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-rw-r--r--plugins/sudoers/gram.y1327
1 files changed, 1327 insertions, 0 deletions
diff --git a/plugins/sudoers/gram.y b/plugins/sudoers/gram.y
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--- /dev/null
+++ b/plugins/sudoers/gram.y
@@ -0,0 +1,1327 @@
+%{
+/*
+ * Copyright (c) 1996, 1998-2005, 2007-2013, 2014-2018
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <unistd.h>
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+#if defined(YYBISON) && defined(HAVE_ALLOCA_H) && !defined(__GNUC__)
+# include <alloca.h>
+#endif /* YYBISON && HAVE_ALLOCA_H && !__GNUC__ */
+#include <errno.h>
+
+#include "sudoers.h"
+#include "sudo_digest.h"
+#include "toke.h"
+
+/* If we last saw a newline the entry is on the preceding line. */
+#define this_lineno (last_token == COMMENT ? sudolineno - 1 : sudolineno)
+
+/*
+ * Globals
+ */
+bool sudoers_warnings = true;
+bool parse_error = false;
+int errorlineno = -1;
+char *errorfile = NULL;
+
+struct sudoers_parse_tree parsed_policy = {
+ TAILQ_HEAD_INITIALIZER(parsed_policy.userspecs),
+ TAILQ_HEAD_INITIALIZER(parsed_policy.defaults),
+ NULL /* aliases */
+};
+
+/*
+ * Local protoypes
+ */
+static void init_options(struct command_options *opts);
+static bool add_defaults(int, struct member *, struct defaults *);
+static bool add_userspec(struct member *, struct privilege *);
+static struct defaults *new_default(char *, char *, short);
+static struct member *new_member(char *, int);
+static struct command_digest *new_digest(int, char *);
+%}
+
+%union {
+ struct cmndspec *cmndspec;
+ struct defaults *defaults;
+ struct member *member;
+ struct runascontainer *runas;
+ struct privilege *privilege;
+ struct command_digest *digest;
+ struct sudo_command command;
+ struct command_options options;
+ struct cmndtag tag;
+ char *string;
+ int tok;
+}
+
+%start file /* special start symbol */
+%token <command> COMMAND /* absolute pathname w/ optional args */
+%token <string> ALIAS /* an UPPERCASE alias name */
+%token <string> DEFVAR /* a Defaults variable name */
+%token <string> NTWKADDR /* ipv4 or ipv6 address */
+%token <string> NETGROUP /* a netgroup (+NAME) */
+%token <string> USERGROUP /* a usergroup (%NAME) */
+%token <string> WORD /* a word */
+%token <string> DIGEST /* a SHA-2 digest */
+%token <tok> DEFAULTS /* Defaults entry */
+%token <tok> DEFAULTS_HOST /* Host-specific defaults entry */
+%token <tok> DEFAULTS_USER /* User-specific defaults entry */
+%token <tok> DEFAULTS_RUNAS /* Runas-specific defaults entry */
+%token <tok> DEFAULTS_CMND /* Command-specific defaults entry */
+%token <tok> NOPASSWD /* no passwd req for command */
+%token <tok> PASSWD /* passwd req for command (default) */
+%token <tok> NOEXEC /* preload dummy execve() for cmnd */
+%token <tok> EXEC /* don't preload dummy execve() */
+%token <tok> SETENV /* user may set environment for cmnd */
+%token <tok> NOSETENV /* user may not set environment */
+%token <tok> LOG_INPUT /* log user's cmnd input */
+%token <tok> NOLOG_INPUT /* don't log user's cmnd input */
+%token <tok> LOG_OUTPUT /* log cmnd output */
+%token <tok> NOLOG_OUTPUT /* don't log cmnd output */
+%token <tok> MAIL /* mail log message */
+%token <tok> NOMAIL /* don't mail log message */
+%token <tok> FOLLOW /* follow symbolic links */
+%token <tok> NOFOLLOW /* don't follow symbolic links */
+%token <tok> ALL /* ALL keyword */
