3 * $Id: bcquery.c,v 1.5 2003/11/29 23:39:16 mdw Exp $
5 * Query and dump Become's configuration file
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of `become'
14 * `Become' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `Become' is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `become'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.5 2003/11/29 23:39:16 mdw
35 * Revision 1.4 2003/10/12 00:14:55 mdw
36 * Major overhaul. Now uses DSA signatures rather than the bogus symmetric
37 * encrypt-and-hope thing. Integrated with mLib and Catacomb.
39 * Revision 1.3 1999/05/04 16:17:11 mdw
40 * Change to header file name for parser. See log for `parse.h' for
43 * Revision 1.2 1998/06/26 10:32:31 mdw
44 * Cosmetic change: use sizeof(destination) in memcpy.
46 * Revision 1.1 1998/04/23 13:20:20 mdw
47 * Added new program to verify and query Become configuration files.
51 /*----- Header files ------------------------------------------------------*/
53 /* --- ANSI headers --- */
63 /* --- Unix headers --- */
65 #include <sys/types.h>
67 #include <sys/socket.h>
68 #include <sys/utsname.h>
70 #include <netinet/in.h>
72 #include <arpa/inet.h>
80 /* --- mLib headers --- */
82 #include <mLib/alloc.h>
83 #include <mLib/mdwopt.h>
84 #include <mLib/quis.h>
85 #include <mLib/report.h>
88 /* --- Local headers --- */
101 /*----- Type definitions --------------------------------------------------*/
113 typedef struct qnode {
127 #define q_right q.q.r
131 /*----- Static variables --------------------------------------------------*/
148 static unsigned flags;
149 static const char *cf = file_RULES;
150 static unsigned outmask = cat_where | cat_from | cat_to | cat_what;
152 /*----- Low-level options handling ----------------------------------------*/
154 /* --- @optname@ --- *
158 * Returns: Pointer to a string describing the current option.
160 * Use: Creates a textual description of an option for use in
164 static const char *optname(void)
168 case 'H': return ("-host");
169 case 'F': return ("-from");
170 case 'T': return ("-to");
171 case 'C': return ("-command");
172 case 0: return (optarg);
173 case '(': case ')': case '&': case '|': case '!':
177 case EOF: return ("<eof>");
178 default: return ("<unknown>");
182 /* --- @nextopt@ --- *
186 * Returns: Next option id, or @EOF@.
188 * Use: Reads the next option. Does a lot of the messy work of
192 static int nextopt(void)
194 const static struct option opts[] = {
195 { "help", 0, 0, 'h' },
197 { "file", gFlag_argReq, 0, 'f' },
198 { "dump", 0, 0, 'd' },
199 { "check", 0, 0, 'k' },
201 { "output", gFlag_argReq, 0, 'o' },
202 { "columns", 0, 0, '|' },
203 { "rows", 0, 0, '-' },
204 { "nohead", 0, 0, 'n' },
206 { "host", gFlag_argReq, 0, 'H' },
207 { "from", gFlag_argReq, 0, 'F' },
208 { "to", gFlag_argReq, 0, 'T' },
209 { "command", gFlag_argReq, 0, 'C' },
211 { "and", 0, 0, '&' },
213 { "not", 0, 0, '!' },
219 opt = mdwopt(ac, av, "-", opts, 0, 0, gFlag_noShorts);
224 "Usage: %s [-help]\n"
225 " %s [-output COLS] [-dump] [-file FILE] [EXPR | -check]\n"
227 "Reads the `become' configuration file FILE (or " file_RULES " by\n"
228 "default) and writes the rules which match the EXPR.\n"
230 "EXPR may make use of the following operators: `-host HOST', `-from USER',\n"
231 "`-to USER', and `-command CMD'. You may join them together with `-and',\n"
232 "`-or' and `-not' operators (which may be spelled `&', `|' and `!' if you\n"
233 "prefer), and group subexpressions with parentheses `(' and `)'.\n",
256 enum { m_replace, m_add, m_remove } mode = m_replace;
280 die(1, "unknown column specifier `%c'", *p);
283 if (mode == m_replace) {
289 else if (mode == m_remove)
292 die(1, "bad mode while setting output mask: %u", mode);
300 die(1, "type `%s --help' for usage information", quis());
302 if (optarg[0] && optarg[1] == 0) switch (optarg[0]) {
304 case '&': case '|': case '!':
309 die(1, "unexpected text `%s' found", optarg);
316 /*----- Recursive descent query parser ------------------------------------*/
318 /* --- @qparse@ --- *
322 * Returns: A pointer to the finished tree.
324 * Use: Scans the command line arguments and makes them into a tree.
