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660f875a3463df23494126be95fabe19cad96849
heimdal/kdc/httpkadmind.c
Nicolas Williams 5f63215d0d Always perform == or != operation on cmp function result 
Although not required to address bad code generation in
some versions of gcc 9 and 10, a coding style that requires
explicit comparison of the result to zero before use is
both clearer and would have avoided the generation of bad
code.

This change converts all use of cmp function usage from

```
    if (strcmp(a, b) || !strcmp(c, d)) ...
```

to

```
    if (strcmp(a, b) != 0 || strcmp(c, d)) == 0
```

for all C library cmp functions and related:

 - strcmp(), strncmp()
 - strcasecmp(), strncasecmp()
 - stricmp(), strnicmp()
 - memcmp()

Change-Id: Ic60c15e1e3a07e4faaf10648eefe3adae2543188
2021-11-24 22:30:44 -05:00

2313 lines
76 KiB
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/*
* Copyright (c) 2020 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
*/
#define _XOPEN_SOURCE_EXTENDED 1
#define _DEFAULT_SOURCE 1
#define _BSD_SOURCE 1
#define _GNU_SOURCE 1
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <ctype.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <microhttpd.h>
#include "kdc_locl.h"
#include "token_validator_plugin.h"
#include <getarg.h>
#include <roken.h>
#include <krb5.h>
#include <gssapi/gssapi.h>
#include <gssapi/gssapi_krb5.h>
#include <hx509.h>
#include "../lib/hx509/hx_locl.h"
#include <hx509-private.h>
#include <kadm5/admin.h>
#include <kadm5/private.h>
#include <kadm5/kadm5_err.h>
#define heim_pcontext krb5_context
#define heim_pconfig krb5_context
#include <heimbase-svc.h>
#define BODYLEN_IS_STRLEN (~0)
/*
* Libmicrohttpd is not the easiest API to use. It's got issues.
*
* One of the issues is how responses are handled, and the return value of the
* resource handler (MHD_NO -> close the connection, MHD_YES -> send response).
* Note that the handler could return MHD_YES without having set an HTTP
* response.
*
* There's memory management issues as well.
*
* Here we have to be careful about return values.
*
* Some of the functions defined here return just a krb5_error_code without
* having set an HTTP response on error.
* Others do set an HTTP response on error.
* The convention is to either set an HTTP response on error, or not at all,
* but not a mix of errors where for some the function will set a response and
* for others it won't.
*
* We do use some system error codes to stand in for errors here.
* Specifically:
*
* - EACCES -> authorization failed
* - EINVAL -> bad API usage
* - ENOSYS -> missing CSRF token but CSRF token required
*
* FIXME: We should rely only on krb5_set_error_message() and friends and make
* error responses only in route(), mapping krb5_error_code values to
* HTTP status codes. This would simplify the error handling convention
* here.
*/
/* Our request description structure */
typedef struct kadmin_request_desc {
HEIM_SVC_REQUEST_DESC_COMMON_ELEMENTS;
struct MHD_Connection *connection;
krb5_error_code ret;
krb5_times token_times;
/*
* FIXME
*
* Currently we re-use the authz framework from bx509d, using an
* `hx509_request' instance (an abstraction for CSRs) to represent the
* request because that is what the authz plugin uses that implements the
* policy we want checked here.
*
* This is inappropriate in the long-term in two ways:
*
* - the policy for certificates deals in SANs and EKUs, whereas the
* policy for ext_keytab deals in host-based service principal names,
* and there is not a one-to-one mapping of service names to EKUs;
*
* - using a type from libhx509 for representing requests for things that
* aren't certificates is really not appropriate no matter how similar
* the use cases for this all might be.
*
* What we need to do is develop a library that can represent requests for
* credentials via naming attributes like SANs and Kerberos principal
* names, but more arbitrary still than what `hx509_request' supports, and
* then invokes a plugin.
*
* Also, we might want to develop an in-tree authorization solution that is
* richer than what kadmin.acl supports now, storing grants in HDB entries
* and/or similar places.
*
* For expediency we use `hx509_request' here for now, impedance mismatches
* be damned.
*/
hx509_request req; /* For authz only */
heim_array_t service_names;
heim_array_t hostnames;
heim_array_t spns;
krb5_principal cprinc;
krb5_keytab keytab;
krb5_storage *sp;
void *kadm_handle;
char *realm;
char *keytab_name;
char *freeme1;
char *enctypes;
const char *method;
unsigned int response_set:1;
unsigned int materialize:1;
unsigned int rotate_now:1;
unsigned int rotate:1;
unsigned int revoke:1;
unsigned int create:1;
unsigned int ro:1;
unsigned int is_self:1;
char frombuf[128];
} *kadmin_request_desc;
static void
audit_trail(kadmin_request_desc r, krb5_error_code ret)
{
const char *retname = NULL;
/*
* Get a symbolic name for some error codes.
*
* Really, libcom_err should have a primitive for this, and ours could, but
* we can't use a system libcom_err if we extend ours.
