3 * Copyright (c) 1996, 1998-2005, 2007-2009
4 * Todd C. Miller <Todd.Miller@courtesan.com>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
18 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
20 * Sponsored in part by the Defense Advanced Research Projects
21 * Agency (DARPA) and Air Force Research Laboratory, Air Force
22 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
27 #include <sys/types.h>
28 #include <sys/param.h>
37 #endif /* STDC_HEADERS */
41 # ifdef HAVE_STRINGS_H
44 #endif /* HAVE_STRING_H */
47 #endif /* HAVE_UNISTD_H */
48 #if defined(YYBISON) && defined(HAVE_ALLOCA_H) && !defined(__GNUC__)
50 #endif /* YYBISON && HAVE_ALLOCA_H && !__GNUC__ */
57 * We must define SIZE_MAX for yacc's skeleton.c.
58 * If there is no SIZE_MAX or SIZE_T_MAX we have to assume that size_t
59 * could be signed (as it is on SunOS 4.x).
63 # define SIZE_MAX SIZE_T_MAX
65 # define SIZE_MAX INT_MAX
66 # endif /* SIZE_T_MAX */
72 extern int sudolineno;
78 char *errorfile = NULL;
80 struct defaults_list defaults;
81 struct userspec_list userspecs;
86 static void add_defaults __P((int, struct member *, struct defaults *));
87 static void add_userspec __P((struct member *, struct privilege *));
88 static struct defaults *new_default __P((char *, char *, int));
89 static struct member *new_member __P((char *, int));
90 void yyerror __P((const char *));
96 /* Save the line the first error occurred on. */
97 if (errorlineno == -1) {
98 errorlineno = sudolineno ? sudolineno - 1 : 0;
99 errorfile = estrdup(sudoers);
101 if (verbose && s != NULL) {
103 (void) fprintf(stderr, ">>> %s: %s near line %d <<<\n", sudoers, s,
104 sudolineno ? sudolineno - 1 : 0);
106 (void) fprintf(stderr, "<*> ");
114 struct cmndspec *cmndspec;
115 struct defaults *defaults;
116 struct member *member;
117 struct runascontainer *runas;
118 struct privilege *privilege;
119 struct sudo_command command;
121 struct selinux_info seinfo;
126 %start file /* special start symbol */
127 %token <command> COMMAND /* absolute pathname w/ optional args */
128 %token <string> ALIAS /* an UPPERCASE alias name */
129 %token <string> DEFVAR /* a Defaults variable name */
130 %token <string> NTWKADDR /* ipv4 or ipv6 address */
131 %token <string> NETGROUP /* a netgroup (+NAME) */
132 %token <string> USERGROUP /* a usergroup (%NAME) */
133 %token <string> WORD /* a word */
134 %token <tok> DEFAULTS /* Defaults entry */
135 %token <tok> DEFAULTS_HOST /* Host-specific defaults entry */
136 %token <tok> DEFAULTS_USER /* User-specific defaults entry */
137 %token <tok> DEFAULTS_RUNAS /* Runas-specific defaults entry */
138 %token <tok> DEFAULTS_CMND /* Command-specific defaults entry */
139 %token <tok> NOPASSWD /* no passwd req for command */
140 %token <tok> PASSWD /* passwd req for command (default) */
141 %token <tok> NOEXEC /* preload dummy execve() for cmnd */
142 %token <tok> EXEC /* don't preload dummy execve() */
143 %token <tok> SETENV /* user may set environment for cmnd */
144 %token <tok> NOSETENV /* user may not set environment */
145 %token <tok> ALL /* ALL keyword */
146 %token <tok> COMMENT /* comment and/or carriage return */
147 %token <tok> HOSTALIAS /* Host_Alias keyword */
148 %token <tok> CMNDALIAS /* Cmnd_Alias keyword */
149 %token <tok> USERALIAS /* User_Alias keyword */
150 %token <tok> RUNASALIAS /* Runas_Alias keyword */
151 %token <tok> ':' '=' ',' '!' '+' '-' /* union member tokens */
152 %token <tok> '(' ')' /* runas tokens */
154 %token <tok> TYPE /* SELinux type */
155 %token <tok> ROLE /* SELinux role */
157 %type <cmndspec> cmndspec
158 %type <cmndspec> cmndspeclist
159 %type <defaults> defaults_entry
