#ifndef HEADER_CURL_VAUTH_H

#define HEADER_CURL_VAUTH_H

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

 *                                  _   _ ____  _

 *  Project                     ___| | | |  _ \| |

 *                             / __| | | | |_) | |

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) Steve Holme, <steve_holme@hotmail.com>.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms

 * are also available at https://curl.se/docs/copyright.html.

 *

 * You may opt to use, copy, modify, merge, publish, distribute and/or sell

 * copies of the Software, and permit persons to whom the Software is

 * furnished to do so, under the terms of the COPYING file.

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

 * KIND, either express or implied.

 *

 * SPDX-License-Identifier: curl

 *

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

#include <curl/curl.h>

#include "../bufref.h"

#include "../curlx/dynbuf.h"

#include "../urldata.h"

struct Curl_easy;

struct connectdata;

#ifndef CURL_DISABLE_DIGEST_AUTH

struct digestdata;

#endif

#ifdef USE_NTLM

struct ntlmdata;

#endif

#if (defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)) && defined(USE_SPNEGO)

struct negotiatedata;

#endif

#ifdef USE_GSASL

struct gsasldata;

#endif

#ifdef USE_WINDOWS_SSPI

#include "../curl_sspi.h"

#define GSS_ERROR(status) ((status) & 0x80000000)

#endif

/*

 * Curl_auth_allowed_to_host() tells if authentication, cookies or other

 * "sensitive data" can (still) be sent to this host.

 */

bool Curl_auth_allowed_to_host(struct Curl_easy *data);

/* This is used to build an SPN string */

#ifndef USE_WINDOWS_SSPI

char *Curl_auth_build_spn(const char *service, const char *host,

                          const char *realm);

#else

TCHAR *Curl_auth_build_spn(const char *service, const char *host,

                           const char *realm);

#endif

/* This is used to test if the user contains a Windows domain name */

bool Curl_auth_user_contains_domain(const char *user);

/* This is used to generate a PLAIN cleartext message */

CURLcode Curl_auth_create_plain_message(const char *authzid,

                                        const char *authcid,

                                        const char *passwd,

                                        struct bufref *out);

/* This is used to generate a LOGIN cleartext message */

void Curl_auth_create_login_message(const char *value, struct bufref *out);

/* This is used to generate an EXTERNAL cleartext message */

void Curl_auth_create_external_message(const char *user, struct bufref *out);

#ifndef CURL_DISABLE_DIGEST_AUTH

/* This is used to generate a CRAM-MD5 response message */

CURLcode Curl_auth_create_cram_md5_message(const struct bufref *chlg,

                                           const char *userp,

                                           const char *passwdp,

                                           struct bufref *out);

/* This is used to evaluate if DIGEST is supported */

bool Curl_auth_is_digest_supported(void);

/* This is used to generate a base64 encoded DIGEST-MD5 response message */

CURLcode Curl_auth_create_digest_md5_message(struct Curl_easy *data,

                                             const struct bufref *chlg,

                                             const char *userp,

                                             const char *passwdp,

                                             const char *service,

                                             struct bufref *out);

/* This is used to decode an HTTP DIGEST challenge message */

CURLcode Curl_auth_decode_digest_http_message(const char *chlg,

                                              struct digestdata *digest);

/* This is used to generate an HTTP DIGEST response message */

CURLcode Curl_auth_create_digest_http_message(struct Curl_easy *data,

                                              const char *userp,

                                              const char *passwdp,

                                              const unsigned char *request,

                                              const unsigned char *uri,

                                              struct digestdata *digest,

                                              char **outptr, size_t *outlen);

/* This is used to clean up the digest specific data */

void Curl_auth_digest_cleanup(struct digestdata *digest);

#else

#define Curl_auth_is_digest_supported()       FALSE

#endif /* !CURL_DISABLE_DIGEST_AUTH */

#ifdef USE_GSASL

/* meta key for storing GSASL meta at connection */

#define CURL_META_GSASL_CONN   "meta:auth:gsasl:conn"

