* Author: David Woodhouse <dwmw2@infradead.org>

*

* This program is free software; you can redistribute it and/or

* WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public

* License along with this library; if not, write to:

*

* Free Software Foundation, Inc.

* 51 Franklin Street, Fifth Floor,

* Boston, MA 02110-1301 USA

*/

#ifndef __OPENCONNECT_H__

#define __OPENCONNECT_H__

#include <sys/types.h>

#include <unistd.h>

/*

* - Add openconnect_set_stoken_mode(), openconnect_has_stoken_support()

*

* API version 2.0:

* - OPENCONNECT_X509 is now an opaque type.

* - Rename openconnect_vpninfo_new_with_cbdata() -> openconnect_vpninfo_new()

* and kill the old openconnect_vpninfo_new() and its callback types.

* API version 1.5:

* - Add openconnect_get_cert_details(), openconnect_get_cert_DER().

*

* API version 1.4:

* - Add openconnect_set_cancel_fd()

*

* API version 1.3:

* - Add openconnect_set_cert_expiry_warning() to change from default 60 days

*

* API version 1.2:

* - Add openconnect_vpninfo_new_with_cbdata()

*

* API version 1.1:

* - Add openconnect_vpninfo_free()

*

* API version 1.0:

* - Initial version

*/

/* Before API version 1.4 (OpenConnect 3.19) this macro didn't exist.

* Somewhat ironic, that the API version check itself needs to be

* conditionally used depending on the API version. A very simple way

* for users to handle this with an approximately correct answer is

* #include <openconnect.h>

* #ifndef OPENCONNECT_CHECK_VER

* #define OPENCONNECT_CHECK_VER(x,y) 0

* #endif

*/

#define OPENCONNECT_CHECK_VER(maj,min) \

(OPENCONNECT_API_VERSION_MAJOR > (maj) || \

(OPENCONNECT_API_VERSION_MAJOR == (maj) && \

OPENCONNECT_API_VERSION_MINOR >= (min)))

/****************************************************************************/

/* Authentication form processing */

#define OC_FORM_OPT_TEXT 1

#define OC_FORM_OPT_PASSWORD 2

#define OC_FORM_OPT_SELECT 3

#define OC_FORM_OPT_HIDDEN 4

/* char * fields are static (owned by XML parser) and don't need to be

freed by the form handling code -- except for value, which for TEXT

and PASSWORD options is allocated by process_form() when

interacting with the user and must be freed. */

struct oc_form_opt {

struct oc_form_opt *next;

int type;

char *name;

char *label;

char *value;

};

/* All fields are static, owned by the XML parser */

struct oc_choice {

char *name;

char *label;

char *auth_type;

char *override_name;

char *override_label;

};

struct oc_form_opt_select {

struct oc_form_opt form;

int nr_choices;

struct oc_choice choices[0];

};

/* All char * fields are static, owned by the XML parser */

struct oc_auth_form {

char *banner;

char *message;

char *error;

char *auth_id;

char *method;

char *action;

struct oc_form_opt *opts;

};

/****************************************************************************/

#define PRG_ERR 0

#define PRG_INFO 1

#define PRG_DEBUG 2

#define PRG_TRACE 3

/* Unless otherwise specified, all functions which set strings will take

ownership of those strings and the library will free them later in

openconnect_vpninfo_free() */

/* The buffer 'buf' must be at least 41 bytes. It will receive a hex string

with trailing NUL, representing the SHA1 fingerprint of the certificate. */

/* Returns the length of the created DER output, in a newly-allocated buffer

that will need to be freed by the caller. */

int openconnect_get_cert_DER(struct openconnect_info *vpninfo,

char *openconnect_get_vpn_name (struct openconnect_info *);

char *openconnect_get_hostname (struct openconnect_info *);

void openconnect_set_hostname (struct openconnect_info *, char *);

char *openconnect_get_urlpath (struct openconnect_info *);

void openconnect_set_urlpath (struct openconnect_info *, char *);