*/
#define CASE(x) case x : retname = #x; break
switch (ret) {
case ENOSYS: retname = "ECSRFTOKENREQD"; break;
CASE(EINVAL);
CASE(ENOMEM);
CASE(EACCES);
CASE(HDB_ERR_NOT_FOUND_HERE);
CASE(HDB_ERR_WRONG_REALM);
CASE(HDB_ERR_EXISTS);
CASE(HDB_ERR_KVNO_NOT_FOUND);
CASE(HDB_ERR_NOENTRY);
CASE(HDB_ERR_NO_MKEY);
CASE(KRB5_KDC_UNREACH);
CASE(KADM5_FAILURE);
CASE(KADM5_AUTH_GET);
CASE(KADM5_AUTH_ADD);
CASE(KADM5_AUTH_MODIFY);
CASE(KADM5_AUTH_DELETE);
CASE(KADM5_AUTH_INSUFFICIENT);
CASE(KADM5_BAD_DB);
CASE(KADM5_DUP);
CASE(KADM5_RPC_ERROR);
CASE(KADM5_NO_SRV);
CASE(KADM5_BAD_HIST_KEY);
CASE(KADM5_NOT_INIT);
CASE(KADM5_UNK_PRINC);
CASE(KADM5_UNK_POLICY);
CASE(KADM5_BAD_MASK);
CASE(KADM5_BAD_CLASS);
CASE(KADM5_BAD_LENGTH);
CASE(KADM5_BAD_POLICY);
CASE(KADM5_BAD_PRINCIPAL);
CASE(KADM5_BAD_AUX_ATTR);
CASE(KADM5_BAD_HISTORY);
CASE(KADM5_BAD_MIN_PASS_LIFE);
CASE(KADM5_PASS_Q_TOOSHORT);
CASE(KADM5_PASS_Q_CLASS);
CASE(KADM5_PASS_Q_DICT);
CASE(KADM5_PASS_REUSE);
CASE(KADM5_PASS_TOOSOON);
CASE(KADM5_POLICY_REF);
CASE(KADM5_INIT);
CASE(KADM5_BAD_PASSWORD);
CASE(KADM5_PROTECT_PRINCIPAL);
CASE(KADM5_BAD_SERVER_HANDLE);
CASE(KADM5_BAD_STRUCT_VERSION);
CASE(KADM5_OLD_STRUCT_VERSION);
CASE(KADM5_NEW_STRUCT_VERSION);
CASE(KADM5_BAD_API_VERSION);
CASE(KADM5_OLD_LIB_API_VERSION);
CASE(KADM5_OLD_SERVER_API_VERSION);
CASE(KADM5_NEW_LIB_API_VERSION);
CASE(KADM5_NEW_SERVER_API_VERSION);
CASE(KADM5_SECURE_PRINC_MISSING);
CASE(KADM5_NO_RENAME_SALT);
CASE(KADM5_BAD_CLIENT_PARAMS);
CASE(KADM5_BAD_SERVER_PARAMS);
CASE(KADM5_AUTH_LIST);
CASE(KADM5_AUTH_CHANGEPW);
CASE(KADM5_BAD_TL_TYPE);
CASE(KADM5_MISSING_CONF_PARAMS);
CASE(KADM5_BAD_SERVER_NAME);
CASE(KADM5_KS_TUPLE_NOSUPP);
CASE(KADM5_SETKEY3_ETYPE_MISMATCH);
CASE(KADM5_DECRYPT_USAGE_NOSUPP);
CASE(KADM5_POLICY_OP_NOSUPP);
CASE(KADM5_KEEPOLD_NOSUPP);
CASE(KADM5_AUTH_GET_KEYS);
CASE(KADM5_ALREADY_LOCKED);
CASE(KADM5_NOT_LOCKED);
CASE(KADM5_LOG_CORRUPT);
CASE(KADM5_LOG_NEEDS_UPGRADE);
CASE(KADM5_BAD_SERVER_HOOK);
CASE(KADM5_SERVER_HOOK_NOT_FOUND);
CASE(KADM5_OLD_SERVER_HOOK_VERSION);
CASE(KADM5_NEW_SERVER_HOOK_VERSION);
CASE(KADM5_READ_ONLY);
case 0:
retname = "SUCCESS";
break;
default:
retname = NULL;
break;
}
heim_audit_trail((heim_svc_req_desc)r, ret, retname);
}
static krb5_log_facility *logfac;
static pthread_key_t k5ctx;
static krb5_error_code
get_krb5_context(krb5_context *contextp)
{
krb5_error_code ret;
if ((*contextp = pthread_getspecific(k5ctx)))
return 0;
ret = krb5_init_context(contextp);
/* XXX krb5_set_log_dest(), warn_dest, debug_dest */
if (ret == 0)
(void) pthread_setspecific(k5ctx, *contextp);
return ret;
}
static int port = -1;
static int help_flag;
static int daemonize;
static int daemon_child_fd = -1;
static int local_hdb;
static int local_hdb_read_only;
static int read_only;
static int verbose_counter;
static int version_flag;
static int reverse_proxied_flag;
static int thread_per_client_flag;
struct getarg_strings audiences;
static const char *cert_file;
static const char *priv_key_file;
static const char *cache_dir;
static const char *realm;
static const char *hdb;
static const char *primary_server_URI;
static const char *kadmin_server;
static const char *writable_kadmin_server;
static const char *stash_file;
static const char *kadmin_client_name = "httpkadmind/admin";
static const char *kadmin_client_keytab;
static struct getarg_strings auth_types;
#define set_conf(c, f, v, b) \
if (v) { \
if (((c).f = strdup(v)) == NULL) \
goto enomem; \
conf.mask |= b; \
}
/*
* Does NOT set an HTTP response, naturally, as it doesn't even have access to
* the connection.
*/
static krb5_error_code
get_kadm_handle(krb5_context context,
const char *want_realm,
int want_write,
void **kadm_handle)
{
kadm5_config_params conf;
krb5_error_code ret;
/*
* If the caller wants to write and we are configured to redirect in that
* case, then trigger a redirect by returning KADM5_READ_ONLY.
*/
if (want_write && local_hdb_read_only && primary_server_URI)
return KADM5_READ_ONLY;
if (want_write && read_only)
return KADM5_READ_ONLY;
/*
* Configure kadm5 connection.
*
* Note that all of these are optional, and will be found in krb5.conf or,
* in some cases, in DNS, as needed.
*/
memset(&conf, 0, sizeof(conf));
conf.realm = NULL;
conf.dbname = NULL;
conf.stash_file = NULL;
conf.admin_server = NULL;
conf.readonly_admin_server = NULL;
set_conf(conf, realm, want_realm, KADM5_CONFIG_REALM);
set_conf(conf, dbname, hdb, KADM5_CONFIG_DBNAME);
set_conf(conf, stash_file, stash_file, KADM5_CONFIG_STASH_FILE);
set_conf(conf, admin_server, writable_kadmin_server, KADM5_CONFIG_ADMIN_SERVER);
set_conf(conf, readonly_admin_server, kadmin_server,
KADM5_CONFIG_READONLY_ADMIN_SERVER);
/*
* If we have a local HDB we'll use it if we can. If the local HDB is
* read-only and the caller wants to write, then we won't use the local
* HDB, naturally.
*/
if (local_hdb && (!local_hdb_read_only || !want_write)) {
ret = kadm5_s_init_with_password_ctx(context,
kadmin_client_name,
NULL, /* password */
NULL, /* service_name */
&conf,
0, /* struct_version */
0, /* api_version */
kadm_handle);
goto out;
}
/*
* Remote connection. This will connect to a read-only kadmind if
* possible, and if so, reconnect to a writable kadmind as needed.
*
* Note that kadmin_client_keytab can be an HDB: or HDBGET: keytab.
