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-rw-r--r--plugins/sudoers/toke.l1161
1 files changed, 1161 insertions, 0 deletions
diff --git a/plugins/sudoers/toke.l b/plugins/sudoers/toke.l
new file mode 100644
index 0000000..d275a26
--- /dev/null
+++ b/plugins/sudoers/toke.l
@@ -0,0 +1,1161 @@
+%{
+/*
+ * Copyright (c) 1996, 1998-2005, 2007-2017
+ * Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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.
+ *
+ * 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/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+#include <ctype.h>
+#include "sudoers.h"
+#include "toke.h"
+#include <gram.h>
+#include "sudo_digest.h"
+#include "sudo_lbuf.h"
+
+#if defined(HAVE_STRUCT_DIRENT_D_NAMLEN) && HAVE_STRUCT_DIRENT_D_NAMLEN
+# define NAMLEN(dirent) (dirent)->d_namlen
+#else
+# define NAMLEN(dirent) strlen((dirent)->d_name)
+#endif
+
+int sudolineno; /* current sudoers line number. */
+int last_token; /* last token that was parsed. */
+char *sudoers; /* sudoers file being parsed. */
+
+/* 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 int digest_type = -1;
+
+static bool push_include_int(char *, bool);
+static bool pop_include(void);
+static char *parse_include_int(const char *, bool);
+
+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(sudoerstext, sudoersleng, 1, sudoersout))
+
+#define parse_include(_p) (parse_include_int((_p), false))
+#define parse_includedir(_p) (parse_include_int((_p), true))
+#define push_include(_p) (push_include_int((_p), false))
+#define push_includedir(_p) (push_include_int((_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
+%option prefix="sudoers"
+
+%s GOTDEFS
+%x GOTCMND
+%x STARTDEFS
+%x INDEFS
+%x INSTR
+%s WANTDIGEST
+
+%%
+<GOTDEFS>[[:blank:]]*,[[:blank:]]* {
+ LEXTRACE(", ");
+ LEXRETURN(',');
+ } /* return ',' */
+
+<GOTDEFS>[[:blank:]]+ BEGIN STARTDEFS;
+
+<STARTDEFS>{DEFVAR} {
+ BEGIN INDEFS;
+ LEXTRACE("DEFVAR ");
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXRETURN(DEFVAR);
+ }
+
+<INDEFS>{
+ , {
+ BEGIN STARTDEFS;
+ LEXTRACE(", ");
+ LEXRETURN(',');
+ } /* return ',' */
+
+ = {
+ LEXTRACE("= ");
+ LEXRETURN('=');
+ } /* return '=' */
+
+ \+= {
+ LEXTRACE("+= ");
+ LEXRETURN('+');
+ } /* return '+' */
+
+ -= {
+ LEXTRACE("-= ");
+ LEXRETURN('-');
+ } /* return '-' */
+
+ \" {
+ LEXTRACE("BEGINSTR ");
+ sudoerslval.string = NULL;
+ prev_state = YY_START;
+ BEGIN INSTR;
+ }
+
+ {ENVAR} {
+ LEXTRACE("WORD(2) ");
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXRETURN(WORD);
+ }
+}
+
+<INSTR>{
+ \\[[:blank:]]*\n[[:blank:]]* {
+ /* Line continuation char followed by newline. */
+ sudolineno++;
+ continued = true;
+ }
+
+ \" {
+ LEXTRACE("ENDSTR ");
+ BEGIN prev_state;
+
+ if (sudoerslval.string == NULL) {
+ LEXTRACE("ERROR "); /* empty string */
+ LEXRETURN(ERROR);
+ }
+ if (prev_state == INITIAL) {
+ switch (sudoerslval.string[0]) {
+ case '%':
+ if (sudoerslval.string[1] == '\0' ||
+ (sudoerslval.string[1] == ':' &&
+ sudoerslval.string[2] == '\0')) {
+ LEXTRACE("ERROR "); /* empty group */
+ LEXRETURN(ERROR);
+ }
+ LEXTRACE("USERGROUP ");
+ LEXRETURN(USERGROUP);
