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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "auth_ntlm.h"
#include "common.h"
#include "str.h"
#include "auth.h"
#include "git2/sys/credential.h"
#ifdef GIT_NTLM
#include "ntlmclient.h"
typedef struct {
git_http_auth_context parent;
ntlm_client *ntlm;
char *challenge;
bool complete;
} http_auth_ntlm_context;
static int ntlm_set_challenge(
git_http_auth_context *c,
const char *challenge)
{
http_auth_ntlm_context *ctx = (http_auth_ntlm_context *)c;
GIT_ASSERT_ARG(ctx);
GIT_ASSERT_ARG(challenge);
git__free(ctx->challenge);
ctx->challenge = git__strdup(challenge);
GIT_ERROR_CHECK_ALLOC(ctx->challenge);
return 0;
}
static int ntlm_set_credentials(http_auth_ntlm_context *ctx, git_credential *_cred)
{
git_credential_userpass_plaintext *cred;
const char *sep, *username;
char *domain = NULL, *domainuser = NULL;
int error = 0;
GIT_ASSERT(_cred->credtype == GIT_CREDENTIAL_USERPASS_PLAINTEXT);
cred = (git_credential_userpass_plaintext *)_cred;
if ((sep = strchr(cred->username, '\\')) != NULL) {
domain = git__strndup(cred->username, (sep - cred->username));
GIT_ERROR_CHECK_ALLOC(domain);
domainuser = git__strdup(sep + 1);
GIT_ERROR_CHECK_ALLOC(domainuser);
username = domainuser;
} else {
username = cred->username;
}
if (ntlm_client_set_credentials(ctx->ntlm,
username, domain, cred->password) < 0) {
git_error_set(GIT_ERROR_NET, "could not set credentials: %s",
ntlm_client_errmsg(ctx->ntlm));
error = -1;
goto done;
}
done:
git__free(domain);
git__free(domainuser);
return error;
}
static int ntlm_next_token(
git_str *buf,
git_http_auth_context *c,
git_credential *cred)
{
http_auth_ntlm_context *ctx = (http_auth_ntlm_context *)c;
git_str input_buf = GIT_STR_INIT;
const unsigned char *msg;
size_t challenge_len, msg_len;
int error = GIT_EAUTH;
GIT_ASSERT_ARG(buf);
GIT_ASSERT_ARG(ctx);
GIT_ASSERT(ctx->ntlm);
challenge_len = ctx->challenge ? strlen(ctx->challenge) : 0;
if (ctx->complete)
ntlm_client_reset(ctx->ntlm);
/*
* Set us complete now since it's the default case; the one
* incomplete case (successfully created a client request)
* will explicitly set that it requires a second step.
*/
ctx->complete = true;
if (cred && ntlm_set_credentials(ctx, cred) != 0)
goto done;
if (challenge_len < 4) {
git_error_set(GIT_ERROR_NET, "no ntlm challenge sent from server");
goto done;
} else if (challenge_len == 4) {
if (memcmp(ctx->challenge, "NTLM", 4) != 0) {
git_error_set(GIT_ERROR_NET, "server did not request NTLM");
goto done;
}
if (ntlm_client_negotiate(&msg, &msg_len, ctx->ntlm) != 0) {
git_error_set(GIT_ERROR_NET, "ntlm authentication failed: %s",
ntlm_client_errmsg(ctx->ntlm));
goto done;
}
ctx->complete = false;
} else {
if (memcmp(ctx->challenge, "NTLM ", 5) != 0) {
git_error_set(GIT_ERROR_NET, "challenge from server was not NTLM");
goto done;
}
if (git_str_decode_base64(&input_buf,
ctx->challenge + 5, challenge_len - 5) < 0) {
git_error_set(GIT_ERROR_NET, "invalid NTLM challenge from server");
goto done;
}
if (ntlm_client_set_challenge(ctx->ntlm,
(const unsigned char *)input_buf.ptr, input_buf.size) != 0) {
git_error_set(GIT_ERROR_NET, "ntlm challenge failed: %s",
ntlm_client_errmsg(ctx->ntlm));
goto done;
}
if (ntlm_client_response(&msg, &msg_len, ctx->ntlm) != 0) {
git_error_set(GIT_ERROR_NET, "ntlm authentication failed: %s",
ntlm_client_errmsg(ctx->ntlm));
goto done;
}
}
git_str_puts(buf, "NTLM ");
git_str_encode_base64(buf, (const char *)msg, msg_len);
if (git_str_oom(buf))
goto done;
error = 0;
done:
git_str_dispose(&input_buf);
return error;
}
static int ntlm_is_complete(git_http_auth_context *c)
{
http_auth_ntlm_context *ctx = (http_auth_ntlm_context *)c;
GIT_ASSERT_ARG(ctx);
return (ctx->complete == true);
}
static void ntlm_context_free(git_http_auth_context *c)
{
http_auth_ntlm_context *ctx = (http_auth_ntlm_context *)c;
ntlm_client_free(ctx->ntlm);
git__free(ctx->challenge);
git__free(ctx);
}
static int ntlm_init_context(
http_auth_ntlm_context *ctx,
const git_net_url *url)
{
GIT_UNUSED(url);
if ((ctx->ntlm = ntlm_client_init(NTLM_CLIENT_DEFAULTS)) == NULL) {
git_error_set_oom();
return -1;
}
return 0;
}
int git_http_auth_ntlm(
git_http_auth_context **out,
const git_net_url *url)
{
http_auth_ntlm_context *ctx;
GIT_UNUSED(url);
*out = NULL;
ctx = git__calloc(1, sizeof(http_auth_ntlm_context));
GIT_ERROR_CHECK_ALLOC(ctx);
if (ntlm_init_context(ctx, url) < 0) {
git__free(ctx);
return -1;
}
ctx->parent.type = GIT_HTTP_AUTH_NTLM;
ctx->parent.credtypes = GIT_CREDENTIAL_USERPASS_PLAINTEXT;
ctx->parent.connection_affinity = 1;
ctx->parent.set_challenge = ntlm_set_challenge;
ctx->parent.next_token = ntlm_next_token;
ctx->parent.is_complete = ntlm_is_complete;
ctx->parent.free = ntlm_context_free;
*out = (git_http_auth_context *)ctx;
return 0;
}
#endif /* GIT_NTLM */
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