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PAM kbdint code. Based on fix from Matthew Melvin <matthewm@webcentral.com.au>
159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
#include "includes.h"
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RCSID("$Id: auth2-pam.c,v 1.11 2001/06/27 05:36:44 djm Exp $");
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#ifdef USE_PAM
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#include <security/pam_appl.h>
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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 "auth-pam.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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#include "log.h"
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static int do_pam_conversation_kbd_int(int num_msg,
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const struct pam_message **msg, struct pam_response **resp,
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void *appdata_ptr);
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void input_userauth_info_response_pam(int type, int plen, void *ctxt);
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struct {
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int finished, num_received, num_expected;
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int *prompts;
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struct pam_response *responses;
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} context_pam2 = {0, 0, 0, NULL};
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static struct pam_conv conv2 = {
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do_pam_conversation_kbd_int,
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NULL,
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};
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int
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auth2_pam(Authctxt *authctxt)
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{
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int retval = -1;
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if (authctxt->user == NULL)
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fatal("auth2_pam: internal error: no user");
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conv2.appdata_ptr = authctxt;
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do_pam_set_conv(&conv2);
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
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&input_userauth_info_response_pam);
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retval = (do_pam_authenticate(0) == PAM_SUCCESS);
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
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return retval;
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}
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static int
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do_pam_conversation_kbd_int(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, void *appdata_ptr)
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{
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int i, j, done;
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char *text;
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context_pam2.finished = 0;
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context_pam2.num_received = 0;
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context_pam2.num_expected = 0;
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context_pam2.prompts = xmalloc(sizeof(int) * num_msg);
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context_pam2.responses = xmalloc(sizeof(struct pam_response) * num_msg);
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memset(context_pam2.responses, 0, sizeof(struct pam_response) * num_msg);
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text = NULL;
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for (i = 0, context_pam2.num_expected = 0; i < num_msg; i++) {
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int style = PAM_MSG_MEMBER(msg, i, msg_style);
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switch (style) {
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case PAM_PROMPT_ECHO_ON:
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case PAM_PROMPT_ECHO_OFF:
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context_pam2.num_expected++;
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break;
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case PAM_TEXT_INFO:
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case PAM_ERROR_MSG:
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default:
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/* Capture all these messages to be sent at once */
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message_cat(&text, PAM_MSG_MEMBER(msg, i, msg));
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break;
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}
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}
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if (context_pam2.num_expected == 0)
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return PAM_SUCCESS;
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packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
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packet_put_cstring(""); /* Name */
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packet_put_cstring(""); /* Instructions */
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packet_put_cstring(""); /* Language */
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packet_put_int(context_pam2.num_expected);
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for (i = 0, j = 0; i < num_msg; i++) {
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int style = PAM_MSG_MEMBER(msg, i, msg_style);
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/* Skip messages which don't need a reply */
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if (style != PAM_PROMPT_ECHO_ON && style != PAM_PROMPT_ECHO_OFF)
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continue;
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context_pam2.prompts[j++] = i;
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if (text) {
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message_cat(&text, PAM_MSG_MEMBER(msg, i, msg));
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packet_put_cstring(text);
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text = NULL;
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} else
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packet_put_cstring(PAM_MSG_MEMBER(msg, i, msg));
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packet_put_char(style == PAM_PROMPT_ECHO_ON);
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}
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packet_send();
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packet_write_wait();
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/*
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* Grabbing control of execution and spinning until we get what
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* we want is probably rude, but it seems to work properly, and
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* the client *should* be in lock-step with us, so the loop should
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* only be traversed once.
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*/
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while(context_pam2.finished == 0) {
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done = 1;
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dispatch_run(DISPATCH_BLOCK, &done, appdata_ptr);
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if(context_pam2.finished == 0)
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debug("extra packet during conversation");
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}
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if(context_pam2.num_received == context_pam2.num_expected) {
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*resp = context_pam2.responses;
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return PAM_SUCCESS;
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} else
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return PAM_CONV_ERR;
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}
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void
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input_userauth_info_response_pam(int type, int plen, void *ctxt)
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{
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Authctxt *authctxt = ctxt;
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unsigned int nresp = 0, rlen = 0, i = 0;
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char *resp;
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if (authctxt == NULL)
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fatal("input_userauth_info_response_pam: no authentication context");
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nresp = packet_get_int(); /* Number of responses. */
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debug("got %d responses", nresp);
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for (i = 0; i < nresp; i++) {
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int j = context_pam2.prompts[i];
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resp = packet_get_string(&rlen);
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context_pam2.responses[j].resp_retcode = PAM_SUCCESS;
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context_pam2.responses[j].resp = xstrdup(resp);
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xfree(resp);
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context_pam2.num_received++;
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}
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context_pam2.finished = 1;
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packet_done();
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}
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#endif
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