Apache module mod_auth_fixup.HEADmod_auth_fixup-0.5master

6 files changed, 585 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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diff --git a/README b/README
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+
+Apache module mod_auth_fixup
+============================
+
+Apache module mod_auth_fixup uses results of previous authentication
+and other phases and checks that user was authenticated, optionally
+updating the user identifier with a substring based on regular
+expression match.
+
+Possible use is processing result of mod_ssl's operation on Apache 2.2.
+Module mod_ssl has SSLVerifyClient require mechanism which sets the
+user identifier and it is not proper authentication module to the rest
+of Apache HTTP Server internals. That makes it hard to combine
+mod_ssl with authorization modules to check additional attributes
+of the authenticated user.
+
+Module configuration
+--------------------
+
+Let us assume we have mod_ssl configured with client authentication:
+
+    <Location /login>
+	SSLVerifyClient require
+	SSLVerifyDepth 1
+	SSLOptions +StrictRequire
+	SSLUserName SSL_CLIENT_S_DN_CN
+    </Location>
+
+The access will only be allowed if the client certificate can be
+verified by mod_ssl, and the authenticated user identifier will be
+the content of client's Subject DN's common name. In access log
+we will see the CN value as the user identifier.
+
+Often, there are two issues with that situation:
+
+1) On Apache 2.2, when we try to use the result of such authentication
+   for example with Require, like
+
+	Require group admins
+
+   or even plain
+
+	Require valid-user
+
+   we will get an error:
+
+	configuration error:  couldn't perform authentication.
+	AuthType not set!
+
+   It's because mod_ssl does not run the standard authentication
+   handler.
+
+   By adding
+
+	AuthType Fixup
+
+   to the configuration, mod_auth_fixup takes the role of the
+   authentication handler, even if it does not do anything else than
+   checking that the result of the mod_ssl operation, the user
+   identifier it has left in the internal r->user, set.
+
+   Of course, any other module could have set the user identification,
+   not just mod_ssl, and mod_auth_fixup would process it just fine.
+
+2) The Common Name field of the Subject DN is often filled with
+   structured information, and for the subsequent authorization phase,
+   only a substring of that might be the actual user identification
+   in the identity management setup used.
+
+   For that, AuthFixupRegexp directive can specify regular expression
+   to match the user identifier against, and substitution string. When
+   the user identifier matches, it is the updated with the new value,
+   and this new value will be then shown in the access log and
+   available to later authorization phases. So for example,
+
+	AuthFixupRegexp userid=(.+?); user$1
+
+   will make sure the user identifier contains substring
+
+	userid=<the-identifier>;
+
+   and the nonempty string between userid= and the first semicolon
+   will replace the $1 part in the substitution string. Note that
+   the first part of the requirement matched by the above
+   AuthFixupRegexp example could be handled by
+
+	SSLRequire %{SSL_CLIENT_S_DN_CN} =~ m/userid=.+?;/
+
+   But there is no way to extract the identifier with SSLRequire (and
+   to add Require to it in Apache 2.2).
+
+   When AuthFixupRegexp is not specified, it is effectively equivalent
+   to
+
+	AuthFixupRegexp .+ $0
+
+The full example configuration might then be:
+
+    <Location /login>
+	SSLVerifyClient require
+	SSLVerifyDepth 1
+	SSLOptions +StrictRequire
+	SSLUserName SSL_CLIENT_S_DN_CN
+
+	AuthType Fixup
+	AuthFixupRegexp userid=(.+?); user$1
+	Require group admins
+    </Location>
+
+Building from sources
+---------------------
+
+When building from sources, command
+
+    apxs -i -a -c mod_auth_fixup.c -Wall -pedantic
+
+should build and install the module.