+ case '+':
+ if (sudoerslval.string[1] == '\0') {
+ LEXTRACE("ERROR "); /* empty netgroup */
+ LEXRETURN(ERROR);
+ }
+ LEXTRACE("NETGROUP ");
+ LEXRETURN(NETGROUP);
+ }
+ }
+ LEXTRACE("WORD(4) ");
+ LEXRETURN(WORD);
+ }
+
+ \\ {
+ LEXTRACE("BACKSLASH ");
+ if (!append(sudoerstext, sudoersleng))
+ yyterminate();
+ }
+
+ ([^\"\n\\]|\\\")+ {
+ LEXTRACE("STRBODY ");
+ if (!append(sudoerstext, sudoersleng))
+ yyterminate();
+ }
+}
+
+<GOTCMND>{
+ \\[\*\?\[\]\!] {
+ /* quoted fnmatch glob char, pass verbatim */
+ LEXTRACE("QUOTEDCHAR ");
+ if (!fill_args(sudoerstext, 2, sawspace))
+ yyterminate();
+ sawspace = false;
+ }
+
+ \\[:\\,= \t#] {
+ /* quoted sudoers special char, strip backslash */
+ LEXTRACE("QUOTEDCHAR ");
+ if (!fill_args(sudoerstext + 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(sudoerstext, sudoersleng, sawspace))
+ yyterminate();
+ sawspace = false;
+ } /* a command line arg */
+}
+
+<WANTDIGEST>[[:xdigit:]]+ {
+ /* Only return DIGEST if the length is correct. */
+ yy_size_t digest_len =
+ sudo_digest_getlen(digest_type);
+ if ((yy_size_t)sudoersleng == digest_len * 2) {
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ BEGIN INITIAL;
+ LEXTRACE("DIGEST ");
+ LEXRETURN(DIGEST);
+ }
+ BEGIN INITIAL;
+ yyless(sudoersleng);
+ } /* hex digest */
+
+<WANTDIGEST>[A-Za-z0-9\+/=]+ {
+ /* Only return DIGEST if the length is correct. */
+ yy_size_t len, digest_len =
+ sudo_digest_getlen(digest_type);
+ if (sudoerstext[sudoersleng - 1] == '=') {
+ /* use padding */
+ len = 4 * ((digest_len + 2) / 3);
+ } else {
+ /* no padding */
+ len = (4 * digest_len + 2) / 3;
+ }
+ if ((yy_size_t)sudoersleng == len) {
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ BEGIN INITIAL;
+ LEXTRACE("DIGEST ");
+ LEXRETURN(DIGEST);
+ }
+ BEGIN INITIAL;
+ yyless(sudoersleng);
+ } /* base64 digest */
+
+<INITIAL>^#include[[:blank:]]+.*\n {
+ char *path;
+
+ if (continued) {
+ LEXTRACE("ERROR ");
+ LEXRETURN(ERROR);
+ }
+
+ if ((path = parse_include(sudoerstext)) == 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_includedir(sudoerstext)) == NULL)
+ yyterminate();
+
+ LEXTRACE("INCLUDEDIR\n");
+
+ /*
+ * Push current buffer and switch to include file,
+ * ignoring missing or empty directories.
+ */
+ if (!push_includedir(path))
+ yyterminate();
+ }
+
+<INITIAL>^[[:blank:]]*Defaults([:@>\!][[:blank:]]*\!*\"?({ID}|{WORD}))? {
+ char deftype;
+ int n;
+
+ if (continued) {
+ LEXTRACE("ERROR ");
+ LEXRETURN(ERROR);
+ }
+
+ for (n = 0; isblank((unsigned char)sudoerstext[n]); n++)
+ continue;
+ n += sizeof("Defaults") - 1;
+ if ((deftype = sudoerstext[n++]) != '\0') {
+ while (isblank((unsigned char)sudoerstext[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)sudoerstext[n]); n++)
+ continue;
+ switch (sudoerstext[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);
+ }
+
+MAIL[[:blank:]]*: {
+ LEXTRACE("MAIL ");
+ LEXRETURN(MAIL);
+ }
+
+NOMAIL[[:blank:]]*: {
+ LEXTRACE("NOMAIL ");
+ LEXRETURN(NOMAIL);
+ }
+
+FOLLOW[[:blank:]]*: {
+ LEXTRACE("FOLLOW ");
+ LEXRETURN(FOLLOW);
+ }
+
+NOFOLLOW[[:blank:]]*: {
+ LEXTRACE("NOFOLLOW ");
+ LEXRETURN(NOFOLLOW);
+ }
+
