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1.19 ! tedu 1: /* $OpenBSD: parse.y,v 1.18 2016/06/07 16:49:23 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
1.19 ! tedu 60: %token TNOPASS 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;
1.1 tedu 122: } | TKEEPENV {
123: $$.options = KEEPENV;
1.19 ! tedu 124: $$.envlist = NULL;
1.1 tedu 125: } | TKEEPENV '{' envlist '}' {
1.19 ! tedu 126: $$.options = 0;
! 127: if (!obsolete_warned) {
! 128: warnx("keepenv with list is obsolete");
! 129: obsolete_warned = 1;
! 130: }
! 131: $$.envlist = $3.envlist;
! 132: } | TSETENV '{' envlist '}' {
! 133: $$.options = 0;
1.1 tedu 134: $$.envlist = $3.envlist;
135: } ;
136:
137: envlist: /* empty */ {
138: if (!($$.envlist = calloc(1, sizeof(char *))))
139: errx(1, "can't allocate envlist");
140: } | envlist TSTRING {
141: int nenv = arraylen($1.envlist);
1.6 benno 142: if (!($$.envlist = reallocarray($1.envlist, nenv + 2,
143: sizeof(char *))))
1.1 tedu 144: errx(1, "can't allocate envlist");
145: $$.envlist[nenv] = $2.str;
146: $$.envlist[nenv + 1] = NULL;
1.18 tedu 147: }
1.16 djm 148:
149:
1.1 tedu 150: ident: TSTRING {
151: $$.str = $1.str;
152: } ;
153:
154: target: /* optional */ {
155: $$.str = NULL;
156: } | TAS TSTRING {
157: $$.str = $2.str;
158: } ;
159:
160: cmd: /* optional */ {
1.7 zhuk 161: $$.cmd = NULL;
162: $$.cmdargs = NULL;
163: } | TCMD TSTRING args {
164: $$.cmd = $2.str;
165: $$.cmdargs = $3.cmdargs;
166: } ;
167:
168: args: /* empty */ {
169: $$.cmdargs = NULL;
170: } | TARGS argslist {
171: $$.cmdargs = $2.cmdargs;
172: } ;
173:
174: argslist: /* empty */ {
175: if (!($$.cmdargs = calloc(1, sizeof(char *))))
176: errx(1, "can't allocate args");
177: } | argslist TSTRING {
178: int nargs = arraylen($1.cmdargs);
1.11 deraadt 179: if (!($$.cmdargs = reallocarray($1.cmdargs, nargs + 2,
180: sizeof(char *))))
1.7 zhuk 181: errx(1, "can't allocate args");
182: $$.cmdargs[nargs] = $2.str;
183: $$.cmdargs[nargs + 1] = NULL;
1.1 tedu 184: } ;
185:
186: %%
187:
188: void
189: yyerror(const char *fmt, ...)
190: {
191: va_list va;
192:
1.15 gsoares 193: fprintf(stderr, "doas: ");
1.1 tedu 194: va_start(va, fmt);
1.10 zhuk 195: vfprintf(stderr, fmt, va);
196: va_end(va);
197: fprintf(stderr, " at line %d\n", yylval.lineno + 1);
198: parse_errors++;
1.1 tedu 199: }
200:
201: struct keyword {
202: const char *word;
203: int token;
204: } keywords[] = {
205: { "deny", TDENY },
206: { "permit", TPERMIT },
207: { "as", TAS },
208: { "cmd", TCMD },
1.7 zhuk 209: { "args", TARGS },
1.1 tedu 210: { "nopass", TNOPASS },
211: { "keepenv", TKEEPENV },
1.19 ! tedu 212: { "setenv", TSETENV },
1.1 tedu 213: };
214:
215: int
216: yylex(void)
217: {
218: char buf[1024], *ebuf, *p, *str;
1.10 zhuk 219: int i, c, quotes = 0, escape = 0, qpos = -1, nonkw = 0;
1.1 tedu 220:
221: p = buf;
222: ebuf = buf + sizeof(buf);
1.9 zhuk 223:
1.5 benno 224: repeat:
1.9 zhuk 225: /* skip whitespace first */
