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b406b51da0684490de642b8fc189f696cf347b23
sudo/plugins/sudoers/toke.l
Todd C. Miller 8a7ac44590 Fix #includedir; from Mike Frysinger
2012-05-17 15:42:57 -04:00

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%{
/*
* Copyright (c) 1996, 1998-2005, 2007-2012
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
# include <malloc.h>
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
#include <errno.h>
#include <ctype.h>
#include "sudoers.h"
#include "parse.h"
#include "toke.h"
#include <gram.h>
#include "lbuf.h"
#include "secure_path.h"
extern YYSTYPE yylval;
extern bool parse_error;
extern bool sudoers_warnings;
int sudolineno;
int last_token;
char *sudoers;
/* Default sudoers path, mode and owner (may be set via sudo.conf) */
const char *sudoers_file = _PATH_SUDOERS;
mode_t sudoers_mode = SUDOERS_MODE;
uid_t sudoers_uid = SUDOERS_UID;
gid_t sudoers_gid = SUDOERS_GID;
static bool continued, sawspace;
static int prev_state;
static bool _push_include(char *, bool);
static bool pop_include(void);
static char *parse_include(char *);
static int sudoers_trace_print(const char *msg);
int (*trace_print)(const char *msg) = sudoers_trace_print;
#define LEXRETURN(n) do { \
last_token = (n); \
return (n); \
} while (0)
#define ECHO ignore_result(fwrite(yytext, yyleng, 1, yyout))
#define push_include(_p) (_push_include((_p), false))
#define push_includedir(_p) (_push_include((_p), true))
%}
HEX16 [0-9A-Fa-f]{1,4}
OCTET (1?[0-9]{1,2})|(2[0-4][0-9])|(25[0-5])
IPV4ADDR {OCTET}(\.{OCTET}){3}
IPV6ADDR ({HEX16}?:){2,7}{HEX16}?|({HEX16}?:){2,6}:{IPV4ADDR}
HOSTNAME [[:alnum:]_-]+
WORD ([^#>!=:,\(\) \t\n\\\"]|\\[^\n])+
ID #-?[0-9]+
PATH \/(\\[\,:= \t#]|[^\,:=\\ \t\n#])+
ENVAR ([^#!=, \t\n\\\"]|\\[^\n])([^#=, \t\n\\\"]|\\[^\n])*
DEFVAR [a-z_]+
%option noinput
%option nounput
%option noyywrap
%s GOTDEFS
%x GOTCMND
%x STARTDEFS
%x INDEFS
%x INSTR
%%
<GOTDEFS>[[:blank:]]*,[[:blank:]]* {
LEXTRACE(", ");
LEXRETURN(',');
} /* return ',' */
<GOTDEFS>[[:blank:]]+ BEGIN STARTDEFS;
<STARTDEFS>{DEFVAR} {
BEGIN INDEFS;
LEXTRACE("DEFVAR ");
if (!fill(yytext, yyleng))
yyterminate();
LEXRETURN(DEFVAR);
}
<INDEFS>{
, {
BEGIN STARTDEFS;
LEXTRACE(", ");
LEXRETURN(',');
} /* return ',' */
= {
LEXTRACE("= ");
LEXRETURN('=');
} /* return '=' */
\+= {
LEXTRACE("+= ");
LEXRETURN('+');
} /* return '+' */
-= {
LEXTRACE("-= ");
LEXRETURN('-');
} /* return '-' */
\" {
LEXTRACE("BEGINSTR ");
yylval.string = NULL;
prev_state = YY_START;
BEGIN INSTR;
}
{ENVAR} {
LEXTRACE("WORD(2) ");
if (!fill(yytext, yyleng))
yyterminate();
LEXRETURN(WORD);
}
}
<INSTR>{
\\[[:blank:]]*\n[[:blank:]]* {
/* Line continuation char followed by newline. */
sudolineno++;
continued = true;
}
\" {
LEXTRACE("ENDSTR ");
BEGIN prev_state;
if (yylval.string == NULL) {
LEXTRACE("ERROR "); /* empty string */
LEXRETURN(ERROR);
}
if (prev_state == INITIAL) {
switch (yylval.string[0]) {
case '%':
if (yylval.string[1] == '\0' ||
(yylval.string[1] == ':' &&
yylval.string[2] == '\0')) {
