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1 | #ifndef NO_GSSAPI |
2 | |
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3 | #include "putty.h" |
4 | |
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5 | #define SECURITY_WIN32 |
6 | #include <security.h> |
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7 | |
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8 | #include "sshgss.h" |
9 | #include "misc.h" |
10 | |
11 | #define NOTHING |
12 | #define DECL_SSPI_FUNCTION(linkage, rettype, name, params) \ |
13 | typedef rettype (WINAPI *t_##name) params; \ |
14 | linkage t_##name p_##name |
15 | #define GET_SSPI_FUNCTION(module, name) \ |
16 | p_##name = module ? (t_##name) GetProcAddress(module, #name) : NULL |
17 | |
18 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
19 | AcquireCredentialsHandleA, |
20 | (SEC_CHAR *, SEC_CHAR *, ULONG, PLUID, |
21 | PVOID, SEC_GET_KEY_FN, PVOID, PCredHandle, PTimeStamp)); |
22 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
23 | InitializeSecurityContextA, |
24 | (PCredHandle, PCtxtHandle, SEC_CHAR *, ULONG, ULONG, |
25 | ULONG, PSecBufferDesc, ULONG, PCtxtHandle, |
26 | PSecBufferDesc, PULONG, PTimeStamp)); |
27 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
28 | FreeContextBuffer, |
29 | (PVOID)); |
30 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
31 | FreeCredentialsHandle, |
32 | (PCredHandle)); |
33 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
34 | DeleteSecurityContext, |
35 | (PCtxtHandle)); |
36 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
37 | QueryContextAttributesA, |
38 | (PCtxtHandle, ULONG, PVOID)); |
39 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
40 | MakeSignature, |
41 | (PCtxtHandle, ULONG, PSecBufferDesc, ULONG)); |
42 | |
43 | static HMODULE security_module = NULL; |
44 | |
45 | typedef struct winSsh_gss_ctx { |
46 | unsigned long maj_stat; |
47 | unsigned long min_stat; |
48 | CredHandle cred_handle; |
49 | CtxtHandle context; |
50 | PCtxtHandle context_handle; |
51 | TimeStamp expiry; |
52 | } winSsh_gss_ctx; |
53 | |
54 | |
55 | const Ssh_gss_buf gss_mech_krb5={9,"\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}; |
56 | |
57 | int ssh_gss_init(void) |
58 | { |
59 | if (security_module) |
60 | return 1; /* already initialised */ |
61 | |
62 | security_module = LoadLibrary("secur32.dll"); |
63 | if (security_module) { |
64 | GET_SSPI_FUNCTION(security_module, AcquireCredentialsHandleA); |
65 | GET_SSPI_FUNCTION(security_module, InitializeSecurityContextA); |
66 | GET_SSPI_FUNCTION(security_module, FreeContextBuffer); |
67 | GET_SSPI_FUNCTION(security_module, FreeCredentialsHandle); |
68 | GET_SSPI_FUNCTION(security_module, DeleteSecurityContext); |
69 | GET_SSPI_FUNCTION(security_module, QueryContextAttributesA); |
70 | GET_SSPI_FUNCTION(security_module, MakeSignature); |
71 | return 1; |
72 | } |
73 | return 0; |
74 | } |
75 | |
76 | Ssh_gss_stat ssh_gss_indicate_mech(Ssh_gss_buf *mech) |
77 | { |
78 | *mech = gss_mech_krb5; |
79 | return SSH_GSS_OK; |
80 | } |
81 | |
82 | |
83 | Ssh_gss_stat ssh_gss_import_name(char *host, Ssh_gss_name *srv_name) |
84 | { |
85 | char *pStr; |
86 | |
87 | /* Check hostname */ |
88 | if (host == NULL) return SSH_GSS_FAILURE; |
89 | |
90 | /* copy it into form host/FQDN */ |
91 | pStr = dupcat("host/", host, NULL); |
92 | |
93 | *srv_name = (Ssh_gss_name) pStr; |
94 | |
95 | return SSH_GSS_OK; |
96 | } |
97 | |
98 | Ssh_gss_stat ssh_gss_acquire_cred(Ssh_gss_ctx *ctx) |
99 | { |
100 | winSsh_gss_ctx *winctx = snew(winSsh_gss_ctx); |
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101 | memset(winctx, 0, sizeof(winSsh_gss_ctx)); |
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102 | |
103 | /* prepare our "wrapper" structure */ |
104 | winctx->maj_stat = winctx->min_stat = SEC_E_OK; |
105 | winctx->context_handle = NULL; |
106 | |
107 | /* Specifying no principal name here means use the credentials of |
108 | the current logged-in user */ |