+%token <tok> COMMENT /* comment and/or carriage return */
+%token <tok> HOSTALIAS /* Host_Alias keyword */
+%token <tok> CMNDALIAS /* Cmnd_Alias keyword */
+%token <tok> USERALIAS /* User_Alias keyword */
+%token <tok> RUNASALIAS /* Runas_Alias keyword */
+%token <tok> ':' '=' ',' '!' '+' '-' /* union member tokens */
+%token <tok> '(' ')' /* runas tokens */
+%token <tok> ERROR
+%token <tok> TYPE /* SELinux type */
+%token <tok> ROLE /* SELinux role */
+%token <tok> PRIVS /* Solaris privileges */
+%token <tok> LIMITPRIVS /* Solaris limit privileges */
+%token <tok> CMND_TIMEOUT /* command timeout */
+%token <tok> NOTBEFORE /* time restriction */
+%token <tok> NOTAFTER /* time restriction */
+%token <tok> MYSELF /* run as myself, not another user */
+%token <tok> SHA224_TOK /* sha224 token */
+%token <tok> SHA256_TOK /* sha256 token */
+%token <tok> SHA384_TOK /* sha384 token */
+%token <tok> SHA512_TOK /* sha512 token */
+
+%type <cmndspec> cmndspec
+%type <cmndspec> cmndspeclist
+%type <defaults> defaults_entry
+%type <defaults> defaults_list
+%type <member> cmnd
+%type <member> opcmnd
+%type <member> digcmnd
+%type <member> cmndlist
+%type <member> host
+%type <member> hostlist
+%type <member> ophost
+%type <member> opuser
+%type <member> user
+%type <member> userlist
+%type <member> opgroup
+%type <member> group
+%type <member> grouplist
+%type <runas> runasspec
+%type <runas> runaslist
+%type <privilege> privilege
+%type <privilege> privileges
+%type <tag> cmndtag
+%type <options> options
+%type <string> rolespec
+%type <string> typespec
+%type <string> privsspec
+%type <string> limitprivsspec
+%type <string> timeoutspec
+%type <string> notbeforespec
+%type <string> notafterspec
+%type <digest> digest
+
+%%
+
+file : { ; }
+ | line
+ ;
+
+line : entry
+ | line entry
+ ;
+
+entry : COMMENT {
+ ;
+ }
+ | error COMMENT {
+ yyerrok;
+ }
+ | userlist privileges {
+ if (!add_userspec($1, $2)) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | USERALIAS useraliases {
+ ;
+ }
+ | HOSTALIAS hostaliases {
+ ;
+ }
+ | CMNDALIAS cmndaliases {
+ ;
+ }
+ | RUNASALIAS runasaliases {
+ ;
+ }
+ | DEFAULTS defaults_list {
+ if (!add_defaults(DEFAULTS, NULL, $2))
+ YYERROR;
+ }
+ | DEFAULTS_USER userlist defaults_list {
+ if (!add_defaults(DEFAULTS_USER, $2, $3))
+ YYERROR;
+ }
+ | DEFAULTS_RUNAS userlist defaults_list {
+ if (!add_defaults(DEFAULTS_RUNAS, $2, $3))
+ YYERROR;
+ }
+ | DEFAULTS_HOST hostlist defaults_list {
+ if (!add_defaults(DEFAULTS_HOST, $2, $3))
+ YYERROR;
+ }
+ | DEFAULTS_CMND cmndlist defaults_list {
+ if (!add_defaults(DEFAULTS_CMND, $2, $3))
+ YYERROR;
+ }
+ ;
+
+defaults_list : defaults_entry
+ | defaults_list ',' defaults_entry {
+ HLTQ_CONCAT($1, $3, entries);
+ $$ = $1;
+ }
+ ;
+
+defaults_entry : DEFVAR {
+ $$ = new_default($1, NULL, true);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | '!' DEFVAR {
+ $$ = new_default($2, NULL, false);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | DEFVAR '=' WORD {
+ $$ = new_default($1, $3, true);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | DEFVAR '+' WORD {
+ $$ = new_default($1, $3, '+');
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | DEFVAR '-' WORD {
+ $$ = new_default($1, $3, '-');
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+privileges : privilege
+ | privileges ':' privilege {
+ HLTQ_CONCAT($1, $3, entries);
+ $$ = $1;
+ }
+ ;
+
+privilege : hostlist '=' cmndspeclist {
+ struct privilege *p = calloc(1, sizeof(*p));
