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putty-source/windows/gss.c
Simon Tatham 058e390ab5 Avoid crash in MIT Kerberos for Windows on session restart. 
A user reports that if you have MIT KfW loaded, and your PuTTY session
terminates without the PuTTY process exiting, and you select 'Restart
Session' from the menu, then a crash occurs inside the Kerberos
library itself. Scuttlebutt on the Internet suggested this might be to
do with unloading and then reloading the DLL within the process
lifetime, which indeed we were doing.

Now we avoid doing that for the KfW library in particular, by keeping
a tree234 of module handles marked 'never unload this'.

This is a workaround at best, but it seems to stop the problem
happening in my own tests.
2021-07-01 18:59:44 +01:00

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#ifndef NO_GSSAPI
#include <limits.h>
#include "putty.h"
#define SECURITY_WIN32
#include <security.h>
#include "ssh/pgssapi.h"
#include "ssh/gss.h"
#include "ssh/gssc.h"
#include "misc.h"
#define UNIX_EPOCH 11644473600ULL /* Seconds from Windows epoch */
#define CNS_PERSEC 10000000ULL /* # 100ns per second */
/*
* Note, as a special case, 0 relative to the Windows epoch (unspecified) maps
* to 0 relative to the POSIX epoch (unspecified)!
*/
#define TIME_WIN_TO_POSIX(ft, t) do { \
ULARGE_INTEGER uli; \
uli.LowPart = (ft).dwLowDateTime; \
uli.HighPart = (ft).dwHighDateTime; \
if (uli.QuadPart != 0) \
uli.QuadPart = uli.QuadPart / CNS_PERSEC - UNIX_EPOCH; \
(t) = (time_t) uli.QuadPart; \
} while(0)
/* Windows code to set up the GSSAPI library list. */
#ifdef _WIN64
#define MIT_KERB_SUFFIX "64"
#else
#define MIT_KERB_SUFFIX "32"
#endif
const int ngsslibs = 3;
const char *const gsslibnames[3] = {
"MIT Kerberos GSSAPI"MIT_KERB_SUFFIX".DLL",
"Microsoft SSPI SECUR32.DLL",
"User-specified GSSAPI DLL",
};
const struct keyvalwhere gsslibkeywords[] = {
{ "gssapi32", 0, -1, -1 },
{ "sspi", 1, -1, -1 },
{ "custom", 2, -1, -1 },
};
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
AcquireCredentialsHandleA,
(SEC_CHAR *, SEC_CHAR *, ULONG, PVOID,
PVOID, SEC_GET_KEY_FN, PVOID, PCredHandle, PTimeStamp));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
InitializeSecurityContextA,
(PCredHandle, PCtxtHandle, SEC_CHAR *, ULONG, ULONG,
ULONG, PSecBufferDesc, ULONG, PCtxtHandle,
PSecBufferDesc, PULONG, PTimeStamp));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
FreeContextBuffer,
(PVOID));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
FreeCredentialsHandle,
(PCredHandle));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
DeleteSecurityContext,
(PCtxtHandle));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
QueryContextAttributesA,
(PCtxtHandle, ULONG, PVOID));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
MakeSignature,
(PCtxtHandle, ULONG, PSecBufferDesc, ULONG));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
VerifySignature,
(PCtxtHandle, PSecBufferDesc, ULONG, PULONG));
DECL_WINDOWS_FUNCTION(static, DLL_DIRECTORY_COOKIE,
AddDllDirectory,
(PCWSTR));
