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12471842 PL |
1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
b53bf23e AT |
22 | #ifndef GSS_CONTEXT_HH |
23 | #define GSS_CONTEXT_HH | |
24 | #pragma once | |
25 | ||
26 | #ifdef ENABLE_GSS_TSIG | |
27 | #include <gssapi/gssapi.h> | |
28 | #include <gssapi/gssapi_krb5.h> | |
29 | #include <gssapi/gssapi_ext.h> | |
30 | #endif | |
31 | ||
32 | //! Generic errors | |
33 | enum GssContextError { | |
34 | GSS_CONTEXT_NO_ERROR, | |
35 | GSS_CONTEXT_UNSUPPORTED, | |
36 | GSS_CONTEXT_NOT_FOUND, | |
37 | GSS_CONTEXT_NOT_INITIALIZED, | |
38 | GSS_CONTEXT_INVALID, | |
39 | GSS_CONTEXT_EXPIRED, | |
40 | GSS_CONTEXT_ALREADY_INITIALIZED | |
41 | }; | |
42 | ||
43 | //! GSS context types | |
44 | enum GssContextType { | |
45 | GSS_CONTEXT_NONE, | |
46 | GSS_CONTEXT_INIT, | |
47 | GSS_CONTEXT_ACCEPT | |
48 | }; | |
49 | ||
50 | class GssSecContext; | |
51 | ||
52 | /*! Class for representing GSS names, such as host/host.domain.com@REALM. | |
53 | */ | |
54 | class GssName { | |
55 | public: | |
56 | //! Initialize to empty name | |
57 | GssName() { | |
58 | setName(""); | |
59 | }; | |
60 | ||
319a548e | 61 | //! Initialize using specific name |
b53bf23e AT |
62 | GssName(const std::string& name) { |
63 | setName(name); | |
64 | }; | |
65 | ||
66 | //! Parse name into native representation | |
67 | bool setName(const std::string& name) { | |
68 | #ifdef ENABLE_GSS_TSIG | |
69 | gss_buffer_desc buffer; | |
70 | d_name = GSS_C_NO_NAME; | |
71 | ||
72 | if (!name.empty()) { | |
73 | buffer.length = name.size(); | |
74 | buffer.value = (void*)name.c_str(); | |
75 | d_maj = gss_import_name(&d_min, &buffer, (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, &d_name); | |
76 | return d_maj == GSS_S_COMPLETE; | |
77 | } | |
78 | ||
79 | return true; | |
80 | #endif | |
81 | return false; | |
82 | }; | |
83 | ||
84 | ~GssName() { | |
85 | #ifdef ENABLE_GSS_TSIG | |
86 | if (d_name != GSS_C_NO_NAME) | |
87 | gss_release_name(&d_min, &d_name); | |
88 | #endif | |
89 | }; | |
90 | ||
91 | //! Compare two Gss Names, if no gss support is compiled in, returns false always | |
d51d0c77 | 92 | //! This is not necessarily same as string comparison between two non-parsed names |
b53bf23e AT |
93 | bool operator==(const GssName& rhs) { |
94 | #ifdef ENABLE_GSS_TSIG | |
95 | OM_uint32 maj,min; | |
96 | int result; | |
97 | maj = gss_compare_name(&min, d_name, rhs.d_name, &result); | |
98 | return (maj == GSS_S_COMPLETE && result != 0); | |
99 | #endif | |
100 | return false; | |
101 | } | |
102 | ||
103 | //! Compare two Gss Names, if no gss support is compiled in, returns false always | |
d51d0c77 | 104 | //! This is not necessarily same as string comparison between two non-parsed names |
b53bf23e AT |
105 | bool match(const std::string& name) { |
106 | #ifdef ENABLE_GSS_TSIG | |
107 | OM_uint32 maj,min; | |
108 | int result; | |
109 | gss_name_t comp; | |
110 | gss_buffer_desc buffer; | |
111 | buffer.length = name.size(); | |
112 | buffer.value = (void*)name.c_str(); | |
113 | maj = gss_import_name(&min, &buffer, (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, &comp); | |
114 | if (maj != GSS_S_COMPLETE) | |
335da0ba | 115 | throw PDNSException("Could not import " + name + ": " + std::to_string(maj) + string(",") + std::to_string(min)); |
b53bf23e AT |
116 | // do comparison |
117 | maj = gss_compare_name(&min, d_name, comp, &result); | |
118 | gss_release_name(&min, &comp); | |
