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sudo/backport-Do-not-rely-on-the-definition-of-ALLOW-DENY-being-tr.patch
qsw333 24edd57599 fix CVE-2023-42465
2024-01-10 10:21:39 +08:00

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From cf00568d888c90a8c5d06a06283bc87a45992933 Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@sudo.ws>
Date: Sat, 26 Aug 2023 10:32:37 -0600
Subject: [PATCH] Do not rely on the definition of ALLOW/DENY being true/false.
We now explicitly check for ALLOW and DENY when checking return
values and negating values.
Reference: https://github.com/sudo-project/sudo/commit/cf00568d888c90a8c5d06a06283bc87a45992933
Conflict: cvtsudoers.c match.c
---
plugins/sudoers/cvtsudoers.c | 6 +--
plugins/sudoers/match.c | 83 +++++++++++++++++++++++-------------
2 files changed, 57 insertions(+), 32 deletions(-)
diff --git a/plugins/sudoers/cvtsudoers.c b/plugins/sudoers/cvtsudoers.c
index 79558c3..8cedcc6 100644
--- a/plugins/sudoers/cvtsudoers.c
+++ b/plugins/sudoers/cvtsudoers.c
@@ -690,7 +690,7 @@ userlist_matches_filter(struct sudoers_parse_tree *parse_tree,
pw.pw_uid = (uid_t)-1;
pw.pw_gid = (gid_t)-1;
- if (user_matches(parse_tree, &pw, m) == true)
+ if (user_matches(parse_tree, &pw, m) == ALLOW)
matched = true;
} else {
STAILQ_FOREACH(s, &filters->users, entries) {
@@ -716,7 +716,7 @@ userlist_matches_filter(struct sudoers_parse_tree *parse_tree,
if (pw == NULL)
continue;
- if (user_matches(parse_tree, pw, m) == true)
+ if (user_matches(parse_tree, pw, m) == ALLOW)
matched = true;
sudo_pw_delref(pw);
@@ -792,7 +792,7 @@ hostlist_matches_filter(struct sudoers_parse_tree *parse_tree,
/* Only need one host in the filter to match. */
/* XXX - can't use netgroup_tuple with NULL pw */
- if (host_matches(parse_tree, NULL, lhost, shost, m) == true) {
+ if (host_matches(parse_tree, NULL, lhost, shost, m) == ALLOW) {
matched = true;
break;
}
diff --git a/plugins/sudoers/match.c b/plugins/sudoers/match.c
index 9801f38..9324159 100644
--- a/plugins/sudoers/match.c
+++ b/plugins/sudoers/match.c
@@ -76,31 +76,36 @@ user_matches(struct sudoers_parse_tree *parse_tree, const struct passwd *pw,
switch (m->type) {
case ALL:
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case NETGROUP:
if (netgr_matches(m->name,
def_netgroup_tuple ? lhost : NULL,
def_netgroup_tuple ? shost : NULL, pw->pw_name))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case USERGROUP:
if (usergr_matches(m->name, pw->pw_name, pw))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case ALIAS:
if ((a = alias_get(parse_tree, m->name, USERALIAS)) != NULL) {
/* XXX */
- int rc = userlist_matches(parse_tree, pw, &a->members);
- if (rc != UNSPEC)
- matched = m->negated ? !rc : rc;
+ const int rc = userlist_matches(parse_tree, pw, &a->members);
+ if (rc != UNSPEC) {
+ if (m->negated) {
+ matched = rc == ALLOW ? DENY : ALLOW;
+ } else {
+ matched = rc;
+ }
+ }
alias_put(a);
break;
}
FALLTHROUGH;
case WORD:
if (userpw_matches(m->name, pw->pw_name, pw))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
}
debug_return_int(matched);
@@ -171,38 +176,43 @@ runaslist_matches(struct sudoers_parse_tree *parse_tree,
TAILQ_FOREACH_REVERSE(m, user_list, member_list, entries) {
switch (m->type) {
case ALL:
- user_matched = !m->negated;
+ user_matched = m->negated ? DENY : ALLOW;
break;
case NETGROUP:
if (netgr_matches(m->name,
def_netgroup_tuple ? lhost : NULL,
def_netgroup_tuple ? shost : NULL,
runas_pw->pw_name))
- user_matched = !m->negated;
