment (segmentp, format, scan2 - format, KIND_FORMAT, *scan2, 0, @@ -2991,6 +3137,13 @@ make_segment (struct segment **segment, *fmt++ = 's'; break; +#ifdef WITH_SELINUX + case 'Z': /* SELinux security context */ + mycost = NeedsAccessInfo; + *fmt++ = 's'; + break; +#endif + case 'H': /* ARGV element file was found under */ *fmt++ = 's'; break; diff --git a/find/pred.c b/find/pred.c index b1f48a0..43cfd19 100644 --- a/find/pred.c +++ b/find/pred.c @@ -48,6 +48,10 @@ #include "error.h" #include "verify.h" +#ifdef WITH_SELINUX +#include +#endif + #if ENABLE_NLS # include # define _(Text) gettext (Text) @@ -230,6 +234,9 @@ struct pred_assoc pred_table[] = {pred_user, "user "}, {pred_writable, "writable "}, {pred_xtype, "xtype "}, +#ifdef WITH_SELINUX + {pred_context, "context"}, +#endif {0, "none "} }; #endif @@ -1054,6 +1061,32 @@ do_fprintf(struct format_val *dest, mode_to_filetype(stat_buf->st_mode & S_IFMT)); } break; + +#ifdef WITH_SELINUX + case 'Z': /* SELinux security context */ + { + security_context_t scontext; + int rv = (*options.x_getfilecon) (state.cwd_dir_fd, state.rel_pathname, + &scontext); + if (rv < 0) + { + /* If getfilecon fails, there will in the general case + still be some text to print. We just make %Z expand + to an empty string. */ + checked_fprintf (dest, segment->text, ""); + + error (0, errno, "getfilecon: %s", + safely_quote_err_filename (0, pathname)); + state.exit_status = 1; + } + else + { + checked_fprintf (dest, segment->text, scontext); + freecon (scontext); + } + } + break; +#endif } /* end of KIND_FORMAT case */ break; @@ -1844,6 +1877,27 @@ pred_xtype (const char *pathname, struct stat *stat_buf, struct predicate *pred_ */ return (pred_type (pathname, &sbuf, pred_ptr)); } + +#ifdef WITH_SELINUX +boolean +pred_context (const char *pathname, struct stat *stat_buf, + struct predicate *pred_ptr) +{ + security_context_t scontext; + int rv = (*options.x_getfilecon) (state.cwd_dir_fd, state.rel_pathname, + &scontext); + if (rv < 0) + { + error (0, errno, "getfilecon: %s", safely_quote_err_filename (0, pathname)); + return false; + } + + rv = (fnmatch (pred_ptr->args.scontext, scontext, 0) == 0); + freecon (scontext); + return rv; +} +#endif + /* 1) fork to get a child; parent remembers the child pid 2) child execs the command requested diff --git a/find/tree.c b/find/tree.c index 60a0601..6d48c09 100644 --- a/find/tree.c +++ b/find/tree.c @@ -909,6 +909,9 @@ static struct pred_cost_lookup costlookup[] = { pred_cmin , NeedsStatInfo, }, { pred_cnewer , NeedsStatInfo, }, { pred_comma , NeedsNothing, }, +#ifdef WITH_SELINUX + { pred_context , NeedsAccessInfo }, +#endif { pred_ctime , NeedsStatInfo, }, { pred_delete , NeedsSyncDiskHit }, { pred_empty , NeedsStatInfo }, @@ -1453,6 +1456,9 @@ get_new_pred (const struct parser_table *entry) last_pred->p_cost = NeedsUnknown; last_pred->arg_text = "ThisShouldBeSetToSomethingElse"; 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; -- 1.7.9.6