LEXTRACE("ERROR "); /* empty group */
LEXRETURN(ERROR);
}
LEXTRACE("USERGROUP ");
LEXRETURN(USERGROUP);
case '+':
if (yylval.string[1] == '\0') {
LEXTRACE("ERROR "); /* empty netgroup */
LEXRETURN(ERROR);
}
LEXTRACE("NETGROUP ");
LEXRETURN(NETGROUP);
}
}
LEXTRACE("WORD(4) ");
LEXRETURN(WORD);
}
\\ {
LEXTRACE("BACKSLASH ");
if (!append(yytext, yyleng))
yyterminate();
}
([^\"\n\\]|\\\")+ {
LEXTRACE("STRBODY ");
if (!append(yytext, yyleng))
yyterminate();
}
}
<GOTCMND>{
\\[\*\?\[\]\!] {
/* quoted fnmatch glob char, pass verbatim */
LEXTRACE("QUOTEDCHAR ");
if (!fill_args(yytext, 2, sawspace))
yyterminate();
sawspace = false;
}
\\[:\\,= \t#] {
/* quoted sudoers special char, strip backslash */
LEXTRACE("QUOTEDCHAR ");
if (!fill_args(yytext + 1, 1, sawspace))
yyterminate();
sawspace = false;
}
[#:\,=\n] {
BEGIN INITIAL;
yyless(0);
LEXRETURN(COMMAND);
} /* end of command line args */
[^#\\:, \t\n]+ {
LEXTRACE("ARG ");
if (!fill_args(yytext, yyleng, sawspace))
yyterminate();
sawspace = false;
} /* a command line arg */
}
<INITIAL>^#include[[:blank:]]+.*\n {
char *path;
if (continued) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
if ((path = parse_include(yytext)) == NULL)
yyterminate();
LEXTRACE("INCLUDE\n");
/* Push current buffer and switch to include file */
if (!push_include(path))
yyterminate();
}
<INITIAL>^#includedir[[:blank:]]+.*\n {
char *path;
if (continued) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
if ((path = parse_include(yytext)) == NULL)
yyterminate();
LEXTRACE("INCLUDEDIR\n");
/*
* Push current buffer and switch to include file.
* We simply ignore empty directories.
*/
if (!push_includedir(path) && parse_error)
yyterminate();
}
<INITIAL>^[[:blank:]]*Defaults([:@>\!][[:blank:]]*\!*\"?({ID}|{WORD}))? {
char deftype;
int n;
if (continued) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
for (n = 0; isblank((unsigned char)yytext[n]); n++)
continue;
n += sizeof("Defaults") - 1;
if ((deftype = yytext[n++]) != '\0') {
while (isblank((unsigned char)yytext[n]))
n++;
}
BEGIN GOTDEFS;
switch (deftype) {
case ':':
yyless(n);
LEXTRACE("DEFAULTS_USER ");
LEXRETURN(DEFAULTS_USER);
case '>':
yyless(n);
LEXTRACE("DEFAULTS_RUNAS ");
LEXRETURN(DEFAULTS_RUNAS);
case '@':
yyless(n);
LEXTRACE("DEFAULTS_HOST ");
LEXRETURN(DEFAULTS_HOST);
case '!':
yyless(n);
LEXTRACE("DEFAULTS_CMND ");
LEXRETURN(DEFAULTS_CMND);
default:
LEXTRACE("DEFAULTS ");
LEXRETURN(DEFAULTS);
}
}
<INITIAL>^[[:blank:]]*(Host|Cmnd|User|Runas)_Alias {
int n;
if (continued) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
for (n = 0; isblank((unsigned char)yytext[n]); n++)
continue;
switch (yytext[n]) {
case 'H':
LEXTRACE("HOSTALIAS ");
LEXRETURN(HOSTALIAS);
case 'C':
LEXTRACE("CMNDALIAS ");
LEXRETURN(CMNDALIAS);
case 'U':
LEXTRACE("USERALIAS ");
LEXRETURN(USERALIAS);
case 'R':
LEXTRACE("RUNASALIAS ");
LEXRETURN(RUNASALIAS);
}
}
NOPASSWD[[:blank:]]*: {
/* cmnd does not require passwd for this user */
LEXTRACE("NOPASSWD ");
LEXRETURN(NOPASSWD);
}
PASSWD[[:blank:]]*: {
/* cmnd requires passwd for this user */
