curl/backport-tool_getparam-clear-sensitive-arguments-better.patch

From 654f8cb5f353905c6eb5b2a6ef7e5beafa7d0634 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 19 Feb 2025 23:55:31 +0100
Subject: [PATCH] tool_getparam: clear sensitive arguments better
 
curl attempts to clear some flags to hide them from snooping neighbors
(on platforms where it works). For example the credentials provided with
-u. Previously it would only do that if there was a space between the
option and the credentials as in "-u joe:s3cr3t" but not when done
without a separating space as in "-ujoe:s3cr3t".
 
This addresses that previous shortcoming.
 
Reported-by: kayrus on github
Fixes #16396
Closes #16401
 
Conflict:context adapt
Reference:https://github.com/curl/curl/commit/654f8cb5f353905c6eb5b2a6ef7e5beafa7d0634
---
 src/tool_getparam.c | 18 ++++++++++++------
 src/tool_getparam.h |  3 ++-
 src/tool_parsecfg.c |  3 ++-
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index d9772a3..53e3b76 100644
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -740,7 +740,8 @@ out:
 
 ParameterError getparameter(const char *flag, /* f or -long-flag */
                             char *nextarg,    /* NULL if unset */
-                            argv_item_t cleararg,
+                            argv_item_t cleararg1,
+                            argv_item_t cleararg2,
                             bool *usedarg,    /* set to TRUE if the arg
                                                  has been used */
                             struct GlobalConfig *global,
@@ -769,7 +770,8 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
 #ifdef HAVE_WRITABLE_ARGV
   argv_item_t clearthis = NULL;
 #else
-  (void)cleararg;
+  (void)cleararg1;
+  (void)cleararg2;
 #endif
 
   *usedarg = FALSE; /* default is that we don't use the arg */
@@ -879,6 +881,9 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
       if(!longopt && parse[1]) {
         nextarg = (char *)&parse[1]; /* this is the actual extra parameter */
         singleopt = TRUE;   /* don't loop anymore after this */
+#ifdef HAVE_WRITABLE_ARGV
+        clearthis = &cleararg1[parse + 2 - flag];
+#endif
       }
       else if(!nextarg) {
         err = PARAM_REQUIRES_PARAMETER;
@@ -886,7 +891,7 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
       }
       else {
 #ifdef HAVE_WRITABLE_ARGV
-        clearthis = cleararg;
+        clearthis = cleararg2;
 #endif
         *usedarg = TRUE; /* mark it as used */
       }
@@ -2714,8 +2719,8 @@ ParameterError parse_args(struct GlobalConfig *global, int argc,
           }
         }
 
-        result = getparameter(orig_opt, nextarg, argv[i + 1], &passarg,
-                              global, config);
+        result = getparameter(orig_opt, nextarg, argv[i], argv[i + 1],
+                              &passarg, global, config);
 
         curlx_unicodefree(nextarg);
         config = global->last;
@@ -2757,7 +2762,8 @@ ParameterError parse_args(struct GlobalConfig *global, int argc,
       bool used;
 
       /* Just add the URL please */
-      result = getparameter("--url", orig_opt, argv[i], &used, global, config);
+      result = getparameter("--url", orig_opt, NULL, NULL,
+                            &used, global, config);
     }
 
     if(!result)
diff --git a/src/tool_getparam.h b/src/tool_getparam.h
index a8a9d45..1a7ec4f 100644
--- a/src/tool_getparam.h
+++ b/src/tool_getparam.h
@@ -56,7 +56,8 @@ struct GlobalConfig;
 struct OperationConfig;
 
 ParameterError getparameter(const char *flag, char *nextarg,
-                            argv_item_t cleararg,
+                            argv_item_t cleararg1,
+                            argv_item_t cleararg2,
                             bool *usedarg,
                             struct GlobalConfig *global,
                             struct OperationConfig *operation);
diff --git a/src/tool_parsecfg.c b/src/tool_parsecfg.c
index c15f210..3f9e4e5 100644
--- a/src/tool_parsecfg.c
+++ b/src/tool_parsecfg.c
@@ -223,7 +223,8 @@ int parseconfig(const char *filename, struct GlobalConfig *global)
 #ifdef DEBUG_CONFIG
       fprintf(tool_stderr, "PARAM: \"%s\"\n",(param ? param : "(null)"));
 #endif
-      res = getparameter(option, param, NULL, &usedarg, global, operation);
+      res = getparameter(option, param, NULL, NULL,
+                         &usedarg, global, operation);
       operation = global->last;
 
       if(!res && param && *param && !usedarg)
-- 
2.43.0