+
+License
+-------
+
+Copyright 2015 Jan Pazdziora
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
diff --git a/auth_fixup.conf b/auth_fixup.conf
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+++ b/auth_fixup.conf
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+
+# <Location /login>
+# SSLVerifyClient require
+# SSLVerifyDepth 1
+# SSLOptions +StrictRequire
+# SSLUserName SSL_CLIENT_S_DN_CN
+#
+# AuthType Fixup
+# AuthFixupRegexp userid=(.+?);
+# Require group admins
+# </Location>
+
diff --git a/auth_fixup.module b/auth_fixup.module
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--- /dev/null
+++ b/auth_fixup.module
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+
+# LoadModule auth_fixup_module modules/mod_auth_fixup.so
+
diff --git a/mod_auth_fixup.c b/mod_auth_fixup.c
new file mode 100644
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--- /dev/null
+++ b/mod_auth_fixup.c
@@ -0,0 +1,163 @@
+
+/*
+ * Copyright 2015 Jan Pazdziora
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "httpd.h"
+#include "http_core.h"
+#include "http_config.h"
+#include "http_log.h"
+#include "http_request.h"
+
+#include "ap_regex.h"
+#include "apr_strings.h"
+
+typedef struct {
+	const char * regexp_str;
+	ap_regex_t * regexp;
+	const char * substitution_str;
+} auth_fixup_config_rec;
+
+static void * create_dir_conf(apr_pool_t * pool, char * dir) {
+	auth_fixup_config_rec * cfg
+			= apr_pcalloc(pool, sizeof(auth_fixup_config_rec));
+	return cfg;
+}
+
+static const char * set_regexp(cmd_parms * cmd, void * struct_ptr,
+	const char * arg, const char * arg2) {
+        auth_fixup_config_rec * cfg = (auth_fixup_config_rec *) struct_ptr;
+        if (cfg) {
+		cfg->regexp = ap_pregcomp(cmd->pool, arg, AP_REG_EXTENDED);
+		if (cfg->regexp == NULL) {
+			return "Regular expression could not be compiled.";
+		}
+		cfg->regexp_str = apr_pstrdup(cmd->pool, arg);
+		if (arg2) {
+			cfg->substitution_str = apr_pstrdup(cmd->pool, arg2);
+		}
+        }
+        return NULL;
+}
+
+static const command_rec auth_fixup_cmds[] = {
+	AP_INIT_TAKE12("AuthFixupRegexp", set_regexp, NULL, OR_AUTHCFG,
+		"Regular expression to match against r->user, "
+		"and optional substitution string with backreferences"),
+	{NULL}
+};
+
+static int pretend_auth_type(request_rec *r) {
+	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, "pretend_auth_type: called with r->user [%s]", r->user);
+	const char *auth_type = ap_auth_type(r);
+	if (! auth_type || strcasecmp(auth_type, "Fixup")) {
+		return DECLINED;
+	}
+	if (r->user) {
+		return OK;
+	}
+	return DECLINED;
+}
+
+module AP_MODULE_DECLARE_DATA auth_fixup_module;
+static int fixup_user(request_rec *r) {
+	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, "fixup_user: called with r->user [%s]", r->user);
+	if (apr_table_get(r->notes, "fixup-user-already-run")) {
+		ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, "fixup_user: already run in this request, declining");
+		return DECLINED;
+	}
+
+	auth_fixup_config_rec *conf
+		= ap_get_module_config(r->per_dir_config, &auth_fixup_module);
+	if (pretend_auth_type(r) == OK) {
+		if (!r->user) {
+			ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
+				"fixup_user: AuthType Fixup configured and no r->user found, forbidden"
+				);
+			return HTTP_FORBIDDEN;
+		}
+	}
+	if (!r->user) {
+		ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, "fixup_user: declining, no r->user");
+		return DECLINED;
+	}
+	apr_table_setn(r->notes, "fixup-user-already-run", r->user);
+	if (!conf->regexp) {
+		ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL, "fixup_user: declining, no conf->regexp");
+		return DECLINED;
+	}
+
+	unsigned int nmatch = AP_MAX_REG_MATCH;
+	ap_regmatch_t pmatch[AP_MAX_REG_MATCH];
+	if (ap_regexec(conf->regexp, r->user, nmatch, pmatch, 0)) {
+		ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
+			"fixup_user: matching [%s] =~ m/%s/ failed, forbidden",
+			r->user, conf->regexp_str);
+		return HTTP_FORBIDDEN;
+	}
+
+	char * new_user = ap_pregsub(r->pool,
+		( conf->substitution_str ? conf->substitution_str : "$0" ),
+		r->user, nmatch, pmatch);
+	if (! new_user) {
+		ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
+			"fixup_user: substitution [%s] =~ /%s/ -> [%s] failed, internal server error",
+			r->user, conf->regexp_str, conf->substitution_str);
+		return HTTP_INTERNAL_SERVER_ERROR;
+	}
+	if (! *new_user) {
+		ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
+			"fixup_user: substitution [%s] =~ /%s/ -> [%s] resulted in "
