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modmellon/auth_mellon.h

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/*
*
* auth_mellon.h: an authentication apache module
* Copyright © 2003-2007 UNINETT (http://www.uninett.no/)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef MOD_AUTH_MELLON_H
#define MOD_AUTH_MELLON_H
#include "config.h"
#include <stdbool.h>
#include <strings.h>
#include <lasso/lasso.h>
#include <lasso/xml/saml-2.0/samlp2_authn_request.h>
#include <lasso/xml/saml-2.0/samlp2_logout_request.h>
#include <lasso/xml/saml-2.0/samlp2_response.h>
#include <lasso/xml/saml-2.0/saml2_assertion.h>
#include <lasso/xml/saml-2.0/saml2_attribute_statement.h>
#include <lasso/xml/saml-2.0/saml2_attribute.h>
#include <lasso/xml/saml-2.0/saml2_attribute_value.h>
#include <lasso/xml/saml-2.0/saml2_authn_statement.h>
#include <lasso/xml/saml-2.0/saml2_audience_restriction.h>
#include <lasso/xml/misc_text_node.h>
#include "lasso_compat.h"
/* The following are redefined in ap_config_auto.h */
#undef PACKAGE_BUGREPORT
#undef PACKAGE_NAME
#undef PACKAGE_STRING
#undef PACKAGE_TARNAME
#undef PACKAGE_VERSION
#undef HAVE_TIMEGM /* is redefined again in ap_config.h */
#include "apr_base64.h"
#include "apr_time.h"
#include "apr_strings.h"
#include "apr_shm.h"
#include "apr_md5.h"
#include "apr_file_info.h"
#include "apr_file_io.h"
#include "apr_xml.h"
#include "apr_lib.h"
#include "apr_fnmatch.h"
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h"
#include "mod_ssl.h"
/* Backwards-compatibility helpers. */
#include "auth_mellon_compat.h"
/* Size definitions for the session cache.
*/
#define AM_CACHE_KEYSIZE 120
#define AM_CACHE_ENVSIZE 2048
#define AM_CACHE_USERSIZE 512
#define AM_CACHE_DEFAULT_ENTRY_SIZE 196608
#define AM_CACHE_MIN_ENTRY_SIZE 65536
/* Internal error codes */
#define AM_ERROR_INVALID_PAOS_HEADER 1
#define AM_ERROR_MISSING_PAOS_HEADER 2
#define AM_ERROR_MISSING_PAOS_MEDIA_TYPE 3
#ifdef ENABLE_DIAGNOSTICS
typedef enum {
AM_DIAG_FLAG_ENABLED = (1 << 0),
AM_DIAG_FLAG_DISABLE = 0,
AM_DIAG_FLAG_ENABLE_ALL = ~0,
} am_diag_flags_t;
#endif
/* This is the length of the id we use (for session IDs and
* replaying POST data).
*/
#define AM_ID_LENGTH 32
#define MEDIA_TYPE_PAOS "application/vnd.paos+xml"
#define am_get_srv_cfg(s) (am_srv_cfg_rec *)ap_get_module_config((s)->module_config, &auth_mellon_module)
#define am_get_mod_cfg(s) (am_get_srv_cfg((s)))->mc
#define am_get_dir_cfg(r) (am_dir_cfg_rec *)ap_get_module_config((r)->per_dir_config, &auth_mellon_module)
#define am_get_req_cfg(r) (am_req_cfg_rec *)ap_get_module_config((r)->request_config, &auth_mellon_module)
#ifdef ENABLE_DIAGNOSTICS
#define am_get_diag_cfg(s) (&(am_get_srv_cfg((s)))->diag_cfg)
#endif
typedef struct am_mod_cfg_rec {
int cache_size;
const char *lock_file;
const char *post_dir;
apr_time_t post_ttl;
int post_count;
apr_size_t post_size;
int entry_size;
/* These variables can't be allowed to change after the session store
* has been initialized. Therefore we copy them before initializing
* the session store.