*/
ret = kadm5_c_init_with_skey_ctx(context,
kadmin_client_name,
kadmin_client_keytab,
KADM5_ADMIN_SERVICE,
&conf,
0, /* struct_version */
0, /* api_version */
kadm_handle);
goto out;
enomem:
ret = krb5_enomem(context);
out:
free(conf.readonly_admin_server);
free(conf.admin_server);
free(conf.stash_file);
free(conf.dbname);
free(conf.realm);
return ret;
}
static krb5_error_code resp(kadmin_request_desc, int, krb5_error_code,
enum MHD_ResponseMemoryMode, const char *,
const void *, size_t, const char *, const char *);
static krb5_error_code bad_req(kadmin_request_desc, krb5_error_code, int,
const char *, ...)
HEIMDAL_PRINTF_ATTRIBUTE((__printf__, 4, 5));
static krb5_error_code bad_enomem(kadmin_request_desc, krb5_error_code);
static krb5_error_code bad_400(kadmin_request_desc, krb5_error_code, const char *);
static krb5_error_code bad_401(kadmin_request_desc, const char *);
static krb5_error_code bad_403(kadmin_request_desc, krb5_error_code, const char *);
static krb5_error_code bad_404(kadmin_request_desc, const char *);
static krb5_error_code bad_405(kadmin_request_desc, const char *);
/*static krb5_error_code bad_500(kadmin_request_desc, krb5_error_code, const char *);*/
static krb5_error_code bad_503(kadmin_request_desc, krb5_error_code, const char *);
static int
validate_token(kadmin_request_desc r)
{
krb5_error_code ret;
const char *token;
const char *host;
char token_type[64]; /* Plenty */
char *p;
krb5_data tok;
size_t host_len, brk, i;
memset(&r->token_times, 0, sizeof(r->token_times));
host = MHD_lookup_connection_value(r->connection, MHD_HEADER_KIND,
MHD_HTTP_HEADER_HOST);
if (host == NULL)
return bad_400(r, EINVAL, "Host header is missing");
/* Exclude port number here (IPv6-safe because of the below) */
host_len = ((p = strchr(host, ':'))) ? p - host : strlen(host);
token = MHD_lookup_connection_value(r->connection, MHD_HEADER_KIND,
MHD_HTTP_HEADER_AUTHORIZATION);
if (token == NULL)
return bad_401(r, "Authorization token is missing");
brk = strcspn(token, " \t");
if (token[brk] == '\0' || brk > sizeof(token_type) - 1)
return bad_401(r, "Authorization token is missing");
memcpy(token_type, token, brk);
token_type[brk] = '\0';
token += brk + 1;
tok.length = strlen(token);
tok.data = (void *)(uintptr_t)token;
for (i = 0; i < audiences.num_strings; i++)
if (strncasecmp(host, audiences.strings[i], host_len) == 0 &&
audiences.strings[i][host_len] == '\0')
break;
if (i == audiences.num_strings)
return bad_403(r, EINVAL, "Host: value is not accepted here");
r->sname = strdup(host); /* No need to check for ENOMEM here */
ret = kdc_validate_token(r->context, NULL /* realm */, token_type, &tok,
(const char **)&audiences.strings[i], 1,
&r->cprinc, &r->token_times);
if (ret)
return bad_403(r, ret, "Token validation failed");
if (r->cprinc == NULL)
return bad_403(r, ret,
"Could not extract a principal name from token");
ret = krb5_unparse_name(r->context, r->cprinc, &r->cname);
if (ret)
return bad_503(r, ret,
"Could not extract a principal name from token");
return 0;
}
static void
k5_free_context(void *ctx)
{
krb5_free_context(ctx);
}
#ifndef HAVE_UNLINKAT
static int
unlink1file(const char *dname, const char *name)
{
char p[PATH_MAX];
if (strlcpy(p, dname, sizeof(p)) < sizeof(p) &&
strlcat(p, "/", sizeof(p)) < sizeof(p) &&
strlcat(p, name, sizeof(p)) < sizeof(p))
return unlink(p);
return ERANGE;
}
#endif
static void
rm_cache_dir(void)
{
struct dirent *e;
DIR *d;
/*
* This works, but not on Win32:
*
* (void) simple_execlp("rm", "rm", "-rf", cache_dir, NULL);
*
* We make no directories in `cache_dir', so we need not recurse.
*/
if ((d = opendir(cache_dir)) == NULL)
return;
while ((e = readdir(d))) {
#ifdef HAVE_UNLINKAT
/*
* Because unlinkat() takes a directory FD, implementing one for
* libroken is tricky at best. Instead we might want to implement an
* rm_dash_rf() function in lib/roken.
*/
(void) unlinkat(dirfd(d), e->d_name, 0);
#else
(void) unlink1file(cache_dir, e->d_name);
#endif
}
(void) closedir(d);
(void) rmdir(cache_dir);
}
/*
* Work around older libmicrohttpd not strduping response header values when
* set.
*/
static HEIMDAL_THREAD_LOCAL struct redirect_uri {
char uri[4096];
size_t len;
size_t first_param;
int valid;
} redirect_uri;
static void
redirect_uri_appends(struct redirect_uri *redirect,
const char *s)
{
size_t sz, len;
char *p;
if (!redirect->valid || redirect->len >= sizeof(redirect->uri) - 1) {
redirect->valid = 0;
return;
}
/* Optimize strlcpy by using redirect->uri + redirect->len */
p = redirect->uri + redirect->len;
sz = sizeof(redirect->uri) - redirect->len;
if ((len = strlcpy(p, s, sz)) >= sz)
redirect->valid = 0;
else
redirect->len += len;
}
static int
make_redirect_uri_param_cb(void *d,
enum MHD_ValueKind kind,
const char *key,
const char *val)
{
struct redirect_uri *redirect = d;
redirect_uri_appends(redirect, redirect->first_param ? "?" : "&");
redirect_uri_appends(redirect, key);
if (val) {
redirect_uri_appends(redirect, "=");
redirect_uri_appends(redirect, val);
}
redirect->first_param = 0;
return MHD_YES;
}
static const char *
make_redirect_uri(kadmin_request_desc r, const char *base)
{
redirect_uri.len = 0;
redirect_uri.uri[0] = '\0';
redirect_uri.valid = 1;
redirect_uri.first_param = 1;
redirect_uri_appends(&redirect_uri, base); /* Redirect to primary URI base */
redirect_uri_appends(&redirect_uri, r->reqtype); /* URI local-part */
(void) MHD_get_connection_values(r->connection, MHD_GET_ARGUMENT_KIND,
make_redirect_uri_param_cb,
&redirect_uri);
return redirect_uri.valid ? redirect_uri.uri : NULL;
}
/*
* XXX Shouldn't be a body, but a status message. The body should be
* configurable to be from a file. MHD doesn't give us a way to set the
* response status message though, just the body.
