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curl/lib/curl_sasl.h

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#ifndef HEADER_CURL_SASL_H
#define HEADER_CURL_SASL_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* 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 http://curl.haxx.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.
*
***************************************************************************/
#include <curl/curl.h>
struct SessionHandle;
struct connectdata;
#if !defined(CURL_DISABLE_CRYPTO_AUTH)
struct digestdata;
#endif
#if defined(USE_NTLM)
struct ntlmdata;
#endif
#if defined(USE_KERBEROS5)
struct kerberos5data;
#endif
/* Authentication mechanism flags */
#define SASL_MECH_LOGIN (1 << 0)
#define SASL_MECH_PLAIN (1 << 1)
#define SASL_MECH_CRAM_MD5 (1 << 2)
#define SASL_MECH_DIGEST_MD5 (1 << 3)
#define SASL_MECH_GSSAPI (1 << 4)
#define SASL_MECH_EXTERNAL (1 << 5)
#define SASL_MECH_NTLM (1 << 6)
#define SASL_MECH_XOAUTH2 (1 << 7)
/* Authentication mechanism values */
#define SASL_AUTH_NONE 0
#define SASL_AUTH_ANY ~0U
#define SASL_AUTH_DEFAULT (SASL_AUTH_ANY & \
~(SASL_MECH_EXTERNAL | SASL_MECH_XOAUTH2))
/* Authentication mechanism strings */
#define SASL_MECH_STRING_LOGIN "LOGIN"
#define SASL_MECH_STRING_PLAIN "PLAIN"
#define SASL_MECH_STRING_CRAM_MD5 "CRAM-MD5"
#define SASL_MECH_STRING_DIGEST_MD5 "DIGEST-MD5"
#define SASL_MECH_STRING_GSSAPI "GSSAPI"
#define SASL_MECH_STRING_EXTERNAL "EXTERNAL"
#define SASL_MECH_STRING_NTLM "NTLM"
#define SASL_MECH_STRING_XOAUTH2 "XOAUTH2"
enum {
CURLDIGESTALGO_MD5,
CURLDIGESTALGO_MD5SESS
};
/* SASL machine states */
typedef enum {
SASL_STOP,
SASL_PLAIN,
SASL_LOGIN,
SASL_LOGIN_PASSWD,
SASL_EXTERNAL,
SASL_CRAMMD5,
SASL_DIGESTMD5,
SASL_DIGESTMD5_RESP,
SASL_NTLM,
SASL_NTLM_TYPE2MSG,
SASL_GSSAPI,
SASL_GSSAPI_TOKEN,
SASL_GSSAPI_NO_DATA,
SASL_XOAUTH2,
SASL_CANCEL,
SASL_FINAL
} saslstate;
/* Progress indicator */
typedef enum {
SASL_IDLE,
SASL_INPROGRESS,
SASL_DONE
} saslprogress;
/* Protocol dependent SASL parameters */
struct SASLproto {
const char *service; /* The service name */
int contcode; /* Code to receive when continuation is expected */
int finalcode; /* Code to receive upon authentication success */
size_t maxirlen; /* Maximum initial response length */
CURLcode (*sendauth)(struct connectdata *conn,
const char *mech, const char *ir);
/* Send authentication command */
CURLcode (*sendcont)(struct connectdata *conn, const char *contauth);
/* Send authentication continuation */
void (*getmessage)(char *buffer, char **outptr);
/* Get SASL response message */
};
/* Per-connection parameters */
struct SASL {
const struct SASLproto *params; /* Protocol dependent parameters */
saslstate state; /* Current machine state */
unsigned int authmechs; /* Accepted authentication mechanisms */
unsigned int prefmech; /* Preferred authentication mechanism */
unsigned int authused; /* Auth mechanism used for the connection */
bool resetprefs; /* For URL auth option parsing. */
bool mutual_auth; /* Mutual authentication enabled (GSSAPI only) */
bool force_ir; /* Protocol always supports initial response */
};
/* This is used to test whether the line starts with the given mechanism */
#define sasl_mech_equal(line, wordlen, mech) \
(wordlen == (sizeof(mech) - 1) / sizeof(char) && \
!memcmp(line, mech, wordlen))
/* This is used to build a SPN string */
#if !defined(USE_WINDOWS_SSPI)
char *Curl_sasl_build_spn(const char *service, const char *instance);
