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1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 2011 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.haxx.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  ***************************************************************************/
22 
23 #include "curl_setup.h"
24 
25 #ifdef HAVE_GSSAPI
26 
27 #include "curl_gssapi.h"
28 #include "sendf.h"
29 
30 /* The last 3 #include files should be in this order */
31 #include "curl_printf.h"
32 #include "curl_memory.h"
33 #include "memdebug.h"
34 
35 static char spnego_oid_bytes[] = "\x2b\x06\x01\x05\x05\x02";
36 gss_OID_desc Curl_spnego_mech_oid = { 6, &spnego_oid_bytes };
37 static char krb5_oid_bytes[] = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02";
38 gss_OID_desc Curl_krb5_mech_oid = { 9, &krb5_oid_bytes };
39 
Curl_gss_init_sec_context(struct Curl_easy * data,OM_uint32 * minor_status,gss_ctx_id_t * context,gss_name_t target_name,gss_OID mech_type,gss_channel_bindings_t input_chan_bindings,gss_buffer_t input_token,gss_buffer_t output_token,const bool mutual_auth,OM_uint32 * ret_flags)40 OM_uint32 Curl_gss_init_sec_context(
41     struct Curl_easy *data,
42     OM_uint32 *minor_status,
43     gss_ctx_id_t *context,
44     gss_name_t target_name,
45     gss_OID mech_type,
46     gss_channel_bindings_t input_chan_bindings,
47     gss_buffer_t input_token,
48     gss_buffer_t output_token,
49     const bool mutual_auth,
50     OM_uint32 *ret_flags)
51 {
52   OM_uint32 req_flags = GSS_C_REPLAY_FLAG;
53 
54   if(mutual_auth)
55     req_flags |= GSS_C_MUTUAL_FLAG;
56 
57   if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_POLICY_FLAG) {
58 #ifdef GSS_C_DELEG_POLICY_FLAG
59     req_flags |= GSS_C_DELEG_POLICY_FLAG;
60 #else
61     infof(data, "warning: support for CURLGSSAPI_DELEGATION_POLICY_FLAG not "
62         "compiled in\n");
63 #endif
64   }
65 
66   if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_FLAG)
67     req_flags |= GSS_C_DELEG_FLAG;
68 
69   return gss_init_sec_context(minor_status,
70                               GSS_C_NO_CREDENTIAL, /* cred_handle */
71                               context,
72                               target_name,
73                               mech_type,
74                               req_flags,
75                               0, /* time_req */
76                               input_chan_bindings,
77                               input_token,
78                               NULL, /* actual_mech_type */
79                               output_token,
80                               ret_flags,
81                               NULL /* time_rec */);
82 }
83 
84 #define GSS_LOG_BUFFER_LEN 1024
display_gss_error(OM_uint32 status,int type,char * buf,size_t len)85 static size_t display_gss_error(OM_uint32 status, int type,
86                                 char *buf, size_t len) {
87   OM_uint32 maj_stat;
88   OM_uint32 min_stat;
89   OM_uint32 msg_ctx = 0;
90   gss_buffer_desc status_string;
91 
92   do {
93     maj_stat = gss_display_status(&min_stat,
94                                   status,
95                                   type,
96                                   GSS_C_NO_OID,
97                                   &msg_ctx,
98                                   &status_string);
99     if(GSS_LOG_BUFFER_LEN > len + status_string.length + 3) {
100       len += msnprintf(buf + len, GSS_LOG_BUFFER_LEN - len,
101                        "%.*s. ", (int)status_string.length,
102                        (char *)status_string.value);
103     }
104     gss_release_buffer(&min_stat, &status_string);
105   } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
106 
107   return len;
108 }
109 
110 /*
111  * Curl_gss_log_error()
112  *
113  * This is used to log a GSS-API error status.
114  *
115  * Parameters:
116  *
117  * data    [in] - The session handle.
118  * prefix  [in] - The prefix of the log message.
119  * major   [in] - The major status code.
120  * minor   [in] - The minor status code.
121  */
Curl_gss_log_error(struct Curl_easy * data,const char * prefix,OM_uint32 major,OM_uint32 minor)122 void Curl_gss_log_error(struct Curl_easy *data, const char *prefix,
123                         OM_uint32 major, OM_uint32 minor)
124 {
125   char buf[GSS_LOG_BUFFER_LEN];
126   size_t len = 0;
127 
128   if(major != GSS_S_FAILURE)
129     len = display_gss_error(major, GSS_C_GSS_CODE, buf, len);
130 
131   display_gss_error(minor, GSS_C_MECH_CODE, buf, len);
132 
133   infof(data, "%s%s\n", prefix, buf);
134 }
135 
136 #endif /* HAVE_GSSAPI */
137