*
* Calls audit_trail().
*
* Returns -1 if something terrible happened, which should ultimately cause
* route() to return MHD_NO, which should cause libmicrohttpd to close the
* connection to the user-agent.
*
* Returns 0 in all other cases.
*/
static krb5_error_code
resp(kadmin_request_desc r,
int http_status_code,
krb5_error_code ret,
enum MHD_ResponseMemoryMode rmmode,
const char *content_type,
const void *body,
size_t bodylen,
const char *token,
const char *csrf)
{
struct MHD_Response *response;
int mret = MHD_YES;
if (r->response_set) {
krb5_log_msg(r->context, logfac, 1, NULL,
"Internal error; attempted to set a second response");
return 0;
}
(void) gettimeofday(&r->tv_end, NULL);
audit_trail(r, ret);
if (body && bodylen == BODYLEN_IS_STRLEN)
bodylen = strlen(body);
response = MHD_create_response_from_buffer(bodylen, rk_UNCONST(body),
rmmode);
if (response == NULL)
return -1;
mret = MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL,
"no-store, max-age=0");
if (mret == MHD_YES && http_status_code == MHD_HTTP_UNAUTHORIZED) {
size_t i;
if (auth_types.num_strings < 1)
http_status_code = MHD_HTTP_SERVICE_UNAVAILABLE;
else
for (i = 0; mret == MHD_YES && i < auth_types.num_strings; i++)
mret = MHD_add_response_header(response,
MHD_HTTP_HEADER_WWW_AUTHENTICATE,
auth_types.strings[i]);
} else if (mret == MHD_YES && http_status_code == MHD_HTTP_TEMPORARY_REDIRECT) {
const char *redir = make_redirect_uri(r, primary_server_URI);
if (redir)
mret = MHD_add_response_header(response, MHD_HTTP_HEADER_LOCATION,
redir);
else
/* XXX Find a way to set a new response body; log */
http_status_code = MHD_HTTP_SERVICE_UNAVAILABLE;
}
if (mret == MHD_YES && csrf)
mret = MHD_add_response_header(response,
"X-CSRF-Token",
csrf);
if (mret == MHD_YES && content_type) {
mret = MHD_add_response_header(response,
MHD_HTTP_HEADER_CONTENT_TYPE,
content_type);
}
if (mret != MHD_NO)
mret = MHD_queue_response(r->connection, http_status_code, response);
MHD_destroy_response(response);
r->response_set = 1;
return mret == MHD_NO ? -1 : 0;
}
static krb5_error_code
bad_reqv(kadmin_request_desc r,
krb5_error_code code,
int http_status_code,
const char *fmt,
va_list ap)
{
krb5_error_code ret;
krb5_context context = NULL;
const char *k5msg = NULL;
const char *emsg = NULL;
char *formatted = NULL;
char *msg = NULL;
if (r && r->context)
context = r->context;
if (r && r->hcontext && r->kv)
heim_audit_addkv((heim_svc_req_desc)r, 0, "http-status-code", "%d",
http_status_code);
(void) gettimeofday(&r->tv_end, NULL);
if (code == ENOMEM) {
if (context)
krb5_log_msg(context, logfac, 1, NULL, "Out of memory");
return resp(r, http_status_code, code, MHD_RESPMEM_PERSISTENT,
NULL, fmt, BODYLEN_IS_STRLEN, NULL, NULL);
}
if (code) {
if (context)
emsg = k5msg = krb5_get_error_message(context, code);
else
emsg = strerror(code);
}
ret = vasprintf(&formatted, fmt, ap) == -1;
if (code) {
if (ret > -1 && formatted)
ret = asprintf(&msg, "%s: %s (%d)", formatted, emsg, (int)code);
} else {
msg = formatted;
formatted = NULL;
}
if (r && r->hcontext)
heim_audit_addreason((heim_svc_req_desc)r, "%s", formatted);
krb5_free_error_message(context, k5msg);
if (ret == -1 || msg == NULL) {
if (context)
krb5_log_msg(context, logfac, 1, NULL, "Out of memory");
return resp(r, MHD_HTTP_SERVICE_UNAVAILABLE, ENOMEM,
MHD_RESPMEM_PERSISTENT, NULL,
"Out of memory", BODYLEN_IS_STRLEN, NULL, NULL);
}
ret = resp(r, http_status_code, code, MHD_RESPMEM_MUST_COPY,
NULL, msg, BODYLEN_IS_STRLEN, NULL, NULL);
free(formatted);
free(msg);
return ret == -1 ? -1 : code;
}
static krb5_error_code
bad_req(kadmin_request_desc r,
krb5_error_code code,
int http_status_code,
const char *fmt,
...)
