| 1 | #ifndef NO_GSSAPI |
| 2 | |
| 3 | #include "putty.h" |
| 4 | |
| 5 | #include <security.h> |
| 6 | |
| 7 | #include "pgssapi.h" |
| 8 | #include "sshgss.h" |
| 9 | #include "sshgssc.h" |
| 10 | |
| 11 | #include "misc.h" |
| 12 | |
| 13 | /* Windows code to set up the GSSAPI library list. */ |
| 14 | |
| 15 | struct ssh_gss_library ssh_gss_libraries[2]; |
| 16 | int n_ssh_gss_libraries = 0; |
| 17 | static int initialised = FALSE; |
| 18 | |
| 19 | const int ngsslibs = 2; |
| 20 | const char *const gsslibnames[2] = { |
| 21 | "GSSAPI32.DLL (MIT Kerberos)", |
| 22 | "SSPI.DLL (Microsoft SSPI)", |
| 23 | }; |
| 24 | const struct keyval gsslibkeywords[] = { |
| 25 | { "gssapi32", 0 }, |
| 26 | { "sspi", 1 }, |
| 27 | }; |
| 28 | |
| 29 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 30 | AcquireCredentialsHandleA, |
| 31 | (SEC_CHAR *, SEC_CHAR *, ULONG, PLUID, |
| 32 | PVOID, SEC_GET_KEY_FN, PVOID, PCredHandle, PTimeStamp)); |
| 33 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 34 | InitializeSecurityContextA, |
| 35 | (PCredHandle, PCtxtHandle, SEC_CHAR *, ULONG, ULONG, |
| 36 | ULONG, PSecBufferDesc, ULONG, PCtxtHandle, |
| 37 | PSecBufferDesc, PULONG, PTimeStamp)); |
| 38 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 39 | FreeContextBuffer, |
| 40 | (PVOID)); |
| 41 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 42 | FreeCredentialsHandle, |
| 43 | (PCredHandle)); |
| 44 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 45 | DeleteSecurityContext, |
| 46 | (PCtxtHandle)); |
| 47 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 48 | QueryContextAttributesA, |
| 49 | (PCtxtHandle, ULONG, PVOID)); |
| 50 | DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS, |
| 51 | MakeSignature, |
| 52 | (PCtxtHandle, ULONG, PSecBufferDesc, ULONG)); |
| 53 | |
| 54 | typedef struct winSsh_gss_ctx { |
| 55 | unsigned long maj_stat; |
| 56 | unsigned long min_stat; |
| 57 | CredHandle cred_handle; |
| 58 | CtxtHandle context; |
| 59 | PCtxtHandle context_handle; |
| 60 | TimeStamp expiry; |
| 61 | } winSsh_gss_ctx; |
| 62 | |
| 63 | |
| 64 | const Ssh_gss_buf gss_mech_krb5={9,"\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}; |
| 65 | |
| 66 | const char *gsslogmsg = NULL; |
| 67 | |
| 68 | static void ssh_sspi_bind_fns(struct ssh_gss_library *lib); |
| 69 | |
| 70 | void ssh_gss_init(void) |
| 71 | { |
| 72 | HMODULE module; |
| 73 | |
| 74 | if (initialised) return; |
| 75 | initialised = TRUE; |
| 76 | |
| 77 | /* MIT Kerberos GSSAPI implementation */ |
| 78 | /* TODO: For 64-bit builds, check for gssapi64.dll */ |
| 79 | module = LoadLibrary("gssapi32.dll"); |
| 80 | if (module) { |
| 81 | struct ssh_gss_library *lib = |
| 82 | &ssh_gss_libraries[n_ssh_gss_libraries++]; |
| 83 | |
| 84 | lib->id = 0; |
| 85 | lib->gsslogmsg = "Using GSSAPI from GSSAPI32.DLL"; |
| 86 | |
| 87 | #define BIND_GSS_FN(name) \ |
| 88 | lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name) |
| 89 | |
| 90 | BIND_GSS_FN(delete_sec_context); |
| 91 | BIND_GSS_FN(display_status); |
| 92 | BIND_GSS_FN(get_mic); |
| 93 | BIND_GSS_FN(import_name); |
| 94 | BIND_GSS_FN(init_sec_context); |
| 95 | BIND_GSS_FN(release_buffer); |
| 96 | BIND_GSS_FN(release_cred); |
| 97 | BIND_GSS_FN(release_name); |
| 98 | |
| 99 | #undef BIND_GSS_FN |
| 100 | |
| 101 | ssh_gssapi_bind_fns(lib); |
| 102 | } |
| 103 | |
| 104 | /* Microsoft SSPI Implementation */ |
| 105 | module = load_system32_dll("secur32.dll"); |
| 106 | if (module) { |
