1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2014 - 2021, Steve Holme, <steve_holme@hotmail.com>.
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.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#include <curl/curl.h>
26
27#include "vauth.h"
28#include "curl_multibyte.h"
29#include "curl_printf.h"
30
31/* The last #include files should be: */
32#include "curl_memory.h"
33#include "memdebug.h"
34
35/*
36 * Curl_auth_build_spn()
37 *
38 * This is used to build a SPN string in the following formats:
39 *
40 * service/host@realm (Not currently used)
41 * service/host (Not used by GSS-API)
42 * service@realm (Not used by Windows SSPI)
43 *
44 * Parameters:
45 *
46 * service [in] - The service type such as http, smtp, pop or imap.
47 * host [in] - The host name.
48 * realm [in] - The realm.
49 *
50 * Returns a pointer to the newly allocated SPN.
51 */
52#if !defined(USE_WINDOWS_SSPI)
53char *Curl_auth_build_spn(const char *service, const char *host,
54 const char *realm)
55{
56 char *spn = NULL;
57
58 /* Generate our SPN */
59 if(host && realm)
60 spn = aprintf("%s/%s@%s", service, host, realm);
61 else if(host)
62 spn = aprintf("%s/%s", service, host);
63 else if(realm)
64 spn = aprintf("%s@%s", service, realm);
65
66 /* Return our newly allocated SPN */
67 return spn;
68}
69#else
70TCHAR *Curl_auth_build_spn(const char *service, const char *host,
71 const char *realm)
72{
73 char *utf8_spn = NULL;
74 TCHAR *tchar_spn = NULL;
75 TCHAR *dupe_tchar_spn = NULL;
76
77 (void) realm;
78
79 /* Note: We could use DsMakeSPN() or DsClientMakeSpnForTargetServer() rather
80 than doing this ourselves but the first is only available in Windows XP
81 and Windows Server 2003 and the latter is only available in Windows 2000
82 but not Windows95/98/ME or Windows NT4.0 unless the Active Directory
83 Client Extensions are installed. As such it is far simpler for us to
84 formulate the SPN instead. */
85
86 /* Generate our UTF8 based SPN */
87 utf8_spn = aprintf("%s/%s", service, host);
88 if(!utf8_spn)
89 return NULL;
90
91 /* Allocate and return a TCHAR based SPN. Since curlx_convert_UTF8_to_tchar
92 must be freed by curlx_unicodefree we'll dupe the result so that the
93 pointer this function returns can be normally free'd. */
94 tchar_spn = curlx_convert_UTF8_to_tchar(utf8_spn);
95 free(utf8_spn);
96 if(!tchar_spn)
97 return NULL;
98 dupe_tchar_spn = _tcsdup(tchar_spn);
99 curlx_unicodefree(tchar_spn);
100 return dupe_tchar_spn;
101}
102#endif /* USE_WINDOWS_SSPI */
103
104/*
105 * Curl_auth_user_contains_domain()
106 *
107 * This is used to test if the specified user contains a Windows domain name as
108 * follows:
109 *
110 * Domain\User (Down-level Logon Name)
111 * Domain/User (curl Down-level format - for compatibility with existing code)
112 * User@Domain (User Principal Name)
113 *
114 * Note: The user name may be empty when using a GSS-API library or Windows
115 * SSPI as the user and domain are either obtained from the credentials cache
116 * when using GSS-API or via the currently logged in user's credentials when
117 * using Windows SSPI.
118 *
119 * Parameters:
120 *
121 * user [in] - The user name.
122 *
123 * Returns TRUE on success; otherwise FALSE.
124 */
125bool Curl_auth_user_contains_domain(const char *user)
126{
127 bool valid = FALSE;
128
129 if(user && *user) {
130 /* Check we have a domain name or UPN present */
131 char *p = strpbrk(user, "\\/@");
132
133 valid = (p != NULL && p > user && p < user + strlen(user) - 1 ? TRUE :
134 FALSE);
135 }
136#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
137 else
138 /* User and domain are obtained from the GSS-API credentials cache or the
139 currently logged in user from Windows */
140 valid = TRUE;
141#endif
142
143 return valid;
144}
145