typedef struct winSsh_gss_ctx {
unsigned long maj_stat;
unsigned long min_stat;
CredHandle cred_handle;
CtxtHandle context;
PCtxtHandle context_handle;
TimeStamp expiry;
} winSsh_gss_ctx;
const Ssh_gss_buf gss_mech_krb5={9,"\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"};
const char *gsslogmsg = NULL;
static void ssh_sspi_bind_fns(struct ssh_gss_library *lib);
static tree234 *libraries_to_never_unload;
static int library_to_never_unload_cmp(void *av, void *bv)
{
uintptr_t a = (uintptr_t)av, b = (uintptr_t)bv;
return a < b ? -1 : a > b ? +1 : 0;
}
static void ensure_library_tree_exists(void)
{
if (!libraries_to_never_unload)
libraries_to_never_unload = newtree234(library_to_never_unload_cmp);
}
static bool library_is_in_never_unload_tree(HMODULE module)
{
ensure_library_tree_exists();
return find234(libraries_to_never_unload, module, NULL);
}
static void add_library_to_never_unload_tree(HMODULE module)
{
ensure_library_tree_exists();
add234(libraries_to_never_unload, module);
}
struct ssh_gss_liblist *ssh_gss_setup(Conf *conf)
{
HMODULE module;
HKEY regkey;
struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist);
char *path;
static HMODULE kernel32_module;
if (!kernel32_module) {
kernel32_module = load_system32_dll("kernel32.dll");
}
#if !HAVE_ADDDLLDIRECTORY
/* Omit the type-check because older MSVCs don't have this function */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(kernel32_module, AddDllDirectory);
#else
GET_WINDOWS_FUNCTION(kernel32_module, AddDllDirectory);
#endif
list->libraries = snewn(3, struct ssh_gss_library);
list->nlibraries = 0;
/* MIT Kerberos GSSAPI implementation */
module = NULL;
if (RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\MIT\\Kerberos", &regkey)
== ERROR_SUCCESS) {
DWORD type, size;
LONG ret;
char *buffer;
/* Find out the string length */
ret = RegQueryValueEx(regkey, "InstallDir", NULL, &type, NULL, &size);
if (ret == ERROR_SUCCESS && type == REG_SZ) {
buffer = snewn(size + 20, char);
ret = RegQueryValueEx(regkey, "InstallDir", NULL,
&type, (LPBYTE)buffer, &size);
if (ret == ERROR_SUCCESS && type == REG_SZ) {
strcat (buffer, "\\bin");
if(p_AddDllDirectory) {
/* Add MIT Kerberos' path to the DLL search path,
* it loads its own DLLs further down the road */
wchar_t *dllPath =
dup_mb_to_wc(DEFAULT_CODEPAGE, 0, buffer);
p_AddDllDirectory(dllPath);
sfree(dllPath);
}
strcat (buffer, "\\gssapi"MIT_KERB_SUFFIX".dll");
module = LoadLibraryEx (buffer, NULL,
LOAD_LIBRARY_SEARCH_SYSTEM32 |
LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR |
LOAD_LIBRARY_SEARCH_USER_DIRS);
/*
* The MIT Kerberos DLL suffers an internal segfault
* for some reason if you unload and reload one within
* the same process. So, make sure that after we load
* this library, we never free it.
*
* Or rather: after we've loaded it once, if any
* _further_ load returns the same module handle, we
* immediately free it again (to prevent the Windows
* API's internal reference count growing without
* bound). But on the other hand we never free it in
* ssh_gss_cleanup.