| 107 | struct ssh_gss_library *lib = |
| 108 | &ssh_gss_libraries[n_ssh_gss_libraries++]; |
| 109 | |
| 110 | lib->id = 1; |
| 111 | lib->gsslogmsg = "Using SSPI from SECUR32.DLL"; |
| 112 | |
| 113 | GET_WINDOWS_FUNCTION(module, AcquireCredentialsHandleA); |
| 114 | GET_WINDOWS_FUNCTION(module, InitializeSecurityContextA); |
| 115 | GET_WINDOWS_FUNCTION(module, FreeContextBuffer); |
| 116 | GET_WINDOWS_FUNCTION(module, FreeCredentialsHandle); |
| 117 | GET_WINDOWS_FUNCTION(module, DeleteSecurityContext); |
| 118 | GET_WINDOWS_FUNCTION(module, QueryContextAttributesA); |
| 119 | GET_WINDOWS_FUNCTION(module, MakeSignature); |
| 120 | |
| 121 | ssh_sspi_bind_fns(lib); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | static Ssh_gss_stat ssh_sspi_indicate_mech(struct ssh_gss_library *lib, |
| 126 | Ssh_gss_buf *mech) |
| 127 | { |
| 128 | *mech = gss_mech_krb5; |
| 129 | return SSH_GSS_OK; |
| 130 | } |
| 131 | |
| 132 | |
| 133 | static Ssh_gss_stat ssh_sspi_import_name(struct ssh_gss_library *lib, |
| 134 | char *host, Ssh_gss_name *srv_name) |
| 135 | { |
| 136 | char *pStr; |
| 137 | |
| 138 | /* Check hostname */ |
| 139 | if (host == NULL) return SSH_GSS_FAILURE; |
| 140 | |
| 141 | /* copy it into form host/FQDN */ |
| 142 | pStr = dupcat("host/", host, NULL); |
| 143 | |
| 144 | *srv_name = (Ssh_gss_name) pStr; |
| 145 | |
| 146 | return SSH_GSS_OK; |
| 147 | } |
| 148 | |
| 149 | static Ssh_gss_stat ssh_sspi_acquire_cred(struct ssh_gss_library *lib, |
| 150 | Ssh_gss_ctx *ctx) |
| 151 | { |
| 152 | winSsh_gss_ctx *winctx = snew(winSsh_gss_ctx); |
| 153 | memset(winctx, 0, sizeof(winSsh_gss_ctx)); |
| 154 | |
| 155 | /* prepare our "wrapper" structure */ |
| 156 | winctx->maj_stat = winctx->min_stat = SEC_E_OK; |
| 157 | winctx->context_handle = NULL; |
| 158 | |
| 159 | /* Specifying no principal name here means use the credentials of |
| 160 | the current logged-in user */ |
| 161 | |
| 162 | winctx->maj_stat = p_AcquireCredentialsHandleA(NULL, |
| 163 | "Kerberos", |
| 164 | SECPKG_CRED_OUTBOUND, |
| 165 | NULL, |
| 166 | NULL, |
| 167 | NULL, |
| 168 | NULL, |
| 169 | &winctx->cred_handle, |
| 170 | &winctx->expiry); |
| 171 | |
| 172 | if (winctx->maj_stat != SEC_E_OK) return SSH_GSS_FAILURE; |
| 173 | |
| 174 | *ctx = (Ssh_gss_ctx) winctx; |
| 175 | return SSH_GSS_OK; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | static Ssh_gss_stat ssh_sspi_init_sec_context(struct ssh_gss_library *lib, |
| 180 | Ssh_gss_ctx *ctx, |
| 181 | Ssh_gss_name srv_name, |
| 182 | int to_deleg, |
| 183 | Ssh_gss_buf *recv_tok, |
| 184 | Ssh_gss_buf *send_tok) |
| 185 | { |
| 186 | winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) *ctx; |
| 187 | SecBuffer wsend_tok = {send_tok->length,SECBUFFER_TOKEN,send_tok->value}; |
| 188 | SecBuffer wrecv_tok = {recv_tok->length,SECBUFFER_TOKEN,recv_tok->value}; |
| 189 | SecBufferDesc output_desc={SECBUFFER_VERSION,1,&wsend_tok}; |
| 190 | SecBufferDesc input_desc ={SECBUFFER_VERSION,1,&wrecv_tok}; |
| 191 | unsigned long flags=ISC_REQ_MUTUAL_AUTH|ISC_REQ_REPLAY_DETECT| |
| 192 | ISC_REQ_CONFIDENTIALITY|ISC_REQ_ALLOCATE_MEMORY; |
| 193 | unsigned long ret_flags=0; |
| 194 | |
| 195 | /* check if we have to delegate ... */ |
| 196 | if (to_deleg) flags |= ISC_REQ_DELEGATE; |
| 197 | winctx->maj_stat = p_InitializeSecurityContextA(&winctx->cred_handle, |
| 198 | winctx->context_handle, |
| 199 | (char*) srv_name, |
| 200 | flags, |
| 201 | 0, /* reserved */ |