LEXTRACE("PASSWD ");
LEXRETURN(PASSWD);
}
NOEXEC[[:blank:]]*: {
LEXTRACE("NOEXEC ");
LEXRETURN(NOEXEC);
}
EXEC[[:blank:]]*: {
LEXTRACE("EXEC ");
LEXRETURN(EXEC);
}
SETENV[[:blank:]]*: {
LEXTRACE("SETENV ");
LEXRETURN(SETENV);
}
NOSETENV[[:blank:]]*: {
LEXTRACE("NOSETENV ");
LEXRETURN(NOSETENV);
}
LOG_OUTPUT[[:blank:]]*: {
LEXTRACE("LOG_OUTPUT ");
LEXRETURN(LOG_OUTPUT);
}
NOLOG_OUTPUT[[:blank:]]*: {
LEXTRACE("NOLOG_OUTPUT ");
LEXRETURN(NOLOG_OUTPUT);
}
LOG_INPUT[[:blank:]]*: {
LEXTRACE("LOG_INPUT ");
LEXRETURN(LOG_INPUT);
}
NOLOG_INPUT[[:blank:]]*: {
LEXTRACE("NOLOG_INPUT ");
LEXRETURN(NOLOG_INPUT);
}
<INITIAL,GOTDEFS>(\+|\%|\%:) {
/* empty group or netgroup */
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
\+{WORD} {
/* netgroup */
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("NETGROUP ");
LEXRETURN(NETGROUP);
}
\%:?({WORD}|{ID}) {
/* group */
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("USERGROUP ");
LEXRETURN(USERGROUP);
}
{IPV4ADDR}(\/{IPV4ADDR})? {
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("NTWKADDR ");
LEXRETURN(NTWKADDR);
}
{IPV4ADDR}\/([12]?[0-9]|3[0-2]) {
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("NTWKADDR ");
LEXRETURN(NTWKADDR);
}
{IPV6ADDR}(\/{IPV6ADDR})? {
if (!ipv6_valid(yytext)) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("NTWKADDR ");
LEXRETURN(NTWKADDR);
}
{IPV6ADDR}\/([0-9]|[1-9][0-9]|1[01][0-9]|12[0-8]) {
if (!ipv6_valid(yytext)) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("NTWKADDR ");
LEXRETURN(NTWKADDR);
}
ALL {
LEXTRACE("ALL ");
LEXRETURN(ALL);
}
<INITIAL>ROLE {
#ifdef HAVE_SELINUX
LEXTRACE("ROLE ");
LEXRETURN(ROLE);
#else
goto got_alias;
#endif
}
<INITIAL>TYPE {
#ifdef HAVE_SELINUX
LEXTRACE("TYPE ");
LEXRETURN(TYPE);
#else
goto got_alias;
#endif
}
[[:upper:]][[:upper:][:digit:]_]* {
#ifndef HAVE_SELINUX
got_alias:
#endif
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("ALIAS ");
LEXRETURN(ALIAS);
}
<GOTDEFS>({PATH}|sudoedit) {
/* no command args allowed for Defaults!/path */
if (!fill_cmnd(yytext, yyleng))
yyterminate();
LEXTRACE("COMMAND ");
LEXRETURN(COMMAND);
}
sudoedit {
BEGIN GOTCMND;
LEXTRACE("COMMAND ");
if (!fill_cmnd(yytext, yyleng))
yyterminate();
} /* sudo -e */
{PATH} {
/* directories can't have args... */
if (yytext[yyleng - 1] == '/') {
LEXTRACE("COMMAND ");
if (!fill_cmnd(yytext, yyleng))
yyterminate();
LEXRETURN(COMMAND);
} else {
BEGIN GOTCMND;
LEXTRACE("COMMAND ");
if (!fill_cmnd(yytext, yyleng))
yyterminate();
}
} /* a pathname */
<INITIAL,GOTDEFS>\" {
LEXTRACE("BEGINSTR ");
yylval.string = NULL;
prev_state = YY_START;
BEGIN INSTR;
}
<INITIAL,GOTDEFS>({ID}|{WORD}) {
/* a word */
if (!fill(yytext, yyleng))
yyterminate();
LEXTRACE("WORD(5) ");
LEXRETURN(WORD);
}
\( {
LEXTRACE("( ");
LEXRETURN('(');
}
\) {
LEXTRACE(") ");
LEXRETURN(')');
}
, {
LEXTRACE(", ");
LEXRETURN(',');
} /* return ',' */
= {
LEXTRACE("= ");
LEXRETURN('=');
} /* return '=' */
: {
LEXTRACE(": ");
LEXRETURN(':');
} /* return ':' */
<*>!+ {
if (yyleng & 1) {
LEXTRACE("!");
