42af6a67 |
1 | #ifndef NO_GSSAPI |
2 | |
3 | #include <windows.h> |
4 | #define SECURITY_WIN32 |
5 | #include <security.h> |
6 | #include "sshgss.h" |
7 | #include "misc.h" |
8 | |
9 | #define NOTHING |
10 | #define DECL_SSPI_FUNCTION(linkage, rettype, name, params) \ |
11 | typedef rettype (WINAPI *t_##name) params; \ |
12 | linkage t_##name p_##name |
13 | #define GET_SSPI_FUNCTION(module, name) \ |
14 | p_##name = module ? (t_##name) GetProcAddress(module, #name) : NULL |
15 | |
16 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
17 | AcquireCredentialsHandleA, |
18 | (SEC_CHAR *, SEC_CHAR *, ULONG, PLUID, |
19 | PVOID, SEC_GET_KEY_FN, PVOID, PCredHandle, PTimeStamp)); |
20 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
21 | InitializeSecurityContextA, |
22 | (PCredHandle, PCtxtHandle, SEC_CHAR *, ULONG, ULONG, |
23 | ULONG, PSecBufferDesc, ULONG, PCtxtHandle, |
24 | PSecBufferDesc, PULONG, PTimeStamp)); |
25 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
26 | FreeContextBuffer, |
27 | (PVOID)); |
28 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
29 | FreeCredentialsHandle, |
30 | (PCredHandle)); |
31 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
32 | DeleteSecurityContext, |
33 | (PCtxtHandle)); |
34 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
35 | QueryContextAttributesA, |
36 | (PCtxtHandle, ULONG, PVOID)); |
37 | DECL_SSPI_FUNCTION(static, SECURITY_STATUS, |
38 | MakeSignature, |
39 | (PCtxtHandle, ULONG, PSecBufferDesc, ULONG)); |
40 | |
41 | static HMODULE security_module = NULL; |
42 | |
43 | typedef struct winSsh_gss_ctx { |
44 | unsigned long maj_stat; |
45 | unsigned long min_stat; |
46 | CredHandle cred_handle; |
47 | CtxtHandle context; |
48 | PCtxtHandle context_handle; |
49 | TimeStamp expiry; |
50 | } winSsh_gss_ctx; |
51 | |
52 | |
53 | const Ssh_gss_buf gss_mech_krb5={9,"\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}; |
54 | |
55 | int ssh_gss_init(void) |
56 | { |
57 | if (security_module) |
58 | return 1; /* already initialised */ |
59 | |
60 | security_module = LoadLibrary("secur32.dll"); |
61 | if (security_module) { |
62 | GET_SSPI_FUNCTION(security_module, AcquireCredentialsHandleA); |
63 | GET_SSPI_FUNCTION(security_module, InitializeSecurityContextA); |
64 | GET_SSPI_FUNCTION(security_module, FreeContextBuffer); |
65 | GET_SSPI_FUNCTION(security_module, FreeCredentialsHandle); |
66 | GET_SSPI_FUNCTION(security_module, DeleteSecurityContext); |
67 | GET_SSPI_FUNCTION(security_module, QueryContextAttributesA); |
68 | GET_SSPI_FUNCTION(security_module, MakeSignature); |
69 | return 1; |
70 | } |
71 | return 0; |
72 | } |
73 | |
74 | Ssh_gss_stat ssh_gss_indicate_mech(Ssh_gss_buf *mech) |
75 | { |
76 | *mech = gss_mech_krb5; |
77 | return SSH_GSS_OK; |
78 | } |
79 | |
80 | |
81 | Ssh_gss_stat ssh_gss_import_name(char *host, Ssh_gss_name *srv_name) |
82 | { |
83 | char *pStr; |
84 | |
85 | /* Check hostname */ |
86 | if (host == NULL) return SSH_GSS_FAILURE; |
87 | |
88 | /* copy it into form host/FQDN */ |
89 | pStr = dupcat("host/", host, NULL); |
90 | |
91 | *srv_name = (Ssh_gss_name) pStr; |
92 | |
93 | return SSH_GSS_OK; |
94 | } |
95 | |
96 | Ssh_gss_stat ssh_gss_acquire_cred(Ssh_gss_ctx *ctx) |
97 | { |
98 | winSsh_gss_ctx *winctx = snew(winSsh_gss_ctx); |
99 | |
100 | /* prepare our "wrapper" structure */ |
101 | winctx->maj_stat = winctx->min_stat = SEC_E_OK; |
102 | winctx->context_handle = NULL; |
103 | |
104 | /* Specifying no principal name here means use the credentials of |
105 | the current logged-in user */ |
106 | |