109 | |
110 | winctx->maj_stat = p_AcquireCredentialsHandleA(NULL, |
111 | "Kerberos", |
112 | SECPKG_CRED_OUTBOUND, |
113 | NULL, |
114 | NULL, |
115 | NULL, |
116 | NULL, |
117 | &winctx->cred_handle, |
118 | &winctx->expiry); |
119 | |
120 | if (winctx->maj_stat != SEC_E_OK) return SSH_GSS_FAILURE; |
121 | |
122 | *ctx = (Ssh_gss_ctx) winctx; |
123 | return SSH_GSS_OK; |
124 | } |
125 | |
126 | |
127 | Ssh_gss_stat ssh_gss_init_sec_context(Ssh_gss_ctx *ctx, |
128 | Ssh_gss_name srv_name, |
129 | int to_deleg, |
130 | Ssh_gss_buf *recv_tok, |
131 | Ssh_gss_buf *send_tok) |
132 | { |
133 | winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) *ctx; |
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134 | SecBuffer wsend_tok = {send_tok->length,SECBUFFER_TOKEN,send_tok->value}; |
135 | SecBuffer wrecv_tok = {recv_tok->length,SECBUFFER_TOKEN,recv_tok->value}; |
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136 | SecBufferDesc output_desc={SECBUFFER_VERSION,1,&wsend_tok}; |
137 | SecBufferDesc input_desc ={SECBUFFER_VERSION,1,&wrecv_tok}; |
138 | unsigned long flags=ISC_REQ_MUTUAL_AUTH|ISC_REQ_REPLAY_DETECT| |
139 | ISC_REQ_CONFIDENTIALITY|ISC_REQ_ALLOCATE_MEMORY; |
140 | unsigned long ret_flags=0; |
141 | |
142 | /* check if we have to delegate ... */ |
143 | if (to_deleg) flags |= ISC_REQ_DELEGATE; |
144 | winctx->maj_stat = p_InitializeSecurityContextA(&winctx->cred_handle, |
145 | winctx->context_handle, |
146 | (char*) srv_name, |
147 | flags, |
148 | 0, /* reserved */ |
149 | SECURITY_NATIVE_DREP, |
150 | &input_desc, |
151 | 0, /* reserved */ |
152 | &winctx->context, |
153 | &output_desc, |
154 | &ret_flags, |
155 | &winctx->expiry); |
156 | |
157 | /* prepare for the next round */ |
158 | winctx->context_handle = &winctx->context; |
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159 | send_tok->value = wsend_tok.pvBuffer; |
160 | send_tok->length = wsend_tok.cbBuffer; |
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161 | |
162 | /* check & return our status */ |
163 | if (winctx->maj_stat==SEC_E_OK) return SSH_GSS_S_COMPLETE; |
164 | if (winctx->maj_stat==SEC_I_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED; |
165 | |
166 | return SSH_GSS_FAILURE; |
167 | } |
168 | |
169 | Ssh_gss_stat ssh_gss_free_tok(Ssh_gss_buf *send_tok) |
170 | { |
171 | /* check input */ |
172 | if (send_tok == NULL) return SSH_GSS_FAILURE; |
173 | |
174 | /* free Windows buffer */ |
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175 | p_FreeContextBuffer(send_tok->value); |
176 | SSH_GSS_CLEAR_BUF(send_tok); |
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177 | |
178 | return SSH_GSS_OK; |
179 | } |
180 | |
181 | Ssh_gss_stat ssh_gss_release_cred(Ssh_gss_ctx *ctx) |
182 | { |
183 | winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) *ctx; |
184 | |
185 | /* check input */ |
186 | if (winctx == NULL) return SSH_GSS_FAILURE; |
187 | |
188 | /* free Windows data */ |
189 | p_FreeCredentialsHandle(&winctx->cred_handle); |
190 | p_DeleteSecurityContext(&winctx->context); |
191 | |
192 | /* delete our "wrapper" structure */ |
193 | sfree(winctx); |
194 | *ctx = (Ssh_gss_ctx) NULL; |
195 | |
196 | return SSH_GSS_OK; |
197 | } |
198 | |
199 | |
200 | Ssh_gss_stat ssh_gss_release_name(Ssh_gss_name *srv_name) |
201 | { |
202 | char *pStr= (char *) *srv_name; |
203 | |
204 | if (pStr == NULL) return SSH_GSS_FAILURE; |
205 | sfree(pStr); |
206 | *srv_name = (Ssh_gss_name) NULL; |
207 | |
208 | return SSH_GSS_OK; |
209 | } |
210 | |
211 | Ssh_gss_stat ssh_gss_display_status(Ssh_gss_ctx ctx, Ssh_gss_buf *buf) |
212 | { |
213 | winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) ctx; |
214 | char *msg; |
215 | |
216 | if (winctx == NULL) return SSH_GSS_FAILURE; |
217 | |
218 | /* decode the error code */ |
219 | switch (winctx->maj_stat) { |
220 | case SEC_E_OK: msg="SSPI status OK"; break; |
221 | case SEC_E_INVALID_HANDLE: msg="The handle passed to the function" |
