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1.26 ! tedu 1: /* $OpenBSD: parse.y,v 1.25 2016/12/29 19:12:42 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: };
1.26 ! tedu 39: const char **strlist;
1.1 tedu 40: const char *str;
41: };
1.10 zhuk 42: int lineno;
43: int colno;
1.1 tedu 44: } yystype;
45: #define YYSTYPE yystype
46:
47: FILE *yyfp;
48:
49: struct rule **rules;
1.22 deraadt 50: int nrules;
51: static int maxrules;
52:
1.10 zhuk 53: int parse_errors = 0;
1.1 tedu 54:
1.22 deraadt 55: static void yyerror(const char *, ...);
56: static int yylex(void);
1.23 tedu 57:
58: static size_t
59: arraylen(const char **arr)
60: {
61: size_t cnt = 0;
62:
63: while (*arr) {
64: cnt++;
65: arr++;
66: }
67: return cnt;
68: }
1.4 nicm 69:
1.1 tedu 70: %}
71:
1.7 zhuk 72: %token TPERMIT TDENY TAS TCMD TARGS
1.20 tedu 73: %token TNOPASS TPERSIST TKEEPENV TSETENV
1.1 tedu 74: %token TSTRING
75:
76: %%
77:
78: grammar: /* empty */
79: | grammar '\n'
80: | grammar rule '\n'
1.10 zhuk 81: | error '\n'
1.1 tedu 82: ;
83:
84: rule: action ident target cmd {
85: struct rule *r;
86: r = calloc(1, sizeof(*r));
1.2 nicm 87: if (!r)
88: errx(1, "can't allocate rule");
1.1 tedu 89: r->action = $1.action;
90: r->options = $1.options;
91: r->envlist = $1.envlist;
92: r->ident = $2.str;
93: r->target = $3.str;
1.7 zhuk 94: r->cmd = $4.cmd;
95: r->cmdargs = $4.cmdargs;
1.1 tedu 96: if (nrules == maxrules) {
97: if (maxrules == 0)
98: maxrules = 63;
99: else
100: maxrules *= 2;
1.6 benno 101: if (!(rules = reallocarray(rules, maxrules,
102: sizeof(*rules))))
1.1 tedu 103: errx(1, "can't allocate rules");
104: }
105: rules[nrules++] = r;
106: } ;
107:
108: action: TPERMIT options {
109: $$.action = PERMIT;
110: $$.options = $2.options;
111: $$.envlist = $2.envlist;
112: } | TDENY {
113: $$.action = DENY;
1.19 tedu 114: $$.options = 0;
115: $$.envlist = NULL;
1.1 tedu 116: } ;
117:
1.19 tedu 118: options: /* none */ {
119: $$.options = 0;
120: $$.envlist = NULL;
121: } | options option {
1.1 tedu 122: $$.options = $1.options | $2.options;
123: $$.envlist = $1.envlist;
1.21 tedu 124: if (($$.options & (NOPASS|PERSIST)) == (NOPASS|PERSIST)) {
125: yyerror("can't combine nopass and persist");
126: YYERROR;
127: }
1.1 tedu 128: if ($2.envlist) {
1.10 zhuk 129: if ($$.envlist) {
1.19 tedu 130: yyerror("can't have two setenv sections");
1.10 zhuk 131: YYERROR;
132: } else
1.1 tedu 133: $$.envlist = $2.envlist;
134: }
135: } ;
136: option: TNOPASS {
137: $$.options = NOPASS;
1.19 tedu 138: $$.envlist = NULL;
1.20 tedu 139: } | TPERSIST {
140: $$.options = PERSIST;
141: $$.envlist = NULL;
1.1 tedu 142: } | TKEEPENV {
143: $$.options = KEEPENV;
1.19 tedu 144: $$.envlist = NULL;
1.26 ! tedu 145: } | TSETENV '{' strlist '}' {
1.19 tedu 146: $$.options = 0;
1.26 ! tedu 147: $$.envlist = $3.strlist;
1.1 tedu 148: } ;
149:
1.26 ! tedu 150: strlist: /* empty */ {
! 151: if (!($$.strlist = calloc(1, sizeof(char *))))
! 152: errx(1, "can't allocate strlist");
! 153: } | strlist TSTRING {
! 154: int nstr = arraylen($1.strlist);
! 155: if (!($$.strlist = reallocarray($1.strlist, nstr + 2,
1.6 benno 156: sizeof(char *))))
1.26 ! tedu 157: errx(1, "can't allocate strlist");
! 158: $$.strlist[nstr] = $2.str;
! 159: $$.strlist[nstr + 1] = NULL;
1.24 tedu 160: } ;
1.16 djm 161:
162:
1.1 tedu 163: ident: TSTRING {
164: $$.str = $1.str;
165: } ;
166:
167: target: /* optional */ {
168: $$.str = NULL;
169: } | TAS TSTRING {
170: $$.str = $2.str;
171: } ;
172:
173: cmd: /* optional */ {
1.7 zhuk 174: $$.cmd = NULL;
175: $$.cmdargs = NULL;
176: } | TCMD TSTRING args {
177: $$.cmd = $2.str;
178: $$.cmdargs = $3.cmdargs;
179: } ;
180:
181: args: /* empty */ {
182: $$.cmdargs = NULL;
1.26 ! tedu 183: } | TARGS strlist {
! 184: $$.cmdargs = $2.strlist;
1.1 tedu 185: } ;
186:
187: %%
188:
189: void
190: yyerror(const char *fmt, ...)