+ if (p == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ TAILQ_INIT(&p->defaults);
+ HLTQ_TO_TAILQ(&p->hostlist, $1, entries);
+ HLTQ_TO_TAILQ(&p->cmndlist, $3, entries);
+ HLTQ_INIT(p, entries);
+ $$ = p;
+ }
+ ;
+
+ophost : host {
+ $$ = $1;
+ $$->negated = false;
+ }
+ | '!' host {
+ $$ = $2;
+ $$->negated = true;
+ }
+ ;
+
+host : ALIAS {
+ $$ = new_member($1, ALIAS);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | ALL {
+ $$ = new_member(NULL, ALL);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | NETGROUP {
+ $$ = new_member($1, NETGROUP);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | NTWKADDR {
+ $$ = new_member($1, NTWKADDR);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | WORD {
+ $$ = new_member($1, WORD);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+cmndspeclist : cmndspec
+ | cmndspeclist ',' cmndspec {
+ struct cmndspec *prev;
+ prev = HLTQ_LAST($1, cmndspec, entries);
+ HLTQ_CONCAT($1, $3, entries);
+#ifdef HAVE_SELINUX
+ /* propagate role and type */
+ if ($3->role == NULL && $3->type == NULL) {
+ $3->role = prev->role;
+ $3->type = prev->type;
+ }
+#endif /* HAVE_SELINUX */
+#ifdef HAVE_PRIV_SET
+ /* propagate privs & limitprivs */
+ if ($3->privs == NULL && $3->limitprivs == NULL) {
+ $3->privs = prev->privs;
+ $3->limitprivs = prev->limitprivs;
+ }
+#endif /* HAVE_PRIV_SET */
+ /* propagate command time restrictions */
+ if ($3->notbefore == UNSPEC)
+ $3->notbefore = prev->notbefore;
+ if ($3->notafter == UNSPEC)
+ $3->notafter = prev->notafter;
+ /* propagate command timeout */
+ if ($3->timeout == UNSPEC)
+ $3->timeout = prev->timeout;
+ /* propagate tags and runas list */
+ if ($3->tags.nopasswd == UNSPEC)
+ $3->tags.nopasswd = prev->tags.nopasswd;
+ if ($3->tags.noexec == UNSPEC)
+ $3->tags.noexec = prev->tags.noexec;
+ if ($3->tags.setenv == UNSPEC &&
+ prev->tags.setenv != IMPLIED)
+ $3->tags.setenv = prev->tags.setenv;
+ if ($3->tags.log_input == UNSPEC)
+ $3->tags.log_input = prev->tags.log_input;
+ if ($3->tags.log_output == UNSPEC)
+ $3->tags.log_output = prev->tags.log_output;
+ if ($3->tags.send_mail == UNSPEC)
+ $3->tags.send_mail = prev->tags.send_mail;
+ if ($3->tags.follow == UNSPEC)
+ $3->tags.follow = prev->tags.follow;
+ if (($3->runasuserlist == NULL &&
+ $3->runasgrouplist == NULL) &&
+ (prev->runasuserlist != NULL ||
+ prev->runasgrouplist != NULL)) {
+ $3->runasuserlist = prev->runasuserlist;
+ $3->runasgrouplist = prev->runasgrouplist;
+ }
+ $$ = $1;
+ }
+ ;
+
+cmndspec : runasspec options cmndtag digcmnd {
+ struct cmndspec *cs = calloc(1, sizeof(*cs));
+ if (cs == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ if ($1 != NULL) {
+ if ($1->runasusers != NULL) {
+ cs->runasuserlist =
+ malloc(sizeof(*cs->runasuserlist));
+ if (cs->runasuserlist == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ HLTQ_TO_TAILQ(cs->runasuserlist,
+ $1->runasusers, entries);
+ }
+ if ($1->runasgroups != NULL) {
+ cs->runasgrouplist =
+ malloc(sizeof(*cs->runasgrouplist));
+ if (cs->runasgrouplist == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ HLTQ_TO_TAILQ(cs->runasgrouplist,
+ $1->runasgroups, entries);
+ }
+ free($1);
+ }
+#ifdef HAVE_SELINUX
+ cs->role = $2.role;
+ cs->type = $2.type;
+#endif
+#ifdef HAVE_PRIV_SET
+ cs->privs = $2.privs;
+ cs->limitprivs = $2.limitprivs;
+#endif
+ cs->notbefore = $2.notbefore;
+ cs->notafter = $2.notafter;
+ cs->timeout = $2.timeout;
+ cs->tags = $3;
+ cs->cmnd = $4;
