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1.20 ! tedu 1: /* $OpenBSD: parse.y,v 1.19 2016/06/27 15:41:17 tedu Exp $ */
1.1 tedu 2: /*
3: * Copyright (c) 2015 Ted Unangst <tedu@openbsd.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: %{
19: #include <sys/types.h>
20: #include <ctype.h>
21: #include <unistd.h>
22: #include <stdint.h>
23: #include <stdarg.h>
24: #include <stdio.h>
25: #include <string.h>
26: #include <err.h>
27:
28: #include "doas.h"
29:
30: typedef struct {
31: union {
32: struct {
33: int action;
34: int options;
1.7 zhuk 35: const char *cmd;
36: const char **cmdargs;
1.1 tedu 37: const char **envlist;
38: };
39: const char *str;
40: };
1.10 zhuk 41: int lineno;
42: int colno;
1.1 tedu 43: } yystype;
44: #define YYSTYPE yystype
45:
46: FILE *yyfp;
47:
48: struct rule **rules;
49: int nrules, maxrules;
1.10 zhuk 50: int parse_errors = 0;
1.19 tedu 51: int obsolete_warned = 0;
1.1 tedu 52:
1.4 nicm 53: void yyerror(const char *, ...);
54: int yylex(void);
55: int yyparse(void);
56:
1.1 tedu 57: %}
58:
1.7 zhuk 59: %token TPERMIT TDENY TAS TCMD TARGS
1.20 ! tedu 60: %token TNOPASS TPERSIST TKEEPENV TSETENV
1.1 tedu 61: %token TSTRING
62:
63: %%
64:
65: grammar: /* empty */
66: | grammar '\n'
67: | grammar rule '\n'
1.10 zhuk 68: | error '\n'
1.1 tedu 69: ;
70:
71: rule: action ident target cmd {
72: struct rule *r;
73: r = calloc(1, sizeof(*r));
1.2 nicm 74: if (!r)
75: errx(1, "can't allocate rule");
1.1 tedu 76: r->action = $1.action;
77: r->options = $1.options;
78: r->envlist = $1.envlist;
79: r->ident = $2.str;
80: r->target = $3.str;
1.7 zhuk 81: r->cmd = $4.cmd;
82: r->cmdargs = $4.cmdargs;
1.1 tedu 83: if (nrules == maxrules) {
84: if (maxrules == 0)
85: maxrules = 63;
86: else
87: maxrules *= 2;
1.6 benno 88: if (!(rules = reallocarray(rules, maxrules,
89: sizeof(*rules))))
1.1 tedu 90: errx(1, "can't allocate rules");
91: }
92: rules[nrules++] = r;
93: } ;
94:
95: action: TPERMIT options {
96: $$.action = PERMIT;
97: $$.options = $2.options;
98: $$.envlist = $2.envlist;
99: } | TDENY {
100: $$.action = DENY;
1.19 tedu 101: $$.options = 0;
102: $$.envlist = NULL;
1.1 tedu 103: } ;
104:
1.19 tedu 105: options: /* none */ {
106: $$.options = 0;
107: $$.envlist = NULL;
108: } | options option {
1.1 tedu 109: $$.options = $1.options | $2.options;
110: $$.envlist = $1.envlist;
111: if ($2.envlist) {
1.10 zhuk 112: if ($$.envlist) {
1.19 tedu 113: yyerror("can't have two setenv sections");
1.10 zhuk 114: YYERROR;
115: } else
1.1 tedu 116: $$.envlist = $2.envlist;
117: }
118: } ;
119: option: TNOPASS {
120: $$.options = NOPASS;
1.19 tedu 121: $$.envlist = NULL;
1.20 ! tedu 122: } | TPERSIST {
! 123: $$.options = PERSIST;
! 124: $$.envlist = NULL;
1.1 tedu 125: } | TKEEPENV {
126: $$.options = KEEPENV;
