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b08f1315 OM |
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 | */ | |
22 | #pragma once | |
23 | ||
15e39ee4 | 24 | #ifdef HAVE_CONFIG_H |
b08f1315 | 25 | #include "config.h" |
15e39ee4 | 26 | #endif |
b08f1315 OM |
27 | |
28 | #include "namespaces.hh" | |
29 | #include "pdnsexception.hh" | |
30 | #include "dns.hh" | |
31 | ||
32 | #ifdef ENABLE_GSS_TSIG | |
33 | #include <gssapi/gssapi.h> | |
34 | #include <gssapi/gssapi_krb5.h> | |
c113acc3 | 35 | extern bool g_doGssTSIG; |
b08f1315 OM |
36 | #endif |
37 | ||
b08f1315 OM |
38 | //! Generic errors |
39 | enum GssContextError | |
40 | { | |
41 | GSS_CONTEXT_NO_ERROR, | |
42 | GSS_CONTEXT_UNSUPPORTED, | |
43 | GSS_CONTEXT_NOT_FOUND, | |
44 | GSS_CONTEXT_NOT_INITIALIZED, | |
45 | GSS_CONTEXT_INVALID, | |
46 | GSS_CONTEXT_EXPIRED, | |
47 | GSS_CONTEXT_ALREADY_INITIALIZED | |
48 | }; | |
49 | ||
50 | //! GSS context types | |
51 | enum GssContextType | |
52 | { | |
53 | GSS_CONTEXT_NONE, | |
54 | GSS_CONTEXT_INIT, | |
55 | GSS_CONTEXT_ACCEPT | |
56 | }; | |
57 | ||
58 | class GssSecContext; | |
59 | ||
60 | /*! Class for representing GSS names, such as host/host.domain.com@REALM. | |
f13cde2a | 61 | */ |
b08f1315 OM |
62 | class GssName |
63 | { | |
64 | public: | |
65 | //! Initialize to empty name | |
66 | GssName() | |
67 | { | |
68 | setName(""); | |
69 | }; | |
70 | ||
71 | //! Initialize using specific name | |
72 | GssName(const std::string& name) | |
73 | { | |
74 | setName(name); | |
75 | }; | |
76 | ||
8b428a6b | 77 | #ifdef ENABLE_GSS_TSIG |
b08f1315 OM |
78 | //! Parse name into native representation |
79 | bool setName(const std::string& name) | |
80 | { | |
b08f1315 OM |
81 | gss_buffer_desc buffer; |
82 | d_name = GSS_C_NO_NAME; | |
83 | ||
84 | if (!name.empty()) { | |
85 | buffer.length = name.size(); | |
86 | buffer.value = (void*)name.c_str(); | |
87 | d_maj = gss_import_name(&d_min, &buffer, (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, &d_name); | |
88 | return d_maj == GSS_S_COMPLETE; | |
89 | } | |
90 | ||
91 | return true; | |
8b428a6b FM |
92 | } |
93 | #else | |
94 | bool setName(const std::string& /* name */) | |
95 | { | |
b08f1315 | 96 | return false; |
8b428a6b FM |
97 | } |
98 | #endif | |
b08f1315 OM |
99 | |
100 | ~GssName() | |
101 | { | |
102 | #ifdef ENABLE_GSS_TSIG | |
103 | if (d_name != GSS_C_NO_NAME) | |
104 | gss_release_name(&d_min, &d_name); | |
105 | #endif | |
106 | }; | |
107 | ||
8b428a6b | 108 | #ifdef ENABLE_GSS_TSIG |
b08f1315 OM |
109 | //! Compare two Gss Names, if no gss support is compiled in, returns false always |
110 | //! This is not necessarily same as string comparison between two non-parsed names | |
111 | bool operator==(const GssName& rhs) | |
112 | { | |
b08f1315 OM |
113 | OM_uint32 maj, min; |
114 | int result; | |
115 | maj = gss_compare_name(&min, d_name, rhs.d_name, &result); | |
116 | return (maj == GSS_S_COMPLETE && result != 0); | |
8b428a6b FM |
117 | } |
118 | #else | |
119 | bool operator==(const GssName& /* rhs */) | |
120 | { | |
b08f1315 OM |
121 | return false; |
122 | } | |
8b428a6b | 123 | #endif |
b08f1315 | 124 | |
8b428a6b | 125 | #ifdef ENABLE_GSS_TSIG |
b08f1315 OM |
126 | //! Compare two Gss Names, if no gss support is compiled in, returns false always |
127 | //! This is not necessarily same as string comparison between two non-parsed names | |
128 | bool match(const std::string& name) | |
129 | { | |
b08f1315 OM |
130 | OM_uint32 maj, min; |
131 | int result; | |
132 | gss_name_t comp; | |
133 | gss_buffer_desc buffer; | |
134 | buffer.length = name.size(); | |
135 | buffer.value = (void*)name.c_str(); | |
136 | maj = gss_import_name(&min, &buffer, (gss_OID)GSS_KRB5_NT_PRINCIPAL_NAME, &comp); | |
137 | if (maj != GSS_S_COMPLETE) | |