#include <gsasl.h>

struct gsasldata {

  Gsasl *ctx;

  Gsasl_session *client;

};

struct gsasldata *Curl_auth_gsasl_get(struct connectdata *conn);

/* This is used to evaluate if MECH is supported by gsasl */

bool Curl_auth_gsasl_is_supported(struct Curl_easy *data,

                                  const char *mech,

                                  struct gsasldata *gsasl);

/* This is used to start a gsasl method */

CURLcode Curl_auth_gsasl_start(struct Curl_easy *data,

                               const char *userp,

                               const char *passwdp,

                               struct gsasldata *gsasl);

/* This is used to process and generate a new SASL token */

CURLcode Curl_auth_gsasl_token(struct Curl_easy *data,

                               const struct bufref *chlg,

                               struct gsasldata *gsasl,

                               struct bufref *out);

/* This is used to clean up the gsasl specific data */

void Curl_auth_gsasl_cleanup(struct gsasldata *digest);

#endif

#ifdef USE_NTLM

/* meta key for storing NTML meta at connection */

#define CURL_META_NTLM_CONN   "meta:auth:ntml:conn"

/* meta key for storing NTML-PROXY meta at connection */

#define CURL_META_NTLM_PROXY_CONN   "meta:auth:ntml-proxy:conn"

struct ntlmdata {

#ifdef USE_WINDOWS_SSPI

/* The sslContext is used for the Schannel bindings. The

 * api is available on the Windows 7 SDK and later.

 */

#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS

  CtxtHandle *sslContext;

#endif

  CredHandle *credentials;

  CtxtHandle *context;

  SEC_WINNT_AUTH_IDENTITY identity;

  SEC_WINNT_AUTH_IDENTITY *p_identity;

  size_t token_max;

  BYTE *output_token;

  BYTE *input_token;

  size_t input_token_len;

  TCHAR *spn;

#else

  unsigned int flags;

  unsigned char nonce[8];

  unsigned int target_info_len;

  void *target_info; /* TargetInfo received in the NTLM type-2 message */

#endif

};

/* This is used to evaluate if NTLM is supported */

bool Curl_auth_is_ntlm_supported(void);

struct ntlmdata *Curl_auth_ntlm_get(struct connectdata *conn, bool proxy);

void Curl_auth_ntlm_remove(struct connectdata *conn, bool proxy);

/* This is used to clean up the NTLM specific data */

void Curl_auth_cleanup_ntlm(struct ntlmdata *ntlm);

/* This is used to generate a base64 encoded NTLM type-1 message */

CURLcode Curl_auth_create_ntlm_type1_message(struct Curl_easy *data,

                                             const char *userp,

                                             const char *passwdp,

                                             const char *service,

                                             const char *host,

                                             struct ntlmdata *ntlm,

                                             struct bufref *out);

/* This is used to decode a base64 encoded NTLM type-2 message */

CURLcode Curl_auth_decode_ntlm_type2_message(struct Curl_easy *data,

                                             const struct bufref *type2,

                                             struct ntlmdata *ntlm);

/* This is used to generate a base64 encoded NTLM type-3 message */

CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data,

                                             const char *userp,

                                             const char *passwdp,

                                             struct ntlmdata *ntlm,

                                             struct bufref *out);

#else

#define Curl_auth_is_ntlm_supported()     FALSE

#endif /* USE_NTLM */

/* This is used to generate a base64 encoded OAuth 2.0 message */

CURLcode Curl_auth_create_oauth_bearer_message(const char *user,

                                               const char *host,

                                               const long port,

                                               const char *bearer,

                                               struct bufref *out);

/* This is used to generate a base64 encoded XOAuth 2.0 message */

CURLcode Curl_auth_create_xoauth_bearer_message(const char *user,

                                                const char *bearer,

                                                struct bufref *out);