1.19 tedu 127: $$.envlist = NULL;
1.1 tedu 128: } | TKEEPENV '{' envlist '}' {
1.19 tedu 129: $$.options = 0;
130: if (!obsolete_warned) {
131: warnx("keepenv with list is obsolete");
132: obsolete_warned = 1;
133: }
134: $$.envlist = $3.envlist;
135: } | TSETENV '{' envlist '}' {
136: $$.options = 0;
1.1 tedu 137: $$.envlist = $3.envlist;
138: } ;
139:
140: envlist: /* empty */ {
141: if (!($$.envlist = calloc(1, sizeof(char *))))
142: errx(1, "can't allocate envlist");
143: } | envlist TSTRING {
144: int nenv = arraylen($1.envlist);
1.6 benno 145: if (!($$.envlist = reallocarray($1.envlist, nenv + 2,
146: sizeof(char *))))
1.1 tedu 147: errx(1, "can't allocate envlist");
148: $$.envlist[nenv] = $2.str;
149: $$.envlist[nenv + 1] = NULL;
1.18 tedu 150: }
1.16 djm 151:
152:
1.1 tedu 153: ident: TSTRING {
154: $$.str = $1.str;
155: } ;
156:
157: target: /* optional */ {
158: $$.str = NULL;
159: } | TAS TSTRING {
160: $$.str = $2.str;
161: } ;
162:
163: cmd: /* optional */ {
1.7 zhuk 164: $$.cmd = NULL;
165: $$.cmdargs = NULL;
166: } | TCMD TSTRING args {
167: $$.cmd = $2.str;
168: $$.cmdargs = $3.cmdargs;
169: } ;
170:
171: args: /* empty */ {
172: $$.cmdargs = NULL;
173: } | TARGS argslist {
174: $$.cmdargs = $2.cmdargs;
175: } ;
176:
177: argslist: /* empty */ {
178: if (!($$.cmdargs = calloc(1, sizeof(char *))))
179: errx(1, "can't allocate args");
180: } | argslist TSTRING {
181: int nargs = arraylen($1.cmdargs);
1.11 deraadt 182: if (!($$.cmdargs = reallocarray($1.cmdargs, nargs + 2,
183: sizeof(char *))))
1.7 zhuk 184: errx(1, "can't allocate args");
185: $$.cmdargs[nargs] = $2.str;
186: $$.cmdargs[nargs + 1] = NULL;
1.1 tedu 187: } ;
188:
189: %%
190:
191: void
192: yyerror(const char *fmt, ...)
193: {
194: va_list va;
195:
1.15 gsoares 196: fprintf(stderr, "doas: ");
1.1 tedu 197: va_start(va, fmt);
1.10 zhuk 198: vfprintf(stderr, fmt, va);
199: va_end(va);
200: fprintf(stderr, " at line %d\n", yylval.lineno + 1);
201: parse_errors++;
1.1 tedu 202: }
203:
204: struct keyword {
205: const char *word;
206: int token;
207: } keywords[] = {
208: { "deny", TDENY },
209: { "permit", TPERMIT },
210: { "as", TAS },
211: { "cmd", TCMD },
1.7 zhuk 212: { "args", TARGS },
1.1 tedu 213: { "nopass", TNOPASS },
1.20 ! tedu 214: { "persist", TPERSIST },
1.1 tedu 215: { "keepenv", TKEEPENV },
1.19 tedu 216: { "setenv", TSETENV },
1.1 tedu 217: };
218:
219: int
220: yylex(void)
221: {
222: char buf[1024], *ebuf, *p, *str;
1.10 zhuk 223: int i, c, quotes = 0, escape = 0, qpos = -1, nonkw = 0;
1.1 tedu 224:
225: p = buf;
226: ebuf = buf + sizeof(buf);
1.9 zhuk 227:
1.5 benno 228: repeat:
1.9 zhuk 229: /* skip whitespace first */
230: for (c = getc(yyfp); c == ' ' || c == '\t'; c = getc(yyfp))
1.10 zhuk 231: yylval.colno++;
1.9 zhuk 232:
233: /* check for special one-character constructions */