*/
if (library_is_in_never_unload_tree(module))
FreeLibrary(module);
add_library_to_never_unload_tree(module);
}
sfree(buffer);
}
RegCloseKey(regkey);
}
if (module) {
struct ssh_gss_library *lib =
&list->libraries[list->nlibraries++];
lib->id = 0;
lib->gsslogmsg = "Using GSSAPI from GSSAPI"MIT_KERB_SUFFIX".DLL";
lib->handle = (void *)module;
#define BIND_GSS_FN(name) \
lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name)
BIND_GSS_FN(delete_sec_context);
BIND_GSS_FN(display_status);
BIND_GSS_FN(get_mic);
BIND_GSS_FN(verify_mic);
BIND_GSS_FN(import_name);
BIND_GSS_FN(init_sec_context);
BIND_GSS_FN(release_buffer);
BIND_GSS_FN(release_cred);
BIND_GSS_FN(release_name);
BIND_GSS_FN(acquire_cred);
BIND_GSS_FN(inquire_cred_by_mech);
#undef BIND_GSS_FN
ssh_gssapi_bind_fns(lib);
}
/* Microsoft SSPI Implementation */
module = load_system32_dll("secur32.dll");
if (module) {
struct ssh_gss_library *lib =
&list->libraries[list->nlibraries++];
lib->id = 1;
lib->gsslogmsg = "Using SSPI from SECUR32.DLL";
lib->handle = (void *)module;
GET_WINDOWS_FUNCTION(module, AcquireCredentialsHandleA);
GET_WINDOWS_FUNCTION(module, InitializeSecurityContextA);
GET_WINDOWS_FUNCTION(module, FreeContextBuffer);
GET_WINDOWS_FUNCTION(module, FreeCredentialsHandle);
GET_WINDOWS_FUNCTION(module, DeleteSecurityContext);
GET_WINDOWS_FUNCTION(module, QueryContextAttributesA);
GET_WINDOWS_FUNCTION(module, MakeSignature);
GET_WINDOWS_FUNCTION(module, VerifySignature);
ssh_sspi_bind_fns(lib);
}
/*
* Custom GSSAPI DLL.
*/
module = NULL;
path = conf_get_filename(conf, CONF_ssh_gss_custom)->path;
if (*path) {
if(p_AddDllDirectory) {
/* Add the custom directory as well in case it chainloads
* some other DLLs (e.g a non-installed MIT Kerberos
* instance) */
int pathlen = strlen(path);
while (pathlen > 0 && path[pathlen-1] != ':' &&
path[pathlen-1] != '\\')
pathlen--;
if (pathlen > 0 && path[pathlen-1] != '\\')
pathlen--;
if (pathlen > 0) {
char *dirpath = dupprintf("%.*s", pathlen, path);
wchar_t *dllPath = dup_mb_to_wc(DEFAULT_CODEPAGE, 0, dirpath);
p_AddDllDirectory(dllPath);
sfree(dllPath);
sfree(dirpath);
}
}
module = LoadLibraryEx(path, NULL,
LOAD_LIBRARY_SEARCH_SYSTEM32 |
LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR |
LOAD_LIBRARY_SEARCH_USER_DIRS);
}
if (module) {
struct ssh_gss_library *lib =
&list->libraries[list->nlibraries++];
lib->id = 2;
lib->gsslogmsg = dupprintf("Using GSSAPI from user-specified"
" library '%s'", path);
lib->handle = (void *)module;
#define BIND_GSS_FN(name) \
lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name)
BIND_GSS_FN(delete_sec_context);
BIND_GSS_FN(display_status);
BIND_GSS_FN(get_mic);
BIND_GSS_FN(verify_mic);
BIND_GSS_FN(import_name);
BIND_GSS_FN(init_sec_context);
BIND_GSS_FN(release_buffer);
BIND_GSS_FN(release_cred);
BIND_GSS_FN(release_name);
BIND_GSS_FN(acquire_cred);
BIND_GSS_FN(inquire_cred_by_mech);
#undef BIND_GSS_FN
ssh_gssapi_bind_fns(lib);
}
return list;
}
void ssh_gss_cleanup(struct ssh_gss_liblist *list)
{
int i;
/*
* LoadLibrary and FreeLibrary are defined to employ reference
* counting in the case where the same library is repeatedly
* loaded, so even in a multiple-sessions-per-process context
* (not that we currently expect ever to have such a thing on
* Windows) it's safe to naively FreeLibrary everything here
* without worrying about destroying it under the feet of
* another SSH instance still using it.
*/
for (i = 0; i < list->nlibraries; i++) {
if (list->libraries[i].id != 0) {
HMODULE module = (HMODULE)list->libraries[i].handle;
if (!library_is_in_never_unload_tree(module))
FreeLibrary(module);
}
if (list->libraries[i].id == 2) {
/* The 'custom' id involves a dynamically allocated message.
