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Fix regression in IPv6 hostnames parsing

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This commit is contained in:
Jakub Jelen 2023-12-22 13:06:35 +01:00
parent ef6352ea97
commit 69d2dd9eae
2 changed files with 265 additions and 0 deletions
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263
libssh-0.10.6-ipv6-hostname.patch Normal file
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@ -0,0 +1,263 @@
From 4f997aee7c7d7ea346b3e8ba505da0b7601ff318 Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Fri, 22 Dec 2023 10:32:40 +0100
Subject: [PATCH 1/2] Fix regression in IPv6 addresses in hostname parsing
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
---
include/libssh/config_parser.h | 11 ++++++++---
src/config.c | 4 ++--
src/config_parser.c | 16 +++++++++++-----
src/options.c | 10 ++--------
4 files changed, 23 insertions(+), 18 deletions(-)
diff --git a/include/libssh/config_parser.h b/include/libssh/config_parser.h
index a7dd42a2..ca353432 100644
--- a/include/libssh/config_parser.h
+++ b/include/libssh/config_parser.h
@@ -30,6 +30,8 @@
extern "C" {
#endif
+#include <stdbool.h>
+
char *ssh_config_get_cmd(char **str);
char *ssh_config_get_token(char **str);
@@ -49,14 +51,17 @@ int ssh_config_get_yesno(char **str, int notfound);
* be stored or NULL if we do not care about the result.
* @param[out] port Pointer to the location, where the new port will
* be stored or NULL if we do not care about the result.
+ * @param[in] ignore_port Set to true if the we should not attempt to parse
+ * port number.
*
* @returns SSH_OK if the provided string is in format of SSH URI,
* SSH_ERROR on failure
*/
int ssh_config_parse_uri(const char *tok,
- char **username,
- char **hostname,
- char **port);
+ char **username,
+ char **hostname,
+ char **port,
+ bool ignore_port);
#ifdef __cplusplus
}
diff --git a/src/config.c b/src/config.c
index 5eedbce9..7135c3b1 100644
--- a/src/config.c
+++ b/src/config.c
@@ -464,7 +464,7 @@ ssh_config_parse_proxy_jump(ssh_session session, const char *s, bool do_parsing)
}
if (parse_entry) {
/* We actually care only about the first item */
- rv = ssh_config_parse_uri(cp, &username, &hostname, &port);
+ rv = ssh_config_parse_uri(cp, &username, &hostname, &port, false);
/* The rest of the list needs to be passed on */
if (endp != NULL) {
next = strdup(endp + 1);
@@ -475,7 +475,7 @@ ssh_config_parse_proxy_jump(ssh_session session, const char *s, bool do_parsing)
}
} else {
/* The rest is just sanity-checked to avoid failures later */
- rv = ssh_config_parse_uri(cp, NULL, NULL, NULL);
+ rv = ssh_config_parse_uri(cp, NULL, NULL, NULL, false);
}
if (rv != SSH_OK) {
goto out;
diff --git a/src/config_parser.c b/src/config_parser.c
index 9ffc8b8b..5f30cd3e 100644
--- a/src/config_parser.c
+++ b/src/config_parser.c
@@ -162,9 +162,10 @@ int ssh_config_get_yesno(char **str, int notfound)
}
int ssh_config_parse_uri(const char *tok,
- char **username,
- char **hostname,
- char **port)
+ char **username,
+ char **hostname,
+ char **port,
+ bool ignore_port)
{
char *endp = NULL;
long port_n;
@@ -210,12 +211,17 @@ int ssh_config_parse_uri(const char *tok,
if (endp == NULL) {
goto error;
}
- } else {
- /* Hostnames or aliases expand to the last colon or to the end */
+ } else if (!ignore_port) {
+ /* Hostnames or aliases expand to the last colon (if port is requested)
+ * or to the end */
endp = strrchr(tok, ':');
if (endp == NULL) {
endp = strchr(tok, '\0');
}
+ } else {
+ /* If no port is requested, expand to the end of line
+ * (to accommodate the IPv6 addresses) */
+ endp = strchr(tok, '\0');
}
if (tok == endp) {
/* Zero-length hostnames are not valid */
diff --git a/src/options.c b/src/options.c
index 2e73be46..676c49e7 100644
--- a/src/options.c
+++ b/src/options.c
@@ -634,17 +634,11 @@ int ssh_options_set(ssh_session session, enum ssh_options_e type,
ssh_set_error_invalid(session);
return -1;
} else {
- char *username = NULL, *hostname = NULL, *port = NULL;
- rc = ssh_config_parse_uri(value, &username, &hostname, &port);
+ char *username = NULL, *hostname = NULL;
+ rc = ssh_config_parse_uri(value, &username, &hostname, NULL, true);
if (rc != SSH_OK) {
return -1;
}
- if (port != NULL) {
- SAFE_FREE(username);
- SAFE_FREE(hostname);
- SAFE_FREE(port);
- return -1;
- }
if (username != NULL) {
SAFE_FREE(session->opts.username);
session->opts.username = username;
--
2.43.0
