зеркало из https://github.com/github/putty.git
481 строка
14 KiB
C
481 строка
14 KiB
C
#ifndef NO_GSSAPI
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#include "putty.h"
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#include <security.h>
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#include "pgssapi.h"
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#include "sshgss.h"
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#include "sshgssc.h"
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#include "misc.h"
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/* Windows code to set up the GSSAPI library list. */
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const int ngsslibs = 3;
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const char *const gsslibnames[3] = {
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"MIT Kerberos GSSAPI32.DLL",
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"Microsoft SSPI SECUR32.DLL",
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"User-specified GSSAPI DLL",
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};
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const struct keyvalwhere gsslibkeywords[] = {
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{ "gssapi32", 0, -1, -1 },
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{ "sspi", 1, -1, -1 },
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{ "custom", 2, -1, -1 },
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};
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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AcquireCredentialsHandleA,
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(SEC_CHAR *, SEC_CHAR *, ULONG, PLUID,
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PVOID, SEC_GET_KEY_FN, PVOID, PCredHandle, PTimeStamp));
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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InitializeSecurityContextA,
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(PCredHandle, PCtxtHandle, SEC_CHAR *, ULONG, ULONG,
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ULONG, PSecBufferDesc, ULONG, PCtxtHandle,
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PSecBufferDesc, PULONG, PTimeStamp));
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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FreeContextBuffer,
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(PVOID));
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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FreeCredentialsHandle,
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(PCredHandle));
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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DeleteSecurityContext,
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(PCtxtHandle));
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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QueryContextAttributesA,
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(PCtxtHandle, ULONG, PVOID));
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DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
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MakeSignature,
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(PCtxtHandle, ULONG, PSecBufferDesc, ULONG));
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typedef struct winSsh_gss_ctx {
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unsigned long maj_stat;
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unsigned long min_stat;
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CredHandle cred_handle;
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CtxtHandle context;
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PCtxtHandle context_handle;
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TimeStamp expiry;
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} winSsh_gss_ctx;
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const Ssh_gss_buf gss_mech_krb5={9,"\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"};
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const char *gsslogmsg = NULL;
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static void ssh_sspi_bind_fns(struct ssh_gss_library *lib);
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struct ssh_gss_liblist *ssh_gss_setup(Conf *conf)
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{
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HMODULE module;
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HKEY regkey;
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struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist);
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char *path;
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list->libraries = snewn(3, struct ssh_gss_library);
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list->nlibraries = 0;
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/* MIT Kerberos GSSAPI implementation */
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/* TODO: For 64-bit builds, check for gssapi64.dll */
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module = NULL;
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if (RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\MIT\\Kerberos", ®key)
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== ERROR_SUCCESS) {
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DWORD type, size;
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LONG ret;
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char *buffer;
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/* Find out the string length */
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ret = RegQueryValueEx(regkey, "InstallDir", NULL, &type, NULL, &size);
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if (ret == ERROR_SUCCESS && type == REG_SZ) {
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buffer = snewn(size + 20, char);
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ret = RegQueryValueEx(regkey, "InstallDir", NULL,
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&type, buffer, &size);
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if (ret == ERROR_SUCCESS && type == REG_SZ) {
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strcat(buffer, "\\bin\\gssapi32.dll");
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module = LoadLibrary(buffer);
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}
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sfree(buffer);
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}
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RegCloseKey(regkey);
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}
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if (module) {
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struct ssh_gss_library *lib =
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&list->libraries[list->nlibraries++];
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lib->id = 0;
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lib->gsslogmsg = "Using GSSAPI from GSSAPI32.DLL";
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lib->handle = (void *)module;
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#define BIND_GSS_FN(name) \
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lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name)
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BIND_GSS_FN(delete_sec_context);
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BIND_GSS_FN(display_status);
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BIND_GSS_FN(get_mic);
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BIND_GSS_FN(import_name);
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BIND_GSS_FN(init_sec_context);
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BIND_GSS_FN(release_buffer);
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BIND_GSS_FN(release_cred);
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BIND_GSS_FN(release_name);
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#undef BIND_GSS_FN
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ssh_gssapi_bind_fns(lib);
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}
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/* Microsoft SSPI Implementation */
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module = load_system32_dll("secur32.dll");
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if (module) {
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struct ssh_gss_library *lib =
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&list->libraries[list->nlibraries++];
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lib->id = 1;
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lib->gsslogmsg = "Using SSPI from SECUR32.DLL";
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lib->handle = (void *)module;
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GET_WINDOWS_FUNCTION(module, AcquireCredentialsHandleA);
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GET_WINDOWS_FUNCTION(module, InitializeSecurityContextA);
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GET_WINDOWS_FUNCTION(module, FreeContextBuffer);
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GET_WINDOWS_FUNCTION(module, FreeCredentialsHandle);
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GET_WINDOWS_FUNCTION(module, DeleteSecurityContext);
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GET_WINDOWS_FUNCTION(module, QueryContextAttributesA);
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GET_WINDOWS_FUNCTION(module, MakeSignature);
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ssh_sspi_bind_fns(lib);
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}
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/*
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* Custom GSSAPI DLL.