*/
int init_cache_size;
const char *init_lock_file;
apr_size_t init_entry_size;
apr_shm_t *cache;
apr_global_mutex_t *lock;
} am_mod_cfg_rec;
#ifdef ENABLE_DIAGNOSTICS
typedef struct am_diag_cfg_rec {
const char *filename;
apr_file_t *fd;
am_diag_flags_t flags;
apr_table_t *dir_cfg_emitted;
} am_diag_cfg_rec;
#endif
typedef struct am_srv_cfg_rec {
am_mod_cfg_rec *mc;
#ifdef ENABLE_DIAGNOSTICS
am_diag_cfg_rec diag_cfg;
#endif
} am_srv_cfg_rec;
typedef enum {
am_enable_default,
am_enable_off,
am_enable_info,
am_enable_auth
} am_enable_t;
typedef enum {
am_samesite_default,
am_samesite_lax,
am_samesite_strict
} am_samesite_t;
typedef enum {
AM_COND_FLAG_NULL = 0x000, /* No flags */
AM_COND_FLAG_OR = 0x001, /* Or with next condition */
AM_COND_FLAG_NOT = 0x002, /* Negate this condition */
AM_COND_FLAG_REG = 0x004, /* Condition is regex */
AM_COND_FLAG_NC = 0x008, /* Case insensitive match */
AM_COND_FLAG_MAP = 0x010, /* Try to use attribute name from MellonSetEnv */
AM_COND_FLAG_REF = 0x020, /* Set regex backreferences */
AM_COND_FLAG_SUB = 0x040, /* Substring match */
/* The other options are internally used */
AM_COND_FLAG_IGN = 0x1000, /* Condition is to be ignored */
AM_COND_FLAG_REQ = 0x2000, /* Condition was set using MellonRequire */
AM_COND_FLAG_FSTR = 0x4000, /* Value contains a format string */
} am_cond_flag_t;
extern const char *am_cond_options[];
/*
* am_file_data_t is used to maintain information about a file:
*
* * The filesystem pathname
* * Stat information about the file (e.g. type, size, times, etc.)
* * If and when the file was stat'ed or read
* * Error code of failed operation and error string description
* * Contents of the file
* * Flag indicating if contents were generated instead of being read
* from a file.
*/
typedef struct am_file_data_t {
apr_pool_t *pool; /* allocation pool */
const char *path; /* filesystem pathname, NULL for generated file */
apr_time_t stat_time; /* when stat was performed, zero indicates never */
apr_finfo_t finfo; /* stat data */
char *contents; /* file contents */
apr_time_t read_time; /* when contents was read, zero indicates never */
apr_status_t rv; /* most recent result value */
const char *strerror; /* if rv is error then this is error description */
bool generated; /* true if contents generated instead of being
read from path */
} am_file_data_t;
typedef struct {
const char *varname;
int flags;
const char *str;
ap_regex_t *regex;
const char *directive;
} am_cond_t;
typedef struct am_metadata {
am_file_data_t *metadata; /* Metadata file with one or many IdP */
am_file_data_t *chain; /* Validating chain */
} am_metadata_t;
typedef struct am_dir_cfg_rec {
/* enable_mellon is used to enable auth_mellon for a location.
*/
am_enable_t enable_mellon;
const char *varname;
int secure;
int http_only;
const char *merge_env_vars;
int env_vars_index_start;
int env_vars_count_in_n;
const char *cookie_domain;
const char *cookie_path;
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;
int dump_session;
int dump_saml_response;
/* The "root directory" of our SAML2 endpoints. This path is relative
* to the root of the web server.
*
* This path will always end with '/'.