From 6f6e453d7b0ad4ee6a6f6a1c96a9a6b27821410d Mon Sep 17 00:00:00 2001
From: Jakub Jelen <jjelen@redhat.com>
Date: Fri, 22 Dec 2023 09:52:18 +0100
Subject: [PATCH 2/2] tests: Increase test coverage for IPv6 address parsing as
hostnames
This was an issue in cockpit:
https://github.com/cockpit-project/cockpit/issues/19772
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
---
tests/unittests/torture_config.c | 49 +++++++++++++++++++++++++++++++
tests/unittests/torture_options.c | 16 ++++++++++
2 files changed, 65 insertions(+)
diff --git a/tests/unittests/torture_config.c b/tests/unittests/torture_config.c
index bc6b08f9..751aa126 100644
--- a/tests/unittests/torture_config.c
+++ b/tests/unittests/torture_config.c
@@ -2332,6 +2332,53 @@ static void torture_config_make_absolute_no_sshdir(void **state)
torture_config_make_absolute_int(state, 1);
}
+static void torture_config_parse_uri(void **state)
+{
+ char *username = NULL;
+ char *hostname = NULL;
+ char *port = NULL;
+ int rc;
+
+ (void)state; /* unused */
+
+ rc = ssh_config_parse_uri("localhost", &username, &hostname, &port, false);
+ assert_return_code(rc, errno);
+ assert_null(username);
+ assert_string_equal(hostname, "localhost");
+ SAFE_FREE(hostname);
+ assert_null(port);
+
+ rc = ssh_config_parse_uri("1.2.3.4", &username, &hostname, &port, false);
+ assert_return_code(rc, errno);
+ assert_null(username);
+ assert_string_equal(hostname, "1.2.3.4");
+ SAFE_FREE(hostname);
+ assert_null(port);
+
+ rc = ssh_config_parse_uri("1.2.3.4:2222", &username, &hostname, &port, false);
+ assert_return_code(rc, errno);
+ assert_null(username);
+ assert_string_equal(hostname, "1.2.3.4");
+ SAFE_FREE(hostname);
+ assert_string_equal(port, "2222");
+ SAFE_FREE(port);
+
+ rc = ssh_config_parse_uri("[1:2:3::4]:2222", &username, &hostname, &port, false);
+ assert_return_code(rc, errno);
+ assert_null(username);
+ assert_string_equal(hostname, "1:2:3::4");
+ SAFE_FREE(hostname);
+ assert_string_equal(port, "2222");
+ SAFE_FREE(port);
+
+ /* do not want port */
+ rc = ssh_config_parse_uri("1:2:3::4", &username, &hostname, NULL, true);
+ assert_return_code(rc, errno);
+ assert_null(username);
+ assert_string_equal(hostname, "1:2:3::4");
+ SAFE_FREE(hostname);
+}
+
int torture_run_tests(void)
{
int rc;
@@ -2424,6 +2471,8 @@ int torture_run_tests(void)
setup, teardown),
cmocka_unit_test_setup_teardown(torture_config_make_absolute_no_sshdir,
setup_no_sshdir, teardown),
+ cmocka_unit_test_setup_teardown(torture_config_parse_uri,
+ setup, teardown),
};
diff --git a/tests/unittests/torture_options.c b/tests/unittests/torture_options.c
index 5ba3bdc6..b07712d8 100644
--- a/tests/unittests/torture_options.c
+++ b/tests/unittests/torture_options.c
@@ -57,6 +57,20 @@ static void torture_options_set_host(void **state) {
assert_non_null(session->opts.host);
assert_string_equal(session->opts.host, "localhost");
+ /* IPv4 address */
+ rc = ssh_options_set(session, SSH_OPTIONS_HOST, "127.1.1.1");
+ assert_true(rc == 0);
+ assert_non_null(session->opts.host);
+ assert_string_equal(session->opts.host, "127.1.1.1");
+ assert_null(session->opts.username);
+
+ /* IPv6 address */
+ rc = ssh_options_set(session, SSH_OPTIONS_HOST, "::1");
+ assert_true(rc == 0);
+ assert_non_null(session->opts.host);
+ assert_string_equal(session->opts.host, "::1");
+ assert_null(session->opts.username);
+
rc = ssh_options_set(session, SSH_OPTIONS_HOST, "guru@meditation");
assert_true(rc == 0);
assert_non_null(session->opts.host);
@@ -64,12 +78,14 @@ static void torture_options_set_host(void **state) {
assert_non_null(session->opts.username);
assert_string_equal(session->opts.username, "guru");
+ /* more @ in uri is OK -- it should go to the username */
rc = ssh_options_set(session, SSH_OPTIONS_HOST, "at@login@hostname");
assert_true(rc == 0);
assert_non_null(session->opts.host);
assert_string_equal(session->opts.host, "hostname");
assert_non_null(session->opts.username);
assert_string_equal(session->opts.username, "at@login");
+
}
static void torture_options_set_ciphers(void **state) {
--
2.43.0

2
libssh.spec
View File

@ -11,6 +11,8 @@ Source2: https://cryptomilk.org/gpgkey-8DFF53E18F2ABC8D8F3C92237EE0FC4DCC
Source3: libssh_client.config
Source4: libssh_server.config
Patch1: libssh-0.10.6-rekey-timeout.patch
# https://gitlab.com/libssh/libssh-mirror/-/merge_requests/431
Patch2: libssh-0.10.6-ipv6-hostname.patch
BuildRequires: cmake
BuildRequires: gcc-c++