From 9bee39bfed2c413b4cc4eb306a57ac92a1854907 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sat, 12 Oct 2024 23:54:39 +0200
Subject: [PATCH] url: use same credentials on redirect

Previously it could lose the username and only use the password.

Added test 998 and 999 to verify.

Reported-by: Tobias Bora
Fixes #15262
Closes #15282

Conflict:context adapt
Reference:https://github.com/curl/curl/commit/9bee39bfed2c413b4cc4eb306a57ac92a1854907
---
 lib/transfer.c         |   3 +
 lib/url.c              |  19 ++++---
 lib/urldata.h          |   9 ++-
 tests/data/Makefile.inc | 14 +++++++-------
 tests/data/test998     |  92 ++++++++++++++++++++++++++++++
 tests/data/test999     |  81 ++++++++++++++++++++++++++
 6 files changed, 195 insertions(+), 11 deletions(-)
 create mode 100644 tests/data/test998
 create mode 100644 tests/data/test999

diff --git a/lib/transfer.c b/lib/transfer.c
index 79d648cab..3a9239254 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -679,6 +679,9 @@ CURLcode Curl_pretransfer(struct Curl_easy *data)
       return CURLE_OUT_OF_MEMORY;
   }
 
+  if(data->set.str[STRING_USERNAME] ||
+     data->set.str[STRING_PASSWORD])
+    data->state.creds_from = CREDS_OPTION;
   if(!result)
     result = Curl_setstropt(&data->state.aptr.user,
                             data->set.str[STRING_USERNAME]);
diff --git a/lib/url.c b/lib/url.c
index 45745bc60..261f61d8d 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -1860,10 +1860,10 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
     return result;
 
   /*
-   * User name and password set with their own options override the
-   * credentials possibly set in the URL.
+   * username and password set with their own options override the credentials
+   * possibly set in the URL, but netrc does not.
    */
-  if(!data->set.str[STRING_PASSWORD]) {
+  if(!data->state.aptr.passwd || (data->state.creds_from != CREDS_OPTION)) {
     uc = curl_url_get(uh, CURLUPART_PASSWORD, &data->state.up.password, 0);
     if(!uc) {
       char *decoded;
@@ -1876,12 +1876,13 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
       result = Curl_setstropt(&data->state.aptr.passwd, decoded);
       if(result)
         return result;
+      data->state.creds_from = CREDS_URL;
     }
     else if(uc != CURLUE_NO_PASSWORD)
       return Curl_uc_to_curlcode(uc);
   }
 
-  if(!data->set.str[STRING_USERNAME]) {
+  if(!data->state.aptr.user || (data->state.creds_from != CREDS_OPTION)) {
     /* we don't use the URL API's URL decoder option here since it rejects
        control codes and we want to allow them for some schemes in the user
        and password fields */
@@ -1895,13 +1896,10 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
         return result;
       conn->user = decoded;
       result = Curl_setstropt(&data->state.aptr.user, decoded);
+      data->state.creds_from = CREDS_URL;
     }
     else if(uc != CURLUE_NO_USER)
       return Curl_uc_to_curlcode(uc);
-    else if(data->state.aptr.passwd) {
-      /* no user was set but a password, set a blank user */
-      result = Curl_setstropt(&data->state.aptr.user, "");
-    }
     if(result)
       return result;
   }
@@ -2685,7 +2683,8 @@ static CURLcode override_login(struct Curl_easy *data,
     int ret;
     bool url_provided = FALSE;
 
-    if(data->state.aptr.user) {
+    if(data->state.aptr.user &&
+       (data->state.creds_from != CREDS_NETRC)) {
       /* there was a user name in the URL. Use the URL decoded version */
       userp = &data->state.aptr.user;
       url_provided = TRUE;
@@ -2733,6 +2732,7 @@ static CURLcode override_login(struct Curl_easy *data,
       result = Curl_setstropt(&data->state.aptr.user, *userp);
       if(result)
         return result;
+      data->state.creds_from = CREDS_NETRC;
     }
   }
   if(data->state.aptr.user) {
@@ -2750,6 +2750,7 @@ static CURLcode override_login(struct Curl_easy *data,
     CURLcode result = Curl_setstropt(&data->state.aptr.passwd, *passwdp);
     if(result)
       return result;
+    data->state.creds_from = CREDS_NETRC;
   }
   if(data->state.aptr.passwd) {
     uc = curl_url_set(data->state.uh, CURLUPART_PASSWORD,
diff --git a/lib/urldata.h b/lib/urldata.h
index 6aa26237d..73f662159 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1206,6 +1206,11 @@ struct urlpieces {
   char *query;
 };
 
