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http: for basic+digest auth, do not engage on empty user+passwd

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Since we have the quirky of empty credentials (the empty string for
username and password) for Negotiate reactivated, we need to check for
this when considering Basic and Digest auth.

Verify a redirect to blank user+password in test 2208

Closes #22060
This commit is contained in:
Stefan Eissing 2026-06-17 12:06:29 +02:00 • committed by Daniel Stenberg
parent 8c3ef95adf
commit d2886c5ac4
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GPG key ID: 5CC908FDB71E12C2
4 changed files with 105 additions and 7 deletions
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19
lib/http.c
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@ -347,8 +347,10 @@ fail:
*
* return TRUE if one was picked
*/
static bool pickoneauth(struct auth *pick, unsigned long mask)
static bool pickoneauth(struct auth *pick, unsigned long mask,
struct Curl_creds *creds)
{
bool have_user_pass = Curl_creds_has_user_or_pass(creds);
bool picked;
/* only deal with authentication we want */
unsigned long avail = pick->avail & pick->want & mask;
@ -356,20 +358,20 @@ static bool pickoneauth(struct auth *pick, unsigned long mask)
/* The order of these checks is highly relevant, as this will be the order
of preference in case of the existence of multiple accepted types. */
if(avail & CURLAUTH_NEGOTIATE)
if(avail & CURLAUTH_NEGOTIATE) /* available on empty creds */
pick->picked = CURLAUTH_NEGOTIATE;
#ifndef CURL_DISABLE_BEARER_AUTH
else if(avail & CURLAUTH_BEARER)
else if((avail & CURLAUTH_BEARER) && Curl_creds_has_oauth_bearer(creds))
pick->picked = CURLAUTH_BEARER;
#endif
#ifndef CURL_DISABLE_DIGEST_AUTH
else if(avail & CURLAUTH_DIGEST)
else if((avail & CURLAUTH_DIGEST) && have_user_pass)
pick->picked = CURLAUTH_DIGEST;
#endif
else if(avail & CURLAUTH_NTLM)
pick->picked = CURLAUTH_NTLM;
#ifndef CURL_DISABLE_BASIC_AUTH
else if(avail & CURLAUTH_BASIC)
else if((avail & CURLAUTH_BASIC) && have_user_pass)
pick->picked = CURLAUTH_BASIC;
#endif
#ifndef CURL_DISABLE_AWS
@ -568,7 +570,7 @@ CURLcode Curl_http_auth_act(struct Curl_easy *data)
if(data->state.creds &&
((data->req.httpcode == 401) ||
(data->req.authneg && data->req.httpcode < 300))) {
pickhost = pickoneauth(&data->state.authhost, authmask);
pickhost = pickoneauth(&data->state.authhost, authmask, data->state.creds);
if(!pickhost)
data->state.authproblem = TRUE;
else
@ -586,7 +588,8 @@ CURLcode Curl_http_auth_act(struct Curl_easy *data)
((data->req.httpcode == 407) ||
(data->req.authneg && data->req.httpcode < 300))) {
pickproxy = pickoneauth(&data->state.authproxy,
authmask & ~CURLAUTH_BEARER);
authmask & ~CURLAUTH_BEARER,
conn->http_proxy.creds);
if(!pickproxy)
data->state.authproblem = TRUE;
else
@ -699,10 +702,12 @@ static CURLcode output_auth_headers(struct Curl_easy *data,
if(
#ifndef CURL_DISABLE_PROXY
(proxy && conn->http_proxy.creds &&
Curl_creds_has_user_or_pass(conn->http_proxy.creds) &&
!Curl_checkProxyheaders(data, conn,
STRCONST("Proxy-authorization"))) ||
#endif
(!proxy && data->state.creds &&
Curl_creds_has_user_or_pass(data->state.creds) &&
!Curl_checkheaders(data, STRCONST("Authorization")))) {
auth = "Basic";
result = http_output_basic(data, conn, proxy);