191: {
192: va_list va;
193:
1.15 gsoares 194: fprintf(stderr, "doas: ");
1.1 tedu 195: va_start(va, fmt);
1.10 zhuk 196: vfprintf(stderr, fmt, va);
197: va_end(va);
198: fprintf(stderr, " at line %d\n", yylval.lineno + 1);
199: parse_errors++;
1.1 tedu 200: }
201:
1.22 deraadt 202: static struct keyword {
1.1 tedu 203: const char *word;
204: int token;
205: } keywords[] = {
206: { "deny", TDENY },
207: { "permit", TPERMIT },
208: { "as", TAS },
209: { "cmd", TCMD },
1.7 zhuk 210: { "args", TARGS },
1.1 tedu 211: { "nopass", TNOPASS },
1.20 tedu 212: { "persist", TPERSIST },
1.1 tedu 213: { "keepenv", TKEEPENV },
1.19 tedu 214: { "setenv", TSETENV },
1.1 tedu 215: };
216:
217: int
218: yylex(void)
219: {
220: char buf[1024], *ebuf, *p, *str;
1.10 zhuk 221: int i, c, quotes = 0, escape = 0, qpos = -1, nonkw = 0;
1.1 tedu 222:
223: p = buf;
224: ebuf = buf + sizeof(buf);
1.9 zhuk 225:
1.5 benno 226: repeat:
1.9 zhuk 227: /* skip whitespace first */
228: for (c = getc(yyfp); c == ' ' || c == '\t'; c = getc(yyfp))
1.10 zhuk 229: yylval.colno++;
1.9 zhuk 230:
231: /* check for special one-character constructions */
1.1 tedu 232: switch (c) {
1.9 zhuk 233: case '\n':
1.10 zhuk 234: yylval.colno = 0;
235: yylval.lineno++;
1.9 zhuk 236: /* FALLTHROUGH */
237: case '{':
238: case '}':
239: return c;
240: case '#':
241: /* skip comments; NUL is allowed; no continuation */
242: while ((c = getc(yyfp)) != '\n')
243: if (c == EOF)
1.14 tedu 244: goto eof;
1.10 zhuk 245: yylval.colno = 0;
246: yylval.lineno++;
1.9 zhuk 247: return c;
248: case EOF:
1.14 tedu 249: goto eof;
1.1 tedu 250: }
1.9 zhuk 251:
252: /* parsing next word */
1.10 zhuk 253: for (;; c = getc(yyfp), yylval.colno++) {
1.3 zhuk 254: switch (c) {
1.9 zhuk 255: case '\0':
1.11 deraadt 256: yyerror("unallowed character NUL in column %d",
257: yylval.colno + 1);
1.9 zhuk 258: escape = 0;
259: continue;
260: case '\\':
261: escape = !escape;
262: if (escape)
263: continue;
264: break;
1.3 zhuk 265: case '\n':
1.9 zhuk 266: if (quotes)
1.10 zhuk 267: yyerror("unterminated quotes in column %d",
268: qpos + 1);
1.9 zhuk 269: if (escape) {
270: nonkw = 1;
271: escape = 0;
1.12 mikeb 272: yylval.colno = 0;
273: yylval.lineno++;
1.9 zhuk 274: continue;
275: }
276: goto eow;
277: case EOF:
278: if (escape)
1.10 zhuk 279: yyerror("unterminated escape in column %d",
280: yylval.colno);
1.9 zhuk 281: if (quotes)
1.10 zhuk 282: yyerror("unterminated quotes in column %d",
283: qpos + 1);
284: goto eow;
1.9 zhuk 285: /* FALLTHROUGH */
1.3 zhuk 286: case '{':
287: case '}':
288: case '#':
289: case ' ':
290: case '\t':
1.9 zhuk 291: if (!escape && !quotes)
292: goto eow;
293: break;
294: case '"':
295: if (!escape) {
296: quotes = !quotes;
297: if (quotes) {
298: nonkw = 1;
1.10 zhuk 299: qpos = yylval.colno;
1.9 zhuk 300: }
301: continue;
302: }
1.3 zhuk 303: }
1.1 tedu 304: *p++ = c;
1.13 tedu 305: if (p == ebuf) {
1.10 zhuk 306: yyerror("too long line");
1.13 tedu 307: p = buf;
308: }
1.9 zhuk 309: escape = 0;
1.1 tedu 310: }
1.9 zhuk 311:
1.3 zhuk 312: eow:
1.1 tedu 313: *p = 0;
314: if (c != EOF)
315: ungetc(c, yyfp);
1.9 zhuk 316: if (p == buf) {
317: /*
1.11 deraadt 318: * There could be a number of reasons for empty buffer,
319: * and we handle all of them here, to avoid cluttering
320: * the main loop.
1.9 zhuk 321: */
322: if (c == EOF)
1.14 tedu 323: goto eof;
1.10 zhuk 324: else if (qpos == -1) /* accept, e.g., empty args: cmd foo args "" */
1.9 zhuk 325: goto repeat;
326: }
327: if (!nonkw) {
328: for (i = 0; i < sizeof(keywords) / sizeof(keywords[0]); i++) {
329: if (strcmp(buf, keywords[i].word) == 0)
330: return keywords[i].token;
331: }
1.1 tedu 332: }
333: if ((str = strdup(buf)) == NULL)
334: err(1, "strdup");
335: yylval.str = str;
336: return TSTRING;
1.14 tedu 337:
338: eof:
339: if (ferror(yyfp))
340: yyerror("input error reading config");
341: return 0;
1.1 tedu 342: }