From 2212fcc63960ac417f161ac6a3a29367385ad65a Mon Sep 17 00:00:00 2001 From: Kamil Dudka Date: Wed, 28 Jan 2009 15:00:34 +0100 Subject: [PATCH] Add SELinux support. * find/defs.h: Add SELinux definitions. * find/tree.c: Add -context predicate to lookup. * find/pred.c: Handle %Z printf directive. * find/parser.c: Parse -context predicate and %Z printf directive. * find/find.1: Mention -context predicate and %Z printf directive. * doc/find.texi: Mention -context predicate and %Z printf directive. * find/Makefile.am: Add SELinux libraries. * import-gnulib.config: Require gnulib module selinux-h. --- doc/find.texi | 10 ++++ find/Makefile.am | 2 +- find/defs.h | 6 +++ find/find.1 | 4 ++ find/parser.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++- find/pred.c | 38 ++++++++++++++++ find/tree.c | 4 +- import-gnulib.config | 1 + 8 files changed, 180 insertions(+), 4 deletions(-) diff --git a/doc/find.texi b/doc/find.texi index 56d3e32..242ff42 100644 --- a/doc/find.texi +++ b/doc/find.texi @@ -1242,6 +1242,14 @@ situation. @end deffn address@hidden 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. address@hidden deffn + @node Contents @section Contents @@ -1826,6 +1834,8 @@ value used for BLOCKSIZE is system-dependent, but is usually 512 bytes. If the file size is zero, the value printed is undefined. On systems which lack support for st_blocks, a file's sparseness is assumed to be 1.0. address@hidden %Z +File's SELinux context, or empty string if the file has no SELinux context. @end table @node Location Directives 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@ @LIB_SELINUX@ man_MANS = find.1 SUBDIRS = . testsuite diff --git a/find/defs.h b/find/defs.h index 1708d83..4c4e1b1 100644 --- a/find/defs.h +++ b/find/defs.h @@ -48,6 +48,7 @@ Please stop compiling the program now #include /* for bool/boolean */ #include /* for uintmax_t */ #include /* S_ISUID etc. */ +#include @@ -315,6 +316,7 @@ 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 */ + security_context_t scontext; /* scontext */ } args; /* The next predicate in the user input sequence, @@ -459,6 +461,7 @@ PREDICATEFUNCTION pred_used; PREDICATEFUNCTION pred_user; PREDICATEFUNCTION pred_writable; PREDICATEFUNCTION pred_xtype; +PREDICATEFUNCTION pred_context; @@ -601,6 +604,9 @@ struct options */ int regex_options; + /* function used to get file context */ + int (*x_getfilecon) (); + /* Optimisation level. One is the default. */ unsigned short optimisation_level; diff --git a/find/find.1 b/find/find.1 index 25953fc..52c8017 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 7f404ba..4fc43f8 100644 --- a/find/parser.c +++ b/find/parser.c @@ -53,6 +53,8 @@ #include #include +#include + #if ENABLE_NLS # include # define _(Text) gettext (Text) @@ -155,6 +157,7 @@ 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)); +static boolean parse_context PARAMS((const struct parser_table*, char *argv[], int *arg_ptr)); boolean parse_print PARAMS((const struct parser_table*, char *argv[], int *arg_ptr)); @@ -251,6 +254,7 @@ 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 */ + PARSE_TEST ("context", context), /* GNU */ 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 +351,85 @@ static struct parser_table const parse_table[] = static const char *first_nonoption_arg = NULL; static const struct parser_table *noop = NULL; +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) +{ + int rv; + if (0 == state.curdepth) + { + /* This file is from the command line; dereference the link (if it is + a link). */ + 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 dereference 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); +} void check_option_combinations(const struct predicate *p) @@ -450,11 +533,13 @@ set_follow_state(enum SymlinkOption opt) { case SYMLINK_ALWAYS_DEREF: /* -L */ options.xstat = optionl_stat; + options.x_getfilecon = optionl_getfilecon; options.no_leaf_check = true; break; case SYMLINK_NEVER_DEREF: /* -P (default) */ options.xstat = optionp_stat; + options.x_getfilecon = optionp_getfilecon; /* Can't turn no_leaf_check off because the user might have specified * -noleaf anyway */ @@ -462,6 +547,7 @@ set_follow_state(enum SymlinkOption opt) case SYMLINK_DEREF_ARGSONLY: /* -H */ options.xstat = optionh_stat; + options.x_getfilecon = optionh_getfilecon; options.no_leaf_check = true; } } @@ -1127,8 +1213,10 @@ 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]")); puts (_("\ + -context CONTEXT\n")); + 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\ @@ -2517,6 +2605,8 @@ parse_version (const struct parser_table* entry, char **argv, int *arg_ptr) printf("LEAF_OPTIMISATION "); ++features; #endif + printf ("SELINUX "); + ++features; flags = 0; if (is_fts_enabled(&flags)) @@ -2552,6 +2642,30 @@ parse_version (const struct parser_table* entry, char **argv, int *arg_ptr) } 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; +} + +static boolean parse_xdev (const struct parser_table* entry, char **argv, int *arg_ptr) { options.stay_on_filesystem = true; @@ -2802,7 +2916,7 @@ insert_fprintf (struct format_val *vec, if (*scan2 == '.') for (scan2++; ISDIGIT (*scan2); scan2++) /* Do nothing. */ ; - if (strchr ("abcdDfFgGhHiklmMnpPsStuUyY", *scan2)) + if (strchr ("abcdDfFgGhHiklmMnpPsStuUyYZ", *scan2)) { segmentp = make_segment (segmentp, format, scan2 - format, KIND_FORMAT, *scan2, 0, @@ -2929,6 +3043,7 @@ make_segment (struct segment **segment, case 'h': /* leading directories part of path */ case 'p': /* pathname */ case 'P': /* pathname with ARGV element stripped */ + case 'Z': /* SELinux security context */ *fmt++ = 's'; break; diff --git a/find/pred.c b/find/pred.c index a458803..2028807 100644 --- a/find/pred.c +++ b/find/pred.c @@ -48,6 +48,8 @@ #include "error.h" #include "verify.h" +#include + #if ENABLE_NLS # include # define _(Text) gettext (Text) @@ -230,6 +232,7 @@ struct pred_assoc pred_table[] = {pred_user, "user "}, {pred_writable, "writable "}, {pred_xtype, "xtype "}, + {pred_context, "context"}, {0, "none "} }; #endif @@ -1054,6 +1057,22 @@ do_fprintf(struct format_val *dest, mode_to_filetype(stat_buf->st_mode & S_IFMT)); } break; + case 'Z': /* SELinux security context */ + { + security_context_t scontext; + int rv = (*options.x_getfilecon) (state.rel_pathname, &scontext); + if (rv < 0) + { + error (0, errno, "getfilecon: %s", + safely_quote_err_filename (0, pathname)); + } + else + { + checked_fprintf (dest, segment->text, scontext); + freecon (scontext); + } + } + break; } /* end of KIND_FORMAT case */ break; @@ -1842,6 +1861,25 @@ pred_xtype (const char *pathname, struct stat *stat_buf, struct predicate *pred_ */ return (pred_type (pathname, &sbuf, pred_ptr)); } + + +boolean +pred_context (const char *pathname, struct stat *stat_buf, + struct predicate *pred_ptr) +{ + security_context_t scontext; + int rv = (*options.x_getfilecon) (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; +} + /* 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 7420c60..f71d829 100644 --- a/find/tree.c +++ b/find/tree.c @@ -953,7 +953,8 @@ static struct pred_cost_lookup costlookup[] = { pred_used , NeedsStatInfo }, { pred_user , NeedsStatInfo }, { pred_writable , NeedsAccessInfo }, - { pred_xtype , NeedsType } /* roughly correct unless most files are symlinks */ + { pred_xtype , NeedsType }, /* roughly correct unless most files are symlinks */ + { pred_context , NeedsNothing } }; static int pred_table_sorted = 0; @@ -1434,6 +1435,7 @@ get_new_pred (const struct parser_table *entry) last_pred->need_stat = true; last_pred->need_type = true; last_pred->args.str = NULL; + last_pred->args.scontext = NULL; last_pred->pred_next = NULL; last_pred->pred_left = NULL; last_pred->pred_right = NULL; diff --git a/import-gnulib.config b/import-gnulib.config index 71c4d66..071e4c0 100644 --- a/import-gnulib.config +++ b/import-gnulib.config @@ -68,6 +68,7 @@ realloc regex rpmatch savedir +selinux-h stat-macros stat-time stpcpy -- 1.5.4.3