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Add client certificate authentication and optional SASL EXTERNAL bind,
which allows the client to bind as the subject of the certificate in cases
where the directory doesn't implicitly do that.

The client certificate is configured with 'certfile' and 'keyfile'
directives, and SASL EXTERNAL bind is configured with the 'bindext'
directive.

ok tb@

/*	$OpenBSD: aldap.h,v 1.15 2022/10/13 04:55:33 jmatthew Exp $ */

/*
 * Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org>
 * Copyright (c) 2006, 2007 Marc Balmer <mbalmer@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdio.h>

#include <ber.h>
#include <tls.h>

#define LDAP_URL 		"ldap://"
#define LDAPS_URL 		"ldaps://"
#define LDAPTLS_URL 		"ldap+tls://"
#define LDAPI_URL 		"ldapi://"

#define LDAP_PORT 		389
#define LDAPS_PORT 		636
#define LDAP_PAGED_OID		"1.2.840.113556.1.4.319"
#define LDAP_STARTTLS_OID	"1.3.6.1.4.1.1466.20037"

#define LDAP_SASL_MECH_EXTERNAL	"EXTERNAL"

struct aldap {
#define ALDAP_ERR_SUCCESS		0
#define ALDAP_ERR_PARSER_ERROR		1
#define ALDAP_ERR_INVALID_FILTER	2
#define ALDAP_ERR_OPERATION_FAILED	3
#define ALDAP_ERR_TLS_ERROR		4
	u_int8_t	err;
	int		msgid;
	struct ber	ber;

	int		fd;
	struct tls	*tls;

	struct evbuffer *buf;
};

struct aldap_page_control {
	int size;
	char *cookie;
	unsigned int cookie_len;
};

struct aldap_message {
	int msgid;
	int message_type;

	struct ber_element	*msg;

	struct ber_element	*header;
	struct ber_element	*protocol_op;

	struct ber_element	*dn;

	union {
		struct {
			long long		 rescode;
			struct ber_element	*diagmsg;
		}			 res;
		struct {
			struct ber_element	*iter;
			struct ber_element	*attrs;
		}			 search;
	} body;
	struct ber_element	*references;
	struct aldap_page_control *page; 
};

enum aldap_protocol {
	LDAP,
	LDAPS,
	LDAPTLS,
	LDAPI
};

struct aldap_stringset {
	size_t			 len;
	struct ber_octetstring	*str;
};

struct aldap_url {
	int		 protocol;
	char		*host;
	in_port_t	 port;
	char		*dn;
#define MAXATTR 1024
	char		*attributes[MAXATTR];
	int		 scope;
	char		*filter;
	char		*buffer;
};

enum protocol_op {
	LDAP_REQ_BIND		= 0,
	LDAP_RES_BIND		= 1,
	LDAP_REQ_UNBIND_30	= 2,
	LDAP_REQ_SEARCH		= 3,
	LDAP_RES_SEARCH_ENTRY	= 4,
	LDAP_RES_SEARCH_RESULT	= 5,
	LDAP_REQ_MODIFY		= 6,
	LDAP_RES_MODIFY		= 7,
	LDAP_REQ_ADD		= 8,
	LDAP_RES_ADD		= 9,
	LDAP_REQ_DELETE_30	= 10,
	LDAP_RES_DELETE		= 11,
	LDAP_REQ_MODRDN		= 12,
	LDAP_RES_MODRDN		= 13,
	LDAP_REQ_COMPARE	= 14,
	LDAP_RES_COMPARE	= 15,
	LDAP_REQ_ABANDON_30	= 16,

	LDAP_RES_SEARCH_REFERENCE = 19,

	LDAP_REQ_EXTENDED	= 23,
	LDAP_RES_EXTENDED	= 24
};

enum deref_aliases {
	LDAP_DEREF_NEVER	= 0,
	LDAP_DEREF_SEARCHING	= 1,
	LDAP_DEREF_FINDING	= 2,
	LDAP_DEREF_ALWAYS	= 3,
};

enum authentication_choice {
	LDAP_AUTH_SIMPLE	= 0,
	LDAP_AUTH_SASL		= 3,
};

enum scope {
	LDAP_SCOPE_BASE		= 0,
	LDAP_SCOPE_ONELEVEL	= 1,
	LDAP_SCOPE_SUBTREE	= 2,
};

enum result_code {
	LDAP_SUCCESS				= 0,
	LDAP_OPERATIONS_ERROR			= 1,
	LDAP_PROTOCOL_ERROR			= 2,
	LDAP_TIMELIMIT_EXCEEDED			= 3,
	LDAP_SIZELIMIT_EXCEEDED			= 4,
	LDAP_COMPARE_FALSE			= 5,
	LDAP_COMPARE_TRUE			= 6,
	LDAP_STRONG_AUTH_NOT_SUPPORTED		= 7,
	LDAP_STRONG_AUTH_REQUIRED		= 8,