1.1 tedu 234: switch (c) {
1.9 zhuk 235: case '\n':
1.10 zhuk 236: yylval.colno = 0;
237: yylval.lineno++;
1.9 zhuk 238: /* FALLTHROUGH */
239: case '{':
240: case '}':
241: return c;
242: case '#':
243: /* skip comments; NUL is allowed; no continuation */
244: while ((c = getc(yyfp)) != '\n')
245: if (c == EOF)
1.14 tedu 246: goto eof;
1.10 zhuk 247: yylval.colno = 0;
248: yylval.lineno++;
1.9 zhuk 249: return c;
250: case EOF:
1.14 tedu 251: goto eof;
1.1 tedu 252: }
1.9 zhuk 253:
254: /* parsing next word */
1.10 zhuk 255: for (;; c = getc(yyfp), yylval.colno++) {
1.3 zhuk 256: switch (c) {
1.9 zhuk 257: case '\0':
1.11 deraadt 258: yyerror("unallowed character NUL in column %d",
259: yylval.colno + 1);
1.9 zhuk 260: escape = 0;
261: continue;
262: case '\\':
263: escape = !escape;
264: if (escape)
265: continue;
266: break;
1.3 zhuk 267: case '\n':
1.9 zhuk 268: if (quotes)
1.10 zhuk 269: yyerror("unterminated quotes in column %d",
270: qpos + 1);
1.9 zhuk 271: if (escape) {
272: nonkw = 1;
273: escape = 0;
1.12 mikeb 274: yylval.colno = 0;
275: yylval.lineno++;
1.9 zhuk 276: continue;
277: }
278: goto eow;
279: case EOF:
280: if (escape)
1.10 zhuk 281: yyerror("unterminated escape in column %d",
282: yylval.colno);
1.9 zhuk 283: if (quotes)
1.10 zhuk 284: yyerror("unterminated quotes in column %d",
285: qpos + 1);
286: goto eow;
1.9 zhuk 287: /* FALLTHROUGH */
1.3 zhuk 288: case '{':
289: case '}':
290: case '#':
291: case ' ':
292: case '\t':
1.9 zhuk 293: if (!escape && !quotes)
294: goto eow;
295: break;
296: case '"':
297: if (!escape) {
298: quotes = !quotes;
299: if (quotes) {
300: nonkw = 1;
1.10 zhuk 301: qpos = yylval.colno;
1.9 zhuk 302: }
303: continue;
304: }
1.3 zhuk 305: }
1.1 tedu 306: *p++ = c;
1.13 tedu 307: if (p == ebuf) {
1.10 zhuk 308: yyerror("too long line");
1.13 tedu 309: p = buf;
310: }
1.9 zhuk 311: escape = 0;
1.1 tedu 312: }
1.9 zhuk 313:
1.3 zhuk 314: eow:
1.1 tedu 315: *p = 0;
316: if (c != EOF)
317: ungetc(c, yyfp);
1.9 zhuk 318: if (p == buf) {
319: /*
1.11 deraadt 320: * There could be a number of reasons for empty buffer,
321: * and we handle all of them here, to avoid cluttering
322: * the main loop.
1.9 zhuk 323: */
324: if (c == EOF)
1.14 tedu 325: goto eof;
1.10 zhuk 326: else if (qpos == -1) /* accept, e.g., empty args: cmd foo args "" */
1.9 zhuk 327: goto repeat;
328: }
329: if (!nonkw) {
330: for (i = 0; i < sizeof(keywords) / sizeof(keywords[0]); i++) {
331: if (strcmp(buf, keywords[i].word) == 0)
332: return keywords[i].token;
333: }
1.1 tedu 334: }
335: if ((str = strdup(buf)) == NULL)
336: err(1, "strdup");
337: yylval.str = str;
338: return TSTRING;
1.14 tedu 339:
340: eof:
341: if (ferror(yyfp))
342: yyerror("input error reading config");
343: return 0;
1.1 tedu 344: }