*/
const char *endpoint_path;
/* Lasso configuration variables. */
am_file_data_t *sp_metadata_file;
am_file_data_t *sp_private_key_file;
am_file_data_t *sp_cert_file;
apr_array_header_t *idp_metadata;
am_file_data_t *idp_public_key_file;
am_file_data_t *idp_ca_file;
GList *idp_ignore;
/* metadata autogeneration helper */
char *sp_entity_id;
apr_hash_t *sp_org_name;
apr_hash_t *sp_org_display_name;
apr_hash_t *sp_org_url;
/* Maximum number of seconds a session is valid for. */
int session_length;
/* No cookie error page. */
const char *no_cookie_error_page;
/* Authorization error page. */
const char *no_success_error_page;
/* Login path for IdP initiated logins */
const char *login_path;
/* IdP discovery service */
const char *discovery_url;
int probe_discovery_timeout;
apr_table_t *probe_discovery_idp;
/* The configuration record we "inherit" the lasso server object from. */
struct am_dir_cfg_rec *inherit_server_from;
/* Mutex to prevent us from creating several lasso server objects. */
apr_thread_mutex_t *server_mutex;
/* AuthnContextClassRef list */
apr_array_header_t *authn_context_class_ref;
/* AuthnContextComparisonType */
const char *authn_context_comparison_type;
/* Controls the checking of SubjectConfirmationData.Address attribute */
int subject_confirmation_data_address_check;
/* MellonDoNotVerifyLogoutSignature idp set */
apr_hash_t *do_not_verify_logout_signature;
/* Controls whether the cache control header is set */
int send_cache_control_header;
/* Whether we should replay POST data after authentication. */
int post_replay;
/* Cached lasso server object. */
LassoServer *server;
/* Whether to send an ECP client a list of IdP's */
int ecp_send_idplist;
/* List of domains we can redirect to. */
const char * const *redirect_domains;
} am_dir_cfg_rec;
/* Bitmask for PAOS service options */
typedef enum {
ECP_SERVICE_OPTION_CHANNEL_BINDING = 1,
ECP_SERVICE_OPTION_HOLDER_OF_KEY = 2,
ECP_SERVICE_OPTION_WANT_AUTHN_SIGNED = 4,
ECP_SERVICE_OPTION_DELEGATION = 8,
} ECPServiceOptions;
typedef struct am_req_cfg_rec {
char *cookie_value;
#ifdef HAVE_ECP
bool ecp_authn_req;
ECPServiceOptions ecp_service_options;
#endif /* HAVE_ECP */
#ifdef ENABLE_DIAGNOSTICS
bool diag_emitted;
#endif
} am_req_cfg_rec;
typedef struct am_cache_storage_t {
apr_size_t ptr;
} am_cache_storage_t;
typedef struct am_cache_env_t {
am_cache_storage_t varname;
am_cache_storage_t value;
} am_cache_env_t;
typedef struct am_cache_entry_t {
char key[AM_CACHE_KEYSIZE];
am_cache_storage_t cookie_token;
apr_time_t access;
apr_time_t expires;
int logged_in;
unsigned short size;
am_cache_storage_t user;
/* Variables used to store lasso state between login requests
*and logout requests.
*/
am_cache_storage_t lasso_identity;
am_cache_storage_t lasso_session;
am_cache_storage_t lasso_saml_response;
am_cache_env_t env[AM_CACHE_ENVSIZE];
apr_size_t pool_size;
apr_size_t pool_used;
char pool[];
} am_cache_entry_t;
typedef enum {
AM_CACHE_SESSION,
AM_CACHE_NAMEID
} am_cache_key_t;
/* Type for configuring environment variable names */
typedef struct am_envattr_conf_t {
// Name of the variable
const char *name;
// Should a prefix be added
int prefixed;
} am_envattr_conf_t;
extern const command_rec auth_mellon_commands[];
typedef struct am_error_map_t {
int lasso_error;
int http_error;
} am_error_map_t;
extern const am_error_map_t auth_mellon_errormap[];
/* When using a value from a directory configuration structure, a special value is used
* to state "inherit" from parent, when reading a value and the value is still inherit from, it
* means that no value has ever been set for this directive, in this case, we use the default
* value.
*
* This macro expects that if your variable is called "name" there is a static const variable named
* "default_name" which holds the default value for this variable.
*/
#define CFG_VALUE(container, name) \
(container->name == inherit_##name ? default_##name : container->name)
#define CFG_MERGE(add_cfg, base_cfg, name) \
(add_cfg->name == inherit_##name ? base_cfg->name : add_cfg->name)
/** Default and inherit value for SubjectConfirmationData Address check setting.