* Note that we must cast away the 'const' to free it. */
sfree((char *)list->libraries[i].gsslogmsg);
}
}
sfree(list->libraries);
sfree(list);
}
static Ssh_gss_stat ssh_sspi_indicate_mech(struct ssh_gss_library *lib,
Ssh_gss_buf *mech)
{
*mech = gss_mech_krb5;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_import_name(struct ssh_gss_library *lib,
char *host, Ssh_gss_name *srv_name)
{
char *pStr;
/* Check hostname */
if (host == NULL) return SSH_GSS_FAILURE;
/* copy it into form host/FQDN */
pStr = dupcat("host/", host);
*srv_name = (Ssh_gss_name) pStr;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_acquire_cred(struct ssh_gss_library *lib,
Ssh_gss_ctx *ctx,
time_t *expiry)
{
winSsh_gss_ctx *winctx = snew(winSsh_gss_ctx);
memset(winctx, 0, sizeof(winSsh_gss_ctx));
/* prepare our "wrapper" structure */
winctx->maj_stat = winctx->min_stat = SEC_E_OK;
winctx->context_handle = NULL;
/* Specifying no principal name here means use the credentials of
the current logged-in user */
winctx->maj_stat = p_AcquireCredentialsHandleA(NULL,
"Kerberos",
SECPKG_CRED_OUTBOUND,
NULL,
NULL,
NULL,
NULL,
&winctx->cred_handle,
NULL);
if (winctx->maj_stat != SEC_E_OK) {
p_FreeCredentialsHandle(&winctx->cred_handle);
sfree(winctx);
return SSH_GSS_FAILURE;
}
/* Windows does not return a valid expiration from AcquireCredentials */
if (expiry)
*expiry = GSS_NO_EXPIRATION;
*ctx = (Ssh_gss_ctx) winctx;
return SSH_GSS_OK;
}
static void localexp_to_exp_lifetime(TimeStamp *localexp,
time_t *expiry, unsigned long *lifetime)
{
FILETIME nowUTC;
FILETIME expUTC;
time_t now;
time_t exp;
time_t delta;
if (!lifetime && !expiry)
return;
GetSystemTimeAsFileTime(&nowUTC);
TIME_WIN_TO_POSIX(nowUTC, now);
if (lifetime)
*lifetime = 0;
if (expiry)
*expiry = GSS_NO_EXPIRATION;
/*
* Type oddity: localexp is a pointer to 'TimeStamp', whereas
* LocalFileTimeToFileTime expects a pointer to FILETIME. However,
* despite having different formal type names from the compiler's
* point of view, these two structures are specified to be
* isomorphic in the MS documentation, so it's legitimate to copy
* between them:
*
* https://msdn.microsoft.com/en-us/library/windows/desktop/aa380511(v=vs.85).aspx
*/
{
FILETIME localexp_ft;
enum { vorpal_sword = 1 / (sizeof(*localexp) == sizeof(localexp_ft)) };
memcpy(&localexp_ft, localexp, sizeof(localexp_ft));
if (!LocalFileTimeToFileTime(&localexp_ft, &expUTC))
return;
}
TIME_WIN_TO_POSIX(expUTC, exp);
delta = exp - now;
if (exp == 0 || delta <= 0)
return;
if (expiry)
*expiry = exp;
if (lifetime) {
if (delta <= ULONG_MAX)
*lifetime = (unsigned long)delta;
else
*lifetime = ULONG_MAX;
}
}
static Ssh_gss_stat ssh_sspi_init_sec_context(struct ssh_gss_library *lib,
Ssh_gss_ctx *ctx,
Ssh_gss_name srv_name,
int to_deleg,
Ssh_gss_buf *recv_tok,
Ssh_gss_buf *send_tok,
time_t *expiry,
unsigned long *lifetime)
{
winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) *ctx;