LEXRETURN('!'); /* return '!' */
}
}
<*>\n {
if (YY_START == INSTR) {
LEXTRACE("ERROR ");
LEXRETURN(ERROR); /* line break in string */
}
BEGIN INITIAL;
sudolineno++;
continued = false;
LEXTRACE("\n");
LEXRETURN(COMMENT);
} /* return newline */
<*>[[:blank:]]+ { /* throw away space/tabs */
sawspace = true; /* but remember for fill_args */
}
<*>\\[[:blank:]]*\n {
sawspace = true; /* remember for fill_args */
sudolineno++;
continued = true;
} /* throw away EOL after \ */
<INITIAL,STARTDEFS,INDEFS>#(-[^\n0-9].*|[^\n0-9-].*)?\n {
BEGIN INITIAL;
sudolineno++;
continued = false;
LEXTRACE("#\n");
LEXRETURN(COMMENT);
} /* comment, not uid/gid */
<*>. {
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
} /* parse error */
<*><<EOF>> {
if (YY_START != INITIAL) {
BEGIN INITIAL;
LEXTRACE("ERROR ");
LEXRETURN(ERROR);
}
if (!pop_include())
yyterminate();
}
%%
struct path_list {
char *path;
struct path_list *next;
};
struct include_stack {
YY_BUFFER_STATE bs;
char *path;
struct path_list *more; /* more files in case of includedir */
int lineno;
bool keepopen;
};
static int
pl_compare(const void *v1, const void *v2)
{
const struct path_list * const *p1 = v1;
const struct path_list * const *p2 = v2;
return strcmp((*p1)->path, (*p2)->path);
}
static char *
switch_dir(struct include_stack *stack, char *dirpath)
{
DIR *dir;
int i, count = 0;
char *path = NULL;
struct dirent *dent;
struct stat sb;
struct path_list *pl, *first = NULL;
struct path_list **sorted = NULL;
debug_decl(switch_dir, SUDO_DEBUG_PARSER)
if (!(dir = opendir(dirpath))) {
if (errno != ENOENT) {
char *errbuf;
if (asprintf(&errbuf, _("%s: %s"), dirpath, strerror(errno)) != -1) {
yyerror(errbuf);
free(errbuf);
} else {
yyerror(_("unable to allocate memory"));
}
}
goto done;
}
while ((dent = readdir(dir))) {
/* Ignore files that end in '~' or have a '.' in them. */
if (dent->d_name[0] == '\0' || dent->d_name[NAMLEN(dent) - 1] == '~'
|| strchr(dent->d_name, '.') != NULL) {
continue;
}
if (asprintf(&path, "%s/%s", dirpath, dent->d_name) == -1) {
closedir(dir);
goto bad;
}
if (stat(path, &sb) != 0 || !S_ISREG(sb.st_mode)) {
efree(path);
path = NULL;
continue;
}
pl = malloc(sizeof(*pl));
if (pl == NULL)
goto bad;
pl->path = path;
pl->next = first;
first = pl;
count++;
}
closedir(dir);
if (count == 0)
goto done;
/* Sort the list as an array. */
sorted = malloc(sizeof(*sorted) * count);
if (sorted == NULL)
goto bad;
pl = first;
for (i = 0; i < count; i++) {
sorted[i] = pl;
pl = pl->next;
}
qsort(sorted, count, sizeof(*sorted), pl_compare);
/* Apply sorting to the list. */
first = sorted[0];
sorted[count - 1]->next = NULL;
for (i = 1; i < count; i++)
sorted[i - 1]->next = sorted[i];
efree(sorted);
/* Pull out the first element for parsing, leave the rest for later. */
if (count) {
path = first->path;
pl = first->next;
efree(first);
stack->more = pl;
} else {
path = NULL;
}
done:
efree(dirpath);
debug_return_str(path);
bad:
while (first != NULL) {
pl = first;
first = pl->next;
free(pl->path);
free(pl);
}
efree(sorted);
efree(dirpath);