160 %type <defaults> defaults_list
162 %type <member> opcmnd
163 %type <member> cmndlist
165 %type <member> hostlist
166 %type <member> ophost
167 %type <member> opuser
169 %type <member> userlist
170 %type <member> opgroup
172 %type <member> grouplist
173 %type <runas> runasspec
174 %type <runas> runaslist
175 %type <privilege> privilege
176 %type <privilege> privileges
178 %type <seinfo> selinux
179 %type <string> rolespec
180 %type <string> typespec
198 | userlist privileges {
199 add_userspec($1, $2);
201 | USERALIAS useraliases {
204 | HOSTALIAS hostaliases {
207 | CMNDALIAS cmndaliases {
210 | RUNASALIAS runasaliases {
213 | DEFAULTS defaults_list {
214 add_defaults(DEFAULTS, NULL, $2);
216 | DEFAULTS_USER userlist defaults_list {
217 add_defaults(DEFAULTS_USER, $2, $3);
219 | DEFAULTS_RUNAS userlist defaults_list {
220 add_defaults(DEFAULTS_RUNAS, $2, $3);
222 | DEFAULTS_HOST hostlist defaults_list {
223 add_defaults(DEFAULTS_HOST, $2, $3);
225 | DEFAULTS_CMND cmndlist defaults_list {
226 add_defaults(DEFAULTS_CMND, $2, $3);
230 defaults_list : defaults_entry
231 | defaults_list ',' defaults_entry {
237 defaults_entry : DEFVAR {
238 $$ = new_default($1, NULL, TRUE);
241 $$ = new_default($2, NULL, FALSE);
244 $$ = new_default($1, $3, TRUE);
247 $$ = new_default($1, $3, '+');
250 $$ = new_default($1, $3, '-');
254 privileges : privilege
255 | privileges ':' privilege {
261 privilege : hostlist '=' cmndspeclist {
262 struct privilege *p = emalloc(sizeof(*p));
263 list2tq(&p->hostlist, $1);
264 list2tq(&p->cmndlist, $3);
282 $$ = new_member($1, ALIAS);
285 $$ = new_member(NULL, ALL);
288 $$ = new_member($1, NETGROUP);
291 $$ = new_member($1, NTWKADDR);
294 $$ = new_member($1, WORD);
298 cmndspeclist : cmndspec
299 | cmndspeclist ',' cmndspec {
302 /* propagate role and type */
303 if ($3->role == NULL)
304 $3->role = $3->prev->role;
305 if ($3->type == NULL)
306 $3->type = $3->prev->type;
307 #endif /* HAVE_SELINUX */
308 /* propagate tags and runas list */
309 if ($3->tags.nopasswd == UNSPEC)
310 $3->tags.nopasswd = $3->prev->tags.nopasswd;
311 if ($3->tags.noexec == UNSPEC)
312 $3->tags.noexec = $3->prev->tags.noexec;
313 if ($3->tags.setenv == UNSPEC &&
314 $3->prev->tags.setenv != IMPLIED)
315 $3->tags.setenv = $3->prev->tags.setenv;
316 if ((tq_empty(&$3->runasuserlist) &&
317 tq_empty(&$3->runasgrouplist)) &&
318 (!tq_empty(&$3->prev->runasuserlist) ||
319 !tq_empty(&$3->prev->runasgrouplist))) {
320 $3->runasuserlist = $3->prev->runasuserlist;
321 $3->runasgrouplist = $3->prev->runasgrouplist;
327 cmndspec : runasspec selinux cmndtag opcmnd {
328 struct cmndspec *cs = emalloc(sizeof(*cs));
330 list2tq(&cs->runasuserlist, $1->runasusers);
331 list2tq(&cs->runasgrouplist, $1->runasgroups);
334 tq_init(&cs->runasuserlist);
335 tq_init(&cs->runasgrouplist);
345 /* sudo "ALL" implies the SETENV tag */
346 if (cs->cmnd->type == ALL && !cs->cmnd->negated &&
347 cs->tags.setenv == UNSPEC)
348 cs->tags.setenv = IMPLIED;
363 rolespec : ROLE '=' WORD {
368 typespec : TYPE '=' WORD {
373 selinux : /* empty */ {
385 | rolespec typespec {
389 | typespec rolespec {
395 runasspec : /* empty */ {
398 | '(' runaslist ')' {
403 runaslist : userlist {
404 $$ = emalloc(sizeof(struct runascontainer));
406 $$->runasgroups = NULL;
408 | userlist ':' grouplist {
409 $$ = emalloc(sizeof(struct runascontainer));
411 $$->runasgroups = $3;
414 $$ = emalloc(sizeof(struct runascontainer));
415 $$->runasusers = NULL;
416 $$->runasgroups = $2;
420 cmndtag : /* empty */ {
421 $$.nopasswd = $$.noexec = $$.setenv = UNSPEC;
444 $$ = new_member(NULL, ALL);
447 $$ = new_member($1, ALIAS);
450 struct sudo_command *c = emalloc(sizeof(*c));
