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1.1 millert 1: %{
2: /*
1.4 millert 3: * Copyright (c) 1996, 1998-2005, 2007-2009
1.1 millert 4: * Todd C. Miller <Todd.Miller@courtesan.com>
5: *
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.
9: *
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: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
18: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
19: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
20: *
21: * Sponsored in part by the Defense Advanced Research Projects
22: * Agency (DARPA) and Air Force Research Laboratory, Air Force
23: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
24: */
25:
26: #include <config.h>
27:
28: #include <sys/types.h>
29: #include <sys/param.h>
1.4 millert 30: #include <sys/stat.h>
1.1 millert 31: #include <stdio.h>
32: #ifdef STDC_HEADERS
33: # include <stdlib.h>
34: # include <stddef.h>
35: #else
36: # ifdef HAVE_STDLIB_H
37: # include <stdlib.h>
38: # endif
39: #endif /* STDC_HEADERS */
40: #ifdef HAVE_STRING_H
41: # include <string.h>
42: #else
43: # ifdef HAVE_STRINGS_H
44: # include <strings.h>
45: # endif
46: #endif /* HAVE_STRING_H */
47: #ifdef HAVE_UNISTD_H
48: # include <unistd.h>
49: #endif /* HAVE_UNISTD_H */
50: #if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
51: # include <malloc.h>
52: #endif /* HAVE_MALLOC_H && !STDC_HEADERS */
1.4 millert 53: #ifdef HAVE_DIRENT_H
54: # include <dirent.h>
55: # define NAMLEN(dirent) strlen((dirent)->d_name)
56: #else
57: # define dirent direct
58: # define NAMLEN(dirent) (dirent)->d_namlen
59: # ifdef HAVE_SYS_NDIR_H
60: # include <sys/ndir.h>
61: # endif
62: # ifdef HAVE_SYS_DIR_H
63: # include <sys/dir.h>
64: # endif
65: # ifdef HAVE_NDIR_H
66: # include <ndir.h>
67: # endif
68: #endif
1.1 millert 69: #include <ctype.h>
70: #include "sudo.h"
71: #include "parse.h"
72: #include <gram.h>
73:
74: extern YYSTYPE yylval;
1.6 millert 75: extern int parse_error;
1.1 millert 76: int sudolineno = 1;
77: char *sudoers;
78: static int sawspace = 0;
79: static int arg_len = 0;
80: static int arg_size = 0;
81:
82: static int append __P((char *, int));
83: static int _fill __P((char *, int, int));
84: static int fill_cmnd __P((char *, int));
85: static int fill_args __P((char *, int, int));
1.4 millert 86: static int _push_include __P((char *, int));
87: static int pop_include __P((void));
1.1 millert 88: static int ipv6_valid __P((const char *s));
89: static char *parse_include __P((char *));
90: extern void yyerror __P((const char *));
91:
92: #define fill(a, b) _fill(a, b, 0)
93:
1.4 millert 94: #define push_include(_p) (_push_include((_p), FALSE))
95: #define push_includedir(_p) (_push_include((_p), TRUE))
1.1 millert 96:
97: /* realloc() to size + COMMANDARGINC to make room for command args */
98: #define COMMANDARGINC 64
99:
100: #ifdef TRACELEXER
101: #define LEXTRACE(msg) fputs(msg, stderr)
102: #else
103: #define LEXTRACE(msg)
104: #endif
105: %}
106:
107: HEX16 [0-9A-Fa-f]{1,4}
108: OCTET (1?[0-9]{1,2})|(2[0-4][0-9])|(25[0-5])