efree(path);
debug_return_str(NULL);
}
#define MAX_SUDOERS_DEPTH 128
#define SUDOERS_STACK_INCREMENT 16
static size_t istacksize, idepth;
static struct include_stack *istack;
static bool keepopen;
void
init_lexer(void)
{
struct path_list *pl;
debug_decl(init_lexer, SUDO_DEBUG_PARSER)
while (idepth) {
idepth--;
while ((pl = istack[idepth].more) != NULL) {
istack[idepth].more = pl->next;
efree(pl->path);
efree(pl);
}
efree(istack[idepth].path);
if (idepth && !istack[idepth].keepopen)
fclose(istack[idepth].bs->yy_input_file);
yy_delete_buffer(istack[idepth].bs);
}
efree(istack);
istack = NULL;
istacksize = idepth = 0;
sudolineno = 1;
keepopen = false;
sawspace = false;
continued = false;
prev_state = INITIAL;
debug_return;
}
static bool
_push_include(char *path, bool isdir)
{
struct path_list *pl;
FILE *fp;
debug_decl(_push_include, SUDO_DEBUG_PARSER)
/* push current state onto stack */
if (idepth >= istacksize) {
if (idepth > MAX_SUDOERS_DEPTH) {
yyerror(_("too many levels of includes"));
debug_return_bool(false);
}
istacksize += SUDOERS_STACK_INCREMENT;
istack = (struct include_stack *) realloc(istack,
sizeof(*istack) * istacksize);
if (istack == NULL) {
yyerror(_("unable to allocate memory"));
debug_return_bool(false);
}
}
if (isdir) {
struct stat sb;
switch (sudo_secure_dir(path, sudoers_uid, sudoers_gid, &sb)) {
case SUDO_PATH_SECURE:
break;
case SUDO_PATH_MISSING:
debug_return_bool(false);
case SUDO_PATH_BAD_TYPE:
errno = ENOTDIR;
if (sudoers_warnings) {
warning("%s", path);
}
debug_return_bool(false);
case SUDO_PATH_WRONG_OWNER:
if (sudoers_warnings) {
warningx(_("%s is owned by uid %u, should be %u"),
path, (unsigned int) sb.st_uid,
(unsigned int) sudoers_uid);
}
debug_return_bool(false);
case SUDO_PATH_WORLD_WRITABLE:
if (sudoers_warnings) {
warningx(_("%s is world writable"), path);
}
debug_return_bool(false);
case SUDO_PATH_GROUP_WRITABLE:
if (sudoers_warnings) {
warningx(_("%s is owned by gid %u, should be %u"),
path, (unsigned int) sb.st_gid,
(unsigned int) sudoers_gid);
}
debug_return_bool(false);
default:
/* NOTREACHED */
debug_return_bool(false);
}
if (!(path = switch_dir(&istack[idepth], path))) {
/* switch_dir() called yyerror() for us */
debug_return_bool(false);
}
while ((fp = open_sudoers(path, false, &keepopen)) == NULL) {
/* Unable to open path in includedir, go to next one, if any. */
efree(path);
if ((pl = istack[idepth].more) == NULL)
debug_return_bool(false);
path = pl->path;
istack[idepth].more = pl->next;
efree(pl);
}
} else {
if ((fp = open_sudoers(path, true, &keepopen)) == NULL) {
char *errbuf;
if (asprintf(&errbuf, _("%s: %s"), path, strerror(errno)) != -1) {
yyerror(errbuf);
free(errbuf);
} else {
yyerror(_("unable to allocate memory"));
}
debug_return_bool(false);
}
istack[idepth].more = NULL;
}
/* Push the old (current) file and open the new one. */
istack[idepth].path = sudoers; /* push old path */
istack[idepth].bs = YY_CURRENT_BUFFER;
istack[idepth].lineno = sudolineno;
istack[idepth].keepopen = keepopen;
idepth++;
sudolineno = 1;
