| 1 | #ifndef HEADER_CURL_SASL_H
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| 2 | #define HEADER_CURL_SASL_H
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| 3 | /***************************************************************************
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| 4 | * _ _ ____ _
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| 5 | * Project ___| | | | _ \| |
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| 6 | * / __| | | | |_) | |
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| 7 | * | (__| |_| | _ <| |___
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| 8 | * \___|\___/|_| \_\_____|
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| 9 | *
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| 10 | * Copyright (C) 2012 - 2022, Daniel Stenberg, <[email protected]>, et al.
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| 11 | *
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| 12 | * This software is licensed as described in the file COPYING, which
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| 13 | * you should have received as part of this distribution. The terms
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| 14 | * are also available at https://curl.se/docs/copyright.html.
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| 15 | *
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| 16 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 17 | * copies of the Software, and permit persons to whom the Software is
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| 18 | * furnished to do so, under the terms of the COPYING file.
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| 19 | *
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| 20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 21 | * KIND, either express or implied.
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include <curl/curl.h>
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| 26 |
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| 27 | #include "bufref.h"
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| 28 |
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| 29 | struct Curl_easy;
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| 30 | struct connectdata;
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| 31 |
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| 32 | /* Authentication mechanism flags */
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| 33 | #define SASL_MECH_LOGIN (1 << 0)
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| 34 | #define SASL_MECH_PLAIN (1 << 1)
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| 35 | #define SASL_MECH_CRAM_MD5 (1 << 2)
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| 36 | #define SASL_MECH_DIGEST_MD5 (1 << 3)
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| 37 | #define SASL_MECH_GSSAPI (1 << 4)
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| 38 | #define SASL_MECH_EXTERNAL (1 << 5)
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| 39 | #define SASL_MECH_NTLM (1 << 6)
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| 40 | #define SASL_MECH_XOAUTH2 (1 << 7)
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| 41 | #define SASL_MECH_OAUTHBEARER (1 << 8)
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| 42 | #define SASL_MECH_SCRAM_SHA_1 (1 << 9)
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| 43 | #define SASL_MECH_SCRAM_SHA_256 (1 << 10)
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| 44 |
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| 45 | /* Authentication mechanism values */
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| 46 | #define SASL_AUTH_NONE 0
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| 47 | #define SASL_AUTH_ANY 0xffff
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| 48 | #define SASL_AUTH_DEFAULT (SASL_AUTH_ANY & ~SASL_MECH_EXTERNAL)
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| 49 |
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| 50 | /* Authentication mechanism strings */
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| 51 | #define SASL_MECH_STRING_LOGIN "LOGIN"
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| 52 | #define SASL_MECH_STRING_PLAIN "PLAIN"
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| 53 | #define SASL_MECH_STRING_CRAM_MD5 "CRAM-MD5"
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| 54 | #define SASL_MECH_STRING_DIGEST_MD5 "DIGEST-MD5"
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| 55 | #define SASL_MECH_STRING_GSSAPI "GSSAPI"
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| 56 | #define SASL_MECH_STRING_EXTERNAL "EXTERNAL"
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| 57 | #define SASL_MECH_STRING_NTLM "NTLM"
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| 58 | #define SASL_MECH_STRING_XOAUTH2 "XOAUTH2"
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| 59 | #define SASL_MECH_STRING_OAUTHBEARER "OAUTHBEARER"
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| 60 | #define SASL_MECH_STRING_SCRAM_SHA_1 "SCRAM-SHA-1"
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| 61 | #define SASL_MECH_STRING_SCRAM_SHA_256 "SCRAM-SHA-256"
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| 62 |
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| 63 | /* SASL flags */
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| 64 | #define SASL_FLAG_BASE64 0x0001 /* Messages are base64-encoded */
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| 65 |
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| 66 | /* SASL machine states */
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| 67 | typedef enum {
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| 68 | SASL_STOP,
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| 69 | SASL_PLAIN,
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| 70 | SASL_LOGIN,
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| 71 | SASL_LOGIN_PASSWD,
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| 72 | SASL_EXTERNAL,
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| 73 | SASL_CRAMMD5,
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| 74 | SASL_DIGESTMD5,
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| 75 | SASL_DIGESTMD5_RESP,
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| 76 | SASL_NTLM,
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| 77 | SASL_NTLM_TYPE2MSG,
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| 78 | SASL_GSSAPI,
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| 79 | SASL_GSSAPI_TOKEN,
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| 80 | SASL_GSSAPI_NO_DATA,
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| 81 | SASL_OAUTH2,
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| 82 | SASL_OAUTH2_RESP,
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| 83 | SASL_GSASL,
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| 84 | SASL_CANCEL,
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| 85 | SASL_FINAL
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| 86 | } saslstate;
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| 87 |
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| 88 | /* Progress indicator */
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| 89 | typedef enum {