109: IPV4ADDR {OCTET}(\.{OCTET}){3}
110: IPV6ADDR ({HEX16}?:){2,7}{HEX16}?|({HEX16}?:){2,6}:{IPV4ADDR}
111:
112: HOSTNAME [[:alnum:]_-]+
113: WORD ([^#>!=:,\(\) \t\n\\]|\\[^\n])+
114: ID #-?[0-9]+
115: PATH \/(\\[\,:= \t#]|[^\,:=\\ \t\n#])+
116: ENVAR ([^#!=, \t\n\\\"]|\\[^\n])([^#=, \t\n\\\"]|\\[^\n])*
117: DEFVAR [a-z_]+
118:
119: %option nounput
120: %option noyywrap
121:
122: %s GOTDEFS
123: %x GOTCMND
124: %x STARTDEFS
125: %x INDEFS
126: %x INSTR
127:
128: %%
129: <GOTDEFS>[[:blank:]]+ BEGIN STARTDEFS;
130:
131: <STARTDEFS>{DEFVAR} {
132: BEGIN INDEFS;
133: LEXTRACE("DEFVAR ");
134: if (!fill(yytext, yyleng))
135: yyterminate();
136: return(DEFVAR);
137: }
138:
139: <INDEFS>{
140: , {
141: BEGIN STARTDEFS;
142: LEXTRACE(", ");
143: return(',');
144: } /* return ',' */
145:
146: = {
147: LEXTRACE("= ");
148: return('=');
149: } /* return '=' */
150:
151: \+= {
152: LEXTRACE("+= ");
153: return('+');
154: } /* return '+' */
155:
156: -= {
157: LEXTRACE("-= ");
158: return('-');
159: } /* return '-' */
160:
161: \" {
162: LEXTRACE("BEGINSTR ");
163: yylval.string = NULL;
164: BEGIN INSTR;
165: }
166:
167: {ENVAR} {
168: LEXTRACE("WORD(2) ");
169: if (!fill(yytext, yyleng))
170: yyterminate();
171: return(WORD);
172: }
173: }
174:
175: <INSTR>{
176: \\[[:blank:]]*\n[[:blank:]]* {
177: /* Line continuation char followed by newline. */
178: ++sudolineno;
179: LEXTRACE("\n");
180: }
181:
182: \" {
183: LEXTRACE("ENDSTR ");
184: BEGIN INDEFS;
185: return(WORD);
186: }
187:
188: \\ {
189: LEXTRACE("BACKSLASH ");
190: if (!append(yytext, yyleng))
191: yyterminate();
192: }
193:
194: ([^\"\n\\]|\\\")+ {
195: LEXTRACE("STRBODY ");
196: if (!append(yytext, yyleng))
197: yyterminate();
198: }
199: }
200:
201: <GOTCMND>{
202: \\[\*\?\[\]\!] {
203: /* quoted fnmatch glob char, pass verbatim */
204: LEXTRACE("QUOTEDCHAR ");
205: if (!fill_args(yytext, 2, sawspace))
206: yyterminate();
207: sawspace = FALSE;
208: }
209:
210: \\[:\\,= \t#] {
211: /* quoted sudoers special char, strip backslash */
212: LEXTRACE("QUOTEDCHAR ");
213: if (!fill_args(yytext + 1, 1, sawspace))
214: yyterminate();
215: sawspace = FALSE;
216: }
217:
218: [#:\,=\n] {
219: BEGIN INITIAL;
220: yyless(0);
221: return(COMMAND);
222: } /* end of command line args */
223:
224: [^\\:, \t\n]+ {
225: LEXTRACE("ARG ");
226: if (!fill_args(yytext, yyleng, sawspace))
227: yyterminate();
228: sawspace = FALSE;
229: } /* a command line arg */
230: }
231:
232: <INITIAL>^#include[[:blank:]]+\/.*\n {
233: char *path;
234:
235: if ((path = parse_include(yytext)) == NULL)
236: yyterminate();
237:
238: LEXTRACE("INCLUDE\n");
239:
240: /* Push current buffer and switch to include file */
241: if (!push_include(path))
242: yyterminate();
243: }
244:
1.4 millert 245: <INITIAL>^#includedir[[:blank:]]+\/.*\n {
246: char *path;
247:
248: if ((path = parse_include(yytext)) == NULL)
249: yyterminate();
250:
251: LEXTRACE("INCLUDEDIR\n");
252:
1.6 millert 253: /*
254: * Push current buffer and switch to include file.