+<INITIAL,GOTDEFS>(\+|\%|\%:) {
+ /* empty group or netgroup */
+ LEXTRACE("ERROR ");
+ LEXRETURN(ERROR);
+ }
+
+\+{WORD} {
+ /* netgroup */
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("NETGROUP ");
+ LEXRETURN(NETGROUP);
+ }
+
+\%:?({WORD}|{ID}) {
+ /* group */
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("USERGROUP ");
+ LEXRETURN(USERGROUP);
+ }
+
+{IPV4ADDR}(\/{IPV4ADDR})? {
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("NTWKADDR ");
+ LEXRETURN(NTWKADDR);
+ }
+
+{IPV4ADDR}\/([12]?[0-9]|3[0-2]) {
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("NTWKADDR ");
+ LEXRETURN(NTWKADDR);
+ }
+
+{IPV6ADDR}(\/{IPV6ADDR})? {
+ if (!ipv6_valid(sudoerstext)) {
+ LEXTRACE("ERROR ");
+ LEXRETURN(ERROR);
+ }
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("NTWKADDR ");
+ LEXRETURN(NTWKADDR);
+ }
+
+{IPV6ADDR}\/([0-9]|[1-9][0-9]|1[01][0-9]|12[0-8]) {
+ if (!ipv6_valid(sudoerstext)) {
+ LEXTRACE("ERROR ");
+ LEXRETURN(ERROR);
+ }
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("NTWKADDR ");
+ LEXRETURN(NTWKADDR);
+ }
+
+ALL {
+ LEXTRACE("ALL ");
+ LEXRETURN(ALL);
+
+ }
+
+<INITIAL>TIMEOUT {
+ LEXTRACE("CMND_TIMEOUT ");
+ LEXRETURN(CMND_TIMEOUT);
+ }
+
+<INITIAL>NOTBEFORE {
+ LEXTRACE("NOTBEFORE ");
+ LEXRETURN(NOTBEFORE);
+ }
+
+<INITIAL>NOTAFTER {
+ LEXTRACE("NOTAFTER ");
+ LEXRETURN(NOTAFTER);
+ }
+
+<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
+ }
+<INITIAL>PRIVS {
+#ifdef HAVE_PRIV_SET
+ LEXTRACE("PRIVS ");
+ LEXRETURN(PRIVS);
+#else
+ goto got_alias;
+#endif
+ }
+
+<INITIAL>LIMITPRIVS {
+#ifdef HAVE_PRIV_SET
+ LEXTRACE("LIMITPRIVS ");
+ LEXRETURN(LIMITPRIVS);
+#else
+ goto got_alias;
+#endif
+ }
+
+[[:upper:]][[:upper:][:digit:]_]* {
+ got_alias:
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("ALIAS ");
+ LEXRETURN(ALIAS);
+ }
+
+<GOTDEFS>({PATH}|sudoedit) {
+ /* XXX - no way to specify digest for command */
+ /* no command args allowed for Defaults!/path */
+ if (!fill_cmnd(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("COMMAND ");
+ LEXRETURN(COMMAND);
+ }
+
+sha224 {
+ digest_type = SUDO_DIGEST_SHA224;
+ BEGIN WANTDIGEST;
+ LEXTRACE("SHA224_TOK ");
+ LEXRETURN(SHA224_TOK);
+ }
+
+sha256 {
+ digest_type = SUDO_DIGEST_SHA256;
+ BEGIN WANTDIGEST;
+ LEXTRACE("SHA256_TOK ");
+ LEXRETURN(SHA256_TOK);
+ }
+
+sha384 {
+ digest_type = SUDO_DIGEST_SHA384;
+ BEGIN WANTDIGEST;
+ LEXTRACE("SHA384_TOK ");
+ LEXRETURN(SHA384_TOK);
+ }
+
+sha512 {
+ digest_type = SUDO_DIGEST_SHA512;
+ BEGIN WANTDIGEST;
+ LEXTRACE("SHA512_TOK ");
+ LEXRETURN(SHA512_TOK);
+ }
+
+sudoedit {
+ BEGIN GOTCMND;
+ LEXTRACE("COMMAND ");
+ if (!fill_cmnd(sudoerstext, sudoersleng))
+ yyterminate();
+ } /* sudo -e */
+
+{PATH} {
+ /* directories can't have args... */
+ if (sudoerstext[sudoersleng - 1] == '/') {
+ LEXTRACE("COMMAND ");
+ if (!fill_cmnd(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXRETURN(COMMAND);
+ } else {
+ BEGIN GOTCMND;
+ LEXTRACE("COMMAND ");
+ if (!fill_cmnd(sudoerstext, sudoersleng))
+ yyterminate();
+ }
+ } /* a pathname */
+
+<INITIAL,GOTDEFS>\" {
+ LEXTRACE("BEGINSTR ");
+ sudoerslval.string = NULL;
+ prev_state = YY_START;