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*/
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module = NULL;
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path = conf_get_filename(conf, CONF_ssh_gss_custom)->path;
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if (*path) {
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module = LoadLibrary(path);
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}
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if (module) {
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struct ssh_gss_library *lib =
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&list->libraries[list->nlibraries++];
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lib->id = 2;
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lib->gsslogmsg = dupprintf("Using GSSAPI from user-specified"
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" library '%s'", path);
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lib->handle = (void *)module;
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#define BIND_GSS_FN(name) \
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lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name)
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BIND_GSS_FN(delete_sec_context);
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BIND_GSS_FN(display_status);
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BIND_GSS_FN(get_mic);
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BIND_GSS_FN(import_name);
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BIND_GSS_FN(init_sec_context);
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BIND_GSS_FN(release_buffer);
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BIND_GSS_FN(release_cred);
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BIND_GSS_FN(release_name);
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#undef BIND_GSS_FN
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ssh_gssapi_bind_fns(lib);
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}
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return list;
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}
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void ssh_gss_cleanup(struct ssh_gss_liblist *list)
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{
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int i;
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/*
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* LoadLibrary and FreeLibrary are defined to employ reference
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* counting in the case where the same library is repeatedly
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* loaded, so even in a multiple-sessions-per-process context
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* (not that we currently expect ever to have such a thing on
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* Windows) it's safe to naively FreeLibrary everything here
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* without worrying about destroying it under the feet of
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* another SSH instance still using it.
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*/
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for (i = 0; i < list->nlibraries; i++) {
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FreeLibrary((HMODULE)list->libraries[i].handle);
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if (list->libraries[i].id == 2) {
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/* The 'custom' id involves a dynamically allocated message.
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* Note that we must cast away the 'const' to free it. */
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sfree((char *)list->libraries[i].gsslogmsg);
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}
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}
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sfree(list->libraries);
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sfree(list);
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}
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static Ssh_gss_stat ssh_sspi_indicate_mech(struct ssh_gss_library *lib,
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Ssh_gss_buf *mech)
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{
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*mech = gss_mech_krb5;
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_import_name(struct ssh_gss_library *lib,
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char *host, Ssh_gss_name *srv_name)
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{
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char *pStr;
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/* Check hostname */
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if (host == NULL) return SSH_GSS_FAILURE;
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/* copy it into form host/FQDN */
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pStr = dupcat("host/", host, NULL);
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*srv_name = (Ssh_gss_name) pStr;
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_acquire_cred(struct ssh_gss_library *lib,
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Ssh_gss_ctx *ctx)
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{
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winSsh_gss_ctx *winctx = snew(winSsh_gss_ctx);
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memset(winctx, 0, sizeof(winSsh_gss_ctx));
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/* prepare our "wrapper" structure */
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winctx->maj_stat = winctx->min_stat = SEC_E_OK;
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winctx->context_handle = NULL;
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/* Specifying no principal name here means use the credentials of
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the current logged-in user */
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winctx->maj_stat = p_AcquireCredentialsHandleA(NULL,
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"Kerberos",
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SECPKG_CRED_OUTBOUND,
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NULL,
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NULL,
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NULL,
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NULL,
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&winctx->cred_handle,
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&winctx->expiry);
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if (winctx->maj_stat != SEC_E_OK) return SSH_GSS_FAILURE;
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*ctx = (Ssh_gss_ctx) winctx;
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_init_sec_context(struct ssh_gss_library *lib,
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Ssh_gss_ctx *ctx,
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Ssh_gss_name srv_name,
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int to_deleg,
