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import mod_auth_mellon-0.14.0-9.el8

This commit is contained in:
CentOS Sources 2019-11-05 13:48:34 -05:00 committed by Andrew Lukoshko
parent 525e98697a
commit b4731cd814
3 changed files with 248 additions and 5 deletions
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44
SOURCES/0002-Fix-redirect-URL-validation-bypass.patch Normal file
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@ -0,0 +1,44 @@
From 62041428a32de402e0be6ba45fe12df6a83bedb8 Mon Sep 17 00:00:00 2001
From: Olav Morken <olav.morken@uninett.no>
Date: Tue, 19 Mar 2019 13:42:22 +0100
Subject: [PATCH] Fix redirect URL validation bypass
It turns out that browsers silently convert backslash characters into
forward slashes, while apr_uri_parse() does not.
This mismatch allows an attacker to bypass the redirect URL validation
by using an URL like:
https://sp.example.org/mellon/logout?ReturnTo=https:%5c%5cmalicious.example.org/
mod_auth_mellon will assume that it is a relative URL and allow the
request to pass through, while the browsers will use it as an absolute
url and redirect to https://malicious.example.org/ .
This patch fixes this issue by rejecting all redirect URLs with
backslashes.
---
auth_mellon_util.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/auth_mellon_util.c b/auth_mellon_util.c
index 0fab309..fd442f9 100644
--- a/auth_mellon_util.c
+++ b/auth_mellon_util.c
@@ -927,6 +927,13 @@ int am_check_url(request_rec *r, const char *url)
"Control character detected in URL.");
return HTTP_BAD_REQUEST;
}
+ if (*i == '\\') {
+ /* Reject backslash character, as it can be used to bypass
+ * redirect URL validation. */
+ AM_LOG_RERROR(APLOG_MARK, APLOG_ERR, HTTP_BAD_REQUEST, r,
+ "Backslash character detected in URL.");
+ return HTTP_BAD_REQUEST;
+ }
}
return OK;
--
2.19.2

172
SOURCES/0003-backport-Make-the-environment-variable-prefix-configurable.patch Normal file
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@ -0,0 +1,172 @@
diff -up mod_auth_mellon-0.14.0/auth_mellon_cache.c.env_prefix mod_auth_mellon-0.14.0/auth_mellon_cache.c
--- mod_auth_mellon-0.14.0/auth_mellon_cache.c.env_prefix 2017-10-02 11:44:08.000000000 +0200
+++ mod_auth_mellon-0.14.0/auth_mellon_cache.c 2019-06-10 09:46:36.806014513 +0200
@@ -589,7 +589,7 @@ void am_cache_env_populate(request_rec *
*/
for(i = 0; i < t->size; ++i) {
varname = am_cache_entry_get_string(t, &t->env[i].varname);
- varname_prefix = "MELLON_";
+ varname_prefix = d->env_prefix;
/* Check if we should map this name into another name. */
env_varname_conf = (am_envattr_conf_t *)apr_hash_get(
diff -up mod_auth_mellon-0.14.0/auth_mellon_config.c.env_prefix mod_auth_mellon-0.14.0/auth_mellon_config.c
--- mod_auth_mellon-0.14.0/auth_mellon_config.c.env_prefix 2018-03-16 08:14:54.000000000 +0100
+++ mod_auth_mellon-0.14.0/auth_mellon_config.c 2019-06-10 09:46:36.807014516 +0200
@@ -36,6 +36,11 @@ static const char *default_endpoint_path
*/
static const char *default_user_attribute = "NAME_ID";
+/* This is the default prefix to use for attributes received from the
+ * server. Customizable using the MellonEnvPrefix option
+ */
+static const char *default_env_prefix = "MELLON_";
+
/* This is the default name of the cookie which mod_auth_mellon will set.
* If you change this, then you should also update the description of the
* MellonVar configuration directive.
@@ -1372,8 +1377,10 @@ const command_rec auth_mellon_commands[]
am_set_setenv_slot,
NULL,
OR_AUTHCFG,
- "Renames attributes received from the server while retaining prefix MELLON_. The format is"
- " MellonSetEnv <old name> <new name>."
+ "Renames attributes received from the server while retaining the"
+ " prefix. The prefix defaults to MELLON_ but can be changed with"
+ " MellonEnvPrefix."
+ " The format is MellonSetEnv <old name> <new name>."
),
AP_INIT_TAKE2(
"MellonSetEnvNoPrefix",
@@ -1383,6 +1390,13 @@ const command_rec auth_mellon_commands[]
"Renames attributes received from the server without adding prefix. The format is"
" MellonSetEnvNoPrefix <old name> <new name>."
),
+ AP_INIT_TAKE1(
+ "MellonEnvPrefix",
+ ap_set_string_slot,
+ (void *)APR_OFFSETOF(am_dir_cfg_rec, env_prefix),
+ OR_AUTHCFG,
+ "The prefix to use for attributes received from the server."
