- /*
- * If we received a preferred mechanism, see if the server supports it.
- */
-
- if (mech && stringdex(mech, server_mechs) == -1) {
- snprintf(response, sizeof(response), "Requested SASL mech \"%s\" is "
- "not in list of supported mechanisms:\n%s",
- mech, server_mechs);
- return NOTOK;
- }
-
- /*
- * Start the SASL process. First off, initialize the SASL library.
- */
-
- callbacks[POP_SASL_CB_N_USER].context = user;
- p_context.user = user;
- p_context.host = host;
- callbacks[POP_SASL_CB_N_PASS].context = &p_context;
-
- result = sasl_client_init(callbacks);
-
- if (result != SASL_OK) {
- snprintf(response, sizeof(response), "SASL library initialization "
- "failed: %s", sasl_errstring(result, NULL, NULL));
- return NOTOK;
- }
-
- result = sasl_client_new("pop", host, NULL, NULL, NULL, 0, &conn);
-
- if (result != SASL_OK) {
- snprintf(response, sizeof(response), "SASL client initialization "
- "failed: %s", sasl_errstring(result, NULL, NULL));
- return NOTOK;
- }
-
- /*
- * Initialize the security properties
- */
-
- memset(&secprops, 0, sizeof(secprops));
- secprops.maxbufsize = SASL_BUFFER_SIZE;
- secprops.max_ssf = UINT_MAX;
-
- result = sasl_setprop(conn, SASL_SEC_PROPS, &secprops);
-
- if (result != SASL_OK) {
- snprintf(response, sizeof(response), "SASL security property "
- "initialization failed: %s", sasl_errdetail(conn));
- return NOTOK;
- }
-
- /*
- * Start the actual protocol. Feed the mech list into the library
- * and get out a possible initial challenge
- */
-
- result = sasl_client_start(conn,
- (const char *) (mech ? mech : server_mechs),
- NULL, (const char **) &buf,
- &buflen, &chosen_mech);
-
- if (result != SASL_OK && result != SASL_CONTINUE) {
- snprintf(response, sizeof(response), "SASL client start failed: %s",
- sasl_errdetail(conn));
- return NOTOK;
- }
-
- if (buflen) {
- status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
- if (status != SASL_OK) {
- snprintf(response, sizeof(response), "SASL base64 encode "
- "failed: %s", sasl_errstring(status, NULL, NULL));
- return NOTOK;
- }
-
- status = command("AUTH %s %s", chosen_mech, outbuf);
- } else
- status = command("AUTH %s", chosen_mech);
-
- while (result == SASL_CONTINUE) {
- if (status == NOTOK)
- return NOTOK;
-
- /*
- * If we get a "+OK" prefix to our response, then we should
- * exit out of this exchange now (because authenticated should
- * have succeeded)
- */
-
- if (strncmp(response, "+OK", 3) == 0)
- break;
-
- /*
- * Otherwise, make sure the server challenge is correctly formatted
- */
-
- if (strncmp(response, "+ ", 2) != 0) {
- command("*");
- snprintf(response, sizeof(response),
- "Malformed authentication message from server");
- return NOTOK;
- }
-
- result = sasl_decode64(response + 2, strlen(response + 2),
- outbuf, sizeof(outbuf), &outlen);
-
- if (result != SASL_OK) {
- command("*");
- snprintf(response, sizeof(response), "SASL base64 decode "
- "failed: %s", sasl_errstring(result, NULL, NULL));
- return NOTOK;
- }
-
- result = sasl_client_step(conn, outbuf, outlen, NULL,
- (const char **) &buf, &buflen);
-
- if (result != SASL_OK && result != SASL_CONTINUE) {
- command("*");
- snprintf(response, sizeof(response), "SASL client negotiaton "
- "failed: %s", sasl_errdetail(conn));
- return NOTOK;
- }
-
- status = sasl_encode64(buf, buflen, outbuf, sizeof(outbuf), NULL);
-
- if (status != SASL_OK) {
- command("*");
- snprintf(response, sizeof(response), "SASL base64 encode "
- "failed: %s", sasl_errstring(status, NULL, NULL));
- return NOTOK;
- }
-
- status = command(outbuf);
- }
-
- /*
- * If we didn't get a positive final response, then error out
- * (that probably means we failed an authorization check).
- */
-
- if (status != OK)
- return NOTOK;
-
- /*
- * We _should_ be okay now. Get a few properties now that negotiation
- * has completed.
- */
-
- result = sasl_getprop(conn, SASL_MAXOUTBUF, (const void **) &moutbuf);
-
- if (result != SASL_OK) {
- snprintf(response, sizeof(response), "Cannot retrieve SASL negotiated "
- "output buffer size: %s", sasl_errdetail(conn));
- return NOTOK;
- }
-
- maxoutbuf = *moutbuf;
-
- result = sasl_getprop(conn, SASL_SSF, (const void **) &ssf);
-
- sasl_ssf = *ssf;
-
- if (result != SASL_OK) {
- snprintf(response, sizeof(response), "Cannot retrieve SASL negotiated "
- "security strength factor: %s", sasl_errdetail(conn));
- return NOTOK;
- }
-
- /*
- * Limit this to what we can deal with. Shouldn't matter much because
- * this is only outgoing data (which should be small)
- */
-
- if (maxoutbuf == 0 || maxoutbuf > BUFSIZ)
- maxoutbuf = BUFSIZ;
-
- sasl_complete = 1;
-
- return status;
-}
-
-/*
- * Callback to return the userid sent down via the user parameter
- */
-
-static int
-sasl_get_user(void *context, int id, const char **result, unsigned *len)
-{
- char *user = (char *) context;
-
- if (! result || id != SASL_CB_USER)
- return SASL_BADPARAM;
-
- *result = user;
- if (len)
- *len = strlen(user);
-
- return SASL_OK;
-}
-
-/*
- * Callback to return the password (we call ruserpass, which can get it
- * out of the .netrc
- */
-
-static int
-sasl_get_pass(sasl_conn_t *conn, void *context, int id, sasl_secret_t **psecret)
-{
- struct pass_context *p_context = (struct pass_context *) context;
- char *pass = NULL;
- int len;
-
- if (! psecret || id != SASL_CB_PASS)
- return SASL_BADPARAM;
-
- ruserpass(p_context->user, &(p_context->host), &pass);
-
- len = strlen(pass);
-
- *psecret = (sasl_secret_t *) mh_xmalloc(sizeof(sasl_secret_t) + len);
-
- (*psecret)->len = len;
- strcpy((char *) (*psecret)->data, pass);
-
- return SASL_OK;
projects / nmh / blobdiff