{
krb5_error_code ret;
va_list ap;
va_start(ap, fmt);
ret = bad_reqv(r, code, http_status_code, fmt, ap);
va_end(ap);
return ret;
}
static krb5_error_code
bad_enomem(kadmin_request_desc r, krb5_error_code ret)
{
return bad_req(r, ret, MHD_HTTP_SERVICE_UNAVAILABLE,
"Out of memory");
}
static krb5_error_code
bad_400(kadmin_request_desc r, int ret, const char *reason)
{
return bad_req(r, ret, MHD_HTTP_BAD_REQUEST, "%s", reason);
}
static krb5_error_code
bad_401(kadmin_request_desc r, const char *reason)
{
return bad_req(r, EACCES, MHD_HTTP_UNAUTHORIZED, "%s", reason);
}
static krb5_error_code
bad_403(kadmin_request_desc r, krb5_error_code ret, const char *reason)
{
return bad_req(r, ret, MHD_HTTP_FORBIDDEN, "%s", reason);
}
static krb5_error_code
bad_404(kadmin_request_desc r, const char *name)
{
return bad_req(r, ENOENT, MHD_HTTP_NOT_FOUND,
"Resource not found: %s", name);
}
static krb5_error_code
bad_405(kadmin_request_desc r, const char *method)
{
return bad_req(r, EPERM, MHD_HTTP_METHOD_NOT_ALLOWED,
"Method not supported: %s", method);
}
static krb5_error_code
bad_method_want_POST(kadmin_request_desc r)
{
return bad_req(r, EPERM, MHD_HTTP_METHOD_NOT_ALLOWED,
"Use POST for making changes to principals");
}
#if 0
static krb5_error_code
bad_500(kadmin_request_desc r,
krb5_error_code ret,
const char *reason)
{
return bad_req(r, ret, MHD_HTTP_INTERNAL_SERVER_ERROR,
"Internal error: %s", reason);
}
#endif
static krb5_error_code
bad_503(kadmin_request_desc r,
krb5_error_code ret,
const char *reason)
{
return bad_req(r, ret, MHD_HTTP_SERVICE_UNAVAILABLE,
"Service unavailable: %s", reason);
}
static krb5_error_code
good_ext_keytab(kadmin_request_desc r)
{
krb5_error_code ret;
size_t bodylen;
void *body;
char *p;
if (!r->keytab_name || !(p = strchr(r->keytab_name, ':')))
return bad_503(r, EINVAL, "Internal error (no keytab produced)");
p++;
if (strncmp(p, cache_dir, strlen(cache_dir)) != 0)
return bad_503(r, EINVAL, "Internal error");
ret = rk_undumpdata(p, &body, &bodylen);
if (ret)
return bad_503(r, ret, "Could not recover keytab from temp file");
ret = resp(r, MHD_HTTP_OK, 0, MHD_RESPMEM_MUST_COPY,
"application/octet-stream", body, bodylen, NULL, NULL);
free(body);
return ret;
}
static krb5_error_code
check_service_name(kadmin_request_desc r, const char *name)
{
if (name == NULL || name[0] == '\0' ||
strchr(name, '/') || strchr(name, '\\') || strchr(name, '@') ||
strcmp(name, "krbtgt") == 0 ||
strcmp(name, "iprop") == 0 ||
strcmp(name, "kadmin") == 0 ||
strcmp(name, "hprop") == 0 ||
strcmp(name, "WELLKNOWN") == 0 ||
strcmp(name, "K") == 0) {
krb5_set_error_message(r->context, EACCES,
"No one is allowed to fetch keys for "
"Heimdal service %s", name);
return EACCES;
}
if (strcmp(name, "root") != 0 &&
strcmp(name, "host") != 0 &&
strcmp(name, "exceed") != 0)
return 0;
if (krb5_config_get_bool_default(r->context, NULL, FALSE,
"ext_keytab",
"csr_authorizer_handles_svc_names",
NULL))
return 0;
krb5_set_error_message(r->context, EACCES,
"No one is allowed to fetch keys for "
"service \"%s\" because of authorizer "
"limitations", name);
return EACCES;
}
static int
param_cb(void *d,
enum MHD_ValueKind kind,
const char *key,
const char *val)
{
kadmin_request_desc r = d;
krb5_error_code ret = 0;
heim_string_t s = NULL;
/*
* Multi-valued params:
*
* - spn=<service>/<hostname>
* - dNSName=<hostname>
* - service=<service>
*
* Single-valued params:
*
* - realm=<REALM>
* - materialize=true -- create a concrete princ where it's virtual
* - enctypes=... -- key-salt types
* - revoke=true -- delete old keys (concrete princs only)
* - rotate=true -- change keys (no-op for virtual princs)
* - create=true -- create a concrete princ
* - ro=true -- perform no writes
*/
if (strcmp(key, "realm") == 0 && val) {
if (!r->realm && !(r->realm = strdup(val)))
ret = krb5_enomem(r->context);
} else if (strcmp(key, "materialize") == 0 ||
strcmp(key, "revoke") == 0 ||
strcmp(key, "rotate") == 0 ||
strcmp(key, "create") == 0 ||
strcmp(key, "ro") == 0) {
heim_audit_addkv((heim_svc_req_desc)r, KDC_AUDIT_VIS,
"requested_option", "%s", key);
if (!val || strcmp(val, "true") != 0)
krb5_set_error_message(r->context, ret = EINVAL,
"get-keys \"%s\" q-param accepts "
"only \"true\"", key);
else if (strcmp(key, "materialize") == 0)
r->materialize = 1;
else if (strcmp(key, "revoke") == 0)
r->revoke = 1;
else if (strcmp(key, "rotate") == 0)
r->rotate = 1;
else if (strcmp(key, "create") == 0)
r->create = 1;
else if (strcmp(key, "ro") == 0)
r->ro = 1;
} else if (strcmp(key, "dNSName") == 0 && val) {
heim_audit_addkv((heim_svc_req_desc)r, KDC_AUDIT_VIS,
"requested_dNSName", "%s", val);
if (r->is_self) {
krb5_set_error_message(r->context, ret = EACCES,
"only one service may be requested for self");
} else if (strchr(val, '.') == NULL) {
krb5_set_error_message(r->context, ret = EACCES,
"dNSName must have at least one '.' in it");
} else {
s = heim_string_create(val);
if (!s)
ret = krb5_enomem(r->context);
else
ret = heim_array_append_value(r->hostnames, s);
}
if (ret == 0)
ret = hx509_request_add_dns_name(r->context->hx509ctx, r->req, val);
} else if (strcmp(key, "service") == 0 && val) {
heim_audit_addkv((heim_svc_req_desc)r, KDC_AUDIT_VIS,
"requested_service", "%s", val);
if (r->is_self)
krb5_set_error_message(r->context, ret = EACCES,
"use \"spn\" for self");
else
ret = check_service_name(r, val);
if (ret == 0) {
s = heim_string_create(val);
if (!s)
ret = krb5_enomem(r->context);
else
ret = heim_array_append_value(r->service_names, s);
}
} else if (strcmp(key, "enctypes") == 0 && val) {
r->enctypes = strdup(val);
if (!(r->enctypes = strdup(val)))
ret = krb5_enomem(r->context);
heim_audit_addkv((heim_svc_req_desc)r, KDC_AUDIT_VIS,
"requested_enctypes", "%s", val);
} else if (r->is_self && strcmp(key, "spn") == 0 && val) {
heim_audit_addkv((heim_svc_req_desc)r, KDC_AUDIT_VIS,
"requested_spn", "%s", val);
krb5_set_error_message(r->context, ret = EACCES,
"only one service may be requested for self");
} else if (strcmp(key, "spn") == 0 && val) {
krb5_principal p = NULL;
const char *hostname = "";
heim_audit_addkv((heim_svc_req_desc)r, KDC_AUDIT_VIS,
"requested_spn", "%s", val);
ret = krb5_parse_name_flags(r->context, val,
KRB5_PRINCIPAL_PARSE_NO_DEF_REALM, &p);
if (ret == 0 && krb5_principal_get_realm(r->context, p) == NULL)
ret = krb5_principal_set_realm(r->context, p,
r->realm ? r->realm : realm);
/*
* The SPN has to have two components.