+ ),
AP_INIT_FLAG(
"MellonSessionDump",
ap_set_flag_slot,
@@ -1714,6 +1728,7 @@ void *auth_mellon_dir_config(apr_pool_t
dir->cookie_path = NULL;
dir->cookie_samesite = am_samesite_default;
dir->envattr = apr_hash_make(p);
+ dir->env_prefix = default_env_prefix;
dir->userattr = default_user_attribute;
dir->idpattr = NULL;
dir->signature_method = inherit_signature_method;
@@ -1868,6 +1883,10 @@ void *auth_mellon_dir_merge(apr_pool_t *
add_cfg->envattr :
base_cfg->envattr);
+ new_cfg->env_prefix = (add_cfg->env_prefix != default_env_prefix ?
+ add_cfg->env_prefix :
+ base_cfg->env_prefix);
+
new_cfg->userattr = (add_cfg->userattr != default_user_attribute ?
add_cfg->userattr :
base_cfg->userattr);
diff -up mod_auth_mellon-0.14.0/auth_mellon_diagnostics.c.env_prefix mod_auth_mellon-0.14.0/auth_mellon_diagnostics.c
--- mod_auth_mellon-0.14.0/auth_mellon_diagnostics.c.env_prefix 2018-03-16 08:14:54.000000000 +0100
+++ mod_auth_mellon-0.14.0/auth_mellon_diagnostics.c 2019-06-10 09:46:36.808014518 +0200
@@ -442,6 +442,9 @@ am_diag_log_dir_cfg(request_rec *r, int
"%sMellonCookieSameSite (cookie_samesite): %s\n",
indent(level+1),
am_diag_samesite_str(r, cfg->cookie_samesite));
+ apr_file_printf(diag_cfg->fd,
+ "%sMellonEnvPrefix (env_prefix): %s\n",
+ indent(level+1), cfg->env_prefix);
apr_file_printf(diag_cfg->fd,
"%sMellonCond (cond): %d items\n",
@@ -466,7 +469,7 @@ am_diag_log_dir_cfg(request_rec *r, int
apr_hash_this(hash_item, (void *)&key, NULL, (void *)&envattr_conf);
if (envattr_conf->prefixed) {
- name = apr_pstrcat(r->pool, "MELLON_",
+ name = apr_pstrcat(r->pool, cfg->env_prefix,
envattr_conf->name, NULL);
} else {
name = envattr_conf->name;
diff -up mod_auth_mellon-0.14.0/auth_mellon.h.env_prefix mod_auth_mellon-0.14.0/auth_mellon.h
--- mod_auth_mellon-0.14.0/auth_mellon.h.env_prefix 2018-03-16 08:14:54.000000000 +0100
+++ mod_auth_mellon-0.14.0/auth_mellon.h 2019-06-10 09:46:36.805014510 +0200
@@ -237,6 +237,7 @@ typedef struct am_dir_cfg_rec {
am_samesite_t cookie_samesite;
apr_array_header_t *cond;
apr_hash_t *envattr;
+ const char *env_prefix;
const char *userattr;
const char *idpattr;
LassoSignatureMethod signature_method;
diff -up mod_auth_mellon-0.14.0/doc/user_guide/mellon_user_guide.adoc.env_prefix mod_auth_mellon-0.14.0/doc/user_guide/mellon_user_guide.adoc
--- mod_auth_mellon-0.14.0/doc/user_guide/mellon_user_guide.adoc.env_prefix 2018-03-16 08:14:54.000000000 +0100
+++ mod_auth_mellon-0.14.0/doc/user_guide/mellon_user_guide.adoc 2019-06-10 09:48:08.422237471 +0200
@@ -2007,11 +2007,13 @@ attributes.
assertion to a name of your choosing when it is placed in the Apache
environment. This is controlled by `MellonSetEnv` and
`MellonSetEnvNoPrefix` directives. The distinction
- is `MellonSetEnv` always prepends the `MELLON_` prefix to the
+ is `MellonSetEnv` always prepends a prefix to the
environment variable name to help to prevent name collisions. The
+ prefix defaults to `MELLON_` and can be configured using the
+ `MellonEnvPrefix` configuration option. The
`MellonSetEnvNoPrefix` directive also remaps the assertion name to a
name of your choosing but it omits prepending the environment
- variable name with `MELLON_`. See <<map_assertion_attr_name>>
+ variable name with the prefix. See <<map_assertion_attr_name>>
Using the <<assertion_response,assertion example>> Mellon places these
environment variables in the Apache environment. See
@@ -2096,10 +2098,12 @@ and `MellonSetEnvNoPrefix` directives. T
assertion attribute to a name of your choosing. The `MellonSetEnv`
directive follows the same convention as all other assertion
attributes added by Mellon in that it always prefixes the environment
-variable name with `MELLON_` to help avoid name collisions in the
+variable name with a configurable prefix, which defaults to `MELLON_` to help avoid name collisions in the
Apache environment. However sometimes you do not want the `MELLON_`
-prefix added and instead you want to use exactly the environment
-variable name as specified., `MellonSetEnvNoPrefix` serves this role.
