| 1 | #ifndef NO_GSSAPI |
| 2 | |
| 3 | #include "putty.h" |
| 4 | |
| 5 | #define SECURITY_WIN32 |
| 6 | #include <security.h> |
| 7 | |
| 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); |
| 101 | memset(winctx, 0, sizeof(winSsh_gss_ctx)); |
| 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; |
| 134 | SecBuffer wsend_tok = {send_tok->length,SECBUFFER_TOKEN,send_tok->value}; |
| 135 | SecBuffer wrecv_tok = {recv_tok->length,SECBUFFER_TOKEN,recv_tok->value}; |
| 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; |
| 159 | send_tok->value = wsend_tok.pvBuffer; |
| 160 | send_tok->length = wsend_tok.cbBuffer; |
| 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 */ |
| 175 | p_FreeContextBuffer(send_tok->value); |
| 176 | SSH_GSS_CLEAR_BUF(send_tok); |
| 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 | |
| 255 | buf->value = dupstr(msg); |
| 256 | buf->length = strlen(buf->length); |
| 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; |
| 287 | InputSecurityToken[0].cbBuffer = buf->length; |
| 288 | InputSecurityToken[0].pvBuffer = buf->value; |
| 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) { |
| 299 | hash->length = InputSecurityToken[1].cbBuffer; |
| 300 | hash->value = InputSecurityToken[1].pvBuffer; |
| 301 | } |
| 302 | |
| 303 | return winctx->maj_stat; |
| 304 | } |
| 305 | |
| 306 | Ssh_gss_stat ssh_gss_free_mic(Ssh_gss_buf *hash) |
| 307 | { |
| 308 | sfree(hash->value); |
| 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 |