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endpoints-login.c
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endpoints-login.c
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/*
* Copyright (c) 2014 LastPass. All Rights Reserved.
*
*
*/
#include "endpoints.h"
#include "http.h"
#include "xml.h"
#include "password.h"
#include "config.h"
#include "util.h"
#include "upload-queue.h"
#include "version.h"
#include "terminal.h"
#include <sys/utsname.h>
#include <string.h>
struct multifactor_type {
const char *name;
const char *error_str;
const char *error_failure_str;
const char *post_var;
};
static struct multifactor_type multifactor_types[] = {
{
.name = "Google Authenticator Code",
.error_str = "googleauthrequired",
.error_failure_str = "googleauthfailed",
.post_var = "otp"
},
{
.name = "Yubikey OTP",
.error_str = "otprequired",
.error_failure_str = "otpfailed",
.post_var = "otp"
},
{
.name = "Sesame OTP",
.error_str = "sesameotprequired",
.error_failure_str = "sesameotpfailed",
.post_var = "sesameotp"
},
{
.name = "Out-of-Band OTP",
.error_str = "outofbandrequired",
.error_failure_str = "multifactorresponsefailed",
.post_var = "otp"
}
};
static void filter_error_message(char *message)
{
char *nullit;
nullit = strstr(message, " Upgrade your browser extension so you can enter it.");
if (nullit)
*nullit = '\0';
}
static inline void append_post(char **args, const char *name, const char *val)
{
char **last = args;
while (*last && strcmp(*last, name))
++last;
*last = (char *)name;
*(last + 1) = (char *)val;
}
static char *calculate_trust_id(bool force)
{
char *trusted_id;
trusted_id = config_read_string("trusted_id");
if (force && !trusted_id) {
trusted_id = xcalloc(33, 1);
for (size_t i = 0; i < 32; ++i)
trusted_id[i] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$"[range_rand(0, 66)];
config_write_string("trusted_id", trusted_id);
}
return trusted_id;
}
static char *calculate_trust_label(void)
{
char *trusted_label;
struct utsname utsname;
if (uname(&utsname) < 0)
die_errno("Failed to determine uname.");
xasprintf(&trusted_label, "%s - %s %s", utsname.nodename, utsname.sysname, utsname.release);
return trusted_label;
}
static bool error_post(char **message, struct session **session)
{
*session = NULL;
if (message)
*message = xstrdup("Unable to post login request.");
return true;
}
static bool error_other(char **message, struct session **session, const char *txt)
{
*session = NULL;
if (message)
*message = xstrdup(txt);
return true;
}
static bool error_message(char **message, struct session **session, const char *reply)
{
*session = NULL;
if (message) {
*message = xml_error_cause(reply, "message");
if (*message)
filter_error_message(*message);
else
*message = xstrdup("Could not parse error message to login request.");
}
return true;
}
static bool ordinary_login(const unsigned char key[KDF_HASH_LEN], char **args, char **cause, char **message, char **reply, struct session **session)
{
free(*reply);
*reply = http_post_lastpass_v("login.php", NULL, NULL, args);
if (!*reply)
return error_post(message, session);
*session = xml_ok_session(*reply, key);
if (*session)
return true;
*cause = xml_error_cause(*reply, "cause");
if (!*cause)
return error_other(message, session, "Unable to determine login failure cause.");
return false;
}
static inline bool has_capabilities(const char *capabilities, const char *capability)
{
_cleanup_free_ char *caps = xstrdup(capabilities);
char *token;
for (token = strtok(caps, ","); token; token = strtok(NULL, ",")) {
if (!strcmp(capability, token))
return true;
}
return false;
}
static bool oob_login(const unsigned char key[KDF_HASH_LEN], char **args, char **message, char **reply, char **oob_name, struct session **session)
{
_cleanup_free_ char *oob_capabilities = NULL;
_cleanup_free_ char *cause = NULL;
_cleanup_free_ char *retryid = NULL;
bool can_do_passcode;
bool ret;
*oob_name = xml_error_cause(*reply, "outofbandname");
oob_capabilities = xml_error_cause(*reply, "capabilities");
if (!*oob_name || !oob_capabilities)
return error_other(message, session, "Could not determine out-of-band type.");
can_do_passcode = has_capabilities(oob_capabilities, "passcode");