+			"empty string, forbidden",
+			r->user, conf->regexp_str, conf->substitution_str);
+		return HTTP_FORBIDDEN;
+	}
+
+	ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, NULL,
+		"fixup_user: resetting user [%s] to [%s]", r->user, new_user);
+	r->user = new_user;
+	return DECLINED;
+}
+
+
+static void register_hooks(apr_pool_t * p) {
+#if AP_MODULE_MAGIC_AT_LEAST(20111025,3)
+	static const char * const aszSucc[] = {"mod_authz_core.c",
+						"mod_lookup_identity.c", NULL};
+	static const char * const aszPred[] = {"mod_ssl.c", NULL};
+	ap_hook_check_access(fixup_user, aszPred, aszSucc, APR_HOOK_MIDDLE,
+					AP_AUTH_INTERNAL_PER_CONF);
+	ap_hook_check_authz(fixup_user, NULL, NULL, APR_HOOK_REALLY_FIRST,
+					AP_AUTH_INTERNAL_PER_CONF);
+	ap_hook_check_user_id(pretend_auth_type, NULL, NULL,
+							APR_HOOK_REALLY_FIRST);
+
+#else
+	static const char * const aszSucc[] = {"mod_authn_default.c", NULL};
+	ap_hook_check_user_id(pretend_auth_type, NULL, aszSucc, APR_HOOK_LAST);
+	ap_hook_auth_checker(fixup_user, NULL, NULL, APR_HOOK_REALLY_FIRST);
+#endif
+}
+
+module AP_MODULE_DECLARE_DATA auth_fixup_module = {
+	STANDARD20_MODULE_STUFF,
+	create_dir_conf,	/* Per-directory configuration handler */
+	NULL,			/* Merge handler for per-directory configurations */
+	NULL,			/* Per-server configuration handler */
+	NULL,			/* Merge handler for per-server configurations */
+	auth_fixup_cmds,	/* Any directives we may have for httpd */
+	register_hooks		/* Our hook registering function */
+};
+
diff --git a/mod_auth_fixup.spec b/mod_auth_fixup.spec
new file mode 100644
index 0000000..efbb4b4
--- /dev/null
+++ b/mod_auth_fixup.spec
@@ -0,0 +1,70 @@
+%{!?_httpd_mmn: %{expand: %%global _httpd_mmn %%(cat %{_includedir}/httpd/.mmn || echo 0-0)}}
+%{!?_httpd_apxs:       %{expand: %%global _httpd_apxs       %%{_sbindir}/apxs}}
+%{!?_httpd_confdir:    %{expand: %%global _httpd_confdir    %%{_sysconfdir}/httpd/conf.d}}
+# /etc/httpd/conf.d with httpd < 2.4 and defined as /etc/httpd/conf.modules.d with httpd >= 2.4
+%{!?_httpd_modconfdir: %{expand: %%global _httpd_modconfdir %%{_sysconfdir}/httpd/conf.d}}
+%{!?_httpd_moddir:    %{expand: %%global _httpd_moddir    %%{_libdir}/httpd/modules}}
+
+Summary: Check and update result of previous authentication
+Name: mod_auth_fixup
+Version: 0.5
+Release: 1%{?dist}
+License: ASL 2.0
+Group: System Environment/Daemons
+URL: http://www.adelton.com/apache/mod_auth_fixup/
+Source0: http://www.adelton.com/apache/mod_auth_fixup/%{name}-%{version}.tar.gz
+BuildRequires: httpd-devel
+BuildRequires: pkgconfig
+Requires(pre): httpd
+Requires: httpd-mmn = %{_httpd_mmn}
+
+# Suppres auto-provides for module DSO per
+# https://fedoraproject.org/wiki/Packaging:AutoProvidesAndRequiresFiltering#Summary
+%{?filter_provides_in: %filter_provides_in %{_libdir}/httpd/modules/.*\.so$}
+%{?filter_setup}
+
+%description
+mod_auth_fixup is an authentication module which checks if user
+identifier which is the result of previous authentication phases
+matches regular expression, optionally updating the identifier.
+Another possible use is on Apache 2.2, processing result of
+mod_ssl's operation which with SSLVerifyClient require provides
+identifier of the user but since mod_ssl is not proper
+authentication module, it cannot easily be combined with
+authorization modules.
+
+%prep
+%setup -q -n %{name}-%{version}
+
+%build
+%{_httpd_apxs} -c -Wc,"%{optflags} -Wall -pedantic -std=c99" mod_auth_fixup.c
+%if "%{_httpd_modconfdir}" != "%{_httpd_confdir}"
+echo > auth_fixup.confx
+echo "# Load the module in %{_httpd_modconfdir}/55-auth_fixup.conf" >> auth_fixup.confx
+cat auth_fixup.conf >> auth_fixup.confx
+%else
+cat auth_fixup.module > auth_fixup.confx
+cat auth_fixup.conf >> auth_fixup.confx
+%endif
+
+%install
+rm -rf $RPM_BUILD_ROOT
+install -Dm 755 .libs/mod_auth_fixup.so $RPM_BUILD_ROOT%{_httpd_moddir}/mod_auth_fixup.so
+
+%if "%{_httpd_modconfdir}" != "%{_httpd_confdir}"
+# httpd >= 2.4.x
+install -Dp -m 0644 auth_fixup.module $RPM_BUILD_ROOT%{_httpd_modconfdir}/55-auth_fixup.conf
+%endif
+install -Dp -m 0644 auth_fixup.confx $RPM_BUILD_ROOT%{_httpd_confdir}/auth_fixup.conf
+
+%files
+%doc README LICENSE
+%if "%{_httpd_modconfdir}" != "%{_httpd_confdir}"
+%config(noreplace) %{_httpd_modconfdir}/55-auth_fixup.conf
+%endif
+%config(noreplace) %{_httpd_confdir}/auth_fixup.conf
+%{_httpd_moddir}/*.so
+
+%changelog
+* Thu Apr 23 2015 Jan Pazdziora <jpazdziora@redhat.com> - 0.5-1
+- Initial release.