+ HLTQ_INIT(cs, entries);
+ /* sudo "ALL" implies the SETENV tag */
+ if (cs->cmnd->type == ALL && !cs->cmnd->negated &&
+ cs->tags.setenv == UNSPEC)
+ cs->tags.setenv = IMPLIED;
+ $$ = cs;
+ }
+ ;
+
+digest : SHA224_TOK ':' DIGEST {
+ $$ = new_digest(SUDO_DIGEST_SHA224, $3);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | SHA256_TOK ':' DIGEST {
+ $$ = new_digest(SUDO_DIGEST_SHA256, $3);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | SHA384_TOK ':' DIGEST {
+ $$ = new_digest(SUDO_DIGEST_SHA384, $3);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | SHA512_TOK ':' DIGEST {
+ $$ = new_digest(SUDO_DIGEST_SHA512, $3);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+digcmnd : opcmnd {
+ $$ = $1;
+ }
+ | digest opcmnd {
+ if ($2->type != COMMAND) {
+ sudoerserror(N_("a digest requires a path name"));
+ YYERROR;
+ }
+ /* XXX - yuck */
+ ((struct sudo_command *) $2->name)->digest = $1;
+ $$ = $2;
+ }
+ ;
+
+opcmnd : cmnd {
+ $$ = $1;
+ $$->negated = false;
+ }
+ | '!' cmnd {
+ $$ = $2;
+ $$->negated = true;
+ }
+ ;
+
+timeoutspec : CMND_TIMEOUT '=' WORD {
+ $$ = $3;
+ }
+ ;
+
+notbeforespec : NOTBEFORE '=' WORD {
+ $$ = $3;
+ }
+
+notafterspec : NOTAFTER '=' WORD {
+ $$ = $3;
+ }
+ ;
+
+rolespec : ROLE '=' WORD {
+ $$ = $3;
+ }
+ ;
+
+typespec : TYPE '=' WORD {
+ $$ = $3;
+ }
+ ;
+
+privsspec : PRIVS '=' WORD {
+ $$ = $3;
+ }
+ ;
+limitprivsspec : LIMITPRIVS '=' WORD {
+ $$ = $3;
+ }
+ ;
+
+runasspec : /* empty */ {
+ $$ = NULL;
+ }
+ | '(' runaslist ')' {
+ $$ = $2;
+ }
+ ;
+
+runaslist : /* empty */ {
+ $$ = calloc(1, sizeof(struct runascontainer));
+ if ($$ != NULL) {
+ $$->runasusers = new_member(NULL, MYSELF);
+ /* $$->runasgroups = NULL; */
+ if ($$->runasusers == NULL) {
+ free($$);
+ $$ = NULL;
+ }
+ }
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | userlist {
+ $$ = calloc(1, sizeof(struct runascontainer));
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ $$->runasusers = $1;
+ /* $$->runasgroups = NULL; */
+ }
+ | userlist ':' grouplist {
+ $$ = calloc(1, sizeof(struct runascontainer));
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ $$->runasusers = $1;
+ $$->runasgroups = $3;
+ }
+ | ':' grouplist {
+ $$ = calloc(1, sizeof(struct runascontainer));
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ /* $$->runasusers = NULL; */
+ $$->runasgroups = $2;
+ }
+ | ':' {
+ $$ = calloc(1, sizeof(struct runascontainer));
+ if ($$ != NULL) {
+ $$->runasusers = new_member(NULL, MYSELF);
+ /* $$->runasgroups = NULL; */
+ if ($$->runasusers == NULL) {
+ free($$);
+ $$ = NULL;
+ }
+ }
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+options : /* empty */ {
+ init_options(&$$);
+ }
+ | options notbeforespec {
+ $$.notbefore = parse_gentime($2);
+ free($2);
+ if ($$.notbefore == -1) {
+ sudoerserror(N_("invalid notbefore value"));
+ YYERROR;
+ }
+ }
+ | options notafterspec {
+ $$.notafter = parse_gentime($2);
+ free($2);
+ if ($$.notafter == -1) {
+ sudoerserror(N_("invalid notafter value"));
+ YYERROR;
+ }
+ }
+ | options timeoutspec {
+ $$.timeout = parse_timeout($2);
+ free($2);
+ if ($$.timeout == -1) {
+ if (errno == ERANGE)
+ sudoerserror(N_("timeout value too large"));
+ else
+ sudoerserror(N_("invalid timeout value"));
+ YYERROR;
+ }
+ }
+ | options rolespec {
+#ifdef HAVE_SELINUX
+ free($$.role);
+ $$.role = $2;
+#endif
+ }
+ | options typespec {
+#ifdef HAVE_SELINUX
+ free($$.type);
+ $$.type = $2;
+#endif
+ }
+ | options privsspec {