119 | return (maj == GSS_S_COMPLETE && result != 0); | |
120 | #else | |
121 | return false; | |
122 | #endif | |
123 | }; | |
124 | ||
125 | //! Check if GSS name was parsed successfully. | |
126 | bool valid() { | |
127 | #ifdef ENABLE_GSS_TSIG | |
128 | return d_maj == GSS_S_COMPLETE; | |
129 | #else | |
130 | return false; | |
131 | #endif | |
132 | } | |
133 | private: | |
134 | #ifdef ENABLE_GSS_TSIG | |
135 | OM_uint32 d_maj,d_min; | |
136 | gss_name_t d_name; | |
137 | #endif | |
138 | }; | |
139 | ||
140 | class GssContext { | |
141 | public: | |
142 | static bool supported(); //<! Returns true if GSS is supported in the first place | |
143 | GssContext(); //<! Construct new GSS context with random name | |
1635f12b | 144 | GssContext(const DNSName& label); //<! Create or open existing named context |
b53bf23e AT |
145 | |
146 | void setLocalPrincipal(const std::string& name); //<! Set our gss name | |
147 | bool getLocalPrincipal(std::string& name); //<! Get our name | |
148 | void setPeerPrincipal(const std::string& name); //<! Set remote name (do not use after negotiation) | |
b5acc3a9 | 149 | bool getPeerPrincipal(std::string &name); //<! Return remote name, returns actual name after negotiation |
b53bf23e AT |
150 | |
151 | void generateLabel(const std::string& suffix); //<! Generate random context name using suffix (such as mydomain.com) | |
1635f12b AT |
152 | void setLabel(const DNSName& label); //<! Set context name to this label |
153 | const DNSName& getLabel() { return d_label; } //<! Return context name | |
b53bf23e AT |
154 | |
155 | bool init(const std::string &input, std::string& output); //<! Perform GSS Initiate Security Context handshake | |
a53f574f | 156 | bool accept(const std::string &input, std::string& output); //<! Perform GSS Accept Security Context handshake |
b53bf23e AT |
157 | bool destroy(); //<! Release the cached context |
158 | bool expired(); //<! Check if context is expired | |
159 | bool valid(); //<! Check if context is valid | |
160 | ||
161 | bool sign(const std::string &input, std::string& output); //<! Sign something using gss | |
162 | bool verify(const std::string &input, const std::string &signature); //<! Validate gss signature with something | |
163 | ||
164 | GssContextError getError(); //<! Get error | |
165 | const std::vector<std::string> getErrorStrings() { return d_gss_errors; } //<! Get native error texts | |
166 | private: | |
167 | void release(); //<! Release context | |
168 | void initialize(); //<! Initialize context | |
169 | #ifdef ENABLE_GSS_TSIG | |
170 | void processError(const string& method, OM_uint32 maj, OM_uint32 min); //<! Process and fill error text vector | |
171 | #endif | |
1635f12b | 172 | DNSName d_label; //<! Context name |
b53bf23e AT |
173 | std::string d_peerPrincipal; //<! Remote name |
174 | std::string d_localPrincipal; //<! Our name | |
175 | GssContextError d_error; //<! Context error | |
176 | GssContextType d_type; //<! Context type | |
177 | std::vector<std::string> d_gss_errors; //<! Native error string(s) | |
178 | boost::shared_ptr<GssSecContext> d_ctx; //<! Attached security context | |
179 | }; | |
180 | ||
21a3792f KM |
181 | bool gss_add_signature(const DNSName& context, const std::string& message, std::string& mac); //<! Create signature |
182 | bool gss_verify_signature(const DNSName& context, const std::string& message, const std::string& mac); //<! Validate signature | |
b53bf23e AT |
183 | |
184 | #endif |