*/
static const int default_subject_confirmation_data_address_check = 1;
static const int inherit_subject_confirmation_data_address_check = -1;
/** Default values for seting the cache-control header
*/
static const int default_send_cache_control_header = 1;
static const int inherit_send_cache_control_header = -1;
/* Default and inherit values for MellonPostReplay option. */
static const int default_post_replay = 0;
static const int inherit_post_replay = -1;
/* Whether to send an ECP client a list of IdP's */
static const int default_ecp_send_idplist = 0;
static const int inherit_ecp_send_idplist = -1;
/* Algorithm to use when signing Mellon SAML messages */
static const LassoSignatureMethod default_signature_method =
#if HAVE_DECL_LASSO_SIGNATURE_METHOD_RSA_SHA256
LASSO_SIGNATURE_METHOD_RSA_SHA256;
#else
LASSO_SIGNATURE_METHOD_RSA_SHA1;
#endif
static const int inherit_signature_method = -1;
void *auth_mellon_dir_config(apr_pool_t *p, char *d);
void *auth_mellon_dir_merge(apr_pool_t *p, void *base, void *add);
void *auth_mellon_server_config(apr_pool_t *p, server_rec *s);
void *auth_mellon_srv_merge(apr_pool_t *p, void *base, void *add);
const char *am_cookie_get(request_rec *r);
void am_cookie_set(request_rec *r, const char *id);
void am_cookie_delete(request_rec *r);
const char *am_cookie_token(request_rec *r);
void am_cache_init(am_mod_cfg_rec *mod_cfg);
am_cache_entry_t *am_cache_lock(request_rec *r,
am_cache_key_t type, const char *key);
const char *am_cache_entry_get_string(am_cache_entry_t *e,
am_cache_storage_t *slot);
am_cache_entry_t *am_cache_new(request_rec *r,
const char *key,
const char *cookie_token);
void am_cache_unlock(request_rec *r, am_cache_entry_t *entry);
void am_cache_update_expires(request_rec *r, am_cache_entry_t *t, apr_time_t expires);
void am_cache_env_populate(request_rec *r, am_cache_entry_t *session);
int am_cache_env_append(am_cache_entry_t *session,
const char *var, const char *val);
const char *am_cache_env_fetch_first(am_cache_entry_t *t,
const char *var);
void am_cache_delete(request_rec *r, am_cache_entry_t *session);
int am_cache_set_lasso_state(am_cache_entry_t *session,
const char *lasso_identity,
const char *lasso_session,
const char *lasso_saml_response);
const char *am_cache_get_lasso_identity(am_cache_entry_t *session);
const char *am_cache_get_lasso_session(am_cache_entry_t *session);
am_cache_entry_t *am_get_request_session(request_rec *r);
am_cache_entry_t *am_get_request_session_by_nameid(request_rec *r,
char *nameid);
am_cache_entry_t *am_new_request_session(request_rec *r);
void am_release_request_session(request_rec *r, am_cache_entry_t *session);
void am_delete_request_session(request_rec *r, am_cache_entry_t *session);
char *am_reconstruct_url(request_rec *r);
int am_validate_redirect_url(request_rec *r, const char *url);
int am_check_permissions(request_rec *r, am_cache_entry_t *session);
void am_set_cache_control_headers(request_rec *r);
int am_read_post_data(request_rec *r, char **data, apr_size_t *length);
char *am_extract_query_parameter(apr_pool_t *pool,
const char *query_string,
const char *name);
char *am_urlencode(apr_pool_t *pool, const char *str);
int am_urldecode(char *data);
int am_check_url(request_rec *r, const char *url);
char *am_generate_id(request_rec *r);
am_file_data_t *am_file_data_new(apr_pool_t *pool, const char *path);
am_file_data_t *am_file_data_copy(apr_pool_t *pool,
am_file_data_t *src_file_data);
apr_status_t am_file_read(am_file_data_t *file_data);
apr_status_t am_file_stat(am_file_data_t *file_data);
char *am_get_endpoint_url(request_rec *r);
int am_postdir_cleanup(request_rec *s);
char *am_htmlencode(request_rec *r, const char *str);
int am_save_post(request_rec *r, const char **relay_state);
const char *am_filepath_dirname(apr_pool_t *p, const char *path);
const char *am_strip_cr(request_rec *r, const char *str);
const char *am_add_cr(request_rec *r, const char *str);
const char *am_xstrtok(request_rec *r, const char *str,
const char *sep, char **last);
void am_strip_blank(const char **s);
const char *am_get_header_attr(request_rec *r, const char *h,
const char *v, const char *a);
int am_has_header(request_rec *r, const char *h, const char *v);