*
* TODO: Support more components? Support AD-style NetBIOS computer
* account names?
*/
if (ret == 0 && krb5_principal_get_num_comp(r->context, p) != 2)
ret = ENOTSUP;
/*
* Allow only certain service names. Except that when
* the SPN == the requestor's principal name then allow the "host"
* service name.
*/
if (ret == 0) {
const char *service =
krb5_principal_get_comp_string(r->context, p, 0);
if (strcmp(service, "host") == 0 &&
krb5_principal_compare(r->context, p, r->cprinc) &&
!r->is_self &&
heim_array_get_length(r->hostnames) == 0 &&
heim_array_get_length(r->spns) == 0) {
r->is_self = 1;
} else
ret = check_service_name(r, service);
}
if (ret == 0 && !krb5_principal_compare(r->context, p, r->cprinc))
ret = check_service_name(r,
krb5_principal_get_comp_string(r->context,
p, 0));
if (ret == 0) {
hostname = krb5_principal_get_comp_string(r->context, p, 1);
if (!hostname || !strchr(hostname, '.'))
krb5_set_error_message(r->context, ret = ENOTSUP,
"Only host-based service names supported");
}
if (ret == 0 && r->realm)
ret = krb5_principal_set_realm(r->context, p, r->realm);
else if (ret == 0 && realm)
ret = krb5_principal_set_realm(r->context, p, realm);
if (ret == 0)
ret = hx509_request_add_dns_name(r->context->hx509ctx, r->req,
hostname);
if (ret == 0 && !(s = heim_string_create(val)))
ret = krb5_enomem(r->context);
if (ret == 0)
ret = heim_array_append_value(r->spns, s);
krb5_free_principal(r->context, p);
#if 0
/* The authorizer probably doesn't know what to do with this */
ret = hx509_request_add_pkinit(r->context->hx509ctx, r->req, val);
#endif
} else {
/* Produce error for unknown params */
heim_audit_addkv((heim_svc_req_desc)r, 0, "requested_unknown", "true");
krb5_set_error_message(r->context, ret = ENOTSUP,
"Query parameter %s not supported", key);
}
if (ret && !r->ret)
r->ret = ret;
heim_release(s);
return ret ? MHD_NO /* Stop iterating */ : MHD_YES;
}
static krb5_error_code
authorize_req(kadmin_request_desc r)
{
krb5_error_code ret;
r->is_self = 0;
ret = hx509_request_init(r->context->hx509ctx, &r->req);
if (ret)
return bad_enomem(r, ret);
(void) MHD_get_connection_values(r->connection, MHD_GET_ARGUMENT_KIND,
param_cb, r);
ret = r->ret;
if (ret == EACCES)
return bad_403(r, ret, "Not authorized to requested principal(s)");
if (ret)
return bad_req(r, ret, MHD_HTTP_SERVICE_UNAVAILABLE,
"Could not handle query parameters");
if (r->is_self)
ret = 0;
else
ret = kdc_authorize_csr(r->context, "ext_keytab", r->req, r->cprinc);
if (ret == EACCES || ret == EINVAL || ret == ENOTSUP ||
ret == KRB5KDC_ERR_POLICY)
return bad_403(r, ret, "Not authorized to requested principal(s)");
if (ret)
return bad_req(r, ret, MHD_HTTP_SERVICE_UNAVAILABLE,
"Error checking authorization");
return ret;
}
static krb5_error_code
make_keytab(kadmin_request_desc r)
{
krb5_error_code ret = 0;
int fd = -1;
r->keytab_name = NULL;
if (asprintf(&r->keytab_name, "FILE:%s/kt-XXXXXX", cache_dir) == -1 ||
r->keytab_name == NULL)
ret = krb5_enomem(r->context);
if (ret == 0)
fd = mkstemp(r->keytab_name + sizeof("FILE:") - 1);
if (ret == 0 && fd == -1)
ret = errno;
if (ret == 0)
ret = krb5_kt_resolve(r->context, r->keytab_name, &r->keytab);
if (fd != -1)
(void) close(fd);
return ret;
}
static krb5_error_code
write_keytab(kadmin_request_desc r,
kadm5_principal_ent_rec *princ,
const char *unparsed)
{
krb5_error_code ret = 0;
krb5_keytab_entry key;
size_t i;
if (princ->n_key_data <= 0)
return 0;
if (kadm5_some_keys_are_bogus(princ->n_key_data, &princ->key_data[0])) {
krb5_warn(r->context, ret,
"httpkadmind running with insufficient kadmin privilege "
"for extracting keys for %s", unparsed);
krb5_log_msg(r->context, logfac, 1, NULL,
"httpkadmind running with insufficient kadmin privilege "
"for extracting keys for %s", unparsed);
return EACCES;
}
memset(&key, 0, sizeof(key));
for (i = 0; ret == 0 && i < princ->n_key_data; i++) {
krb5_key_data *kd = &princ->key_data[i];
key.principal = princ->principal;
key.vno = kd->key_data_kvno;
key.keyblock.keytype = kd->key_data_type[0];
key.keyblock.keyvalue.length = kd->key_data_length[0];
key.keyblock.keyvalue.data = kd->key_data_contents[0];
/*
* FIXME kadm5 doesn't give us set_time here. If it gave us the
* KeyRotation metadata, we could compute it. But this might be a
* concrete principal with concrete keys, in which case we can't.
*
* To fix this we need to extend the protocol and the API.