327 static qnode *qparse_expr(void);
329 static qnode *qparse_atom(void)
337 die(1, "syntax error: expected `)', found `%s'", optname());
343 qnode *q = xmalloc(sizeof(*q));
344 h = gethostbyname(optarg);
346 die(1, "unknown host `%s'", optarg);
347 q->q_cat = cat_where;
348 memcpy(&q->q_in, h->h_addr, sizeof(q->q_in));
352 case 'F': case 'T': {
353 qnode *q = xmalloc(sizeof(*q));
354 q->q_cat = (opt == 'F' ? cat_from : cat_to);
355 if (isdigit((unsigned char)optarg[0]))
356 q->q_uid = atoi(optarg);
359 if (!(flags & f_userdb)) {
365 pw = userdb_userByName(optarg);
367 die(1, "unknown user `%s'", optarg);
368 q->q_uid = pw->pw_uid;
374 qnode *q = xmalloc(sizeof(*q));
381 die(1, "unexpected token: `%s'", optname());
386 static qnode *qparse_factor(void)
389 qnode *q = xmalloc(sizeof(*q));
392 q->q_arg = qparse_atom();
395 return (qparse_atom());
398 static qnode *qparse_term(void)
400 qnode *top, *q, **qq;
408 case 'H': case 'F': case 'T': case 'C': case '!': case '(':
409 *qq = xmalloc(sizeof(*q));
410 (*qq)->q_cat = cat_and;
412 qq = &(*qq)->q_right;
421 static qnode *qparse_expr(void)
423 qnode *top, *q, **qq;
431 *qq = xmalloc(sizeof(*q));
432 (*qq)->q_cat = cat_or;
434 qq = &(*qq)->q_right;
443 static qnode *qparse(void)
451 die(1, "syntax error: `%s' unexpected", optname());
455 /* --- @dumptree@ --- *
457 * Arguments: @qnode *q@ = pointer to tree to dump
458 * @int indent@ = indentation for this subtree
462 * Use: Dumps a tree to stdout for debugging purposes.
465 static void dumptree(qnode *q, int indent)
468 printf("<empty> -- magic query which matches everything\n");
473 printf("%*s", indent * 2, "");
477 printf("host = %s\n", inet_ntoa(q->q_in));
480 printf("from = %u\n", (unsigned)q->q_uid);
483 printf("to = %u\n", (unsigned)q->q_uid);
486 printf("command = `%s'\n", q->q_cmd);
494 unsigned cat = q->q_cat;
495 printf(cat == cat_and ? "and\n" : "or\n");
496 while (q->q_cat == cat) {
497 dumptree(q->q_left, indent);
503 printf("unknown type %u\n", q->q_cat);
507 /*----- Recursive query matching ------------------------------------------*/
509 /* --- @checkrule@ --- *
511 * Arguments: @rule *r@ = pointer to a rule
512 * @qnode *q@ = pointer to a query tree
514 * Returns: Nonzero if the query matches the rule.
516 * Use: Matches rules and queries.
519 static int checkrule(rule *r, qnode *q)
524 /* --- Handle the compound query types --- */
527 return (!checkrule(r, q->q_arg));
530 if (!checkrule(r, q->q_left))
536 if (checkrule(r, q->q_left))
541 /* --- And now the simple query types --- */
544 return (class_matchHost(r->host, q->q_in));
546 return (class_matchUser(r->from, q->q_uid));
548 return (class_matchUser(r->to, q->q_uid));
550 return (class_matchCommand(r->cmd, q->q_cmd));
553 /* --- Anything else is bogus (and a bug) --- */
555 die(1, "unexpected cat code %u in checkrule", q->q_cat);
559 /*----- Rule output -------------------------------------------------------*/
561 /* --- @showrule@ --- *
563 * Arguments: @rule *r@ = pointer to a rule block
567 * Use: Writes a rule block to the output in a pleasant way.