255: * We simply ignore empty directories.
256: */
257: if (!push_includedir(path) && parse_error)
1.4 millert 258: yyterminate();
259: }
260:
1.1 millert 261: <INITIAL>^[[:blank:]]*Defaults([:@>\!]{WORD})? {
262: int n;
263: for (n = 0; isblank((unsigned char)yytext[n]); n++)
264: continue;
265: n += 8;
266: BEGIN GOTDEFS;
267: switch (yytext[n++]) {
268: case ':':
269: yyless(n);
270: LEXTRACE("DEFAULTS_USER ");
271: return(DEFAULTS_USER);
272: case '>':
273: yyless(n);
274: LEXTRACE("DEFAULTS_RUNAS ");
275: return(DEFAULTS_RUNAS);
276: case '@':
277: yyless(n);
278: LEXTRACE("DEFAULTS_HOST ");
279: return(DEFAULTS_HOST);
280: case '!':
281: yyless(n);
282: LEXTRACE("DEFAULTS_CMND ");
283: return(DEFAULTS_CMND);
284: default:
285: LEXTRACE("DEFAULTS ");
286: return(DEFAULTS);
287: }
288: }
289:
290: <INITIAL>^[[:blank:]]*(Host|Cmnd|User|Runas)_Alias {
291: int n;
292: for (n = 0; isblank((unsigned char)yytext[n]); n++)
293: continue;
294: switch (yytext[n]) {
295: case 'H':
296: LEXTRACE("HOSTALIAS ");
297: return(HOSTALIAS);
298: case 'C':
299: LEXTRACE("CMNDALIAS ");
300: return(CMNDALIAS);
301: case 'U':
302: LEXTRACE("USERALIAS ");
303: return(USERALIAS);
304: case 'R':
305: LEXTRACE("RUNASALIAS ");
306: return(RUNASALIAS);
307: }
308: }
309:
310: NOPASSWD[[:blank:]]*: {
311: /* cmnd does not require passwd for this user */
312: LEXTRACE("NOPASSWD ");
313: return(NOPASSWD);
314: }
315:
316: PASSWD[[:blank:]]*: {
317: /* cmnd requires passwd for this user */
318: LEXTRACE("PASSWD ");
319: return(PASSWD);
320: }
321:
322: NOEXEC[[:blank:]]*: {
323: LEXTRACE("NOEXEC ");
324: return(NOEXEC);
325: }
326:
327: EXEC[[:blank:]]*: {
328: LEXTRACE("EXEC ");
329: return(EXEC);
330: }
331:
332: SETENV[[:blank:]]*: {
333: LEXTRACE("SETENV ");
334: return(SETENV);
335: }
336:
337: NOSETENV[[:blank:]]*: {
338: LEXTRACE("NOSETENV ");
339: return(NOSETENV);
340: }
341:
342: \+{WORD} {
343: /* netgroup */
344: if (!fill(yytext, yyleng))
345: yyterminate();
346: LEXTRACE("NETGROUP ");
347: return(NETGROUP);
348: }
349:
1.4 millert 350: \%:?{WORD} {
1.1 millert 351: /* UN*X group */
352: if (!fill(yytext, yyleng))
353: yyterminate();
354: LEXTRACE("USERGROUP ");
355: return(USERGROUP);
356: }
357:
358: {IPV4ADDR}(\/{IPV4ADDR})? {
359: if (!fill(yytext, yyleng))
360: yyterminate();
361: LEXTRACE("NTWKADDR ");
362: return(NTWKADDR);
363: }
364:
1.8 ! espie 365: {IPV4ADDR}\/([12]?[0-9]|3[0-2]|) {
1.1 millert 366: if (!fill(yytext, yyleng))
367: yyterminate();
368: LEXTRACE("NTWKADDR ");
369: return(NTWKADDR);
370: }
371:
372: {IPV6ADDR}(\/{IPV6ADDR})? {
373: if (!ipv6_valid(yytext)) {
374: LEXTRACE("ERROR ");
375: return(ERROR);
376: }
377: if (!fill(yytext, yyleng))
378: yyterminate();
379: LEXTRACE("NTWKADDR ");
380: return(NTWKADDR);
381: }
382:
383: {IPV6ADDR}\/([0-9]|[1-9][0-9]|1[01][0-9]|12[0-8]) {
384: if (!ipv6_valid(yytext)) {
385: LEXTRACE("ERROR ");
386: return(ERROR);
387: }
388: if (!fill(yytext, yyleng))