+#ifdef HAVE_PRIV_SET
+ free($$.privs);
+ $$.privs = $2;
+#endif
+ }
+ | options limitprivsspec {
+#ifdef HAVE_PRIV_SET
+ free($$.limitprivs);
+ $$.limitprivs = $2;
+#endif
+ }
+ ;
+
+cmndtag : /* empty */ {
+ TAGS_INIT($$);
+ }
+ | cmndtag NOPASSWD {
+ $$.nopasswd = true;
+ }
+ | cmndtag PASSWD {
+ $$.nopasswd = false;
+ }
+ | cmndtag NOEXEC {
+ $$.noexec = true;
+ }
+ | cmndtag EXEC {
+ $$.noexec = false;
+ }
+ | cmndtag SETENV {
+ $$.setenv = true;
+ }
+ | cmndtag NOSETENV {
+ $$.setenv = false;
+ }
+ | cmndtag LOG_INPUT {
+ $$.log_input = true;
+ }
+ | cmndtag NOLOG_INPUT {
+ $$.log_input = false;
+ }
+ | cmndtag LOG_OUTPUT {
+ $$.log_output = true;
+ }
+ | cmndtag NOLOG_OUTPUT {
+ $$.log_output = false;
+ }
+ | cmndtag FOLLOW {
+ $$.follow = true;
+ }
+ | cmndtag NOFOLLOW {
+ $$.follow = false;
+ }
+ | cmndtag MAIL {
+ $$.send_mail = true;
+ }
+ | cmndtag NOMAIL {
+ $$.send_mail = false;
+ }
+ ;
+
+cmnd : ALL {
+ $$ = new_member(NULL, ALL);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | ALIAS {
+ $$ = new_member($1, ALIAS);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | COMMAND {
+ struct sudo_command *c = calloc(1, sizeof(*c));
+ if (c == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ c->cmnd = $1.cmnd;
+ c->args = $1.args;
+ $$ = new_member((char *)c, COMMAND);
+ if ($$ == NULL) {
+ free(c);
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+hostaliases : hostalias
+ | hostaliases ':' hostalias
+ ;
+
+hostalias : ALIAS '=' hostlist {
+ const char *s;
+ s = alias_add(&parsed_policy, $1, HOSTALIAS,
+ sudoers, this_lineno, $3);
+ if (s != NULL) {
+ sudoerserror(s);
+ YYERROR;
+ }
+ }
+ ;
+
+hostlist : ophost
+ | hostlist ',' ophost {
+ HLTQ_CONCAT($1, $3, entries);
+ $$ = $1;
+ }
+ ;
+
+cmndaliases : cmndalias
+ | cmndaliases ':' cmndalias
+ ;
+
+cmndalias : ALIAS '=' cmndlist {
+ const char *s;
+ s = alias_add(&parsed_policy, $1, CMNDALIAS,
+ sudoers, this_lineno, $3);
+ if (s != NULL) {
+ sudoerserror(s);
+ YYERROR;
+ }
+ }
+ ;
+
+cmndlist : digcmnd
+ | cmndlist ',' digcmnd {
+ HLTQ_CONCAT($1, $3, entries);
+ $$ = $1;
+ }
+ ;
+
+runasaliases : runasalias
+ | runasaliases ':' runasalias
+ ;
+
+runasalias : ALIAS '=' userlist {
+ const char *s;
+ s = alias_add(&parsed_policy, $1, RUNASALIAS,
+ sudoers, this_lineno, $3);
+ if (s != NULL) {
+ sudoerserror(s);
+ YYERROR;
+ }
+ }
+ ;
+
+useraliases : useralias
+ | useraliases ':' useralias
+ ;
+
+useralias : ALIAS '=' userlist {
+ const char *s;
+ s = alias_add(&parsed_policy, $1, USERALIAS,
+ sudoers, this_lineno, $3);
+ if (s != NULL) {
+ sudoerserror(s);
+ YYERROR;
+ }
+ }
+ ;
+
+userlist : opuser
+ | userlist ',' opuser {
+ HLTQ_CONCAT($1, $3, entries);
+ $$ = $1;
+ }
+ ;
+
+opuser : user {
+ $$ = $1;
+ $$->negated = false;
+ }
+ | '!' user {
+ $$ = $2;
+ $$->negated = true;
+ }
+ ;
+
+user : ALIAS {
+ $$ = new_member($1, ALIAS);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | ALL {
+ $$ = new_member(NULL, ALL);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | NETGROUP {
+ $$ = new_member($1, NETGROUP);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | USERGROUP {
+ $$ = new_member($1, USERGROUP);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | WORD {
+ $$ = new_member($1, WORD);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+grouplist : opgroup
+ | grouplist ',' opgroup {
+ HLTQ_CONCAT($1, $3, entries);
+ $$ = $1;
+ }
+ ;
+
+opgroup : group {
+ $$ = $1;
+ $$->negated = false;