453 $$ = new_member((char *)c, COMMAND);
457 hostaliases : hostalias
458 | hostaliases ':' hostalias
461 hostalias : ALIAS '=' hostlist {
463 if ((s = alias_add($1, HOSTALIAS, $3)) != NULL) {
471 | hostlist ',' ophost {
477 cmndaliases : cmndalias
478 | cmndaliases ':' cmndalias
481 cmndalias : ALIAS '=' cmndlist {
483 if ((s = alias_add($1, CMNDALIAS, $3)) != NULL) {
491 | cmndlist ',' opcmnd {
497 runasaliases : runasalias
498 | runasaliases ':' runasalias
501 runasalias : ALIAS '=' userlist {
503 if ((s = alias_add($1, RUNASALIAS, $3)) != NULL) {
510 useraliases : useralias
511 | useraliases ':' useralias
514 useralias : ALIAS '=' userlist {
516 if ((s = alias_add($1, USERALIAS, $3)) != NULL) {
524 | userlist ',' opuser {
541 $$ = new_member($1, ALIAS);
544 $$ = new_member(NULL, ALL);
547 $$ = new_member($1, NETGROUP);
550 $$ = new_member($1, USERGROUP);
553 $$ = new_member($1, WORD);
558 | grouplist ',' opgroup {
575 $$ = new_member($1, ALIAS);
578 $$ = new_member(NULL, ALL);
581 $$ = new_member($1, WORD);
586 static struct defaults *
587 new_default(var, val, op)
594 d = emalloc(sizeof(struct defaults));
597 tq_init(&d->binding);
606 static struct member *
607 new_member(name, type)
613 m = emalloc(sizeof(struct member));
623 * Add a list of defaults structures to the defaults list.
624 * The binding, if non-NULL, specifies a list of hosts, users, or
625 * runas users the entries apply to (specified by the type).
628 add_defaults(type, bmem, defs)
631 struct defaults *defs;
634 struct member_list binding;
637 * We can only call list2tq once on bmem as it will zero
638 * out the prev pointer when it consumes bmem.
640 list2tq(&binding, bmem);
643 * Set type and binding (who it applies to) for new entries.
645 for (d = defs; d != NULL; d = d->next) {
647 d->binding = binding;
649 tq_append(&defaults, defs);
653 * Allocate a new struct userspec, populate it, and insert it at the
654 * and of the userspecs list.
657 add_userspec(members, privs)
658 struct member *members;
659 struct privilege *privs;
663 u = emalloc(sizeof(*u));
664 list2tq(&u->users, members);
665 list2tq(&u->privileges, privs);
668 tq_append(&userspecs, u);
672 * Free up space used by data structures from a previous parser run and sets
673 * the current sudoers file to path.
676 init_parser(path, quiet)
681 struct member *m, *binding;
683 struct privilege *priv;
685 struct sudo_command *c;
687 while ((us = tq_pop(&userspecs)) != NULL) {
688 while ((m = tq_pop(&us->users)) != NULL) {
692 while ((priv = tq_pop(&us->privileges)) != NULL) {
693 struct member *runasuser = NULL, *runasgroup = NULL;
695 char *role = NULL, *type = NULL;
696 #endif /* HAVE_SELINUX */
698 while ((m = tq_pop(&priv->hostlist)) != NULL) {
702 while ((cs = tq_pop(&priv->cmndlist)) != NULL) {
704 /* Only free the first instance of a role/type. */
705 if (cs->role != role) {
709 if (cs->type != type) {
713 #endif /* HAVE_SELINUX */
714 if (tq_last(&cs->runasuserlist) != runasuser) {
715 runasuser = tq_last(&cs->runasuserlist);
716 while ((m = tq_pop(&cs->runasuserlist)) != NULL) {
721 if (tq_last(&cs->runasgrouplist) != runasgroup) {
722 runasgroup = tq_last(&cs->runasgrouplist);
723 while ((m = tq_pop(&cs->runasgrouplist)) != NULL) {
728 if (cs->cmnd->type == COMMAND) {
729 c = (struct sudo_command *) cs->cmnd->name;
733 efree(cs->cmnd->name);
744 while ((d = tq_pop(&defaults)) != NULL) {
745 if (tq_last(&d->binding) != binding) {
746 binding = tq_last(&d->binding);
747 while ((m = tq_pop(&d->binding)) != NULL) {
748 if (m->type == COMMAND) {
749 c = (struct sudo_command *) m->name;
768 sudoers = path ? estrdup(path) : NULL;