389: yyterminate();
390: LEXTRACE("NTWKADDR ");
391: return(NTWKADDR);
392: }
393:
394: [[:upper:]][[:upper:][:digit:]_]* {
395: if (strcmp(yytext, "ALL") == 0) {
396: LEXTRACE("ALL ");
397: return(ALL);
398: }
399: #ifdef HAVE_SELINUX
400: /* XXX - restrict type/role to initial state */
401: if (strcmp(yytext, "TYPE") == 0) {
402: LEXTRACE("TYPE ");
403: return(TYPE);
404: }
405: if (strcmp(yytext, "ROLE") == 0) {
406: LEXTRACE("ROLE ");
407: return(ROLE);
408: }
409: #endif /* HAVE_SELINUX */
410: if (!fill(yytext, yyleng))
411: yyterminate();
412: LEXTRACE("ALIAS ");
413: return(ALIAS);
414: }
415:
416: <GOTDEFS>({PATH}|sudoedit) {
417: /* no command args allowed for Defaults!/path */
418: if (!fill_cmnd(yytext, yyleng))
419: yyterminate();
420: LEXTRACE("COMMAND ");
421: return(COMMAND);
422: }
423:
424: sudoedit {
425: BEGIN GOTCMND;
426: LEXTRACE("COMMAND ");
427: if (!fill_cmnd(yytext, yyleng))
428: yyterminate();
429: } /* sudo -e */
430:
431: {PATH} {
432: /* directories can't have args... */
433: if (yytext[yyleng - 1] == '/') {
434: LEXTRACE("COMMAND ");
435: if (!fill_cmnd(yytext, yyleng))
436: yyterminate();
437: return(COMMAND);
438: } else {
439: BEGIN GOTCMND;
440: LEXTRACE("COMMAND ");
441: if (!fill_cmnd(yytext, yyleng))
442: yyterminate();
443: }
444: } /* a pathname */
445:
1.4 millert 446: <INITIAL,GOTDEFS>\"[^"\n]+\" {
447: /* a quoted user/group name */
448: if (!fill(yytext + 1, yyleng - 2))
449: yyterminate();
450: switch (yytext[1]) {
451: case '%':
452: LEXTRACE("USERGROUP ");
453: return(USERGROUP);
454: case '+':
455: LEXTRACE("NETGROUP ");
456: return(NETGROUP);
457: default:
458: LEXTRACE("WORD(4) ");
459: return(WORD);
460: }
461: }
462:
1.1 millert 463: <INITIAL,GOTDEFS>({ID}|{WORD}) {
464: /* a word */
465: if (!fill(yytext, yyleng))
466: yyterminate();
1.4 millert 467: LEXTRACE("WORD(5) ");
1.1 millert 468: return(WORD);
469: }
470:
471: \( {
472: LEXTRACE("( ");
473: return ('(');
474: }
475:
476: \) {
477: LEXTRACE(") ");
478: return(')');
479: }
480:
481: , {
482: LEXTRACE(", ");
483: return(',');
484: } /* return ',' */
485:
486: = {
487: LEXTRACE("= ");
488: return('=');
489: } /* return '=' */
490:
491: : {
492: LEXTRACE(": ");
493: return(':');
494: } /* return ':' */
495:
496: <*>!+ {
497: if (yyleng % 2 == 1)
498: return('!'); /* return '!' */
499: }
500:
501: <*>\n {
502: BEGIN INITIAL;
503: ++sudolineno;
504: LEXTRACE("\n");
505: return(COMMENT);
506: } /* return newline */
507:
508: <*>[[:blank:]]+ { /* throw away space/tabs */
509: sawspace = TRUE; /* but remember for fill_args */
510: }
511:
512: <*>\\[[:blank:]]*\n {
513: sawspace = TRUE; /* remember for fill_args */
514: ++sudolineno;
515: LEXTRACE("\n\t");
516: } /* throw away EOL after \ */
517:
1.3 millert 518: <INITIAL,STARTDEFS,INDEFS>#(-[^\n0-9].*|[^\n0-9-].*)?\n {
1.1 millert 519: BEGIN INITIAL;
520: ++sudolineno;
521: LEXTRACE("\n");
522: return(COMMENT);
1.3 millert 523: } /* comment, not uid/gid */
1.1 millert 524:
525: <*>. {
526: LEXTRACE("ERROR ");
527: return(ERROR);
528: } /* parse error */
529:
530: <*><<EOF>> {
531: if (YY_START != INITIAL) {
532: BEGIN INITIAL;
533: LEXTRACE("ERROR ");
534: return(ERROR);
535: }
536: if (!pop_include())
537: yyterminate();
538: }
539:
540: %%
1.4 millert 541: static unsigned char
542: hexchar(s)
543: const char *s;
544: {
545: int i;
546: int result = 0;
547:
548: s += 2; /* skip \\x */
549: for (i = 0; i < 2; i++) {
550: switch (*s) {
551: case 'A':
552: case 'a':
553: result += 10;
554: break;
555: case 'B':
556: case 'b':
557: result += 11;
558: break;
559: case 'C':
560: case 'c':
561: result += 12;
562: break;
563: case 'D':
564: case 'd':
565: result += 13;
566: break;
567: case 'E':
568: case 'e':
569: result += 14;
570: break;
571: case 'F':
572: case 'f':
573: result += 15;
574: break;
575: default:
576: result += *s - '0';
577: break;
578: }
579: if (i == 0) {
580: result *= 16;
581: s++;
582: }
583: }
584: return((unsigned char)result);
585: }
586:
1.1 millert 587: static int
588: _fill(src, len, olen)
589: char *src;
590: int len, olen;
591: {
592: char *dst;
593:
594: dst = olen ? realloc(yylval.string, olen + len + 1) : malloc(len + 1);
595: if (dst == NULL) {
596: yyerror("unable to allocate memory");
597: return(FALSE);
598: }
599: yylval.string = dst;
600:
601: /* Copy the string and collapse any escaped characters. */
602: dst += olen;
1.4 millert 603: while (len--) {
604: if (*src == '\\' && len) {
605: if (src[1] == 'x' && len >= 3 &&
606: isxdigit((unsigned char) src[2]) &&
607: isxdigit((unsigned char) src[3])) {
608: *dst++ = hexchar(src);
609: src += 4;
610: len -= 3;
611: } else {
612: src++;
613: len--;
614: *dst++ = *src++;
615: }
616: } else {
617: *dst++ = *src++;
618: }
1.1 millert 619: }
1.4 millert 620: *dst = '\0';
1.1 millert 621: return(TRUE);
622: }
623:
624: static int
625: append(src, len)
626: char *src;
627: int len;
628: {
629: int olen = 0;
630:
631: if (yylval.string != NULL)
632: olen = strlen(yylval.string);
633:
634: return(_fill(src, len, olen));
635: }
636:
637: #define SPECIAL(c) \
638: ((c) == ',' || (c) == ':' || (c) == '=' || (c) == ' ' || (c) == '\t' || (c) == '#')
639:
640: static int
641: fill_cmnd(src, len)
642: char *src;
643: int len;
644: {
645: char *dst;
646: int i;
647:
648: arg_len = arg_size = 0;
649:
650: dst = yylval.command.cmnd = (char *) malloc(len + 1);
651: if (yylval.command.cmnd == NULL) {
652: yyerror("unable to allocate memory");
653: return(FALSE);
654: }
655:
656: /* Copy the string and collapse any escaped sudo-specific characters. */
657: for (i = 0; i < len; i++) {
658: if (src[i] == '\\' && i != len - 1 && SPECIAL(src[i + 1]))
659: *dst++ = src[++i];
660: else
661: *dst++ = src[i];
662: }
663: *dst = '\0';
664:
665: yylval.command.args = NULL;
666: return(TRUE);
667: }
668:
669: static int
670: fill_args(s, len, addspace)
671: char *s;
672: int len;
673: int addspace;
674: {
675: int new_len;