/* This function does *not* take ownership of the string; it is parsed

and then discarded. */

int openconnect_set_stoken_mode (struct openconnect_info *,

int use_stoken, const char *token_str);

into a static buffer in the vpninfo. The size must be 41 bytes,

since that's the size of a 20-byte SHA1 represented as hex with

a trailing NUL. */

void openconnect_set_cafile (struct openconnect_info *, char *);

void openconnect_setup_csd (struct openconnect_info *, uid_t, int silent, char *wrapper);

/* This is *not* yours and must not be destroyed with X509_free(). It

* will be valid when a cookie has been obtained successfully, and will

* be valid until the connection is destroyed or another attempt it made

* to use it. */

int openconnect_get_port (struct openconnect_info *);

char *openconnect_get_cookie (struct openconnect_info *);

void openconnect_clear_cookie (struct openconnect_info *);

void openconnect_reset_ssl (struct openconnect_info *vpninfo);

int openconnect_parse_url (struct openconnect_info *vpninfo, char *url);

void openconnect_set_cert_expiry_warning (struct openconnect_info *vpninfo,

int seconds);

/* If this is set, then openconnect_obtain_cookie() will abort and return

failure if the file descriptor is readable. Typically a user may create

a pair of pipes with the pipe(2) system call, hand the readable one to

this function, and then write a byte to the other end if it ever wants

to cancel the connection. This way, a multi-threaded UI (which will be

running openconnect_obtain_cookie() in a separate thread since it blocks)

has the ability to cancel that call, reap its thread and free the

vpninfo structure (or retry). An 'fd' argument of -1 will render the

cancellation mechanism inactive. */

void openconnect_set_cancel_fd (struct openconnect_info *vpninfo, int fd);

the privdata argument provided to openconnect_vpninfo_new_with_cbdata(),

or if that argument was NULL then it'll be the vpninfo itself. */

/* When the server's certificate fails validation via the normal means,

this function is called with the offending certificate along with

a textual reason for the failure (which may not be translated, if

it comes directly from OpenSSL, but will be if it is rejected for

"certificate does not match hostname", because that check is done

in OpenConnect and *is* translated). The function shall return zero

if the certificate is (or has in the past been) explicitly accepted

by the user, and non-zero to abort the connection. */

OPENCONNECT_X509 *cert,

const char *reason);

/* On a successful connection, the server may provide us with a new XML

configuration file. This contains the list of servers that can be

chosen by the user to connect to, amongst other stuff that we mostly

ignore. By "new", we mean that the SHA1 indicated by the server does

not match the SHA1 set with the openconnect_set_xmlsha1() above. If

they don't match, or openconnect_set_xmlsha1() has not been called,

then the new XML is downloaded and this function is invoked. */

typedef int (*openconnect_write_new_config_vfn) (void *privdata, char *buf,

int buflen);

/* Handle an authentication form, requesting input from the user.

* Return value:

* < 0, on error

* = 0, when form was parsed and POST required

* = 1, when response was cancelled by user

*/

typedef int (*openconnect_process_auth_form_vfn) (void *privdata,

struct oc_auth_form *form);

typedef void __attribute__ ((format(printf, 3, 4)))

(*openconnect_progress_vfn) (void *privdata, int level,

const char *fmt, ...);

openconnect_validate_peer_cert_vfn,

openconnect_write_new_config_vfn,

openconnect_process_auth_form_vfn,

openconnect_progress_vfn,

void *privdata);

void openconnect_vpninfo_free (struct openconnect_info *vpninfo);

/* SSL certificate capabilities. openconnect_has_pkcs11_support() means that we

can accept PKCS#11 URLs in place of filenames, for the certificate and key. */

int openconnect_has_pkcs11_support(void);

/* The OpenSSL TPM ENGINE stores keys in a PEM file labelled with the string

-----BEGIN TSS KEY BLOB-----. GnuTLS may learn to support this format too,

in the near future. */

int openconnect_has_tss_blob_support(void);

/* Software token capabilities. */

int openconnect_has_stoken_support(void);