Make the ssh_userauth_kbdint functions to get the prompts const.

They shouldn't be modified or free'd by a user.

include/libssh/libssh.h

@@ -370,9 +370,9 @@ int ssh_userauth_agent_pubkey(SSH_SESSION *session, const char *username,
 int ssh_userauth_autopubkey(SSH_SESSION *session, const char *passphrase);
 int ssh_userauth_kbdint(SSH_SESSION *session, const char *user, const char *submethods);
 int ssh_userauth_kbdint_getnprompts(SSH_SESSION *session);
-char *ssh_userauth_kbdint_getname(SSH_SESSION *session);
-char *ssh_userauth_kbdint_getinstruction(SSH_SESSION *session);
-char *ssh_userauth_kbdint_getprompt(SSH_SESSION *session, unsigned int i, char *echo);
+const char *ssh_userauth_kbdint_getname(SSH_SESSION *session);
+const char *ssh_userauth_kbdint_getinstruction(SSH_SESSION *session);
+const char *ssh_userauth_kbdint_getprompt(SSH_SESSION *session, unsigned int i, char *echo);
 int ssh_userauth_kbdint_setanswer(SSH_SESSION *session, unsigned int i,
     const char *answer);
 

libssh/auth.c

@@ -1417,7 +1417,7 @@ int ssh_userauth_kbdint_getnprompts(SSH_SESSION *session) {
  *
  * @returns             The name of the message block. Do not free it.
  */
-char *ssh_userauth_kbdint_getname(SSH_SESSION *session) {
+const char *ssh_userauth_kbdint_getname(SSH_SESSION *session) {
   return session->kbdint->name;
 }
 
@@ -1432,7 +1432,7 @@ char *ssh_userauth_kbdint_getname(SSH_SESSION *session) {
  * @returns             The instruction of the message block.
  */
 
-char *ssh_userauth_kbdint_getinstruction(SSH_SESSION *session) {
+const char *ssh_userauth_kbdint_getinstruction(SSH_SESSION *session) {
   return session->kbdint->instruction;
 }
 
@@ -1452,7 +1452,7 @@ char *ssh_userauth_kbdint_getinstruction(SSH_SESSION *session) {
  *
  * @returns             A pointer to the prompt. Do not free it.
  */
-char *ssh_userauth_kbdint_getprompt(SSH_SESSION *session, unsigned int i,
+const char *ssh_userauth_kbdint_getprompt(SSH_SESSION *session, unsigned int i,
     char *echo) {
   if (i > session->kbdint->nprompts) {
     return NULL;

sample.c

@@ -367,7 +367,8 @@ void do_sftp(SSH_SESSION *session){
 
 static int auth_kbdint(SSH_SESSION *session){
     int err=ssh_userauth_kbdint(session,NULL,NULL);
-    char *name,*instruction,*prompt,*ptr;
+    const char *name, *instruction, *prompt;
+    char *ptr;
     char buffer[128];
     int i,n;
     char echo;