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91 lines
4.3 KiB
91 lines
4.3 KiB
From 76176de0889c3e8b9b3a176da24e4f8dbbd380a3 Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Wed, 2 Oct 2019 11:59:41 +0200
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Subject: [PATCH] basic/user-util: allow dots in user names
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(based on commit 1a29610f5fa1bcb2eeb37d2c6b79d8d1a6dbb865)
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Resolves: #1717603
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---
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src/basic/user-util.c | 9 ++++++---
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src/test/test-user-util.c | 8 ++++----
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2 files changed, 10 insertions(+), 7 deletions(-)
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diff --git a/src/basic/user-util.c b/src/basic/user-util.c
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index c533f67025..d92969c966 100644
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--- a/src/basic/user-util.c
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+++ b/src/basic/user-util.c
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@@ -575,11 +575,14 @@ bool valid_user_group_name(const char *u) {
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/* Checks if the specified name is a valid user/group name. Also see POSIX IEEE Std 1003.1-2008, 2016 Edition,
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* 3.437. We are a bit stricter here however. Specifically we deviate from POSIX rules:
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*
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- * - We don't allow any dots (this would break chown syntax which permits dots as user/group name separator)
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* - We require that names fit into the appropriate utmp field
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* - We don't allow empty user names
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*
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* Note that other systems are even more restrictive, and don't permit underscores or uppercase characters.
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+ *
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+ * jsynacek: We now allow dots in user names. The checks are not exhaustive as user names like "..." are allowed
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+ * and valid according to POSIX, but can't be created using useradd. However, ".user" can be created. Let's not
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+ * complicate the code by adding additional checks for weird corner cases like these, as they don't really matter here.
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*/
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if (isempty(u))
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@@ -587,14 +590,14 @@ bool valid_user_group_name(const char *u) {
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if (!(u[0] >= 'a' && u[0] <= 'z') &&
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!(u[0] >= 'A' && u[0] <= 'Z') &&
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- u[0] != '_')
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+ u[0] != '_' && u[0] != '.')
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return false;
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for (i = u+1; *i; i++) {
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if (!(*i >= 'a' && *i <= 'z') &&
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!(*i >= 'A' && *i <= 'Z') &&
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!(*i >= '0' && *i <= '9') &&
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- !IN_SET(*i, '_', '-'))
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+ !IN_SET(*i, '_', '-', '.'))
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return false;
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}
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diff --git a/src/test/test-user-util.c b/src/test/test-user-util.c
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index c1428fab02..9114d30b8c 100644
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--- a/src/test/test-user-util.c
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+++ b/src/test/test-user-util.c
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@@ -71,8 +71,6 @@ static void test_valid_user_group_name(void) {
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assert_se(!valid_user_group_name("-1"));
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assert_se(!valid_user_group_name("-kkk"));
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assert_se(!valid_user_group_name("rööt"));
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- assert_se(!valid_user_group_name("."));
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- assert_se(!valid_user_group_name("eff.eff"));
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assert_se(!valid_user_group_name("foo\nbar"));
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assert_se(!valid_user_group_name("0123456789012345678901234567890123456789"));
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assert_se(!valid_user_group_name_or_id("aaa:bbb"));
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@@ -83,6 +81,8 @@ static void test_valid_user_group_name(void) {
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assert_se(valid_user_group_name("_kkk"));
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assert_se(valid_user_group_name("kkk-"));
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assert_se(valid_user_group_name("kk-k"));
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+ assert_se(valid_user_group_name(".moo"));
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+ assert_se(valid_user_group_name("eff.eff"));
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assert_se(valid_user_group_name("some5"));
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assert_se(!valid_user_group_name("5some"));
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@@ -102,8 +102,6 @@ static void test_valid_user_group_name_or_id(void) {
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assert_se(!valid_user_group_name_or_id("-1"));
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assert_se(!valid_user_group_name_or_id("-kkk"));
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assert_se(!valid_user_group_name_or_id("rööt"));
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- assert_se(!valid_user_group_name_or_id("."));
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- assert_se(!valid_user_group_name_or_id("eff.eff"));
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assert_se(!valid_user_group_name_or_id("foo\nbar"));
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assert_se(!valid_user_group_name_or_id("0123456789012345678901234567890123456789"));
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assert_se(!valid_user_group_name_or_id("aaa:bbb"));
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@@ -114,6 +112,8 @@ static void test_valid_user_group_name_or_id(void) {
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assert_se(valid_user_group_name_or_id("_kkk"));
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assert_se(valid_user_group_name_or_id("kkk-"));
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assert_se(valid_user_group_name_or_id("kk-k"));
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+ assert_se(valid_user_group_name_or_id(".moo"));
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+ assert_se(valid_user_group_name_or_id("eff.eff"));
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assert_se(valid_user_group_name_or_id("some5"));
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assert_se(!valid_user_group_name_or_id("5some"));
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