	LDAP_REFERRAL				= 10,
	LDAP_ADMINLIMIT_EXCEEDED		= 11,
	LDAP_UNAVAILABLE_CRITICAL_EXTENSION	= 12,
	LDAP_CONFIDENTIALITY_REQUIRED		= 13,
	LDAP_SASL_BIND_IN_PROGRESS		= 14,
	LDAP_NO_SUCH_ATTRIBUTE			= 16,
	LDAP_UNDEFINED_TYPE			= 17,
	LDAP_INAPPROPRIATE_MATCHING		= 18,
	LDAP_CONSTRAINT_VIOLATION		= 19,
	LDAP_TYPE_OR_VALUE_EXISTS		= 20,
	LDAP_INVALID_SYNTAX			= 21,

	LDAP_NO_SUCH_OBJECT			= 32,
	LDAP_ALIAS_PROBLEM			= 33,
	LDAP_INVALID_DN_SYNTAX			= 34,

	LDAP_ALIAS_DEREF_PROBLEM		= 36,

	LDAP_INAPPROPRIATE_AUTH			= 48,
	LDAP_INVALID_CREDENTIALS		= 49,
	LDAP_INSUFFICIENT_ACCESS		= 50,
	LDAP_BUSY				= 51,
	LDAP_UNAVAILABLE			= 52,
	LDAP_UNWILLING_TO_PERFORM		= 53,
	LDAP_LOOP_DETECT			= 54,

	LDAP_NAMING_VIOLATION			= 64,
	LDAP_OBJECT_CLASS_VIOLATION		= 65,
	LDAP_NOT_ALLOWED_ON_NONLEAF		= 66,
	LDAP_NOT_ALLOWED_ON_RDN			= 67,
	LDAP_ALREADY_EXISTS			= 68,
	LDAP_NO_OBJECT_CLASS_MODS		= 69,

	LDAP_AFFECTS_MULTIPLE_DSAS		= 71,

	LDAP_OTHER				= 80,
};

enum filter {
	LDAP_FILT_AND		= 0,
	LDAP_FILT_OR		= 1,
	LDAP_FILT_NOT		= 2,
	LDAP_FILT_EQ		= 3,
	LDAP_FILT_SUBS		= 4,
	LDAP_FILT_GE		= 5,
	LDAP_FILT_LE		= 6,
	LDAP_FILT_PRES		= 7,
	LDAP_FILT_APPR		= 8,
};

enum subfilter {
	LDAP_FILT_SUBS_INIT	= 0,
	LDAP_FILT_SUBS_ANY	= 1,
	LDAP_FILT_SUBS_FIN	= 2,
};

struct aldap		*aldap_init(int);
int			 aldap_tls(struct aldap *, struct tls_config *,
			    const char *);
int			 aldap_close(struct aldap *);
struct aldap_message	*aldap_parse(struct aldap *);
void			 aldap_freemsg(struct aldap_message *);

int	 		 aldap_req_starttls(struct aldap *);

int	 aldap_bind(struct aldap *, char *, char *);
int	 aldap_bind_sasl_external(struct aldap *, char *);
int	 aldap_unbind(struct aldap *);
int	 aldap_search(struct aldap *, char *, enum scope, char *, char **, int, int, int, struct aldap_page_control *);
int	 aldap_get_errno(struct aldap *, const char **);

int	 aldap_get_resultcode(struct aldap_message *);
char	*aldap_get_dn(struct aldap_message *);
char	*aldap_get_diagmsg(struct aldap_message *);
struct aldap_stringset	*aldap_get_references(struct aldap_message *);
void	 aldap_free_references(char **values);
int	 aldap_parse_url(const char *, struct aldap_url *);
void	 aldap_free_url(struct aldap_url *);
int	 aldap_search_url(struct aldap *, char *, int, int, int,
	    struct aldap_page_control *);

int	 aldap_count_attrs(struct aldap_message *);
int	 aldap_match_attr(struct aldap_message *, char *,
	    struct aldap_stringset **);
int	 aldap_first_attr(struct aldap_message *, char **, struct
	    aldap_stringset **);
int	 aldap_next_attr(struct aldap_message *, char **,
	    struct aldap_stringset **);
int	 aldap_free_attr(struct aldap_stringset *);

struct aldap_page_control *aldap_parse_page_control(struct ber_element *, size_t len);
void	 aldap_freepage(struct aldap_page_control *);