+prefix added. In case you simply want the variables prefixed with
+a different string, use the `MellonEnvPrefix` configuration option. If,
+instead you want to use exactly the environment variable name as specified.,
+`MellonSetEnvNoPrefix` serves this role.
To illustrate let's look at an example. Suppose your web app is
expecting an attribute which is the user's last name, specifically it
@@ -2117,6 +2121,15 @@ MellonSetEnvNoPrefix REMOTE_USER_LASTNAM
Also see <<set_remote_user>> for an example of setting the `REMOTE_USER`
environment variable using `MellonSetEnvNoPrefix`.
+The `MellonEnvPrefix` variable might be useful e.g. if you
+are migrating from a different SP which used its own prefix
+for the variables passed by the IdP. For example, to prefix
+all variables with `NOLLEM_` you would use:
+
+----
+MellonEnvPrefix NOLLEM_
+----
+
=== Using Mellon to apply constraints [[assertion_constraints]]
SAML attributes can be used for more than exporting those values to a
diff -up mod_auth_mellon-0.14.0/README.md.env_prefix mod_auth_mellon-0.14.0/README.md
--- mod_auth_mellon-0.14.0/README.md.env_prefix 2018-03-16 08:14:54.000000000 +0100
+++ mod_auth_mellon-0.14.0/README.md 2019-06-10 09:46:36.805014510 +0200
@@ -253,6 +253,11 @@ MellonDiagnosticsEnable Off
# Default. None set.
MellonSetEnvNoPrefix "DISPLAY_NAME" "displayName"
+ # MellonEnvPrefix changes the string the variables passed from the
+ # IdP are prefixed with.
+ # Default: MELLON_
+ MellonEnvPrefix "NOLLEM_"
+
# MellonMergeEnvVars merges multiple values of environment variables
# set using MellonSetEnv into single variable:
# ie: MYENV_VAR => val1;val2;val3 instead of default behaviour of:

37
SPECS/mod_auth_mellon.spec
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@ -1,7 +1,7 @@
Summary: A SAML 2.0 authentication module for the Apache Httpd Server
Name: mod_auth_mellon
Version: 0.14.0
Release: 3%{?dist}.2
Release: 9%{?dist}
Group: System Environment/Daemons
Source0: https://github.com/UNINETT/mod_auth_mellon/releases/download/v%{version}/%{name}-%{version}.tar.gz
Source1: auth_mellon.conf
@ -23,6 +23,8 @@ Requires: lasso >= 2.5.1
Url: https://github.com/UNINETT/mod_auth_mellon
Patch0001: 0001-Modify-am_handler-setup-to-run-before-mod_proxy.patch
Patch0002: 0002-Fix-redirect-URL-validation-bypass.patch
Patch0003: 0003-backport-Make-the-environment-variable-prefix-configurable.patch
# FIXME: RHEL-7 does not have rubygem-asciidoctor, only asciidoc. However,
# I could not get asciidoc to render properly so instead I generated
@ -38,6 +40,8 @@ received in assertions generated by a IdP server.
%prep
%setup -q -n %{name}-%{version}
%patch1 -p1
%patch2 -p1
%patch3 -p1
%build
export APXS=%{_httpd_apxs}
@ -105,12 +109,35 @@ in the doc directory for instructions on using the diagnostics build.
%{_httpd_moddir}/mod_auth_mellon.so
%{_tmpfilesdir}/mod_auth_mellon.conf
%{_libexecdir}/%{name}
%dir /run/%{name}/
%attr(0755,apache,apache) %dir /run/%{name}/
%changelog
* Tue Apr 16 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-3.2
- Resolves: rhbz#1696197 - CVE-2019-3878 mod_auth_mellon: authentication
bypass in ECP flow [rhel-8.0.0.z]
* Thu Jun 13 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-9
- Just bump the release number
- Related: rhbz#1718238 - mod_auth_mellon-diagnostics RPM not in product
listings
* Fri Jun 7 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-8
- Resolves: rhbz#1691894 - [RFE] Config option to change mod_auth_mellon prefix
* Fri Jun 7 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-7
- Apply the patch from the previous commit
- Resolves: rhbz#1692471 - CVE-2019-3877 appstream/mod_auth_mellon: open
redirect in logout url when using URLs with
backslashes [rhel-8]
* Fri Jun 7 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-6
- Resolves: rhbz#1692471 - CVE-2019-3877 appstream/mod_auth_mellon: open
redirect in logout url when using URLs with
backslashes [rhel-8]
* Fri Jun 7 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-5
- Resolves: rhbz#1692457 - CVE-2019-3878 mod_auth_mellon: authentication
bypass in ECP flow [rhel-8.1.0]
* Wed Apr 24 2019 Jakub Hrozek <jhrozek@redhat.com> - 0.14.0-4
- Resolves: rhbz#1702695 - fresh install of mod_auth_mellon shows rpm
verification warnings
* Mon Jul 30 2018 Florian Weimer <fweimer@redhat.com> - 0.14.0-3
- Rebuild with fixed binutils