+ user_matched = m->negated ? DENY : ALLOW;
break;
case USERGROUP:
if (usergr_matches(m->name, runas_pw->pw_name, runas_pw))
- user_matched = !m->negated;
+ user_matched = m->negated ? DENY : ALLOW;
break;
case ALIAS:
a = alias_get(parse_tree, m->name, RUNASALIAS);
if (a != NULL) {
rc = runaslist_matches(parse_tree, &a->members,
&empty, matching_user, NULL);
- if (rc != UNSPEC)
- user_matched = m->negated ? !rc : rc;
+ if (rc != UNSPEC) {
+ if (m->negated) {
+ user_matched = rc == ALLOW ? DENY : ALLOW;
+ } else {
+ user_matched = rc;
+ }
+ }
alias_put(a);
break;
}
FALLTHROUGH;
case WORD:
if (userpw_matches(m->name, runas_pw->pw_name, runas_pw))
- user_matched = !m->negated;
+ user_matched = m->negated ? DENY : ALLOW;
break;
case MYSELF:
if (!ISSET(sudo_user.flags, RUNAS_USER_SPECIFIED) ||
strcmp(user_name, runas_pw->pw_name) == 0)
- user_matched = !m->negated;
+ user_matched = m->negated ? DENY : ALLOW;
break;
}
if (user_matched != UNSPEC) {
@@ -226,22 +236,27 @@ runaslist_matches(struct sudoers_parse_tree *parse_tree,
TAILQ_FOREACH_REVERSE(m, group_list, member_list, entries) {
switch (m->type) {
case ALL:
- group_matched = !m->negated;
+ group_matched = m->negated ? DENY : ALLOW;
break;
case ALIAS:
a = alias_get(parse_tree, m->name, RUNASALIAS);
if (a != NULL) {
rc = runaslist_matches(parse_tree, &empty,
&a->members, NULL, matching_group);
- if (rc != UNSPEC)
- group_matched = m->negated ? !rc : rc;
+ if (rc != UNSPEC) {
+ if (m->negated) {
+ group_matched = rc == ALLOW ? DENY : ALLOW;
+ } else {
+ group_matched = rc;
+ }
+ }
alias_put(a);
break;
}
FALLTHROUGH;
case WORD:
if (group_matches(m->name, runas_gr))
- group_matched = !m->negated;
+ group_matched = m->negated ? DENY : ALLOW;
break;
}
if (group_matched != UNSPEC) {
@@ -329,32 +344,37 @@ host_matches(struct sudoers_parse_tree *parse_tree, const struct passwd *pw,
switch (m->type) {
case ALL:
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case NETGROUP:
if (netgr_matches(m->name, lhost, shost,
def_netgroup_tuple ? pw->pw_name : NULL))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case NTWKADDR:
if (addr_matches(m->name))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case ALIAS:
a = alias_get(parse_tree, m->name, HOSTALIAS);
if (a != NULL) {
/* XXX */
- int rc = hostlist_matches_int(parse_tree, pw, lhost, shost,
- &a->members);
- if (rc != UNSPEC)
- matched = m->negated ? !rc : rc;
+ const int rc = hostlist_matches_int(parse_tree, pw, lhost,
+ shost, &a->members);
+ if (rc != UNSPEC) {
+ if (m->negated) {
+ matched = rc == ALLOW ? DENY : ALLOW;
+ } else {
+ matched = rc;
+ }
+ }
alias_put(a);
break;
}
FALLTHROUGH;
case WORD:
if (hostname_matches(shost, lhost, m->name))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
}
debug_return_int(matched);
@@ -399,14 +419,19 @@ cmnd_matches(struct sudoers_parse_tree *parse_tree, const struct member *m,
case COMMAND:
c = (struct sudo_command *)m->name;
if (command_matches(c->cmnd, c->args, runchroot, info, &c->digests))
- matched = !m->negated;
+ matched = m->negated ? DENY : ALLOW;
break;
case ALIAS:
a = alias_get(parse_tree, m->name, CMNDALIAS);
if (a != NULL) {
rc = cmndlist_matches(parse_tree, &a->members, runchroot, info);
- if (rc != UNSPEC)
- matched = m->negated ? !rc : rc;
+ if (rc != UNSPEC) {
+ if (m->negated) {
+ matched = rc == ALLOW ? DENY : ALLOW;
+ } else {
+ matched = rc;
+ }
+ }
alias_put(a);
}
break;
--
2.42.0.windows.2
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