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Ssh_gss_buf *recv_tok,
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Ssh_gss_buf *send_tok)
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{
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winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) *ctx;
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SecBuffer wsend_tok = {send_tok->length,SECBUFFER_TOKEN,send_tok->value};
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SecBuffer wrecv_tok = {recv_tok->length,SECBUFFER_TOKEN,recv_tok->value};
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SecBufferDesc output_desc={SECBUFFER_VERSION,1,&wsend_tok};
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SecBufferDesc input_desc ={SECBUFFER_VERSION,1,&wrecv_tok};
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unsigned long flags=ISC_REQ_MUTUAL_AUTH|ISC_REQ_REPLAY_DETECT|
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ISC_REQ_CONFIDENTIALITY|ISC_REQ_ALLOCATE_MEMORY;
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unsigned long ret_flags=0;
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/* check if we have to delegate ... */
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if (to_deleg) flags |= ISC_REQ_DELEGATE;
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winctx->maj_stat = p_InitializeSecurityContextA(&winctx->cred_handle,
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winctx->context_handle,
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(char*) srv_name,
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flags,
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0, /* reserved */
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SECURITY_NATIVE_DREP,
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&input_desc,
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0, /* reserved */
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&winctx->context,
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&output_desc,
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&ret_flags,
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&winctx->expiry);
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/* prepare for the next round */
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winctx->context_handle = &winctx->context;
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send_tok->value = wsend_tok.pvBuffer;
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send_tok->length = wsend_tok.cbBuffer;
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/* check & return our status */
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if (winctx->maj_stat==SEC_E_OK) return SSH_GSS_S_COMPLETE;
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if (winctx->maj_stat==SEC_I_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED;
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return SSH_GSS_FAILURE;
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}
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static Ssh_gss_stat ssh_sspi_free_tok(struct ssh_gss_library *lib,
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Ssh_gss_buf *send_tok)
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{
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/* check input */
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if (send_tok == NULL) return SSH_GSS_FAILURE;
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/* free Windows buffer */
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p_FreeContextBuffer(send_tok->value);
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SSH_GSS_CLEAR_BUF(send_tok);
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_release_cred(struct ssh_gss_library *lib,
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Ssh_gss_ctx *ctx)
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{
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winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) *ctx;
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/* check input */
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if (winctx == NULL) return SSH_GSS_FAILURE;
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/* free Windows data */
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p_FreeCredentialsHandle(&winctx->cred_handle);
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p_DeleteSecurityContext(&winctx->context);
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/* delete our "wrapper" structure */
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sfree(winctx);
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*ctx = (Ssh_gss_ctx) NULL;
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_release_name(struct ssh_gss_library *lib,
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Ssh_gss_name *srv_name)
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{
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char *pStr= (char *) *srv_name;
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if (pStr == NULL) return SSH_GSS_FAILURE;
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sfree(pStr);
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*srv_name = (Ssh_gss_name) NULL;
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_display_status(struct ssh_gss_library *lib,
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Ssh_gss_ctx ctx, Ssh_gss_buf *buf)
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{
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winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) ctx;
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char *msg;
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if (winctx == NULL) return SSH_GSS_FAILURE;
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/* decode the error code */
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switch (winctx->maj_stat) {
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case SEC_E_OK: msg="SSPI status OK"; break;
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case SEC_E_INVALID_HANDLE: msg="The handle passed to the function"
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" is invalid.";
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break;
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case SEC_E_TARGET_UNKNOWN: msg="The target was not recognized."; break;
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case SEC_E_LOGON_DENIED: msg="The logon failed."; break;
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case SEC_E_INTERNAL_ERROR: msg="The Local Security Authority cannot"
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" be contacted.";
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break;
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case SEC_E_NO_CREDENTIALS: msg="No credentials are available in the"
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" security package.";
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break;
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case SEC_E_NO_AUTHENTICATING_AUTHORITY:
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msg="No authority could be contacted for authentication."