+ BEGIN INSTR;
+ }
+
+<INITIAL,GOTDEFS>({ID}|{WORD}) {
+ /* a word */
+ if (!fill(sudoerstext, sudoersleng))
+ yyterminate();
+ LEXTRACE("WORD(5) ");
+ LEXRETURN(WORD);
+ }
+
+\( {
+ LEXTRACE("( ");
+ LEXRETURN('(');
+ }
+
+\) {
+ LEXTRACE(") ");
+ LEXRETURN(')');
+ }
+
+, {
+ LEXTRACE(", ");
+ LEXRETURN(',');
+ } /* return ',' */
+
+= {
+ LEXTRACE("= ");
+ LEXRETURN('=');
+ } /* return '=' */
+
+: {
+ LEXTRACE(": ");
+ LEXRETURN(':');
+ } /* return ':' */
+
+<*>!+ {
+ if (sudoersleng & 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? {
+ if (sudoerstext[sudoersleng - 1] == '\n') {
+ /* comment ending in a newline */
+ BEGIN INITIAL;
+ sudolineno++;
+ continued = false;
+ } else if (!feof(yyin)) {
+ LEXTRACE("ERROR ");
+ LEXRETURN(ERROR);
+ }
+ 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 {
+ SLIST_ENTRY(path_list) entries;
+ char *path;
+};
+
+SLIST_HEAD(path_list_head, path_list);
+
+struct include_stack {
+ YY_BUFFER_STATE bs;
+ char *path;
+ struct path_list_head more; /* more files in case of includedir */
+ int lineno;
+ bool keepopen;
+};
+
+/*
+ * Compare two struct path_list structs in reverse order.
+ */
+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((*p2)->path, (*p1)->path);
+}
+
+/*
+ * Open dirpath and fill in pathsp with an array of regular files
+ * that do not end in '~' or contain a '.'.
+ * Returns the number of files or -1 on error.
+ * If zero files are found, NULL is stored in pathsp.
+ */
+static int
+read_dir_files(const char *dirpath, struct path_list ***pathsp)
+{
+ DIR *dir;
+ int i, count = 0;
+ int max_paths = 32;
+ struct dirent *dent;
+ struct path_list **paths = NULL;
+ debug_decl(read_dir_files, SUDOERS_DEBUG_PARSER)
+
+ dir = opendir(dirpath);
+ if (dir == NULL) {
+ if (errno == ENOENT)
+ goto done;
+ sudo_warn("%s", dirpath);
+ goto bad;
+ }
+ paths = reallocarray(NULL, max_paths, sizeof(*paths));
+ if (paths == NULL)
+ goto oom;
+ while ((dent = readdir(dir)) != NULL) {
+ struct path_list *pl;
+ struct stat sb;
+ size_t len;
+ char *path;
+
+ /* 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;
+ }
+ len = strlen(dirpath) + 1 + NAMLEN(dent);
+ if ((path = rcstr_alloc(len)) == NULL)
+ goto oom;
+ (void)snprintf(path, len + 1, "%s/%s", dirpath, dent->d_name);
+ if (stat(path, &sb) != 0 || !S_ISREG(sb.st_mode)) {
+ rcstr_delref(path);
+ continue;
+ }
+ pl = malloc(sizeof(*pl));
+ if (pl == NULL) {
+ rcstr_delref(path);
+ goto oom;
+ }
+ pl->path = path;
+ if (count >= max_paths) {
+ struct path_list **tmp;
+ max_paths <<= 1;
+ tmp = reallocarray(paths, max_paths, sizeof(*paths));
+ if (tmp == NULL) {
+ rcstr_delref(path);
+ free(pl);
+ goto oom;
+ }
+ paths = tmp;
+ }
+ paths[count++] = pl;
+ }
+ closedir(dir);
+ if (count == 0) {
+ free(paths);
+ paths = NULL;
+ }
+done:
+ *pathsp = paths;
+ debug_return_int(count);
+oom:
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+bad:
+ sudoerserror(NULL);
+ if (dir != NULL)
+ closedir(dir);
+ for (i = 0; i < count; i++) {
+ rcstr_delref(paths[i]->path);
+ free(paths[i]);
+ }
+ free(paths);
+ debug_return_int(-1);
+}
+
+/*
+ * Push a list of all files in dirpath onto stack.
