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WinHTTP: support best auth mechanism

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For username/password credentials, support NTLM or Basic (in that order
of priority).  Use the WinHTTP built-in authentication support for both,
and maintain a bitfield of the supported mechanisms from the response.
This commit is contained in:
Edward Thomson 2016-12-30 12:13:34 -05:00
parent cb76eed5ce
commit 4e4a1460eb
1 changed files with 64 additions and 67 deletions
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123
src/transports/winhttp.c
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@ -68,7 +68,8 @@ static const IID IID_IInternetSecurityManager_mingw =
typedef enum {
GIT_WINHTTP_AUTH_BASIC = 1,
GIT_WINHTTP_AUTH_NEGOTIATE = 2,
GIT_WINHTTP_AUTH_NTLM = 2,
GIT_WINHTTP_AUTH_NEGOTIATE = 4,
} winhttp_authmechanism_t;
typedef struct {
@ -95,79 +96,66 @@ typedef struct {
git_cred *cred;
git_cred *url_cred;
git_cred *proxy_cred;
int auth_mechanism;
int auth_mechanisms;
HINTERNET session;
HINTERNET connection;
} winhttp_subtransport;
static int apply_basic_credential_proxy(HINTERNET request, git_cred *cred)
static int _apply_userpass_credential(HINTERNET request, DWORD target, DWORD scheme, git_cred *cred)
{
git_cred_userpass_plaintext *c = (git_cred_userpass_plaintext *)cred;
wchar_t *user, *pass;
int error;
int user_len = 0, pass_len = 0, error = 0;
if ((error = git__utf8_to_16_alloc(&user, c->username)) < 0)
return error;
if ((error = user_len = git__utf8_to_16_alloc(&user, c->username)) < 0)
goto done;
if ((error = git__utf8_to_16_alloc(&pass, c->password)) < 0)
return error;
if ((error = pass_len = git__utf8_to_16_alloc(&pass, c->password)) < 0)
goto done;
if (!WinHttpSetCredentials(request, WINHTTP_AUTH_TARGET_PROXY, WINHTTP_AUTH_SCHEME_BASIC,
user, pass, NULL)) {
giterr_set(GITERR_OS, "failed to set proxy auth");
if (!WinHttpSetCredentials(request, target, scheme, user, pass, NULL)) {
giterr_set(GITERR_OS, "failed to set credentials");
error = -1;
}
done:
if (user_len > 0)
git__memzero(user, user_len * sizeof(wchar_t));
if (pass_len > 0)
git__memzero(pass, pass_len * sizeof(wchar_t));
git__free(user);
git__free(pass);
return error;
}
static int apply_basic_credential(HINTERNET request, git_cred *cred)
static int apply_userpass_credential_proxy(HINTERNET request, git_cred *cred)
{
git_cred_userpass_plaintext *c = (git_cred_userpass_plaintext *)cred;
git_buf buf = GIT_BUF_INIT, raw = GIT_BUF_INIT;
wchar_t *wide = NULL;
int error = -1, wide_len;
git_buf_printf(&raw, "%s:%s", c->username, c->password);
if (git_buf_oom(&raw) ||
git_buf_puts(&buf, "Authorization: Basic ") < 0 ||
git_buf_encode_base64(&buf, git_buf_cstr(&raw), raw.size) < 0)
goto on_error;
if ((wide_len = git__utf8_to_16_alloc(&wide, git_buf_cstr(&buf))) < 0) {
giterr_set(GITERR_OS, "failed to convert string to wide form");
goto on_error;
return _apply_userpass_credential(request, WINHTTP_AUTH_TARGET_PROXY,
WINHTTP_AUTH_SCHEME_BASIC, cred);
}
if (!WinHttpAddRequestHeaders(request, wide, (ULONG) -1L, WINHTTP_ADDREQ_FLAG_ADD)) {
giterr_set(GITERR_OS, "failed to add a header to the request");
goto on_error;
static int apply_userpass_credential(HINTERNET request, int mechanisms, git_cred *cred)
{
DWORD native_scheme;
if ((mechanisms & GIT_WINHTTP_AUTH_NTLM) ||
(mechanisms & GIT_WINHTTP_AUTH_NEGOTIATE)) {
native_scheme = WINHTTP_AUTH_SCHEME_NTLM;
} else if (mechanisms & GIT_WINHTTP_AUTH_BASIC) {
native_scheme = WINHTTP_AUTH_SCHEME_BASIC;
} else {
giterr_set(GITERR_NET, "invalid authentication scheme");
return -1;
}
error = 0;
on_error:
/* We were dealing with plaintext passwords, so clean up after ourselves a bit. */
if (wide)
memset(wide, 0x0, wide_len * sizeof(wchar_t));
if (buf.size)
memset(buf.ptr, 0x0, buf.size);
if (raw.size)
memset(raw.ptr, 0x0, raw.size);
git__free(wide);
git_buf_free(&buf);
git_buf_free(&raw);
return error;
return _apply_userpass_credential(request, WINHTTP_AUTH_TARGET_SERVER,
native_scheme, cred);