570 static const char *xltuser(uid_t u)
573 struct passwd *pw = userdb_userById(u);
575 return (pw->pw_name);
576 sprintf(buf, "%u", (unsigned)u);
580 static void classfirstrow(class_node *c, const char *fmt, sym_iter *i,
581 unsigned bit, unsigned *imask)
583 switch (c->type & clNode_mask) {
585 printf(fmt, (c == class_all ? "ALL" :
586 c == class_none ? "NONE" :
590 printf(fmt, (c->type & clType_user) ? xltuser(c->v.u) : c->v.s);
594 sym_mkiter(i, &c->v.t);
599 } else if (c->type & clType_user)
600 printf(fmt, xltuser(*(uid_t *)b->name));
602 printf(fmt, b->name);
606 printf(fmt, "<complex>");
611 static void showclass(class_node *c,
612 void (*sc)(class_node *c),
613 void (*sh)(sym_base *b))
618 switch (c->type & clNode_mask) {
620 fputs(c == class_all ? "ALL" :
621 c == class_none ? "NONE" : "<buggy>",
630 sym_mkiter(&i, &c->v.t);
632 if ((b = sym_next(&i)) != 0) {
634 while ((b = sym_next(&i)) != 0) {
651 fputs("<unknown node type>", stdout);
654 type = c->type & clNode_mask;
657 showclass(c->v.c.l, sc, sh);
660 } while ((c->type & clNode_mask) == type);
661 showclass(c, sc, sh);
667 static void showuseri(class_node *c) { fputs(xltuser(c->v.u), stdout); }
669 static void showuserh(sym_base *b)
671 fputs(xltuser(*(uid_t *)b->name), stdout);
674 static void showstringi(class_node *c) { fputs(c->v.s, stdout); }
676 static void showstringh(sym_base *b) { fputs(b->name, stdout); }
678 static void showrule(rule *r)
680 /* --- First up: display of simple classes in columns --- */
682 if (flags & f_simple) {
684 sym_base *w = 0, *x = 0, *y = 0, *z = 0;
687 /* --- Print the header line if necessary --- */
689 if (!(flags & f_header)) {
690 if (!(flags & f_nohead)) {
691 if (outmask & cat_from) printf("%-15s ", "FROM");
692 if (outmask & cat_to) printf("%-15s ", "TO");
693 if (outmask & cat_where) printf("%-24s ", "HOST");
694 if (outmask & cat_what) printf("%s", "COMMAND");
702 /* --- Print out the first row --- */
704 if (outmask & cat_from)
705 classfirstrow(r->from, "%-15.15s ", &a, cat_from, &imask);
706 if (outmask & cat_to)
707 classfirstrow(r->to, "%-15.15s ", &b, cat_to, &imask);
708 if (outmask & cat_where)
709 classfirstrow(r->host, "%-24.24s ", &c, cat_where, &imask);
710 if (outmask & cat_what)
711 classfirstrow(r->cmd, "%s", &d, cat_what, &imask);
714 /* --- And now for the rest --- */
717 if ((imask & cat_from) && (w = sym_next(&a)) == 0)
719 if ((imask & cat_to) && (x = sym_next(&b)) == 0)
721 if ((imask & cat_where) && (y = sym_next(&c)) == 0)
723 if ((imask & cat_what) && (z = sym_next(&d)) == 0)
729 if (outmask & cat_from) {
731 !(imask & cat_from) ? "" : xltuser(*(uid_t *)w->name));
734 if (outmask & cat_to) {
736 !(imask & cat_to) ? "" : xltuser(*(uid_t *)x->name));
739 if (outmask & cat_where)
740 printf("%-24.24s ", !(imask & cat_where) ? "" : y->name);
742 if (outmask & cat_what)
743 printf("%s", !(imask & cat_what) ? "" : z->name);
749 /* --- Otherwise deal with complex cases --- */
752 if (flags & f_header)
756 if (outmask & cat_from) {
757 fputs(" From: ", stdout);
758 showclass(r->from, showuseri, showuserh);
761 if (outmask & cat_to) {
762 fputs(" To: ", stdout);
763 showclass(r->to, showuseri, showuserh);
766 if (outmask & cat_where) {
767 fputs(" Hosts: ", stdout);
768 showclass(r->host, showstringi, showstringh);
771 if (outmask & cat_what) {
772 fputs("Commands: ", stdout);
773 showclass(r->cmd, showstringi, showstringh);
779 /*----- Dummy functions ---------------------------------------------------*/
781 void daemon_usePort(int p) { ; }
782 void daemon_readKey(const char *f) { ; }
784 /*----- Main code ---------------------------------------------------------*/
788 * Arguments: @int argc@ = number of command line arguments
789 * @char *argv[]@ = pointer to command line arguments
791 * Returns: Zero if all went OK.
793 * Use: Verifies and queries the `become' configuration file.
796 int main(int argc, char *argv[])
800 /* --- Initialise things --- */
803 ac = argc; av = argv;
805 /* --- Read the query tree --- */
809 /* --- Dump the tree if so requested --- */
811 if (flags & f_dump) {
816 /* --- Check columns requested --- */
818 if (outmask == (outmask & (outmask - 1)))
821 /* --- Read the ruleset --- */
823 if (!(flags & f_userdb)) {
834 FILE *fp = fopen(cf, "r");
838 die(1, "couldn't open configuration file `%s': %s", cf, strerror(errno));
845 /* --- Now scan the query --- */
848 rule *rl = rule_list(), *r;
850 /* --- Decide on output format if not already chosen --- */
852 if (!(flags & f_force)) {
856 if ((!qtree || checkrule(r, qtree)) &&
857 ((r->host->type & clNode_mask) >= clNode_binop ||
858 (r->from->type & clNode_mask) >= clNode_binop ||
859 (r->to->type & clNode_mask) >= clNode_binop ||
860 (r->cmd->type & clNode_mask) >= clNode_binop)) {
868 /* --- Now just dump the matching items --- */
872 if (!qtree || checkrule(r, qtree)) {
882 if (!(flags & f_match))
887 /*----- That's all, folks -------------------------------------------------*/