mirror of
https://git.tartarus.org/simon/putty.git
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320 lines
9.0 KiB
C
320 lines
9.0 KiB
C
#ifndef NO_GSSAPI
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#include <windows.h>
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#define SECURITY_WIN32
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#include <security.h>
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#include "sshgss.h"
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#include "misc.h"
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#define NOTHING
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#define DECL_SSPI_FUNCTION(linkage, rettype, name, params) \
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typedef rettype (WINAPI *t_##name) params; \
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linkage t_##name p_##name
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#define GET_SSPI_FUNCTION(module, name) \
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p_##name = module ? (t_##name) GetProcAddress(module, #name) : NULL
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DECL_SSPI_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_SSPI_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_SSPI_FUNCTION(static, SECURITY_STATUS,
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FreeContextBuffer,
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(PVOID));
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DECL_SSPI_FUNCTION(static, SECURITY_STATUS,
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FreeCredentialsHandle,
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(PCredHandle));
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DECL_SSPI_FUNCTION(static, SECURITY_STATUS,
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DeleteSecurityContext,
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(PCtxtHandle));
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DECL_SSPI_FUNCTION(static, SECURITY_STATUS,
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QueryContextAttributesA,
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(PCtxtHandle, ULONG, PVOID));
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DECL_SSPI_FUNCTION(static, SECURITY_STATUS,
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MakeSignature,
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(PCtxtHandle, ULONG, PSecBufferDesc, ULONG));
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static HMODULE security_module = NULL;
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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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int ssh_gss_init(void)
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{
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if (security_module)
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return 1; /* already initialised */
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security_module = LoadLibrary("secur32.dll");
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if (security_module) {
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GET_SSPI_FUNCTION(security_module, AcquireCredentialsHandleA);
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GET_SSPI_FUNCTION(security_module, InitializeSecurityContextA);
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GET_SSPI_FUNCTION(security_module, FreeContextBuffer);
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GET_SSPI_FUNCTION(security_module, FreeCredentialsHandle);
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GET_SSPI_FUNCTION(security_module, DeleteSecurityContext);
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GET_SSPI_FUNCTION(security_module, QueryContextAttributesA);
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GET_SSPI_FUNCTION(security_module, MakeSignature);
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return 1;
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}
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return 0;
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}
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Ssh_gss_stat ssh_gss_indicate_mech(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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Ssh_gss_stat ssh_gss_import_name(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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Ssh_gss_stat ssh_gss_acquire_cred(Ssh_gss_ctx *ctx)
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{
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winSsh_gss_ctx *winctx = snew(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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Ssh_gss_stat ssh_gss_init_sec_context(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->len,SECBUFFER_TOKEN,send_tok->data};
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SecBuffer wrecv_tok = {recv_tok->len,SECBUFFER_TOKEN,recv_tok->data};
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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->data = (char*) wsend_tok.pvBuffer;
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send_tok->len = 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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Ssh_gss_stat ssh_gss_free_tok(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->data);
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send_tok->len = 0; send_tok->data = NULL;
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return SSH_GSS_OK;
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}
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Ssh_gss_stat ssh_gss_release_cred(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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Ssh_gss_stat ssh_gss_release_name(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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Ssh_gss_stat ssh_gss_display_status(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->data = dupstr(msg);
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buf->len = strlen(buf->data);
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return SSH_GSS_OK;
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}
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Ssh_gss_stat ssh_gss_get_mic(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->len;
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InputSecurityToken[0].pvBuffer = buf->data;
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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->len = InputSecurityToken[1].cbBuffer;
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hash->data = InputSecurityToken[1].pvBuffer;
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}
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return winctx->maj_stat;
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}
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Ssh_gss_stat ssh_gss_free_mic(Ssh_gss_buf *hash)
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{
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sfree(hash->data);
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return SSH_GSS_OK;
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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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int ssh_gss_init(void)
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{
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return 0;
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}
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#endif
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