+ }
+ | '!' group {
+ $$ = $2;
+ $$->negated = true;
+ }
+ ;
+
+group : ALIAS {
+ $$ = new_member($1, ALIAS);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | ALL {
+ $$ = new_member(NULL, ALL);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ | WORD {
+ $$ = new_member($1, WORD);
+ if ($$ == NULL) {
+ sudoerserror(N_("unable to allocate memory"));
+ YYERROR;
+ }
+ }
+ ;
+
+%%
+void
+sudoerserror(const char *s)
+{
+ debug_decl(sudoerserror, SUDOERS_DEBUG_PARSER)
+
+ /* Save the line the first error occurred on. */
+ if (errorlineno == -1) {
+ errorlineno = this_lineno;
+ rcstr_delref(errorfile);
+ errorfile = rcstr_addref(sudoers);
+ }
+ if (sudoers_warnings && s != NULL) {
+ LEXTRACE("<*> ");
+#ifndef TRACELEXER
+ if (trace_print == NULL || trace_print == sudoers_trace_print) {
+ const char fmt[] = ">>> %s: %s near line %d <<<\n";
+ int oldlocale;
+
+ /* Warnings are displayed in the user's locale. */
+ sudoers_setlocale(SUDOERS_LOCALE_USER, &oldlocale);
+ sudo_printf(SUDO_CONV_ERROR_MSG, _(fmt), sudoers, _(s), this_lineno);
+ sudoers_setlocale(oldlocale, NULL);
+ }
+#endif
+ }
+ parse_error = true;
+ debug_return;
+}
+
+static struct defaults *
+new_default(char *var, char *val, short op)
+{
+ struct defaults *d;
+ debug_decl(new_default, SUDOERS_DEBUG_PARSER)
+
+ if ((d = calloc(1, sizeof(struct defaults))) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate memory");
+ debug_return_ptr(NULL);
+ }
+
+ d->var = var;
+ d->val = val;
+ /* d->type = 0; */
+ d->op = op;
+ /* d->binding = NULL */
+ d->lineno = this_lineno;
+ d->file = rcstr_addref(sudoers);
+ HLTQ_INIT(d, entries);
+
+ debug_return_ptr(d);
+}
+
+static struct member *
+new_member(char *name, int type)
+{
+ struct member *m;
+ debug_decl(new_member, SUDOERS_DEBUG_PARSER)
+
+ if ((m = calloc(1, sizeof(struct member))) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate memory");
+ debug_return_ptr(NULL);
+ }
+
+ m->name = name;
+ m->type = type;
+ HLTQ_INIT(m, entries);
+
+ debug_return_ptr(m);
+}
+
+static struct command_digest *
+new_digest(int digest_type, char *digest_str)
+{
+ struct command_digest *digest;
+ debug_decl(new_digest, SUDOERS_DEBUG_PARSER)
+
+ if ((digest = malloc(sizeof(*digest))) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate memory");
+ debug_return_ptr(NULL);
+ }
+
+ digest->digest_type = digest_type;
+ digest->digest_str = digest_str;
+ if (digest->digest_str == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate memory");
+ free(digest);
+ digest = NULL;
+ }
+
+ debug_return_ptr(digest);
+}
+
+/*
+ * Add a list of defaults structures to the defaults list.
+ * The binding, if non-NULL, specifies a list of hosts, users, or
+ * runas users the entries apply to (specified by the type).
+ */
+static bool
+add_defaults(int type, struct member *bmem, struct defaults *defs)
+{
+ struct defaults *d, *next;
+ struct member_list *binding;
+ bool ret = true;
+ debug_decl(add_defaults, SUDOERS_DEBUG_PARSER)
+
+ if (defs != NULL) {
+ /*
+ * We use a single binding for each entry in defs.
+ */
+ if ((binding = malloc(sizeof(*binding))) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate memory");
+ sudoerserror(N_("unable to allocate memory"));
+ debug_return_bool(false);
+ }
+ if (bmem != NULL)
+ HLTQ_TO_TAILQ(binding, bmem, entries);
+ else
+ TAILQ_INIT(binding);
+
+ /*
+ * Set type and binding (who it applies to) for new entries.
+ * Then add to the global defaults list.