676: char *p;
677:
678: if (yylval.command.args == NULL) {
679: addspace = 0;
680: new_len = len;
681: } else
682: new_len = arg_len + len + addspace;
683:
684: if (new_len >= arg_size) {
685: /* Allocate more space than we need for subsequent args */
686: while (new_len >= (arg_size += COMMANDARGINC))
687: ;
688:
689: p = yylval.command.args ?
690: (char *) realloc(yylval.command.args, arg_size) :
691: (char *) malloc(arg_size);
692: if (p == NULL) {
693: efree(yylval.command.args);
694: yyerror("unable to allocate memory");
695: return(FALSE);
696: } else
697: yylval.command.args = p;
698: }
699:
700: /* Efficiently append the arg (with a leading space if needed). */
701: p = yylval.command.args + arg_len;
702: if (addspace)
703: *p++ = ' ';
704: if (strlcpy(p, s, arg_size - (p - yylval.command.args)) != len) {
705: yyerror("fill_args: buffer overflow"); /* paranoia */
706: return(FALSE);
707: }
708: arg_len = new_len;
709: return(TRUE);
710: }
711:
1.4 millert 712: struct path_list {
713: char *path;
714: struct path_list *next;
715: };
716:
717: struct include_stack {
1.1 millert 718: YY_BUFFER_STATE bs;
719: char *path;
1.4 millert 720: struct path_list *more; /* more files in case of includedir */
1.1 millert 721: int lineno;
1.4 millert 722: int keepopen;
1.1 millert 723: };
724:
1.4 millert 725: static int
726: pl_compare(v1, v2)
727: const void *v1;
728: const void *v2;
729: {
730: const struct path_list * const *p1 = v1;
731: const struct path_list * const *p2 = v2;
732:
733: return(strcmp((*p1)->path, (*p2)->path));
734: }
735:
736: static char *
737: switch_dir(stack, dirpath)
738: struct include_stack *stack;
739: char *dirpath;
740: {
741: DIR *dir;
742: int i, count = 0;
743: char *path = NULL;
744: struct dirent *dent;
745: struct stat sb;
746: struct path_list *pl, *first = NULL;
747: struct path_list **sorted = NULL;
748:
749: if (!(dir = opendir(dirpath))) {
750: yyerror(dirpath);
1.6 millert 751: return(NULL);
1.4 millert 752: }
753: while ((dent = readdir(dir))) {
754: /* Ignore files that end in '~' or have a '.' in them. */
755: if (dent->d_name[0] == '\0' || dent->d_name[NAMLEN(dent) - 1] == '~'
756: || strchr(dent->d_name, '.') != NULL) {
757: continue;
758: }
759: if (asprintf(&path, "%s/%s", dirpath, dent->d_name) == -1) {
760: closedir(dir);
761: goto bad;
762: }
763: if (stat(path, &sb) != 0 || !S_ISREG(sb.st_mode)) {
764: efree(path);
765: continue;
766: }
767: pl = malloc(sizeof(*pl));
768: if (pl == NULL)
769: goto bad;
770: pl->path = path;
771: pl->next = first;
772: first = pl;
773: count++;
774: }
775: closedir(dir);
776:
777: if (count == 0)
778: goto done;
779:
780: /* Sort the list as an array. */
781: sorted = malloc(sizeof(*sorted) * count);
782: if (sorted == NULL)
783: goto bad;
784: pl = first;
785: for (i = 0; i < count; i++) {
786: sorted[i] = pl;
787: pl = pl->next;
788: }
789: qsort(sorted, count, sizeof(*sorted), pl_compare);
790:
791: /* Apply sorting to the list. */