SecBuffer wsend_tok = {send_tok->length,SECBUFFER_TOKEN,send_tok->value};
SecBuffer wrecv_tok = {recv_tok->length,SECBUFFER_TOKEN,recv_tok->value};
SecBufferDesc output_desc={SECBUFFER_VERSION,1,&wsend_tok};
SecBufferDesc input_desc ={SECBUFFER_VERSION,1,&wrecv_tok};
unsigned long flags=ISC_REQ_MUTUAL_AUTH|ISC_REQ_REPLAY_DETECT|
ISC_REQ_CONFIDENTIALITY|ISC_REQ_ALLOCATE_MEMORY;
unsigned long ret_flags=0;
TimeStamp localexp;
/* check if we have to delegate ... */
if (to_deleg) flags |= ISC_REQ_DELEGATE;
winctx->maj_stat = p_InitializeSecurityContextA(&winctx->cred_handle,
winctx->context_handle,
(char*) srv_name,
flags,
0, /* reserved */
SECURITY_NATIVE_DREP,
&input_desc,
0, /* reserved */
&winctx->context,
&output_desc,
&ret_flags,
&localexp);
localexp_to_exp_lifetime(&localexp, expiry, lifetime);
/* prepare for the next round */
winctx->context_handle = &winctx->context;
send_tok->value = wsend_tok.pvBuffer;
send_tok->length = wsend_tok.cbBuffer;
/* check & return our status */
if (winctx->maj_stat==SEC_E_OK) return SSH_GSS_S_COMPLETE;
if (winctx->maj_stat==SEC_I_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED;
return SSH_GSS_FAILURE;
}
static Ssh_gss_stat ssh_sspi_free_tok(struct ssh_gss_library *lib,
Ssh_gss_buf *send_tok)
{
/* check input */
if (send_tok == NULL) return SSH_GSS_FAILURE;
/* free Windows buffer */
p_FreeContextBuffer(send_tok->value);
SSH_GSS_CLEAR_BUF(send_tok);
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_release_cred(struct ssh_gss_library *lib,
Ssh_gss_ctx *ctx)
{
winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) *ctx;
/* check input */
if (winctx == NULL) return SSH_GSS_FAILURE;
/* free Windows data */
p_FreeCredentialsHandle(&winctx->cred_handle);
p_DeleteSecurityContext(&winctx->context);
/* delete our "wrapper" structure */
sfree(winctx);
*ctx = (Ssh_gss_ctx) NULL;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_release_name(struct ssh_gss_library *lib,
Ssh_gss_name *srv_name)
{
char *pStr= (char *) *srv_name;
if (pStr == NULL) return SSH_GSS_FAILURE;
sfree(pStr);
*srv_name = (Ssh_gss_name) NULL;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_display_status(struct ssh_gss_library *lib,
Ssh_gss_ctx ctx, Ssh_gss_buf *buf)
{
winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) ctx;
const char *msg;
if (winctx == NULL) return SSH_GSS_FAILURE;
/* decode the error code */
switch (winctx->maj_stat) {
case SEC_E_OK: msg="SSPI status OK"; break;
case SEC_E_INVALID_HANDLE: msg="The handle passed to the function"
" is invalid.";
break;
case SEC_E_TARGET_UNKNOWN: msg="The target was not recognized."; break;
case SEC_E_LOGON_DENIED: msg="The logon failed."; break;
case SEC_E_INTERNAL_ERROR: msg="The Local Security Authority cannot"
" be contacted.";
break;
case SEC_E_NO_CREDENTIALS: msg="No credentials are available in the"
" security package.";
break;
case SEC_E_NO_AUTHENTICATING_AUTHORITY:
msg="No authority could be contacted for authentication."