+ */
+ HLTQ_FOREACH_SAFE(d, defs, entries, next) {
+ d->type = type;
+ d->binding = binding;
+ TAILQ_INSERT_TAIL(&parsed_policy.defaults, d, entries);
+ }
+ }
+
+ debug_return_bool(ret);
+}
+
+/*
+ * Allocate a new struct userspec, populate it, and insert it at the
+ * end of the userspecs list.
+ */
+static bool
+add_userspec(struct member *members, struct privilege *privs)
+{
+ struct userspec *u;
+ debug_decl(add_userspec, SUDOERS_DEBUG_PARSER)
+
+ if ((u = calloc(1, sizeof(*u))) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "unable to allocate memory");
+ debug_return_bool(false);
+ }
+ u->lineno = this_lineno;
+ u->file = rcstr_addref(sudoers);
+ HLTQ_TO_TAILQ(&u->users, members, entries);
+ HLTQ_TO_TAILQ(&u->privileges, privs, entries);
+ STAILQ_INIT(&u->comments);
+ TAILQ_INSERT_TAIL(&parsed_policy.userspecs, u, entries);
+
+ debug_return_bool(true);
+}
+
+/*
+ * Free a member struct and its contents.
+ */
+void
+free_member(struct member *m)
+{
+ debug_decl(free_member, SUDOERS_DEBUG_PARSER)
+
+ if (m->type == COMMAND) {
+ struct sudo_command *c = (struct sudo_command *)m->name;
+ free(c->cmnd);
+ free(c->args);
+ if (c->digest != NULL) {
+ free(c->digest->digest_str);
+ free(c->digest);
+ }
+ }
+ free(m->name);
+ free(m);
+
+ debug_return;
+}
+
+/*
+ * Free a tailq of members but not the struct member_list container itself.
+ */
+void
+free_members(struct member_list *members)
+{
+ struct member *m;
+ debug_decl(free_members, SUDOERS_DEBUG_PARSER)
+
+ while ((m = TAILQ_FIRST(members)) != NULL) {
+ TAILQ_REMOVE(members, m, entries);
+ free_member(m);
+ }
+
+ debug_return;
+}
+
+void
+free_defaults(struct defaults_list *defs)
+{
+ struct member_list *prev_binding = NULL;
+ struct defaults *def;
+ debug_decl(free_defaults, SUDOERS_DEBUG_PARSER)
+
+ while ((def = TAILQ_FIRST(defs)) != NULL) {
+ TAILQ_REMOVE(defs, def, entries);
+ free_default(def, &prev_binding);
+ }
+
+ debug_return;
+}
+
+void
+free_default(struct defaults *def, struct member_list **binding)
+{
+ debug_decl(free_default, SUDOERS_DEBUG_PARSER)
+
+ if (def->binding != *binding) {
+ *binding = def->binding;
+ if (def->binding != NULL) {
+ free_members(def->binding);
+ free(def->binding);
+ }
+ }
+ rcstr_delref(def->file);
+ free(def->var);
+ free(def->val);
+ free(def);
+
+ debug_return;
+}
+
+void
+free_privilege(struct privilege *priv)
+{
+ struct member_list *runasuserlist = NULL, *runasgrouplist = NULL;
+ struct member_list *prev_binding = NULL;
+ struct cmndspec *cs;
+ struct defaults *def;
+#ifdef HAVE_SELINUX
+ char *role = NULL, *type = NULL;
+#endif /* HAVE_SELINUX */
+#ifdef HAVE_PRIV_SET
+ char *privs = NULL, *limitprivs = NULL;
+#endif /* HAVE_PRIV_SET */
+ debug_decl(free_privilege, SUDOERS_DEBUG_PARSER)
+
+ free(priv->ldap_role);
+ free_members(&priv->hostlist);
+ while ((cs = TAILQ_FIRST(&priv->cmndlist)) != NULL) {
+ TAILQ_REMOVE(&priv->cmndlist, cs, entries);
+#ifdef HAVE_SELINUX
+ /* Only free the first instance of a role/type. */
+ if (cs->role != role) {
+ role = cs->role;
+ free(cs->role);
+ }
+ if (cs->type != type) {
+ type = cs->type;
+ free(cs->type);
+ }
+#endif /* HAVE_SELINUX */
+#ifdef HAVE_PRIV_SET
+ /* Only free the first instance of privs/limitprivs. */
+ if (cs->privs != privs) {
+ privs = cs->privs;
+ free(cs->privs);
+ }
+ if (cs->limitprivs != limitprivs) {
+ limitprivs = cs->limitprivs;