792: first = sorted[0];
793: sorted[count - 1]->next = NULL;
794: for (i = 1; i < count; i++)
795: sorted[i - 1]->next = sorted[i];
796: efree(sorted);
797:
798: /* Pull out the first element for parsing, leave the rest for later. */
799: if (count) {
800: path = first->path;
801: pl = first->next;
802: efree(first);
803: stack->more = pl;
804: } else {
805: path = NULL;
806: }
807: done:
808: efree(dirpath);
809: return(path);
810: bad:
811: while (first != NULL) {
812: pl = first;
813: first = pl->next;
814: free(pl->path);
815: free(pl);
816: }
817: efree(sorted);
818: efree(dirpath);
819: efree(path);
820: return(NULL);
821: }
822:
1.1 millert 823: #define MAX_SUDOERS_DEPTH 128
824: #define SUDOERS_STACK_INCREMENT 16
825:
1.4 millert 826: static size_t istacksize, idepth;
827: static struct include_stack *istack;
828: static int keepopen;
829:
830: void
831: init_lexer()
832: {
833: struct path_list *pl;
834:
835: while (idepth) {
836: idepth--;
837: while ((pl = istack[idepth].more) != NULL) {
838: istack[idepth].more = pl->next;
839: efree(pl->path);
840: efree(pl);
841: }
842: efree(istack[idepth].path);
1.7 millert 843: if (idepth && !istack[idepth].keepopen)
1.4 millert 844: fclose(istack[idepth].bs->yy_input_file);
845: yy_delete_buffer(istack[idepth].bs);
846: }
847: efree(istack);
848: istack = NULL;
849: istacksize = idepth = 0;
850: keepopen = FALSE;
851: }
852:
1.1 millert 853: static int
1.4 millert 854: _push_include(path, isdir)
1.1 millert 855: char *path;
1.4 millert 856: int isdir;
1.1 millert 857: {
858: FILE *fp;
859:
1.4 millert 860: /* push current state onto stack */
861: if (idepth >= istacksize) {
862: if (idepth > MAX_SUDOERS_DEPTH) {
863: yyerror("too many levels of includes");
864: return(FALSE);
865: }
866: istacksize += SUDOERS_STACK_INCREMENT;
867: istack = (struct include_stack *) realloc(istack,
1.7 millert 868: sizeof(*istack) * istacksize);
1.4 millert 869: if (istack == NULL) {
870: yyerror("unable to allocate memory");
871: return(FALSE);
872: }
873: }
874: if (isdir) {
875: if (!(path = switch_dir(&istack[idepth], path))) {
1.6 millert 876: /* switch_dir() called yyerror() for us */
1.4 millert 877: return(FALSE);
878: }
879: if ((fp = open_sudoers(path, FALSE, &keepopen)) == NULL) {
880: yyerror(path);
1.6 millert 881: return(FALSE); /* XXX - just to go next one */
1.1 millert 882: }
1.4 millert 883: } else {
884: if ((fp = open_sudoers(path, TRUE, &keepopen)) == NULL) {
1.1 millert 885: yyerror(path);
886: return(FALSE);
887: }
1.4 millert 888: istack[idepth].more = NULL;
889: }
890: /* Push the old (current) file and open the new one. */
891: istack[idepth].path = sudoers; /* push old path */
892: istack[idepth].bs = YY_CURRENT_BUFFER;
893: istack[idepth].lineno = sudolineno;
894: istack[idepth].keepopen = keepopen;
895: idepth++;
896: sudolineno = 1;
897: sudoers = path;
898: yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
899:
900: return(TRUE);