+#define CREDS_NONE   0
+#define CREDS_URL    1 /* from URL */
+#define CREDS_OPTION 2 /* set with a CURLOPT_ */
+#define CREDS_NETRC  3 /* found in netrc */
+
 struct UrlState {
   /* Points to the connection cache */
   struct conncache *conn_cache;
@@ -1344,7 +1349,6 @@ struct UrlState {
     char *proxyuser;
     char *proxypasswd;
   } aptr;
-
   unsigned char httpwant; /* when non-zero, a specific HTTP version requested
                              to be used in the library's request(s) */
   unsigned char httpversion; /* the lowest HTTP version*10 reported by any
@@ -1354,6 +1358,9 @@ struct UrlState {
   unsigned char dselect_bits; /* != 0 -> bitmask of socket events for this
                                  transfer overriding anything the socket may
                                  report */
+  unsigned int creds_from:2; /* where is the server credentials originating
+                                from, see the CREDS_* defines above */
+
 #ifdef CURLDEBUG
   BIT(conncache_lock);
 #endif
diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
index 480a88208..02bf2ae25 100644
--- a/tests/data/Makefile.inc
+++ b/tests/data/Makefile.inc
@@ -133,7 +133,7 @@ test961 test962 test963 test964 test965 test966 test967 test968 test969 \
 test961 test962 test963 test964 test965 test966 test967 test968 test969 \
 test970 test971 test972 test973 test974 test975 test976 test977 test978 \
 test979 test980 test981 test982 test983 test984 test985 test986 test987 \
-test988 test989 test990 test991 \
+test988 test989 test990 test991 test998 test999 \
 \
 test1000 test1001 test1002 test1003 test1004 test1005 test1006 test1007 \
 test1008 test1009 test1010 test1011 test1012 test1013 test1014 test1015 \
diff --git a/tests/data/test998 b/tests/data/test998
new file mode 100644
index 000000000..c3a8f5169
--- /dev/null
+++ b/tests/data/test998
@@ -0,0 +1,92 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+--location-trusted
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+HTTP/1.1 301 redirect
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 0
+Connection: close
+Content-Type: text/html
+Location: http://somewhere.else.example/a/path/%TESTNUMBER0002
+
+</data>
+<data2>
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 6
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</data2>
+
+<datacheck>
+HTTP/1.1 301 redirect
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 0
+Connection: close
+Content-Type: text/html
+Location: http://somewhere.else.example/a/path/%TESTNUMBER0002
+
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 6
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</datacheck>
+
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+proxy
+</features>
+<server>
+http
+</server>
+<name>
+HTTP with auth in URL redirected to another host
+</name>
+<command>
+-x %HOSTIP:%HTTPPORT http://alberto:einstein@somwhere.example/%TESTNUMBER --location-trusted
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+QUIT
+</strip>
+<protocol>
+GET http://somwhere.example/998 HTTP/1.1
+Host: somwhere.example
+Authorization: Basic YWxiZXJ0bzplaW5zdGVpbg==
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://somewhere.else.example/a/path/9980002 HTTP/1.1
+Host: somewhere.else.example
+Authorization: Basic YWxiZXJ0bzplaW5zdGVpbg==
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+</verify>
+</testcase>
diff --git a/tests/data/test999 b/tests/data/test999
new file mode 100644
index 000000000..990a8d09a
--- /dev/null
+++ b/tests/data/test999
@@ -0,0 +1,81 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+--location-trusted
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 6
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</data>
+
+<datacheck>
+HTTP/1.1 301 redirect
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 0
+Connection: close
+Content-Type: text/html
+Location: http://somewhere.else.example/a/path/%TESTNUMBER0002
+
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 6
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</datacheck>
+
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+proxy
+</features>
+<server>
+http
+</server>
+<name>
+HTTP with auth in first URL but not second
+</name>
+<command>
+-x %HOSTIP:%HTTPPORT http://alberto:einstein@somwhere.example/%TESTNUMBER http://somewhere.else.example/%TESTNUMBER
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+QUIT
+</strip>
+<protocol>
+GET http://somwhere.example/%TESTNUMBER HTTP/1.1
+Host: somwhere.example
+Authorization: Basic YWxiZXJ0bzplaW5zdGVpbg==
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://somewhere.else.example/%TESTNUMBER HTTP/1.1
+Host: somewhere.else.example
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+</verify>
+</testcase>
-- 
2.33.0