| 202 | SECURITY_NATIVE_DREP, |
| 203 | &input_desc, |
| 204 | 0, /* reserved */ |
| 205 | &winctx->context, |
| 206 | &output_desc, |
| 207 | &ret_flags, |
| 208 | &winctx->expiry); |
| 209 | |
| 210 | /* prepare for the next round */ |
| 211 | winctx->context_handle = &winctx->context; |
| 212 | send_tok->value = wsend_tok.pvBuffer; |
| 213 | send_tok->length = wsend_tok.cbBuffer; |
| 214 | |
| 215 | /* check & return our status */ |
| 216 | if (winctx->maj_stat==SEC_E_OK) return SSH_GSS_S_COMPLETE; |
| 217 | if (winctx->maj_stat==SEC_I_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED; |
| 218 | |
| 219 | return SSH_GSS_FAILURE; |
| 220 | } |
| 221 | |
| 222 | static Ssh_gss_stat ssh_sspi_free_tok(struct ssh_gss_library *lib, |
| 223 | Ssh_gss_buf *send_tok) |
| 224 | { |
| 225 | /* check input */ |
| 226 | if (send_tok == NULL) return SSH_GSS_FAILURE; |
| 227 | |
| 228 | /* free Windows buffer */ |
| 229 | p_FreeContextBuffer(send_tok->value); |
| 230 | SSH_GSS_CLEAR_BUF(send_tok); |
| 231 | |
| 232 | return SSH_GSS_OK; |
| 233 | } |
| 234 | |
| 235 | static Ssh_gss_stat ssh_sspi_release_cred(struct ssh_gss_library *lib, |
| 236 | Ssh_gss_ctx *ctx) |
| 237 | { |
| 238 | winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) *ctx; |
| 239 | |
| 240 | /* check input */ |
| 241 | if (winctx == NULL) return SSH_GSS_FAILURE; |
| 242 | |
| 243 | /* free Windows data */ |
| 244 | p_FreeCredentialsHandle(&winctx->cred_handle); |
| 245 | p_DeleteSecurityContext(&winctx->context); |
| 246 | |
| 247 | /* delete our "wrapper" structure */ |
| 248 | sfree(winctx); |
| 249 | *ctx = (Ssh_gss_ctx) NULL; |
| 250 | |
| 251 | return SSH_GSS_OK; |
| 252 | } |
| 253 | |
| 254 | |
| 255 | static Ssh_gss_stat ssh_sspi_release_name(struct ssh_gss_library *lib, |
| 256 | Ssh_gss_name *srv_name) |
| 257 | { |
| 258 | char *pStr= (char *) *srv_name; |
| 259 | |
| 260 | if (pStr == NULL) return SSH_GSS_FAILURE; |
| 261 | sfree(pStr); |
| 262 | *srv_name = (Ssh_gss_name) NULL; |
| 263 | |
| 264 | return SSH_GSS_OK; |
| 265 | } |
| 266 | |
| 267 | static Ssh_gss_stat ssh_sspi_display_status(struct ssh_gss_library *lib, |
| 268 | Ssh_gss_ctx ctx, Ssh_gss_buf *buf) |
| 269 | { |
| 270 | winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) ctx; |
| 271 | char *msg; |
| 272 | |
| 273 | if (winctx == NULL) return SSH_GSS_FAILURE; |
| 274 | |
| 275 | /* decode the error code */ |
| 276 | switch (winctx->maj_stat) { |
| 277 | case SEC_E_OK: msg="SSPI status OK"; break; |
| 278 | case SEC_E_INVALID_HANDLE: msg="The handle passed to the function" |
| 279 | " is invalid."; |
| 280 | break; |
| 281 | case SEC_E_TARGET_UNKNOWN: msg="The target was not recognized."; break; |
| 282 | case SEC_E_LOGON_DENIED: msg="The logon failed."; break; |
| 283 | case SEC_E_INTERNAL_ERROR: msg="The Local Security Authority cannot" |
| 284 | " be contacted."; |
| 285 | break; |
| 286 | case SEC_E_NO_CREDENTIALS: msg="No credentials are available in the" |
| 287 | " security package."; |
| 288 | break; |
| 289 | case SEC_E_NO_AUTHENTICATING_AUTHORITY: |
| 290 | msg="No authority could be contacted for authentication." |
| 291 | "The domain name of the authenticating party could be wrong," |
| 292 | " the domain could be unreachable, or there might have been" |
| 293 | " a trust relationship failure."; |
| 294 | break; |
| 295 | case SEC_E_INSUFFICIENT_MEMORY: |
| 296 | msg="One or more of the SecBufferDesc structures passed as" |
| 297 | " an OUT parameter has a buffer that is too small."; |