+ * Returns the number of files or -1 on error.
+ */
+static int
+switch_dir(struct include_stack *stack, char *dirpath)
+{
+ struct path_list **paths = NULL;
+ int count, i;
+ debug_decl(switch_dir, SUDOERS_DEBUG_PARSER)
+
+ count = read_dir_files(dirpath, &paths);
+ if (count > 0) {
+ /* Sort the list as an array in reverse order. */
+ qsort(paths, count, sizeof(*paths), pl_compare);
+
+ /* Build up the list in sorted order. */
+ for (i = 0; i < count; i++) {
+ SLIST_INSERT_HEAD(&stack->more, paths[i], entries);
+ }
+ free(paths);
+ }
+
+ debug_return_int(count);
+}
+
+#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, SUDOERS_DEBUG_PARSER)
+
+ while (idepth) {
+ idepth--;
+ while ((pl = SLIST_FIRST(&istack[idepth].more)) != NULL) {
+ SLIST_REMOVE_HEAD(&istack[idepth].more, entries);
+ rcstr_delref(pl->path);
+ free(pl);
+ }
+ rcstr_delref(istack[idepth].path);
+ if (idepth && !istack[idepth].keepopen)
+ fclose(istack[idepth].bs->yy_input_file);
+ sudoers_delete_buffer(istack[idepth].bs);
+ }
+ free(istack);
+ istack = NULL;
+ istacksize = idepth = 0;
+ sudolineno = 1;
+ keepopen = false;
+ sawspace = false;
+ continued = false;
+ digest_type = -1;
+ prev_state = INITIAL;
+
+ debug_return;
+}
+
+/*
+ * Open an include file (or file from a directory), push the old
+ * sudoers file buffer and switch to the new one.
+ * A missing or insecure include dir is simply ignored.
+ * Returns false on error, else true.
+ */
+static bool
+push_include_int(char *path, bool isdir)
+{
+ struct path_list *pl;
+ FILE *fp;
+ debug_decl(push_include_int, SUDOERS_DEBUG_PARSER)
+
+ /* push current state onto stack */
+ if (idepth >= istacksize) {
+ struct include_stack *new_istack;
+
+ if (idepth > MAX_SUDOERS_DEPTH) {
+ sudoerserror(N_("too many levels of includes"));
+ debug_return_bool(false);
+ }
+ istacksize += SUDOERS_STACK_INCREMENT;
+ new_istack = reallocarray(istack, istacksize, sizeof(*istack));
+ if (new_istack == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ sudoerserror(NULL);
+ debug_return_bool(false);
+ }
+ istack = new_istack;
+ }
+ SLIST_INIT(&istack[idepth].more);
+ if (isdir) {
+ struct stat sb;
+ int count, status;
+
+ status = sudo_secure_dir(path, sudoers_uid, sudoers_gid, &sb);
+ if (status != SUDO_PATH_SECURE) {
+ if (sudoers_warnings) {
+ switch (status) {
+ case SUDO_PATH_BAD_TYPE:
+ errno = ENOTDIR;
+ sudo_warn("%s", path);
+ break;
+ case SUDO_PATH_WRONG_OWNER:
+ sudo_warnx(U_("%s is owned by uid %u, should be %u"),
+ path, (unsigned int) sb.st_uid,
+ (unsigned int) sudoers_uid);
+ break;
+ case SUDO_PATH_WORLD_WRITABLE:
+ sudo_warnx(U_("%s is world writable"), path);
+ break;
+ case SUDO_PATH_GROUP_WRITABLE:
+ sudo_warnx(U_("%s is owned by gid %u, should be %u"),
+ path, (unsigned int) sb.st_gid,
+ (unsigned int) sudoers_gid);
+ break;
+ default:
+ break;
+ }
+ }
+ /* A missing or insecure include dir is not a fatal error. */
+ debug_return_bool(true);
+ }
+ count = switch_dir(&istack[idepth], path);
+ if (count <= 0) {
+ /* switch_dir() called sudoerserror() for us */
+ rcstr_delref(path);
+ debug_return_bool(count ? false : true);
+ }
+
+ /* Parse the first dir entry we can open, leave the rest for later. */
+ do {
+ rcstr_delref(path);
+ if ((pl = SLIST_FIRST(&istack[idepth].more)) == NULL) {
+ /* Unable to open any files in include dir, not an error. */
+ debug_return_bool(true);
+ }
+ SLIST_REMOVE_HEAD(&istack[idepth].more, entries);
+ path = pl->path;
+ free(pl);
+ } while ((fp = open_sudoers(path, false, &keepopen)) == NULL);
+ } else {
+ if ((fp = open_sudoers(path, true, &keepopen)) == NULL) {
+ /* The error was already printed by open_sudoers() */
+ sudoerserror(NULL);
+ debug_return_bool(false);
+ }
+ }
+ /* Push the old (current) file and open the new one. */
+ istack[idepth].path = sudoers; /* push old path (and its ref) */
+ istack[idepth].bs = YY_CURRENT_BUFFER;
+ istack[idepth].lineno = sudolineno;
+ istack[idepth].keepopen = keepopen;
+ idepth++;
+ sudolineno = 1;
+ sudoers = path;
+ sudoers_switch_to_buffer(sudoers_create_buffer(fp, YY_BUF_SIZE));
+
+ debug_return_bool(true);
+}
+
+/*
+ * Restore the previous sudoers file and buffer, or, in the case
+ * of an includedir, switch to the next file in the dir.