*/
key.timestamp = time(NULL);
ret = krb5_kt_add_entry(r->context, r->keytab, &key);
}
if (ret)
krb5_warn(r->context, ret,
"Failed to write keytab entries for %s", unparsed);
return ret;
}
static void
random_password(krb5_context context, char *buf, size_t buflen)
{
static const char chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.,";
char p[32];
size_t i;
char b;
buflen--;
for (i = 0; i < buflen; i++) {
if (i % sizeof(p) == 0)
krb5_generate_random_block(p, sizeof(p));
b = p[i % sizeof(p)];
buf[i] = chars[b % (sizeof(chars) - 1)];
}
buf[i] = '\0';
}
static krb5_error_code
make_kstuple(krb5_context context,
kadm5_principal_ent_rec *p,
krb5_key_salt_tuple **kstuple,
size_t *n_kstuple)
{
size_t i;
*kstuple = 0;
*n_kstuple = 0;
if (p->n_key_data < 1)
return 0;
*kstuple = calloc(p->n_key_data, sizeof (*kstuple));
for (i = 0; *kstuple && i < p->n_key_data; i++) {
if (p->key_data[i].key_data_kvno == p->kvno) {
(*kstuple)[i].ks_enctype = p->key_data[i].key_data_type[0];
(*kstuple)[i].ks_salttype = p->key_data[i].key_data_type[1];
(*n_kstuple)++;
}
}
return *kstuple ? 0 :krb5_enomem(context);
}
/*
* Get keys for one principal.
*
* Does NOT set an HTTP response.
*/
static krb5_error_code
get_keys1(kadmin_request_desc r, const char *pname)
{
kadm5_principal_ent_rec princ;
krb5_key_salt_tuple *kstuple = NULL;
krb5_error_code ret = 0;
krb5_principal p = NULL;
uint32_t mask =
KADM5_PRINCIPAL | KADM5_KVNO | KADM5_MAX_LIFE | KADM5_MAX_RLIFE |
KADM5_ATTRIBUTES | KADM5_KEY_DATA | KADM5_TL_DATA;
uint32_t create_mask = mask & ~(KADM5_KEY_DATA | KADM5_TL_DATA);
size_t nkstuple = 0;
int change = 0;
int refetch = 0;
int freeit = 0;
memset(&princ, 0, sizeof(princ));
princ.key_data = NULL;
princ.tl_data = NULL;
ret = krb5_parse_name(r->context, pname, &p);
if (ret == 0 && r->realm)
ret = krb5_principal_set_realm(r->context, p, r->realm);
else if (ret == 0 && realm)
ret = krb5_principal_set_realm(r->context, p, realm);
if (ret == 0 && r->enctypes)
ret = krb5_string_to_keysalts2(r->context, r->enctypes,
&nkstuple, &kstuple);
if (ret == 0)
ret = kadm5_get_principal(r->kadm_handle, p, &princ, mask);
if (ret == 0) {
freeit = 1;
/*
* If princ is virtual and we're not asked to materialize, ignore
* requests to rotate.
*/
if (!r->materialize &&
(princ.attributes & (KRB5_KDB_VIRTUAL_KEYS | KRB5_KDB_VIRTUAL))) {
r->rotate = 0;
r->revoke = 0;
}
}
change = !r->ro && (r->rotate || r->revoke);
/* Handle create / materialize options */
if (ret == KADM5_UNK_PRINC && r->create) {
char pw[128];
if (read_only)
ret = KADM5_READ_ONLY;
else
ret = strcmp(r->method, "POST") == 0 ? 0 : ENOSYS; /* XXX */
if (ret == 0 && local_hdb && local_hdb_read_only) {
/* Make sure we can write */
kadm5_destroy(r->kadm_handle);
r->kadm_handle = NULL;
ret = get_kadm_handle(r->context, r->realm, 1 /* want_write */,
&r->kadm_handle);
}
memset(&princ, 0, sizeof(princ));
/*
* Some software is allergic to kvno 1, assuming that kvno 1 implies
* half-baked service principal. We've some vague recollection of
* something similar for kvno 2, so let's start at 3.
*/
princ.kvno = 3;
princ.tl_data = NULL;
princ.key_data = NULL;
princ.max_life = 24 * 3600; /* XXX Make configurable */
princ.max_renewable_life = princ.max_life; /* XXX Make configurable */
random_password(r->context, pw, sizeof(pw));
princ.principal = p; /* Borrow */
if (ret == 0)
ret = kadm5_create_principal_3(r->kadm_handle, &princ, create_mask,
nkstuple, kstuple, pw);
princ.principal = NULL; /* Return */
refetch = 1;
freeit = 1;
} else if (ret == 0 && r->materialize &&
(princ.attributes & KRB5_KDB_VIRTUAL)) {
#ifndef MATERIALIZE_NOTYET
ret = ENOTSUP;
#else
if (read_only)
ret = KADM5_READ_ONLY;
else
ret = strcmp(r->method, "POST") == 0 ? 0 : ENOSYS; /* XXX */
if (ret == 0 && local_hdb && local_hdb_read_only) {
/* Make sure we can write */
kadm5_destroy(r->kadm_handle);
r->kadm_handle = NULL;
ret = get_kadm_handle(r->context, r->realm, 1 /* want_write */,
&r->kadm_handle);
}
princ.attributes |= KRB5_KDB_MATERIALIZE;
princ.attributes &= ~KRB5_KDB_VIRTUAL;
/*
* XXX If there are TL data which should be re-encoded and sent as
* KRB5_TL_EXTENSION, then this call will fail with KADM5_BAD_TL_TYPE.
*
* We should either drop those TLs, re-encode them, or make
* perform_tl_data() handle them. (New extensions should generally go
* as KRB5_TL_EXTENSION so that non-critical ones can be set on
* principals via old kadmind programs that don't support them.)
*
* What we really want is a kadm5 utility function to convert some TLs
* to KRB5_TL_EXTENSION and drop all others.