226: for (c = getc(yyfp); c == ' ' || c == '\t'; c = getc(yyfp))
1.10 zhuk 227: yylval.colno++;
1.9 zhuk 228:
229: /* check for special one-character constructions */
1.1 tedu 230: switch (c) {
1.9 zhuk 231: case '\n':
1.10 zhuk 232: yylval.colno = 0;
233: yylval.lineno++;
1.9 zhuk 234: /* FALLTHROUGH */
235: case '{':
236: case '}':
237: return c;
238: case '#':
239: /* skip comments; NUL is allowed; no continuation */
240: while ((c = getc(yyfp)) != '\n')
241: if (c == EOF)
1.14 tedu 242: goto eof;
1.10 zhuk 243: yylval.colno = 0;
244: yylval.lineno++;
1.9 zhuk 245: return c;
246: case EOF:
1.14 tedu 247: goto eof;
1.1 tedu 248: }
1.9 zhuk 249:
250: /* parsing next word */
1.10 zhuk 251: for (;; c = getc(yyfp), yylval.colno++) {
1.3 zhuk 252: switch (c) {
1.9 zhuk 253: case '\0':
1.11 deraadt 254: yyerror("unallowed character NUL in column %d",
255: yylval.colno + 1);
1.9 zhuk 256: escape = 0;
257: continue;
258: case '\\':
259: escape = !escape;
260: if (escape)
261: continue;
262: break;
1.3 zhuk 263: case '\n':
1.9 zhuk 264: if (quotes)
1.10 zhuk 265: yyerror("unterminated quotes in column %d",
266: qpos + 1);
1.9 zhuk 267: if (escape) {
268: nonkw = 1;
269: escape = 0;
1.12 mikeb 270: yylval.colno = 0;
271: yylval.lineno++;
1.9 zhuk 272: continue;
273: }
274: goto eow;
275: case EOF:
276: if (escape)
1.10 zhuk 277: yyerror("unterminated escape in column %d",
278: yylval.colno);
1.9 zhuk 279: if (quotes)
1.10 zhuk 280: yyerror("unterminated quotes in column %d",
281: qpos + 1);
282: goto eow;
1.9 zhuk 283: /* FALLTHROUGH */
1.3 zhuk 284: case '{':
285: case '}':
286: case '#':
287: case ' ':
288: case '\t':
1.9 zhuk 289: if (!escape && !quotes)
290: goto eow;
291: break;
292: case '"':
293: if (!escape) {
294: quotes = !quotes;
295: if (quotes) {
296: nonkw = 1;
1.10 zhuk 297: qpos = yylval.colno;
1.9 zhuk 298: }
299: continue;
300: }
1.3 zhuk 301: }
1.1 tedu 302: *p++ = c;
1.13 tedu 303: if (p == ebuf) {
1.10 zhuk 304: yyerror("too long line");
1.13 tedu 305: p = buf;
306: }
1.9 zhuk 307: escape = 0;
1.1 tedu 308: }
1.9 zhuk 309:
1.3 zhuk 310: eow:
1.1 tedu 311: *p = 0;
312: if (c != EOF)
313: ungetc(c, yyfp);
1.9 zhuk 314: if (p == buf) {
315: /*
1.11 deraadt 316: * There could be a number of reasons for empty buffer,
317: * and we handle all of them here, to avoid cluttering
318: * the main loop.
1.9 zhuk 319: */
320: if (c == EOF)
1.14 tedu 321: goto eof;
1.10 zhuk 322: else if (qpos == -1) /* accept, e.g., empty args: cmd foo args "" */
1.9 zhuk 323: goto repeat;
324: }
325: if (!nonkw) {
326: for (i = 0; i < sizeof(keywords) / sizeof(keywords[0]); i++) {
327: if (strcmp(buf, keywords[i].word) == 0)
328: return keywords[i].token;
329: }
1.1 tedu 330: }
331: if ((str = strdup(buf)) == NULL)
332: err(1, "strdup");
333: yylval.str = str;
334: return TSTRING;
1.14 tedu 335:
336: eof:
337: if (ferror(yyfp))
338: yyerror("input error reading config");
339: return 0;
1.1 tedu 340: }