107 | winctx->maj_stat = p_AcquireCredentialsHandleA(NULL, |
108 | "Kerberos", |
109 | SECPKG_CRED_OUTBOUND, |
110 | NULL, |
111 | NULL, |
112 | NULL, |
113 | NULL, |
114 | &winctx->cred_handle, |
115 | &winctx->expiry); |
116 | |
117 | if (winctx->maj_stat != SEC_E_OK) return SSH_GSS_FAILURE; |
118 | |
119 | *ctx = (Ssh_gss_ctx) winctx; |
120 | return SSH_GSS_OK; |
121 | } |
122 | |
123 | |
124 | Ssh_gss_stat ssh_gss_init_sec_context(Ssh_gss_ctx *ctx, |
125 | Ssh_gss_name srv_name, |
126 | int to_deleg, |
127 | Ssh_gss_buf *recv_tok, |
128 | Ssh_gss_buf *send_tok) |
129 | { |
130 | winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) *ctx; |
131 | SecBuffer wsend_tok = {send_tok->len,SECBUFFER_TOKEN,send_tok->data}; |
132 | SecBuffer wrecv_tok = {recv_tok->len,SECBUFFER_TOKEN,recv_tok->data}; |
133 | SecBufferDesc output_desc={SECBUFFER_VERSION,1,&wsend_tok}; |
134 | SecBufferDesc input_desc ={SECBUFFER_VERSION,1,&wrecv_tok}; |
135 | unsigned long flags=ISC_REQ_MUTUAL_AUTH|ISC_REQ_REPLAY_DETECT| |
136 | ISC_REQ_CONFIDENTIALITY|ISC_REQ_ALLOCATE_MEMORY; |
137 | unsigned long ret_flags=0; |
138 | |
139 | /* check if we have to delegate ... */ |
140 | if (to_deleg) flags |= ISC_REQ_DELEGATE; |
141 | winctx->maj_stat = p_InitializeSecurityContextA(&winctx->cred_handle, |
142 | winctx->context_handle, |
143 | (char*) srv_name, |
144 | flags, |
145 | 0, /* reserved */ |
146 | SECURITY_NATIVE_DREP, |
147 | &input_desc, |
148 | 0, /* reserved */ |
149 | &winctx->context, |
150 | &output_desc, |
151 | &ret_flags, |
152 | &winctx->expiry); |
153 | |
154 | /* prepare for the next round */ |
155 | winctx->context_handle = &winctx->context; |
156 | send_tok->data = (char*) wsend_tok.pvBuffer; |
157 | send_tok->len = wsend_tok.cbBuffer; |
158 | |
159 | /* check & return our status */ |
160 | if (winctx->maj_stat==SEC_E_OK) return SSH_GSS_S_COMPLETE; |
161 | if (winctx->maj_stat==SEC_I_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED; |
162 | |
163 | return SSH_GSS_FAILURE; |
164 | } |
165 | |
166 | Ssh_gss_stat ssh_gss_free_tok(Ssh_gss_buf *send_tok) |
167 | { |
168 | /* check input */ |
169 | if (send_tok == NULL) return SSH_GSS_FAILURE; |
170 | |
171 | /* free Windows buffer */ |
172 | p_FreeContextBuffer(send_tok->data); |
173 | send_tok->len = 0; send_tok->data = NULL; |
174 | |
175 | return SSH_GSS_OK; |
176 | } |
177 | |
178 | Ssh_gss_stat ssh_gss_release_cred(Ssh_gss_ctx *ctx) |
179 | { |
180 | winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) *ctx; |
181 | |
182 | /* check input */ |
183 | if (winctx == NULL) return SSH_GSS_FAILURE; |
184 | |
185 | /* free Windows data */ |
186 | p_FreeCredentialsHandle(&winctx->cred_handle); |
187 | p_DeleteSecurityContext(&winctx->context); |
188 | |
189 | /* delete our "wrapper" structure */ |
190 | sfree(winctx); |
191 | *ctx = (Ssh_gss_ctx) NULL; |
192 | |
193 | return SSH_GSS_OK; |
194 | } |
195 | |
196 | |
197 | Ssh_gss_stat ssh_gss_release_name(Ssh_gss_name *srv_name) |
198 | { |
199 | char *pStr= (char *) *srv_name; |
200 | |
201 | if (pStr == NULL) return SSH_GSS_FAILURE; |
202 | sfree(pStr); |
203 | *srv_name = (Ssh_gss_name) NULL; |
204 | |
205 | return SSH_GSS_OK; |
206 | } |
207 | |
208 | Ssh_gss_stat ssh_gss_display_status(Ssh_gss_ctx ctx, Ssh_gss_buf *buf) |
209 | { |
210 | winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) ctx; |
211 | char *msg; |
212 | |
213 | if (winctx == NULL) return SSH_GSS_FAILURE; |
214 | |
215 | /* decode the error code */ |
216 | switch (winctx->maj_stat) { |
217 | case SEC_E_OK: msg="SSPI status OK"; break; |
