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Add Keyboard Interactive

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Signed-off-by: anshul agrawal <anshulagrawal2902@gmail.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
This commit is contained in:
anshul agrawal
2026-01-06 22:56:44 +05:30
parent 06186279a8
commit 3f0007895c
7 changed files with 238 additions and 3 deletions
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57
examples/ssh_server.c
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@@ -631,6 +631,58 @@ auth_publickey(ssh_session session,
return SSH_AUTH_DENIED;
}
static int kbdint_check_response(ssh_session session)
{
int count, cmp;
const char *answer = NULL;
count = ssh_userauth_kbdint_getnanswers(session);
if (count != 2) {
return 0;
}
answer = ssh_userauth_kbdint_getanswer(session, 0);
cmp = strcasecmp("omnitrix", answer);
if (cmp != 0) {
return 0;
}
answer = ssh_userauth_kbdint_getanswer(session, 1);
cmp = strcmp("000", answer);
if (cmp != 0) {
return 0;
}
return 1;
}
static int
auth_kbdint(ssh_message message, ssh_session session, void *userdata)
{
struct session_data_struct *sdata = (struct session_data_struct *)userdata;
const char *name = "\n\nKeyboard-Interactive Fancy Authentication\n";
const char *instruction = "Most powerful weapon in the galaxy";
const char *prompts[2] = {"Name of the weapon: ", "Destruct Code: "};
char echo[] = {1, 0};
if (!ssh_message_auth_kbdint_is_response(message)) {
printf("User %s wants to auth with kbdint\n",
ssh_message_auth_user(message));
ssh_message_auth_interactive_request(message,
name,
instruction,
2,
prompts,
echo);
return SSH_AUTH_INFO;
} else {
if (kbdint_check_response(session)) {
sdata->authenticated = 1;
return SSH_AUTH_SUCCESS;
}
return SSH_AUTH_DENIED;
}
}
static ssh_channel
channel_open(ssh_session session, void *userdata)
{
@@ -720,14 +772,15 @@ handle_session(ssh_event event, ssh_session session)
struct ssh_server_callbacks_struct server_cb = {
.userdata = &sdata,
.auth_password_function = auth_password,
.auth_kbdint_function = auth_kbdint,
.channel_open_request_session_function = channel_open,
};
if (authorizedkeys[0]) {
server_cb.auth_pubkey_function = auth_publickey;
ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_PUBLICKEY);
ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_PUBLICKEY | SSH_AUTH_METHOD_INTERACTIVE);
} else
ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD);
ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_INTERACTIVE);
ssh_callbacks_init(&server_cb);
ssh_callbacks_init(&channel_cb);