sudoers = path;
yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
debug_return_bool(true);
}
static bool
pop_include(void)
{
struct path_list *pl;
FILE *fp;
debug_decl(pop_include, SUDO_DEBUG_PARSER)
if (idepth == 0)
debug_return_bool(false);
if (!keepopen)
fclose(YY_CURRENT_BUFFER->yy_input_file);
yy_delete_buffer(YY_CURRENT_BUFFER);
/* If we are in an include dir, move to the next file. */
while ((pl = istack[idepth - 1].more) != NULL) {
fp = open_sudoers(pl->path, false, &keepopen);
if (fp != NULL) {
istack[idepth - 1].more = pl->next;
efree(sudoers);
sudoers = pl->path;
sudolineno = 1;
yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
efree(pl);
break;
}
/* Unable to open path in include dir, go to next one. */
istack[idepth - 1].more = pl->next;
efree(pl->path);
efree(pl);
}
/* If no path list, just pop the last dir on the stack. */
if (pl == NULL) {
idepth--;
yy_switch_to_buffer(istack[idepth].bs);
efree(sudoers);
sudoers = istack[idepth].path;
sudolineno = istack[idepth].lineno;
keepopen = istack[idepth].keepopen;
}
debug_return_bool(true);
}
static char *
parse_include(char *base)
{
char *cp, *ep, *path, *pp;
int dirlen = 0, len = 0, subst = 0;
size_t shost_len = 0;
debug_decl(parse_include, SUDO_DEBUG_PARSER)
/* Pull out path from #include line. */
cp = base + sizeof("#include");
if (*cp == 'i')
cp += 3; /* includedir */
while (isblank((unsigned char) *cp))
cp++;
ep = cp;
while (*ep != '\0' && !isspace((unsigned char) *ep)) {
if (ep[0] == '%' && ep[1] == 'h') {
shost_len = strlen(user_shost);
len += shost_len - 2;
subst = 1;
}
ep++;
}
/* Relative paths are located in the same dir as the sudoers file. */
if (*cp != '/') {
char *dirend = strrchr(sudoers, '/');
if (dirend != NULL)
dirlen = (int)(dirend - sudoers) + 1;
}
/* Make a copy of the fully-qualified path and return it. */
len += (int)(ep - cp);
path = pp = malloc(len + dirlen + 1);
if (path == NULL) {
yyerror(_("unable to allocate memory"));
debug_return_str(NULL);
}
if (dirlen) {
memcpy(path, sudoers, dirlen);
pp += dirlen;
}
if (subst) {
/* substitute for %h */
while (cp < ep) {
if (cp[0] == '%' && cp[1] == 'h') {
memcpy(pp, user_shost, shost_len);
pp += shost_len;
cp += 2;
continue;
}
*pp++ = *cp++;
}
*pp = '\0';
} else {
memcpy(pp, cp, len);
pp[len] = '\0';
}
/* Push any excess characters (e.g. comment, newline) back to the lexer */
if (*ep != '\0')
yyless((int)(ep - base));
debug_return_str(path);
}
#ifdef TRACELEXER
static int
sudoers_trace_print(const char *msg)
{
return fputs(msg, stderr);
}
#else
static int
sudoers_trace_print(const char *msg)
{
static bool initialized;
static struct lbuf lbuf;
if (!initialized) {
initialized = true;
lbuf_init(&lbuf, NULL, 0, NULL, 0);
}
lbuf_append(&lbuf, "%s", msg);
/* XXX - assumes a final newline */
if (strchr(msg, '\n') != NULL)
{
sudo_debug_printf2(NULL, NULL, 0, SUDO_DEBUG_PARSER|SUDO_DEBUG_DEBUG,
"%s:%d %s", sudoers, sudolineno, lbuf.buf);
lbuf.len = 0;
}
return 0;
}
#endif /* TRACELEXER */
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