| 298 | break; |
| 299 | case SEC_E_INVALID_TOKEN: |
| 300 | msg="The error is due to a malformed input token, such as a" |
| 301 | " token corrupted in transit, a token" |
| 302 | " of incorrect size, or a token passed into the wrong" |
| 303 | " security package. Passing a token to" |
| 304 | " the wrong package can happen if client and server did not" |
| 305 | " negotiate the proper security package."; |
| 306 | break; |
| 307 | default: |
| 308 | msg = "Internal SSPI error"; |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | buf->value = dupstr(msg); |
| 313 | buf->length = strlen(buf->value); |
| 314 | |
| 315 | return SSH_GSS_OK; |
| 316 | } |
| 317 | |
| 318 | static Ssh_gss_stat ssh_sspi_get_mic(struct ssh_gss_library *lib, |
| 319 | Ssh_gss_ctx ctx, Ssh_gss_buf *buf, |
| 320 | Ssh_gss_buf *hash) |
| 321 | { |
| 322 | winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx; |
| 323 | SecPkgContext_Sizes ContextSizes; |
| 324 | SecBufferDesc InputBufferDescriptor; |
| 325 | SecBuffer InputSecurityToken[2]; |
| 326 | |
| 327 | if (winctx == NULL) return SSH_GSS_FAILURE; |
| 328 | |
| 329 | winctx->maj_stat = 0; |
| 330 | |
| 331 | memset(&ContextSizes, 0, sizeof(ContextSizes)); |
| 332 | |
| 333 | winctx->maj_stat = p_QueryContextAttributesA(&winctx->context, |
| 334 | SECPKG_ATTR_SIZES, |
| 335 | &ContextSizes); |
| 336 | |
| 337 | if (winctx->maj_stat != SEC_E_OK || |
| 338 | ContextSizes.cbMaxSignature == 0) |
| 339 | return winctx->maj_stat; |
| 340 | |
| 341 | InputBufferDescriptor.cBuffers = 2; |
| 342 | InputBufferDescriptor.pBuffers = InputSecurityToken; |
| 343 | InputBufferDescriptor.ulVersion = SECBUFFER_VERSION; |
| 344 | InputSecurityToken[0].BufferType = SECBUFFER_DATA; |
| 345 | InputSecurityToken[0].cbBuffer = buf->length; |
| 346 | InputSecurityToken[0].pvBuffer = buf->value; |
| 347 | InputSecurityToken[1].BufferType = SECBUFFER_TOKEN; |
| 348 | InputSecurityToken[1].cbBuffer = ContextSizes.cbMaxSignature; |
| 349 | InputSecurityToken[1].pvBuffer = snewn(ContextSizes.cbMaxSignature, char); |
| 350 | |
| 351 | winctx->maj_stat = p_MakeSignature(&winctx->context, |
| 352 | 0, |
| 353 | &InputBufferDescriptor, |
| 354 | 0); |
| 355 | |
| 356 | if (winctx->maj_stat == SEC_E_OK) { |
| 357 | hash->length = InputSecurityToken[1].cbBuffer; |
| 358 | hash->value = InputSecurityToken[1].pvBuffer; |
| 359 | } |
| 360 | |
| 361 | return winctx->maj_stat; |
| 362 | } |
| 363 | |
| 364 | static Ssh_gss_stat ssh_sspi_free_mic(struct ssh_gss_library *lib, |
| 365 | Ssh_gss_buf *hash) |
| 366 | { |
| 367 | sfree(hash->value); |
| 368 | return SSH_GSS_OK; |
| 369 | } |
| 370 | |
| 371 | static void ssh_sspi_bind_fns(struct ssh_gss_library *lib) |
| 372 | { |
| 373 | lib->indicate_mech = ssh_sspi_indicate_mech; |
| 374 | lib->import_name = ssh_sspi_import_name; |
| 375 | lib->release_name = ssh_sspi_release_name; |
| 376 | lib->init_sec_context = ssh_sspi_init_sec_context; |
| 377 | lib->free_tok = ssh_sspi_free_tok; |
| 378 | lib->acquire_cred = ssh_sspi_acquire_cred; |
| 379 | lib->release_cred = ssh_sspi_release_cred; |
| 380 | lib->get_mic = ssh_sspi_get_mic; |
| 381 | lib->free_mic = ssh_sspi_free_mic; |
| 382 | lib->display_status = ssh_sspi_display_status; |
| 383 | } |
| 384 | |
| 385 | #else |
| 386 | |
| 387 | /* Dummy function so this source file defines something if NO_GSSAPI |
| 388 | is defined. */ |
| 389 | |
| 390 | void ssh_gss_init(void) |
| 391 | { |
| 392 | } |
| 393 | |
| 394 | #endif |