105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
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#include "includes.h"
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RCSID("$OpenBSD: auth2-skey.c,v 1.1 2000/10/11 20:14:38 markus Exp $");
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#include "ssh.h"
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#include "ssh2.h"
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#include "auth.h"
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#include "packet.h"
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#include "xmalloc.h"
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#include "dispatch.h"
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void send_userauth_into_request(Authctxt *authctxt, int echo);
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void input_userauth_info_response(int type, int plen, void *ctxt);
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/*
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* try skey authentication, always return -1 (= postponed) since we have to
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* wait for the s/key response.
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*/
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int
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auth2_skey(Authctxt *authctxt)
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{
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send_userauth_into_request(authctxt, 0);
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, &input_userauth_info_response);
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return -1;
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}
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void
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send_userauth_into_request(Authctxt *authctxt, int echo)
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{
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int retval = -1;
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struct skey skey;
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char challenge[SKEY_MAX_CHALLENGE];
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char *fake;
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if (authctxt->user == NULL)
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fatal("send_userauth_into_request: internal error: no user");
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/* get skey challenge */
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if (authctxt->valid)
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retval = skeychallenge(&skey, authctxt->user, challenge);
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if (retval == -1) {
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fake = skey_fake_keyinfo(authctxt->user);
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strlcpy(challenge, fake, sizeof challenge);
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}
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/* send our info request */
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packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
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packet_put_cstring("S/Key Authentication"); /* Name */
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packet_put_cstring(challenge); /* Instruction */
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packet_put_cstring(""); /* Language */
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packet_put_int(1); /* Number of prompts */
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packet_put_cstring(echo ?
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"Response [Echo]: ": "Response: "); /* Prompt */
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packet_put_char(echo); /* Echo */
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packet_send();
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packet_write_wait();
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memset(challenge, 'c', sizeof challenge);
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}
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void
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input_userauth_info_response(int type, int plen, void *ctxt)
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{
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Authctxt *authctxt = ctxt;
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int authenticated = 0;
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unsigned int nresp, rlen;
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char *resp, *method;
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if (authctxt == NULL)
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fatal("input_userauth_info_response: no authentication context");
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if (authctxt->attempt++ >= AUTH_FAIL_MAX)
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packet_disconnect("too many failed userauth_requests");
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nresp = packet_get_int();
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if (nresp == 1) {
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/* we only support s/key and assume s/key for nresp == 1 */
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method = "s/key";
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resp = packet_get_string(&rlen);
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packet_done();
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if (strlen(resp) == 0) {
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/*
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* if we received a null response, resend prompt with
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* echo enabled
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*/
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authenticated = -1;
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userauth_log(authctxt, authenticated, method);
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send_userauth_into_request(authctxt, 1);
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} else {
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/* verify skey response */
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if (authctxt->valid &&
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skey_haskey(authctxt->pw->pw_name) == 0 &&
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skey_passcheck(authctxt->pw->pw_name, resp) != -1) {
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authenticated = 1;
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} else {
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authenticated = 0;
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}
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memset(resp, 'r', rlen);
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/* unregister callback */
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
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userauth_log(authctxt, authenticated, method);
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userauth_reply(authctxt, authenticated);
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}
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xfree(resp);
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}
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}
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