138 | throw PDNSException("Could not import " + name + ": " + std::to_string(maj) + string(",") + std::to_string(min)); | |
139 | // do comparison | |
140 | maj = gss_compare_name(&min, d_name, comp, &result); | |
141 | gss_release_name(&min, &comp); | |
142 | return (maj == GSS_S_COMPLETE && result != 0); | |
8b428a6b | 143 | } |
b08f1315 | 144 | #else |
8b428a6b FM |
145 | bool match(const std::string& /* name */) |
146 | { | |
b08f1315 | 147 | return false; |
8b428a6b | 148 | } |
b08f1315 | 149 | #endif |
b08f1315 OM |
150 | |
151 | //! Check if GSS name was parsed successfully. | |
152 | bool valid() | |
153 | { | |
154 | #ifdef ENABLE_GSS_TSIG | |
155 | return d_maj == GSS_S_COMPLETE; | |
156 | #else | |
157 | return false; | |
158 | #endif | |
159 | } | |
160 | ||
161 | private: | |
162 | #ifdef ENABLE_GSS_TSIG | |
163 | OM_uint32 d_maj, d_min; | |
164 | gss_name_t d_name; | |
165 | #endif | |
dd0ef5ed | 166 | }; // GssName |
b08f1315 OM |
167 | |
168 | class GssContext | |
169 | { | |
170 | public: | |
dd0ef5ed | 171 | static std::tuple<size_t, size_t, size_t> getCounts(); |
b08f1315 OM |
172 | static bool supported(); //<! Returns true if GSS is supported in the first place |
173 | GssContext(); //<! Construct new GSS context with random name | |
174 | GssContext(const DNSName& label); //<! Create or open existing named context | |
175 | ||
176 | void setLocalPrincipal(const std::string& name); //<! Set our gss name | |
177 | bool getLocalPrincipal(std::string& name); //<! Get our name | |
178 | void setPeerPrincipal(const std::string& name); //<! Set remote name (do not use after negotiation) | |
179 | bool getPeerPrincipal(std::string& name); //<! Return remote name, returns actual name after negotiation | |
180 | ||
181 | void generateLabel(const std::string& suffix); //<! Generate random context name using suffix (such as mydomain.com) | |
182 | void setLabel(const DNSName& label); //<! Set context name to this label | |
183 | const DNSName& getLabel() { return d_label; } //<! Return context name | |
184 | ||
185 | bool init(const std::string& input, std::string& output); //<! Perform GSS Initiate Security Context handshake | |
186 | bool accept(const std::string& input, std::string& output); //<! Perform GSS Accept Security Context handshake | |
187 | bool destroy(); //<! Release the cached context | |
188 | bool expired(); //<! Check if context is expired | |
189 | bool valid(); //<! Check if context is valid | |
190 | ||
191 | bool sign(const std::string& input, std::string& output); //<! Sign something using gss | |
192 | bool verify(const std::string& input, const std::string& signature); //<! Validate gss signature with something | |
193 | ||
194 | GssContextError getError(); //<! Get error | |
195 | const std::vector<std::string> getErrorStrings() { return d_gss_errors; } //<! Get native error texts | |
196 | private: | |
197 | void release(); //<! Release context | |
198 | void initialize(); //<! Initialize context | |
199 | #ifdef ENABLE_GSS_TSIG | |
200 | void processError(const string& method, OM_uint32 maj, OM_uint32 min); //<! Process and fill error text vector | |
201 | #endif | |
202 | DNSName d_label; //<! Context name | |
203 | std::string d_peerPrincipal; //<! Remote name | |
204 | std::string d_localPrincipal; //<! Our name | |
205 | GssContextError d_error; //<! Context error | |
206 | GssContextType d_type; //<! Context type | |
207 | std::vector<std::string> d_gss_errors; //<! Native error string(s) | |
dd0ef5ed OM |
208 | std::shared_ptr<GssSecContext> d_secctx; //<! Attached security context |
209 | }; // GssContext | |
b08f1315 OM |
210 | |
211 | bool gss_add_signature(const DNSName& context, const std::string& message, std::string& mac); //<! Create signature | |
212 | bool gss_verify_signature(const DNSName& context, const std::string& message, const std::string& mac); //<! Validate signature |