218 | case SEC_E_INVALID_HANDLE: msg="The handle passed to the function" |
219 | " is invalid."; |
220 | break; |
221 | case SEC_E_TARGET_UNKNOWN: msg="The target was not recognized."; break; |
222 | case SEC_E_LOGON_DENIED: msg="The logon failed."; break; |
223 | case SEC_E_INTERNAL_ERROR: msg="The Local Security Authority cannot" |
224 | " be contacted."; |
225 | break; |
226 | case SEC_E_NO_CREDENTIALS: msg="No credentials are available in the" |
227 | " security package."; |
228 | break; |
229 | case SEC_E_NO_AUTHENTICATING_AUTHORITY: |
230 | msg="No authority could be contacted for authentication." |
231 | "The domain name of the authenticating party could be wrong," |
232 | " the domain could be unreachable, or there might have been" |
233 | " a trust relationship failure."; |
234 | break; |
235 | case SEC_E_INSUFFICIENT_MEMORY: |
236 | msg="One or more of the SecBufferDesc structures passed as" |
237 | " an OUT parameter has a buffer that is too small."; |
238 | break; |
239 | case SEC_E_INVALID_TOKEN: |
240 | msg="The error is due to a malformed input token, such as a" |
241 | " token corrupted in transit, a token" |
242 | " of incorrect size, or a token passed into the wrong" |
243 | " security package. Passing a token to" |
244 | " the wrong package can happen if client and server did not" |
245 | " negotiate the proper security package."; |
246 | break; |
247 | default: |
248 | msg = "Internal SSPI error"; |
249 | break; |
250 | } |
251 | |
252 | buf->data = dupstr(msg); |
253 | buf->len = strlen(buf->data); |
254 | |
255 | return SSH_GSS_OK; |
256 | } |
257 | |
258 | Ssh_gss_stat ssh_gss_get_mic(Ssh_gss_ctx ctx, Ssh_gss_buf *buf, |
259 | Ssh_gss_buf *hash) |
260 | { |
261 | winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx; |
262 | SecPkgContext_Sizes ContextSizes; |
263 | SecBufferDesc InputBufferDescriptor; |
264 | SecBuffer InputSecurityToken[2]; |
265 | |
266 | if (winctx == NULL) return SSH_GSS_FAILURE; |
267 | |
268 | winctx->maj_stat = 0; |
269 | |
270 | memset(&ContextSizes, 0, sizeof(ContextSizes)); |
271 | |
272 | winctx->maj_stat = p_QueryContextAttributesA(&winctx->context, |
273 | SECPKG_ATTR_SIZES, |
274 | &ContextSizes); |
275 | |
276 | if (winctx->maj_stat != SEC_E_OK || |
277 | ContextSizes.cbMaxSignature == 0) |
278 | return winctx->maj_stat; |
279 | |
280 | InputBufferDescriptor.cBuffers = 2; |
281 | InputBufferDescriptor.pBuffers = InputSecurityToken; |
282 | InputBufferDescriptor.ulVersion = SECBUFFER_VERSION; |
283 | InputSecurityToken[0].BufferType = SECBUFFER_DATA; |
284 | InputSecurityToken[0].cbBuffer = buf->len; |
285 | InputSecurityToken[0].pvBuffer = buf->data; |
286 | InputSecurityToken[1].BufferType = SECBUFFER_TOKEN; |
287 | InputSecurityToken[1].cbBuffer = ContextSizes.cbMaxSignature; |
288 | InputSecurityToken[1].pvBuffer = snewn(ContextSizes.cbMaxSignature, char); |
289 | |
290 | winctx->maj_stat = p_MakeSignature(&winctx->context, |
291 | 0, |
292 | &InputBufferDescriptor, |
293 | 0); |
294 | |
295 | if (winctx->maj_stat == SEC_E_OK) { |
296 | hash->len = InputSecurityToken[1].cbBuffer; |
297 | hash->data = InputSecurityToken[1].pvBuffer; |
298 | } |
299 | |
300 | return winctx->maj_stat; |
301 | } |
302 | |
303 | Ssh_gss_stat ssh_gss_free_mic(Ssh_gss_buf *hash) |
304 | { |
305 | sfree(hash->data); |
306 | return SSH_GSS_OK; |
307 | } |
308 | |
309 | #else |
310 | |
311 | /* Dummy function so this source file defines something if NO_GSSAPI |
312 | is defined. */ |
313 | |
314 | int ssh_gss_init(void) |
315 | { |
316 | return 0; |
317 | } |
318 | |
319 | #endif |