terminal_fprintf(stderr, TERMINAL_FG_YELLOW TERMINAL_BOLD "Waiting for approval of out-of-band %s login%s" TERMINAL_NO_BOLD "...", *oob_name, can_do_passcode ? ", or press Ctrl+C to enter a passcode" : "");
append_post(args, "outofbandrequest", "1");
for (;;) {
free(*reply);
*reply = http_post_lastpass_v("login.php", NULL, NULL, args);
if (!*reply) {
if (can_do_passcode) {
append_post(args, "outofbandrequest", "0");
append_post(args, "outofbandretry", "0");
append_post(args, "outofbandretryid", "");
xstrappend(oob_name, " OTP");
goto failure;
} else {
error_post(message, session);
goto success;
}
}
*session = xml_ok_session(*reply, key);
if (*session)
goto success;
free(cause);
cause = xml_error_cause(*reply, "cause");
if (cause && !strcmp(cause, "outofbandrequired")) {
free(retryid);
retryid = xml_error_cause(*reply, "retryid");
append_post(args, "outofbandretry", "1");
append_post(args, "outofbandretryid", retryid);
fprintf(stderr, ".");
continue;
}
error_message(message, session, *reply);
goto success;
}
success:
ret = true;
goto out;
failure:
ret = false;
goto out;
out:
terminal_fprintf(stderr, TERMINAL_RESET "\n" TERMINAL_UP_CURSOR(1) TERMINAL_CLEAR_DOWN);
return ret;
}
static bool otp_login(const unsigned char key[KDF_HASH_LEN], char **args, char **message, char **reply, const char *otp_name, const char *cause, const char *username, struct session **session)
{
struct multifactor_type *replied_multifactor = NULL;
_cleanup_free_ char *multifactor = NULL;
_cleanup_free_ char *next_cause = NULL;
char *multifactor_error = NULL;
for (size_t i = 0; i < ARRAY_SIZE(multifactor_types); ++i) {
if (!strcmp(multifactor_types[i].error_str, cause)) {
replied_multifactor = &multifactor_types[i];
break;
}
}
if (!replied_multifactor)
return error_message(message, session, *reply);
for (;;) {
free(multifactor);
multifactor = password_prompt("Code", multifactor_error, "Please enter your %s for <%s>.", otp_name ? otp_name : replied_multifactor->name, username);
if (!multifactor)
return error_other(message, session, "Aborted multifactor authentication.");
append_post(args, replied_multifactor->post_var, multifactor);
free(*reply);
*reply = http_post_lastpass_v("login.php", NULL, NULL, args);
if (!*reply)
return error_post(message, session);
*session = xml_ok_session(*reply, key);
if (*session)
return true;
free(next_cause);
next_cause = xml_error_cause(*reply, "cause");
if (next_cause && !strcmp(next_cause, replied_multifactor->error_failure_str))
multifactor_error = "Invalid multifactor code; please try again.";
else
return error_message(message, session, *reply);
}
}
struct session *lastpass_login(const char *username, const char hash[KDF_HEX_LEN], const unsigned char key[KDF_HASH_LEN], int iterations, char **error_message, bool trust)
{
char *args[33];
_cleanup_free_ char *user_lower = NULL;
_cleanup_free_ char *iters = NULL;
_cleanup_free_ char *trusted_id = NULL;
_cleanup_free_ char *trusted_label = NULL;
_cleanup_free_ char *cause = NULL;
_cleanup_free_ char *reply = NULL;
_cleanup_free_ char *otp_name = NULL;
struct session *session = NULL;
iters = xultostr(iterations);
user_lower = xstrlower(username);
trusted_id = calculate_trust_id(trust);
memset(args, 0, sizeof(args));
append_post(args, "xml", "2");
append_post(args, "username", user_lower);
append_post(args, "hash", hash);
append_post(args, "iterations", iters);
append_post(args, "includeprivatekeyenc", "1");
append_post(args, "method", "cli");
append_post(args, "outofbandsupported", "1");
if (trusted_id)
append_post(args, "uuid", trusted_id);
if (ordinary_login(key, args, &cause, error_message, &reply, &session))
return session;
if (trust) {
trusted_label = calculate_trust_label();
append_post(args, "trustlabel", trusted_label);
}
if (!strcmp(cause, "outofbandrequired") && oob_login(key, args, error_message, &reply, &otp_name, &session)) {
if (trust)
http_post_lastpass("trust.php", session->sessionid, NULL, "uuid", trusted_id, "trustlabel", trusted_label, NULL);
return session;
}
if (otp_login(key, args, error_message, &reply, otp_name, cause, user_lower, &session))
return session;
error_other(error_message, &session, "An unspecified error occured.");
return NULL;
}