+ free(cs->limitprivs);
+ }
+#endif /* HAVE_PRIV_SET */
+ /* Only free the first instance of runas user/group lists. */
+ if (cs->runasuserlist && cs->runasuserlist != runasuserlist) {
+ runasuserlist = cs->runasuserlist;
+ free_members(runasuserlist);
+ free(runasuserlist);
+ }
+ if (cs->runasgrouplist && cs->runasgrouplist != runasgrouplist) {
+ runasgrouplist = cs->runasgrouplist;
+ free_members(runasgrouplist);
+ free(runasgrouplist);
+ }
+ free_member(cs->cmnd);
+ free(cs);
+ }
+ while ((def = TAILQ_FIRST(&priv->defaults)) != NULL) {
+ TAILQ_REMOVE(&priv->defaults, def, entries);
+ free_default(def, &prev_binding);
+ }
+ free(priv);
+
+ debug_return;
+}
+
+void
+free_userspecs(struct userspec_list *usl)
+{
+ struct userspec *us;
+ debug_decl(free_userspecs, SUDOERS_DEBUG_PARSER)
+
+ while ((us = TAILQ_FIRST(usl)) != NULL) {
+ TAILQ_REMOVE(usl, us, entries);
+ free_userspec(us);
+ }
+
+ debug_return;
+}
+
+void
+free_userspec(struct userspec *us)
+{
+ struct privilege *priv;
+ struct sudoers_comment *comment;
+ debug_decl(free_userspec, SUDOERS_DEBUG_PARSER)
+
+ free_members(&us->users);
+ while ((priv = TAILQ_FIRST(&us->privileges)) != NULL) {
+ TAILQ_REMOVE(&us->privileges, priv, entries);
+ free_privilege(priv);
+ }
+ while ((comment = STAILQ_FIRST(&us->comments)) != NULL) {
+ STAILQ_REMOVE_HEAD(&us->comments, entries);
+ free(comment->str);
+ free(comment);
+ }
+ rcstr_delref(us->file);
+ free(us);
+
+ debug_return;
+}
+
+/*
+ * Initialized a sudoers parse tree.
+ */
+void
+init_parse_tree(struct sudoers_parse_tree *parse_tree)
+{
+ TAILQ_INIT(&parse_tree->userspecs);
+ TAILQ_INIT(&parse_tree->defaults);
+ parse_tree->aliases = NULL;
+}
+
+/*
+ * Move the contents of parsed_policy to new_tree.
+ */
+void
+reparent_parse_tree(struct sudoers_parse_tree *new_tree)
+{
+ TAILQ_CONCAT(&new_tree->userspecs, &parsed_policy.userspecs, entries);
+ TAILQ_CONCAT(&new_tree->defaults, &parsed_policy.defaults, entries);
+ new_tree->aliases = parsed_policy.aliases;
+ parsed_policy.aliases = NULL;
+}
+
+/*
+ * Free the contents of a sudoers parse tree and initialize it.
+ */
+void
+free_parse_tree(struct sudoers_parse_tree *parse_tree)
+{
+ free_userspecs(&parse_tree->userspecs);
+ free_defaults(&parse_tree->defaults);
+ free_aliases(parse_tree->aliases);
+ parse_tree->aliases = NULL;
+}
+
+/*
+ * Free up space used by data structures from a previous parser run and sets
+ * the current sudoers file to path.
+ */
+bool
+init_parser(const char *path, bool quiet)
+{
+ bool ret = true;
+ debug_decl(init_parser, SUDOERS_DEBUG_PARSER)
+
+ free_parse_tree(&parsed_policy);
+ init_lexer();
+
+ rcstr_delref(sudoers);
+ if (path != NULL) {
+ if ((sudoers = rcstr_dup(path)) == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ ret = false;
+ }
+ } else {
+ sudoers = NULL;
+ }
+
+ parse_error = false;
+ errorlineno = -1;
+ rcstr_delref(errorfile);
+ errorfile = NULL;
+ sudoers_warnings = !quiet;
+
+ debug_return_bool(ret);
+}
+
+/*
+ * Initialize all options in a cmndspec.
+ */
+static void
+init_options(struct command_options *opts)
+{
+ opts->notbefore = UNSPEC;
+ opts->notafter = UNSPEC;
+ opts->timeout = UNSPEC;
+#ifdef HAVE_SELINUX
+ opts->role = NULL;
+ opts->type = NULL;
+#endif
+#ifdef HAVE_PRIV_SET
+ opts->privs = NULL;
+ opts->limitprivs = NULL;
+#endif
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 01:58:58 +0000