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#ifndef HEADER_CURL_SASL_H
#define HEADER_CURL_SASL_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012 - 2022, 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 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"
struct Curl_easy;
struct connectdata;
/* 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)
#define SASL_MECH_OAUTHBEARER (1 << 8)
#define SASL_MECH_SCRAM_SHA_1 (1 << 9)
#define SASL_MECH_SCRAM_SHA_256 (1 << 10)
/* Authentication mechanism values */
#define SASL_AUTH_NONE 0
#define SASL_AUTH_ANY 0xffff
#define SASL_AUTH_DEFAULT (SASL_AUTH_ANY & ~SASL_MECH_EXTERNAL)
/* 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"
#define SASL_MECH_STRING_OAUTHBEARER "OAUTHBEARER"
#define SASL_MECH_STRING_SCRAM_SHA_1 "SCRAM-SHA-1"
#define SASL_MECH_STRING_SCRAM_SHA_256 "SCRAM-SHA-256"
/* SASL flags */
#define SASL_FLAG_BASE64 0x0001 /* Messages are base64-encoded */
/* 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_OAUTH2,
SASL_OAUTH2_RESP,
SASL_GSASL,
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 */
CURLcode (*sendauth)(struct Curl_easy *data, const char *mech,
const struct bufref *ir);
/* Send authentication command */
CURLcode (*contauth)(struct Curl_easy *data, const char *mech,
const struct bufref *contauth);
/* Send authentication continuation */
CURLcode (*cancelauth)(struct Curl_easy *data, const char *mech);
/* Cancel authentication. */
CURLcode (*getmessage)(struct Curl_easy *data, struct bufref *out);
/* Get SASL response message */
size_t maxirlen; /* Maximum initial response + mechanism length,
or zero if no max. This is normally the max
command length - other characters count.
This has to be zero for non-base64 protocols. */
int contcode; /* Code to receive when continuation is expected */
int finalcode; /* Code to receive upon authentication success */
unsigned short defmechs; /* Mechanisms enabled by default */
unsigned short flags; /* Configuration flags. */
};
/* Per-connection parameters */
struct SASL {
const struct SASLproto *params; /* Protocol dependent parameters */
saslstate state; /* Current machine state */
const char *curmech; /* Current mechanism id. */
unsigned short authmechs; /* Accepted authentication mechanisms */
unsigned short prefmech; /* Preferred authentication mechanism */
unsigned short 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 cleanup any libraries or curl modules used by the sasl
functions */
void Curl_sasl_cleanup(struct connectdata *conn, unsigned short authused);
/* Convert a mechanism name to a token */
unsigned short 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, struct Curl_easy *data,
const struct SASLproto *params);
/* Check if we have enough auth data and capabilities to authenticate */
bool Curl_sasl_can_authenticate(struct SASL *sasl, struct Curl_easy *data);
/* Calculate the required login details for SASL authentication */
CURLcode Curl_sasl_start(struct SASL *sasl, struct Curl_easy *data,
bool force_ir, saslprogress *progress);
/* Continue an SASL authentication */
CURLcode Curl_sasl_continue(struct SASL *sasl, struct Curl_easy *data,
int code, saslprogress *progress);
#endif /* HEADER_CURL_SASL_H */
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