}
static int apply_default_credentials(HINTERNET request)
static int apply_default_credentials(HINTERNET request, int mechanisms)
{
/* Either the caller explicitly requested that default credentials be passed,
* or our fallback credential callback was invoked and checked that the target
@ -177,6 +165,12 @@ static int apply_default_credentials(HINTERNET request)
* to Internet Explorer security zones, but in fact does not. */
DWORD data = WINHTTP_AUTOLOGON_SECURITY_LEVEL_LOW;
if ((mechanisms & GIT_WINHTTP_AUTH_NTLM) == 0 &&
(mechanisms & GIT_WINHTTP_AUTH_NEGOTIATE) == 0) {
giterr_set(GITERR_NET, "invalid authentication scheme");
return -1;
}
if (!WinHttpSetOption(request, WINHTTP_OPTION_AUTOLOGON_POLICY, &data, sizeof(DWORD)))
return -1;
@ -453,7 +447,7 @@ static int winhttp_stream_connect(winhttp_stream *s)
if (t->proxy_cred) {
if (t->proxy_cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT) {
if ((error = apply_basic_credential_proxy(s->request, t->proxy_cred)) < 0)
if ((error = apply_userpass_credential_proxy(s->request, t->proxy_cred)) < 0)
goto on_error;
}
}
@ -550,13 +544,11 @@ static int winhttp_stream_connect(winhttp_stream *s)
/* If we have a credential on the subtransport, apply it to the request */
if (t->cred &&
t->cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT &&
t->auth_mechanism == GIT_WINHTTP_AUTH_BASIC &&
apply_basic_credential(s->request, t->cred) < 0)
apply_userpass_credential(s->request, t->auth_mechanisms, t->cred) < 0)
goto on_error;
else if (t->cred &&
t->cred->credtype == GIT_CREDTYPE_DEFAULT &&
t->auth_mechanism == GIT_WINHTTP_AUTH_NEGOTIATE &&
apply_default_credentials(s->request) < 0)
apply_default_credentials(s->request, t->auth_mechanisms) < 0)
goto on_error;
/* If no other credentials have been applied and the URL has username and
@ -565,7 +557,7 @@ static int winhttp_stream_connect(winhttp_stream *s)
if (!t->url_cred &&
git_cred_userpass_plaintext_new(&t->url_cred, t->connection_data.user, t->connection_data.pass) < 0)
goto on_error;
if (apply_basic_credential(s->request, t->url_cred) < 0)
if (apply_userpass_credential(s->request, GIT_WINHTTP_AUTH_BASIC, t->url_cred) < 0)
goto on_error;
}
@ -585,12 +577,12 @@ on_error:
static int parse_unauthorized_response(
HINTERNET request,
int *allowed_types,
int *auth_mechanism)
int *allowed_mechanisms)
{
DWORD supported, first, target;
*allowed_types = 0;
*auth_mechanism = 0;
*allowed_mechanisms = 0;
/* WinHttpQueryHeaders() must be called before WinHttpQueryAuthSchemes().
* We can assume this was already done, since we know we are unauthorized.
@ -600,15 +592,20 @@ static int parse_unauthorized_response(
return -1;
}
if (WINHTTP_AUTH_SCHEME_BASIC & supported) {
if (WINHTTP_AUTH_SCHEME_NTLM & supported) {
*allowed_types |= GIT_CREDTYPE_USERPASS_PLAINTEXT;
*auth_mechanism = GIT_WINHTTP_AUTH_BASIC;
*allowed_types |= GIT_CREDTYPE_DEFAULT;
*allowed_mechanisms = GIT_WINHTTP_AUTH_NEGOTIATE;
}
if ((WINHTTP_AUTH_SCHEME_NTLM & supported) ||
(WINHTTP_AUTH_SCHEME_NEGOTIATE & supported)) {
if (WINHTTP_AUTH_SCHEME_NEGOTIATE & supported) {
*allowed_types |= GIT_CREDTYPE_DEFAULT;
*auth_mechanism = GIT_WINHTTP_AUTH_NEGOTIATE;
*allowed_mechanisms = GIT_WINHTTP_AUTH_NEGOTIATE;
}
if (WINHTTP_AUTH_SCHEME_BASIC & supported) {
*allowed_types |= GIT_CREDTYPE_USERPASS_PLAINTEXT;
*allowed_mechanisms |= GIT_WINHTTP_AUTH_BASIC;
}
return 0;
@ -1029,7 +1026,7 @@ replay:
if (status_code == HTTP_STATUS_PROXY_AUTH_REQ) {
int allowed_types;
if (parse_unauthorized_response(s->request, &allowed_types, &t->auth_mechanism) < 0)
if (parse_unauthorized_response(s->request, &allowed_types, &t->auth_mechanisms) < 0)
return -1;
/* TODO: extract the username from the url, no payload? */
@ -1049,7 +1046,7 @@ replay:
if (HTTP_STATUS_DENIED == status_code && get_verb == s->verb) {
int allowed_types;
if (parse_unauthorized_response(s->request, &allowed_types, &t->auth_mechanism) < 0)
if (parse_unauthorized_response(s->request, &allowed_types, &t->auth_mechanisms) < 0)
return -1;
if (allowed_types) {