222 | " is invalid."; |
223 | break; |
224 | case SEC_E_TARGET_UNKNOWN: msg="The target was not recognized."; break; |
225 | case SEC_E_LOGON_DENIED: msg="The logon failed."; break; |
226 | case SEC_E_INTERNAL_ERROR: msg="The Local Security Authority cannot" |
227 | " be contacted."; |
228 | break; |
229 | case SEC_E_NO_CREDENTIALS: msg="No credentials are available in the" |
230 | " security package."; |
231 | break; |
232 | case SEC_E_NO_AUTHENTICATING_AUTHORITY: |
233 | msg="No authority could be contacted for authentication." |
234 | "The domain name of the authenticating party could be wrong," |
235 | " the domain could be unreachable, or there might have been" |
236 | " a trust relationship failure."; |
237 | break; |
238 | case SEC_E_INSUFFICIENT_MEMORY: |
239 | msg="One or more of the SecBufferDesc structures passed as" |
240 | " an OUT parameter has a buffer that is too small."; |
241 | break; |
242 | case SEC_E_INVALID_TOKEN: |
243 | msg="The error is due to a malformed input token, such as a" |
244 | " token corrupted in transit, a token" |
245 | " of incorrect size, or a token passed into the wrong" |
246 | " security package. Passing a token to" |
247 | " the wrong package can happen if client and server did not" |
248 | " negotiate the proper security package."; |
249 | break; |
250 | default: |
251 | msg = "Internal SSPI error"; |
252 | break; |
253 | } |
254 | |
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255 | buf->value = dupstr(msg); |
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256 | buf->length = strlen(buf->value); |
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257 | |
258 | return SSH_GSS_OK; |
259 | } |
260 | |
261 | Ssh_gss_stat ssh_gss_get_mic(Ssh_gss_ctx ctx, Ssh_gss_buf *buf, |
262 | Ssh_gss_buf *hash) |
263 | { |
264 | winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx; |
265 | SecPkgContext_Sizes ContextSizes; |
266 | SecBufferDesc InputBufferDescriptor; |
267 | SecBuffer InputSecurityToken[2]; |
268 | |
269 | if (winctx == NULL) return SSH_GSS_FAILURE; |
270 | |
271 | winctx->maj_stat = 0; |
272 | |
273 | memset(&ContextSizes, 0, sizeof(ContextSizes)); |
274 | |
275 | winctx->maj_stat = p_QueryContextAttributesA(&winctx->context, |
276 | SECPKG_ATTR_SIZES, |
277 | &ContextSizes); |
278 | |
279 | if (winctx->maj_stat != SEC_E_OK || |
280 | ContextSizes.cbMaxSignature == 0) |
281 | return winctx->maj_stat; |
282 | |
283 | InputBufferDescriptor.cBuffers = 2; |
284 | InputBufferDescriptor.pBuffers = InputSecurityToken; |
285 | InputBufferDescriptor.ulVersion = SECBUFFER_VERSION; |
286 | InputSecurityToken[0].BufferType = SECBUFFER_DATA; |
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287 | InputSecurityToken[0].cbBuffer = buf->length; |
288 | InputSecurityToken[0].pvBuffer = buf->value; |
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289 | InputSecurityToken[1].BufferType = SECBUFFER_TOKEN; |
290 | InputSecurityToken[1].cbBuffer = ContextSizes.cbMaxSignature; |
291 | InputSecurityToken[1].pvBuffer = snewn(ContextSizes.cbMaxSignature, char); |
292 | |
293 | winctx->maj_stat = p_MakeSignature(&winctx->context, |
294 | 0, |
295 | &InputBufferDescriptor, |
296 | 0); |
297 | |
298 | if (winctx->maj_stat == SEC_E_OK) { |
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299 | hash->length = InputSecurityToken[1].cbBuffer; |
300 | hash->value = InputSecurityToken[1].pvBuffer; |
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301 | } |
302 | |
303 | return winctx->maj_stat; |
304 | } |
305 | |
306 | Ssh_gss_stat ssh_gss_free_mic(Ssh_gss_buf *hash) |
307 | { |
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308 | sfree(hash->value); |
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309 | return SSH_GSS_OK; |
310 | } |
311 | |
312 | #else |
313 | |
314 | /* Dummy function so this source file defines something if NO_GSSAPI |
315 | is defined. */ |
316 | |
317 | int ssh_gss_init(void) |
318 | { |
319 | return 0; |
320 | } |
321 | |
322 | #endif |