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"The domain name of the authenticating party could be wrong,"
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" the domain could be unreachable, or there might have been"
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" a trust relationship failure.";
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break;
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case SEC_E_INSUFFICIENT_MEMORY:
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msg="One or more of the SecBufferDesc structures passed as"
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" an OUT parameter has a buffer that is too small.";
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break;
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case SEC_E_INVALID_TOKEN:
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msg="The error is due to a malformed input token, such as a"
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" token corrupted in transit, a token"
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" of incorrect size, or a token passed into the wrong"
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" security package. Passing a token to"
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" the wrong package can happen if client and server did not"
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" negotiate the proper security package.";
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break;
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default:
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msg = "Internal SSPI error";
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break;
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}
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buf->value = dupstr(msg);
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buf->length = strlen(buf->value);
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return SSH_GSS_OK;
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}
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static Ssh_gss_stat ssh_sspi_get_mic(struct ssh_gss_library *lib,
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Ssh_gss_ctx ctx, Ssh_gss_buf *buf,
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Ssh_gss_buf *hash)
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{
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winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx;
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SecPkgContext_Sizes ContextSizes;
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SecBufferDesc InputBufferDescriptor;
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SecBuffer InputSecurityToken[2];
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if (winctx == NULL) return SSH_GSS_FAILURE;
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winctx->maj_stat = 0;
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memset(&ContextSizes, 0, sizeof(ContextSizes));
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winctx->maj_stat = p_QueryContextAttributesA(&winctx->context,
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SECPKG_ATTR_SIZES,
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&ContextSizes);
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if (winctx->maj_stat != SEC_E_OK ||
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ContextSizes.cbMaxSignature == 0)
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return winctx->maj_stat;
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InputBufferDescriptor.cBuffers = 2;
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InputBufferDescriptor.pBuffers = InputSecurityToken;
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InputBufferDescriptor.ulVersion = SECBUFFER_VERSION;
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InputSecurityToken[0].BufferType = SECBUFFER_DATA;
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InputSecurityToken[0].cbBuffer = buf->length;
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InputSecurityToken[0].pvBuffer = buf->value;
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InputSecurityToken[1].BufferType = SECBUFFER_TOKEN;
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InputSecurityToken[1].cbBuffer = ContextSizes.cbMaxSignature;
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InputSecurityToken[1].pvBuffer = snewn(ContextSizes.cbMaxSignature, char);
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winctx->maj_stat = p_MakeSignature(&winctx->context,
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0,
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&InputBufferDescriptor,
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0);
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if (winctx->maj_stat == SEC_E_OK) {
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hash->length = InputSecurityToken[1].cbBuffer;
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hash->value = InputSecurityToken[1].pvBuffer;
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}
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return winctx->maj_stat;
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}
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static Ssh_gss_stat ssh_sspi_free_mic(struct ssh_gss_library *lib,
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Ssh_gss_buf *hash)
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{
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sfree(hash->value);
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return SSH_GSS_OK;
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}
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static void ssh_sspi_bind_fns(struct ssh_gss_library *lib)
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{
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lib->indicate_mech = ssh_sspi_indicate_mech;
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lib->import_name = ssh_sspi_import_name;
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lib->release_name = ssh_sspi_release_name;
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lib->init_sec_context = ssh_sspi_init_sec_context;
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lib->free_tok = ssh_sspi_free_tok;
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lib->acquire_cred = ssh_sspi_acquire_cred;
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lib->release_cred = ssh_sspi_release_cred;
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lib->get_mic = ssh_sspi_get_mic;
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lib->free_mic = ssh_sspi_free_mic;
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lib->display_status = ssh_sspi_display_status;
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}
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#else
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/* Dummy function so this source file defines something if NO_GSSAPI
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is defined. */
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void ssh_gss_init(void)
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{
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}
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#endif
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