+ * Returns false if there is nothing to pop, else true.
+ */
+static bool
+pop_include(void)
+{
+ struct path_list *pl;
+ FILE *fp;
+ debug_decl(pop_include, SUDOERS_DEBUG_PARSER)
+
+ if (idepth == 0 || YY_CURRENT_BUFFER == NULL)
+ debug_return_bool(false);
+
+ if (!keepopen)
+ fclose(YY_CURRENT_BUFFER->yy_input_file);
+ sudoers_delete_buffer(YY_CURRENT_BUFFER);
+ /* If we are in an include dir, move to the next file. */
+ while ((pl = SLIST_FIRST(&istack[idepth - 1].more)) != NULL) {
+ SLIST_REMOVE_HEAD(&istack[idepth - 1].more, entries);
+ fp = open_sudoers(pl->path, false, &keepopen);
+ if (fp != NULL) {
+ rcstr_delref(sudoers);
+ sudoers = pl->path;
+ sudolineno = 1;
+ sudoers_switch_to_buffer(sudoers_create_buffer(fp, YY_BUF_SIZE));
+ free(pl);
+ break;
+ }
+ /* Unable to open path in include dir, go to next one. */
+ rcstr_delref(pl->path);
+ free(pl);
+ }
+ /* If no path list, just pop the last dir on the stack. */
+ if (pl == NULL) {
+ idepth--;
+ sudoers_switch_to_buffer(istack[idepth].bs);
+ rcstr_delref(sudoers);
+ sudoers = istack[idepth].path;
+ sudolineno = istack[idepth].lineno;
+ keepopen = istack[idepth].keepopen;
+ }
+ debug_return_bool(true);
+}
+
+static char *
+parse_include_int(const char *base, bool isdir)
+{
+ const char *cp, *ep;
+ char *path, *pp;
+ int dirlen = 0, len = 0, subst = 0;
+ size_t shost_len = 0;
+ debug_decl(parse_include, SUDOERS_DEBUG_PARSER)
+
+ /* Pull out path from #include line. */
+ cp = base + (isdir ? sizeof("#includedir") : sizeof("#include"));
+ 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 = rcstr_alloc(len + dirlen);
+ if (path == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ sudoerserror(NULL);
+ 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
+int
+sudoers_trace_print(const char *msg)
+{
+ return fputs(msg, stderr);
+}
+#else
+int
+sudoers_trace_print(const char *msg)
+{
+ static bool initialized;
+ static struct sudo_lbuf lbuf;
+
+ if (!initialized) {
+ initialized = true;
+ sudo_lbuf_init(&lbuf, NULL, 0, NULL, 0);
+ }
+
+ sudo_lbuf_append(&lbuf, "%s", msg);
+ /* XXX - assumes a final newline */
+ if (strchr(msg, '\n') != NULL)
+ {
+ sudo_debug_printf2(NULL, NULL, 0, SUDOERS_DEBUG_PARSER|SUDO_DEBUG_DEBUG,
+ "%s:%d %s", sudoers, sudolineno, lbuf.buf);
+ lbuf.len = 0;
+ }
+ return 0;
+}
+#endif /* TRACELEXER */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-31 06:08:23 +0000