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HAVE_WRITABLE_ARGV is set if argv[] is writable on the system, and then

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we attempt to hide some of the more sensitive command line arguments
This commit is contained in:
Daniel Stenberg 2003-01-29 13:16:03 +00:00
parent 30a46e1135
commit 7f67a28c2a
3 changed files with 38 additions and 0 deletions
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16
configure.in
View File

@ -318,6 +318,22 @@ if test -n "$RANDOM_FILE" ; then
[a suitable file to read random data from])
fi
dnl **********************************************************************
dnl Check if the operating system allows programs to write to their own argv[]
dnl **********************************************************************
AC_MSG_CHECKING([if argv can be written to])
AC_TRY_RUN([
int main(int argc, char ** argv) {
argv[0][0] = ' ';
return (argv[0][0] == ' ')?0:1;
}
],
AC_DEFINE(HAVE_WRITABLE_ARGV, 1, [Define this symbol if your OS supports changing the contents of argv])
AC_MSG_RESULT(yes),
AC_MSG_RESULT(no)
)
dnl **********************************************************************
dnl Check for the presence of Kerberos4 libraries and headers
dnl **********************************************************************

3
src/config.h.in
View File

@ -35,3 +35,6 @@
/* Define if you have the `poll' function. */
#undef HAVE_POLL
/* Define if you can write to argc[] strings */
#undef HAVE_WRITABLE_ARGV

19
src/main.c
View File

@ -970,6 +970,21 @@ typedef enum {
PARAM_LAST
} ParameterError;
static void cleanarg(char *str)
{
#ifdef HAVE_WRITABLE_ARGV
/* now that GetStr has copied the contents of nextarg, wipe the next
* argument out so that the username:password isn't displayed in the
* system process list */
if (str) {
size_t len = strlen(str);
memset(str, ' ', len);
}
#else
(void)str;
#endif
}
static ParameterError getparameter(char *flag, /* f or -long-flag */
char *nextarg, /* NULL if unset */
bool *usedarg, /* set to TRUE if the arg
@ -1398,6 +1413,7 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
break;
case 'e': /* private key passphrase */
GetStr(&config->key_passwd, nextarg);
cleanarg(nextarg);
break;
case 'f': /* crypto engine */
GetStr(&config->engine, nextarg);
@ -1432,6 +1448,7 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
GetStr(&config->key_passwd, ptr);
}
GetStr(&config->cert, nextarg);
cleanarg(nextarg);
}
}
break;
@ -1627,10 +1644,12 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
case 'u':
/* user:password */
GetStr(&config->userpwd, nextarg);
cleanarg(nextarg);
break;
case 'U':
/* Proxy user:password */
GetStr(&config->proxyuserpwd, nextarg);
cleanarg(nextarg);
break;
case 'v':
config->conf ^= CONF_VERBOSE; /* talk a lot */