const char *am_get_mime_header(request_rec *r, const char *m, const char *h);
const char *am_get_mime_body(request_rec *r, const char *mime);
char *am_get_service_url(request_rec *r,
LassoProfile *profile, char *service_name);
bool am_parse_paos_header(request_rec *r, const char *header, ECPServiceOptions *options_return);
bool am_header_has_media_type(request_rec *r, const char *header,
const char *media_type);
const char *am_get_config_langstring(apr_hash_t *h, const char *lang);
int am_get_boolean_query_parameter(request_rec *r, const char *name,
int *return_value, int default_value);
char *am_get_assertion_consumer_service_by_binding(LassoProvider *provider, const char *binding);
#ifdef HAVE_ECP
char *am_ecp_service_options_str(apr_pool_t *pool, ECPServiceOptions options);
bool am_is_paos_request(request_rec *r, int *error_code);
#endif /* HAVE_ECP */
char *
am_saml_response_status_str(request_rec *r, LassoNode *node);
int am_auth_mellon_user(request_rec *r);
int am_check_uid(request_rec *r);
int am_handler(request_rec *r);
int am_httpclient_get(request_rec *r, const char *uri,
void **buffer, apr_size_t *size,
int timeout, long *status);
int am_httpclient_post(request_rec *r, const char *uri,
const void *post_data, apr_size_t post_length,
const char *content_type,
void **buffer, apr_size_t *size);
int am_httpclient_post_str(request_rec *r, const char *uri,
const char *post_data,
const char *content_type,
void **buffer, apr_size_t *size);
extern module AP_MODULE_DECLARE_DATA auth_mellon_module;
#ifdef ENABLE_DIAGNOSTICS
#if AP_SERVER_MAJORVERSION_NUMBER < 2 || \
(AP_SERVER_MAJORVERSION_NUMBER == 2 && AP_SERVER_MINORVERSION_NUMBER < 4)
#error "Diagnostics requires Apache version 2.4 or newer."
#endif
/* Initializing an apr_time_t to 0x7fffffffffffffffLL yields an
* iso 8601 time with 1 second precision of "294247-01-10T04:00:54Z"
* this is 22 characters, +1 for null terminator. */
#define ISO_8601_BUF_SIZE 23
typedef struct {
bool req_headers_written;
} am_diag_request_data;
const char *
am_diag_cache_key_type_str(am_cache_key_t key_type);
const char *
am_diag_cond_str(request_rec *r, const am_cond_t *cond);
int
am_diag_finalize_request(request_rec *r);
const char *
am_diag_lasso_http_method_str(LassoHttpMethod http_method);
void
am_diag_log_cache_entry(request_rec *r, int level, am_cache_entry_t *entry,
const char *fmt, ...)
__attribute__((format(printf,4,5)));
void
am_diag_log_file_data(request_rec *r, int level, am_file_data_t *file_data,
const char *fmt, ...)
__attribute__((format(printf,4,5)));
int
am_diag_log_init(apr_pool_t *pc, apr_pool_t *p, apr_pool_t *pt, server_rec *s);
void
am_diag_log_lasso_node(request_rec *r, int level, LassoNode *node,
const char *fmt, ...)
__attribute__((format(printf,4,5)));
void
am_diag_log_saml_status_response(request_rec *r, int level, LassoNode *node,
const char *fmt, ...)
__attribute__((format(printf,4,5)));
void
am_diag_log_profile(request_rec *r, int level, LassoProfile *profile,
const char *fmt, ...)
__attribute__((format(printf,4,5)));
void
am_diag_printf(request_rec *r, const char *fmt, ...)
__attribute__((format(printf,2,3)));
void
am_diag_rerror(const char *file, int line, int module_index,
int level, apr_status_t status,
request_rec *r, const char *fmt, ...);
char *
am_diag_time_t_to_8601(request_rec *r, apr_time_t t);
/* Define AM_LOG_RERROR log to both the Apache log and diagnostics log */
#define AM_LOG_RERROR(...) AM_LOG_RERROR__(__VA_ARGS__)
/* need additional step to expand macros */
#define AM_LOG_RERROR__(file, line, mi, level, status, r, ...) \
{ \
ap_log_rerror(file, line, mi, level, status, r, __VA_ARGS__); \
am_diag_rerror(file, line, mi, level, status, r, __VA_ARGS__); \
}
#else /* ENABLE_DIAGNOSTICS */
#define am_diag_log_cache_entry(...) do {} while(0)
#define am_diag_log_file_data(...) do {} while(0)
#define am_diag_log_lasso_node(...) do {} while(0)
#define am_diag_log_saml_status_response(...) do {} while(0)
#define am_diag_log_profile(...) do {} while(0)
#define am_diag_printf(...) do {} while(0)
/* Define AM_LOG_RERROR log only to the Apache log */
#define AM_LOG_RERROR(...) ap_log_rerror(__VA_ARGS__)
#endif /* ENABLE_DIAGNOSTICS */
#endif /* MOD_AUTH_MELLON_H */
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