901: }
902:
903: static int
904: pop_include()
905: {
906: struct path_list *pl;
907: FILE *fp;
908:
909: if (idepth == 0)
910: return(FALSE);
911:
912: if (!keepopen)
913: fclose(YY_CURRENT_BUFFER->yy_input_file);
914: yy_delete_buffer(YY_CURRENT_BUFFER);
915: keepopen = FALSE;
916: if ((pl = istack[idepth - 1].more) != NULL) {
917: /* Move to next file in the dir. */
918: istack[idepth - 1].more = pl->next;
919: if ((fp = open_sudoers(pl->path, FALSE, &keepopen)) == NULL) {
920: yyerror(pl->path);
1.6 millert 921: return(FALSE); /* XXX - just to go next one */
1.4 millert 922: }
923: efree(sudoers);
924: sudoers = pl->path;
1.1 millert 925: sudolineno = 1;
926: yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
1.4 millert 927: efree(pl);
1.1 millert 928: } else {
1.4 millert 929: idepth--;
930: yy_switch_to_buffer(istack[idepth].bs);
1.1 millert 931: efree(sudoers);
1.4 millert 932: sudoers = istack[idepth].path;
933: sudolineno = istack[idepth].lineno;
1.1 millert 934: }
935: return(TRUE);
936: }
937:
938: static char *
939: parse_include(base)
940: char *base;
941: {
942: char *cp, *ep, *path;
1.3 millert 943: int len = 0, subst = 0;
944: size_t shost_len = 0;
1.1 millert 945:
946: /* Pull out path from #include line. */
947: cp = base + sizeof("#include");
1.4 millert 948: if (*cp == 'i')
949: cp += 3; /* includedir */
1.1 millert 950: while (isblank((unsigned char) *cp))
951: cp++;
952: ep = cp;
1.3 millert 953: while (*ep != '\0' && !isspace((unsigned char) *ep)) {
954: if (ep[0] == '%' && ep[1] == 'h') {
955: shost_len = strlen(user_shost);
956: len += shost_len - 2;
957: subst = 1;
958: }
1.1 millert 959: ep++;
1.3 millert 960: }
1.1 millert 961:
962: /* Make a copy of path and return it. */
1.3 millert 963: len += (int)(ep - cp);
1.1 millert 964: if ((path = malloc(len + 1)) == NULL)
965: yyerror("unable to allocate memory");
1.3 millert 966: if (subst) {
967: /* substitute for %h */
968: char *pp = path;
969: while (cp < ep) {
970: if (cp[0] == '%' && cp[1] == 'h') {
971: memcpy(pp, user_shost, shost_len);
972: pp += shost_len;
973: cp += 2;
1.5 millert 974: continue;
1.3 millert 975: }
976: *pp++ = *cp++;
977: }
978: *pp = '\0';
979: } else {
980: memcpy(path, cp, len);
981: path[len] = '\0';
982: }
1.1 millert 983:
984: /* Push any excess characters (e.g. comment, newline) back to the lexer */
985: if (*ep != '\0')
986: yyless((int)(ep - base));
987:
988: return(path);
989: }
990:
991: /*
992: * Check to make sure an IPv6 address does not contain multiple instances
993: * of the string "::". Assumes strlen(s) >= 1.
994: * Returns TRUE if address is valid else FALSE.
995: */
996: static int
997: ipv6_valid(s)
998: const char *s;
999: {
1000: int nmatch = 0;
1001:
1002: for (; *s != '\0'; s++) {
1003: if (s[0] == ':' && s[1] == ':') {
1004: if (++nmatch > 1)
1005: break;
1006: }
1007: if (s[0] == '/')
1008: nmatch = 0; /* reset if we hit netmask */
1009: }
1010:
1011: return (nmatch <= 1);
1012: }