"The domain name of the authenticating party could be wrong,"
" the domain could be unreachable, or there might have been"
" a trust relationship failure.";
break;
case SEC_E_INSUFFICIENT_MEMORY:
msg="One or more of the SecBufferDesc structures passed as"
" an OUT parameter has a buffer that is too small.";
break;
case SEC_E_INVALID_TOKEN:
msg="The error is due to a malformed input token, such as a"
" token corrupted in transit, a token"
" of incorrect size, or a token passed into the wrong"
" security package. Passing a token to"
" the wrong package can happen if client and server did not"
" negotiate the proper security package.";
break;
default:
msg = "Internal SSPI error";
break;
}
buf->value = dupstr(msg);
buf->length = strlen(buf->value);
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_get_mic(struct ssh_gss_library *lib,
Ssh_gss_ctx ctx, Ssh_gss_buf *buf,
Ssh_gss_buf *hash)
{
winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx;
SecPkgContext_Sizes ContextSizes;
SecBufferDesc InputBufferDescriptor;
SecBuffer InputSecurityToken[2];
if (winctx == NULL) return SSH_GSS_FAILURE;
winctx->maj_stat = 0;
memset(&ContextSizes, 0, sizeof(ContextSizes));
winctx->maj_stat = p_QueryContextAttributesA(&winctx->context,
SECPKG_ATTR_SIZES,
&ContextSizes);
if (winctx->maj_stat != SEC_E_OK ||
ContextSizes.cbMaxSignature == 0)
return winctx->maj_stat;
InputBufferDescriptor.cBuffers = 2;
InputBufferDescriptor.pBuffers = InputSecurityToken;
InputBufferDescriptor.ulVersion = SECBUFFER_VERSION;
InputSecurityToken[0].BufferType = SECBUFFER_DATA;
InputSecurityToken[0].cbBuffer = buf->length;
InputSecurityToken[0].pvBuffer = buf->value;
InputSecurityToken[1].BufferType = SECBUFFER_TOKEN;
InputSecurityToken[1].cbBuffer = ContextSizes.cbMaxSignature;
InputSecurityToken[1].pvBuffer = snewn(ContextSizes.cbMaxSignature, char);
winctx->maj_stat = p_MakeSignature(&winctx->context,
0,
&InputBufferDescriptor,
0);
if (winctx->maj_stat == SEC_E_OK) {
hash->length = InputSecurityToken[1].cbBuffer;
hash->value = InputSecurityToken[1].pvBuffer;
}
return winctx->maj_stat;
}
static Ssh_gss_stat ssh_sspi_verify_mic(struct ssh_gss_library *lib,
Ssh_gss_ctx ctx,
Ssh_gss_buf *buf,
Ssh_gss_buf *mic)
{
winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx;
SecBufferDesc InputBufferDescriptor;
SecBuffer InputSecurityToken[2];
ULONG qop;
if (winctx == NULL) return SSH_GSS_FAILURE;
winctx->maj_stat = 0;
InputBufferDescriptor.cBuffers = 2;
InputBufferDescriptor.pBuffers = InputSecurityToken;
InputBufferDescriptor.ulVersion = SECBUFFER_VERSION;
InputSecurityToken[0].BufferType = SECBUFFER_DATA;
InputSecurityToken[0].cbBuffer = buf->length;
InputSecurityToken[0].pvBuffer = buf->value;
InputSecurityToken[1].BufferType = SECBUFFER_TOKEN;
InputSecurityToken[1].cbBuffer = mic->length;
InputSecurityToken[1].pvBuffer = mic->value;
winctx->maj_stat = p_VerifySignature(&winctx->context,
&InputBufferDescriptor,
0, &qop);
return winctx->maj_stat;
}
static Ssh_gss_stat ssh_sspi_free_mic(struct ssh_gss_library *lib,
Ssh_gss_buf *hash)
{
sfree(hash->value);
return SSH_GSS_OK;
}
static void ssh_sspi_bind_fns(struct ssh_gss_library *lib)
{
lib->indicate_mech = ssh_sspi_indicate_mech;
lib->import_name = ssh_sspi_import_name;
lib->release_name = ssh_sspi_release_name;
lib->init_sec_context = ssh_sspi_init_sec_context;
lib->free_tok = ssh_sspi_free_tok;
lib->acquire_cred = ssh_sspi_acquire_cred;
lib->release_cred = ssh_sspi_release_cred;
lib->get_mic = ssh_sspi_get_mic;
lib->verify_mic = ssh_sspi_verify_mic;
lib->free_mic = ssh_sspi_free_mic;
lib->display_status = ssh_sspi_display_status;
}
#else
/* Dummy function so this source file defines something if NO_GSSAPI
is defined. */
void ssh_gss_init(void)
{
}
#endif
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