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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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63
tests/server/test_server/default_cb.c
View File

@@ -172,6 +172,65 @@ null_userdata:
return SSH_AUTH_DENIED;
}
static int kbdint_check_response(ssh_session session, struct session_data_st *sdata)
{
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(sdata->username, answer);
if (cmp != 0) {
return 0;
}
answer = ssh_userauth_kbdint_getanswer(session, 1);
cmp = strcmp(sdata->password, answer);
if (cmp != 0) {
return 0;
}
return 1;
}
static int
auth_kbdint_cb(ssh_message message, ssh_session session, void *userdata)
{
struct session_data_st *sdata = (struct session_data_st *)userdata;
const char *name = "\n\nKeyboard-Interactive Fancy Authentication\n";
const char *instruction = "Get yourself authenticated";
const char *prompts[2] = {"Username: ", "Password: "};
char echo[] = {1, 0};
if (sdata == NULL) {
fprintf(stderr, "Error: NULL userdata\n");
return SSH_AUTH_DENIED;
}
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)) {
sdata->authenticated = 1;
return SSH_AUTH_SUCCESS;
}
}
return SSH_AUTH_DENIED;
}
#if WITH_GSSAPI
int auth_gssapi_mic_cb(ssh_session session,
UNUSED_PARAM(const char *user),
@@ -783,6 +842,7 @@ struct ssh_server_callbacks_struct *get_default_server_cb(void)
cb->auth_password_function = auth_password_cb;
cb->auth_pubkey_function = auth_pubkey_cb;
cb->channel_open_request_session_function = channel_new_session_cb;
cb->auth_kbdint_function = auth_kbdint_cb;
#if WITH_GSSAPI
cb->auth_gssapi_mic_function = auth_gssapi_mic_cb;
#endif
@@ -912,7 +972,8 @@ void default_handle_session_cb(ssh_event event,
} else {
ssh_set_auth_methods(session,
SSH_AUTH_METHOD_PASSWORD |
SSH_AUTH_METHOD_PUBLICKEY|
SSH_AUTH_METHOD_PUBLICKEY |
SSH_AUTH_METHOD_INTERACTIVE |
SSH_AUTH_METHOD_GSSAPI_MIC);
}

1
tests/server/test_server/main.c
View File

@@ -276,6 +276,7 @@ static int init_server_state(struct server_state_st *state,
} else {
state->auth_methods = SSH_AUTH_METHOD_PASSWORD |
SSH_AUTH_METHOD_PUBLICKEY |
SSH_AUTH_METHOD_INTERACTIVE |
SSH_AUTH_METHOD_GSSAPI_MIC;
}