#ifdef USE_KERBEROS5

/* meta key for storing KRB5 meta at connection */

#define CURL_META_KRB5_CONN   "meta:auth:krb5:conn"

struct kerberos5data {

#ifdef USE_WINDOWS_SSPI

  CredHandle *credentials;

  CtxtHandle *context;

  TCHAR *spn;

  SEC_WINNT_AUTH_IDENTITY identity;

  SEC_WINNT_AUTH_IDENTITY *p_identity;

  size_t token_max;

  BYTE *output_token;

#else

  gss_ctx_id_t context;

  gss_name_t spn;

#endif

};

struct kerberos5data *Curl_auth_krb5_get(struct connectdata *conn);

/* This is used to evaluate if GSSAPI (Kerberos V5) is supported */

bool Curl_auth_is_gssapi_supported(void);

/* This is used to generate a base64 encoded GSSAPI (Kerberos V5) user token

   message */

CURLcode Curl_auth_create_gssapi_user_message(struct Curl_easy *data,

                                              const char *userp,

                                              const char *passwdp,

                                              const char *service,

                                              const char *host,

                                              const bool mutual,

                                              const struct bufref *chlg,

                                              struct kerberos5data *krb5,

                                              struct bufref *out);

/* This is used to generate a base64 encoded GSSAPI (Kerberos V5) security

   token message */

CURLcode Curl_auth_create_gssapi_security_message(struct Curl_easy *data,

                                                  const char *authzid,

                                                  const struct bufref *chlg,

                                                  struct kerberos5data *krb5,

                                                  struct bufref *out);

/* This is used to clean up the GSSAPI specific data */

void Curl_auth_cleanup_gssapi(struct kerberos5data *krb5);

#else

#define Curl_auth_is_gssapi_supported()       FALSE

#endif /* USE_KERBEROS5 */

#ifdef USE_SPNEGO

bool Curl_auth_is_spnego_supported(void);

/* meta key for storing NEGO meta at connection */

#define CURL_META_NEGO_CONN         "meta:auth:nego:conn"

/* meta key for storing NEGO PROXY meta at connection */

#define CURL_META_NEGO_PROXY_CONN   "meta:auth:nego-proxy:conn"

/* Struct used for Negotiate (SPNEGO) authentication */

struct negotiatedata {

#ifdef HAVE_GSSAPI

  OM_uint32 status;

  gss_ctx_id_t context;

  gss_name_t spn;

  gss_buffer_desc output_token;

#ifdef GSS_C_CHANNEL_BOUND_FLAG

  struct dynbuf channel_binding_data;

#endif

#else

#ifdef USE_WINDOWS_SSPI

#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS

  CtxtHandle *sslContext;

#endif

  SECURITY_STATUS status;

  CredHandle *credentials;

  CtxtHandle *context;

  SEC_WINNT_AUTH_IDENTITY identity;

  SEC_WINNT_AUTH_IDENTITY *p_identity;

  TCHAR *spn;

  size_t token_max;

  BYTE *output_token;

  size_t output_token_length;

#endif

#endif

  BIT(noauthpersist);

  BIT(havenoauthpersist);

  BIT(havenegdata);

  BIT(havemultiplerequests);

};

struct negotiatedata *

Curl_auth_nego_get(struct connectdata *conn, bool proxy);

/* This is used to decode a base64 encoded SPNEGO (Negotiate) challenge

   message */

CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,

                                         const char *user,

                                         const char *password,

                                         const char *service,

                                         const char *host,

                                         const char *chlg64,

                                         struct negotiatedata *nego);

/* This is used to generate a base64 encoded SPNEGO (Negotiate) response

   message */

CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,

                                         char **outptr, size_t *outlen);

/* This is used to clean up the SPNEGO specific data */

void Curl_auth_cleanup_spnego(struct negotiatedata *nego);

#endif /* USE_SPNEGO */

#endif /* HEADER_CURL_VAUTH_H */