#else
TCHAR *Curl_sasl_build_spn(const char *service, const char *instance);
#endif
#if defined(HAVE_GSSAPI)
char *Curl_sasl_build_gssapi_spn(const char *service, const char *host);
#endif
#ifndef CURL_DISABLE_CRYPTO_AUTH
/* This is used to generate a base64 encoded DIGEST-MD5 response message */
CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
const char *chlg64,
const char *userp,
const char *passwdp,
const char *service,
char **outptr, size_t *outlen);
/* This is used to decode a HTTP DIGEST challenge message */
CURLcode Curl_sasl_decode_digest_http_message(const char *chlg,
struct digestdata *digest);
/* This is used to generate a HTTP DIGEST response message */
CURLcode Curl_sasl_create_digest_http_message(struct SessionHandle *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_sasl_digest_cleanup(struct digestdata *digest);
#endif
#ifdef USE_NTLM
/* This is used to generate a base64 encoded NTLM type-1 message */
CURLcode Curl_sasl_create_ntlm_type1_message(const char *userp,
const char *passwdp,
struct ntlmdata *ntlm,
char **outptr,
size_t *outlen);
/* This is used to decode a base64 encoded NTLM type-2 message */
CURLcode Curl_sasl_decode_ntlm_type2_message(struct SessionHandle *data,
const char *type2msg,
struct ntlmdata *ntlm);
/* This is used to generate a base64 encoded NTLM type-3 message */
CURLcode Curl_sasl_create_ntlm_type3_message(struct SessionHandle *data,
const char *userp,
const char *passwdp,
struct ntlmdata *ntlm,
char **outptr, size_t *outlen);
/* This is used to clean up the ntlm specific data */
void Curl_sasl_ntlm_cleanup(struct ntlmdata *ntlm);
#endif /* USE_NTLM */
#if defined(USE_KERBEROS5)
/* This is used to generate a base64 encoded GSSAPI (Kerberos V5) user token
message */
CURLcode Curl_sasl_create_gssapi_user_message(struct SessionHandle *data,
const char *userp,
const char *passwdp,
const char *service,
const bool mutual,
const char *chlg64,
struct kerberos5data *krb5,
char **outptr, size_t *outlen);
/* This is used to generate a base64 encoded GSSAPI (Kerberos V5) security
token message */
CURLcode Curl_sasl_create_gssapi_security_message(struct SessionHandle *data,
const char *input,
struct kerberos5data *krb5,
char **outptr,
size_t *outlen);
/* This is used to clean up the gssapi specific data */
void Curl_sasl_gssapi_cleanup(struct kerberos5data *krb5);
#endif /* USE_KERBEROS5 */
/* This is used to cleanup any libraries or curl modules used by the sasl
functions */
void Curl_sasl_cleanup(struct connectdata *conn, unsigned int authused);
/* Convert a mechanism name to a token */
unsigned int Curl_sasl_decode_mech(const char *ptr,
size_t maxlen, size_t *len);
/* Parse the URL login options */
CURLcode Curl_sasl_parse_url_auth_option(struct SASL *sasl,
const char *value, size_t len);
/* Initializes an SASL structure */
void Curl_sasl_init(struct SASL *sasl, const struct SASLproto *params);
/* Check if we have enough auth data and capabilities to authenticate */
bool Curl_sasl_can_authenticate(struct SASL *sasl, struct connectdata *conn);
/* Calculate the required login details for SASL authentication */
CURLcode Curl_sasl_start(struct SASL *sasl, struct connectdata *conn,
bool force_ir, saslprogress *progress);
/* Continue an SASL authentication */
CURLcode Curl_sasl_continue(struct SASL *sasl, struct connectdata *conn,
int code, saslprogress *progress);
#endif /* HEADER_CURL_SASL_H */
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