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| 90 | SASL_IDLE,
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| 91 | SASL_INPROGRESS,
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| 92 | SASL_DONE
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| 93 | } saslprogress;
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| 94 |
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| 95 | /* Protocol dependent SASL parameters */
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| 96 | struct SASLproto {
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| 97 | const char *service; /* The service name */
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| 98 | CURLcode (*sendauth)(struct Curl_easy *data, const char *mech,
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| 99 | const struct bufref *ir);
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| 100 | /* Send authentication command */
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| 101 | CURLcode (*contauth)(struct Curl_easy *data, const char *mech,
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| 102 | const struct bufref *contauth);
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| 103 | /* Send authentication continuation */
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| 104 | CURLcode (*cancelauth)(struct Curl_easy *data, const char *mech);
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| 105 | /* Cancel authentication. */
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| 106 | CURLcode (*getmessage)(struct Curl_easy *data, struct bufref *out);
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| 107 | /* Get SASL response message */
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| 108 | size_t maxirlen; /* Maximum initial response + mechanism length,
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| 109 | or zero if no max. This is normally the max
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| 110 | command length - other characters count.
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| 111 | This has to be zero for non-base64 protocols. */
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| 112 | int contcode; /* Code to receive when continuation is expected */
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| 113 | int finalcode; /* Code to receive upon authentication success */
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| 114 | unsigned short defmechs; /* Mechanisms enabled by default */
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| 115 | unsigned short flags; /* Configuration flags. */
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| 116 | };
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| 117 |
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| 118 | /* Per-connection parameters */
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| 119 | struct SASL {
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| 120 | const struct SASLproto *params; /* Protocol dependent parameters */
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| 121 | saslstate state; /* Current machine state */
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| 122 | const char *curmech; /* Current mechanism id. */
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| 123 | unsigned short authmechs; /* Accepted authentication mechanisms */
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| 124 | unsigned short prefmech; /* Preferred authentication mechanism */
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| 125 | unsigned short authused; /* Auth mechanism used for the connection */
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| 126 | bool resetprefs; /* For URL auth option parsing. */
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| 127 | bool mutual_auth; /* Mutual authentication enabled (GSSAPI only) */
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| 128 | bool force_ir; /* Protocol always supports initial response */
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| 129 | };
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| 130 |
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| 131 | /* This is used to test whether the line starts with the given mechanism */
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| 132 | #define sasl_mech_equal(line, wordlen, mech) \
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| 133 | (wordlen == (sizeof(mech) - 1) / sizeof(char) && \
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| 134 | !memcmp(line, mech, wordlen))
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| 135 |
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| 136 | /* This is used to cleanup any libraries or curl modules used by the sasl
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| 137 | functions */
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| 138 | void Curl_sasl_cleanup(struct connectdata *conn, unsigned short authused);
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| 139 |
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| 140 | /* Convert a mechanism name to a token */
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| 141 | unsigned short Curl_sasl_decode_mech(const char *ptr,
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| 142 | size_t maxlen, size_t *len);
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| 143 |
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| 144 | /* Parse the URL login options */
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| 145 | CURLcode Curl_sasl_parse_url_auth_option(struct SASL *sasl,
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| 146 | const char *value, size_t len);
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| 147 |
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| 148 | /* Initializes an SASL structure */
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| 149 | void Curl_sasl_init(struct SASL *sasl, struct Curl_easy *data,
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| 150 | const struct SASLproto *params);
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| 151 |
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| 152 | /* Check if we have enough auth data and capabilities to authenticate */
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| 153 | bool Curl_sasl_can_authenticate(struct SASL *sasl, struct Curl_easy *data);
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| 154 |
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| 155 | /* Calculate the required login details for SASL authentication */
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| 156 | CURLcode Curl_sasl_start(struct SASL *sasl, struct Curl_easy *data,
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| 157 | bool force_ir, saslprogress *progress);
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| 158 |
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| 159 | /* Continue an SASL authentication */
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| 160 | CURLcode Curl_sasl_continue(struct SASL *sasl, struct Curl_easy *data,
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| 161 | int code, saslprogress *progress);
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| 162 |
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| 163 | #endif /* HEADER_CURL_SASL_H */
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