*/
if (ret == 0)
ret = kadm5_create_principal(r->kadm_handle, &princ, mask, "");
refetch = 1;
#endif
} /* else create/materialize q-params are superfluous */
/* Handle rotate / revoke options */
if (ret == 0 && change) {
krb5_keyblock *k = NULL;
size_t i;
int n_k = 0;
int keepold = r->revoke ? 0 : 1;
if (read_only)
ret = KADM5_READ_ONLY;
else
ret = strcmp(r->method, "POST") == 0 ? 0 : ENOSYS; /* XXX */
if (ret == 0 && local_hdb && local_hdb_read_only) {
/* Make sure we can write */
kadm5_destroy(r->kadm_handle);
r->kadm_handle = NULL;
ret = get_kadm_handle(r->context, r->realm, 1 /* want_write */,
&r->kadm_handle);
}
/* Use requested enctypes or same ones as princ already had keys for */
if (ret == 0 && kstuple == NULL)
ret = make_kstuple(r->context, &princ, &kstuple, &nkstuple);
/* Set new keys */
if (ret == 0)
ret = kadm5_randkey_principal_3(r->kadm_handle, p, keepold,
nkstuple, kstuple, &k, &n_k);
refetch = 1;
for (i = 0; n_k > 0 && i < n_k; i++)
krb5_free_keyblock_contents(r->context, &k[i]);
free(kstuple);
free(k);
}
if (ret == 0 && refetch) {
/* Refetch changed principal */
if (freeit)
kadm5_free_principal_ent(r->kadm_handle, &princ);
freeit = 0;
ret = kadm5_get_principal(r->kadm_handle, p, &princ, mask);
if (ret == 0)
freeit = 1;
}
if (ret == 0)
ret = write_keytab(r, &princ, pname);
if (freeit)
kadm5_free_principal_ent(r->kadm_handle, &princ);
krb5_free_principal(r->context, p);
return ret;
}
static krb5_error_code check_csrf(kadmin_request_desc);
/*
* Calls get_keys1() to extract each requested principal's keys.
*
* When this returns a response will have been set.
*/
static krb5_error_code
get_keysN(kadmin_request_desc r, const char *method)
{
krb5_error_code ret;
size_t nhosts;
size_t nsvcs;
size_t nspns;
size_t i, k;
/* Parses and validates the request, then checks authorization */
ret = authorize_req(r);
if (ret)
return ret; /* authorize_req() calls bad_req() on error */
ret = get_kadm_handle(r->context, r->realm ? r->realm : realm,
0 /* want_write */, &r->kadm_handle);
if (strcmp(method, "POST") == 0 && (ret = check_csrf(r)))
return ret; /* check_csrf() calls bad_req() on error */
nhosts = heim_array_get_length(r->hostnames);
nsvcs = heim_array_get_length(r->service_names);
nspns = heim_array_get_length(r->spns);
if (!nhosts && !nspns)
return bad_403(r, EINVAL, "No service principals requested");
if (nhosts && !nsvcs) {
heim_string_t s;
if ((s = heim_string_create("HTTP")) == NULL)
ret = krb5_enomem(r->context);
if (ret == 0)
ret = heim_array_append_value(r->service_names, s);
heim_release(s);
nsvcs = 1;
}
/* FIXME: Make this configurable */
if (nspns + nsvcs * nhosts > 40)
return bad_403(r, EINVAL, "Requested keys for too many principals");
ret = make_keytab(r);
for (i = 0; ret == 0 && i < nsvcs; i++) {
const char *svc =
heim_string_get_utf8(
heim_array_get_value(r->service_names, i));
for (k = 0; ret == 0 && k < nhosts; k++) {
krb5_principal p = NULL;
const char *hostname =
heim_string_get_utf8(
heim_array_get_value(r->hostnames, k));
char *spn = NULL;
ret = krb5_make_principal(r->context, &p,
r->realm ? r->realm : realm,
svc, hostname, NULL);
if (ret == 0)
ret = krb5_unparse_name(r->context, p, &spn);
if (ret == 0)
ret = get_keys1(r, spn);
krb5_free_principal(r->context, p);
free(spn);
}
}
for (i = 0; ret == 0 && i < nspns; i++) {
ret = get_keys1(r,
heim_string_get_utf8(heim_array_get_value(r->spns,
i)));
}
switch (ret) {
case -1:
/* Can't happen */
krb5_log_msg(r->context, logfac, 1, NULL,
"Failed to extract keys for unknown reasons");
if (r->response_set)
return MHD_YES;
return bad_503(r, ret, "Could not get keys");
case ENOSYS:
/* Our convention */
return bad_method_want_POST(r);
case KADM5_READ_ONLY:
if (primary_server_URI) {
krb5_log_msg(r->context, logfac, 1, NULL,
"Redirect %s to primary server", r->cname);
return resp(r, MHD_HTTP_TEMPORARY_REDIRECT, KADM5_READ_ONLY,
MHD_RESPMEM_PERSISTENT, NULL, "", 0, NULL, NULL);
} else {
krb5_log_msg(r->context, logfac, 1, NULL, "HDB is read-only");
return bad_403(r, ret, "HDB is read-only");
}
case 0:
krb5_log_msg(r->context, logfac, 1, NULL, "Sent keytab to %s",
r->cname);
return good_ext_keytab(r);
default:
return bad_503(r, ret, "Could not get keys");
}
}
/* Copied from kdc/connect.c */
static void
addr_to_string(krb5_context context,
struct sockaddr *addr,
char *str,
size_t len)
{
krb5_error_code ret;
krb5_address a;
ret = krb5_sockaddr2address(context, addr, &a);
if (ret == 0) {
ret = krb5_print_address(&a, str, len, &len);
krb5_free_address(context, &a);
}
if (ret)
snprintf(str, len, "<family=%d>", addr->sa_family);
}
static krb5_error_code
set_req_desc(struct MHD_Connection *connection,
const char *method,
const char *url,
kadmin_request_desc r)
{
const union MHD_ConnectionInfo *ci;
const char *token;
krb5_error_code ret;
memset(r, 0, sizeof(*r));
(void) gettimeofday(&r->tv_start, NULL);
if ((ret = get_krb5_context(&r->context)))
return ret;
/* HEIM_SVC_REQUEST_DESC_COMMON_ELEMENTS fields */
r->request.data = "<HTTP-REQUEST>";
r->request.length = sizeof("<HTTP-REQUEST>");
r->from = r->frombuf;
r->config = NULL;
r->logf = logfac;
r->reqtype = url;
r->reason = NULL;
r->reply = NULL;
r->sname = NULL;
r->cname = NULL;
r->addr = NULL;
r->kv = heim_array_create();
/* Our fields */
r->connection = connection;
r->kadm_handle = NULL;
r->hcontext = r->context->hcontext;
r->service_names = heim_array_create();
r->hostnames = heim_array_create();
r->spns = heim_array_create();
r->keytab_name = NULL;
r->enctypes = NULL;
r->freeme1 = NULL;
r->method = method;
r->cprinc = NULL;
r->req = NULL;
r->sp = NULL;
ci = MHD_get_connection_info(connection,
MHD_CONNECTION_INFO_CLIENT_ADDRESS);
if (ci) {
r->addr = ci->client_addr;
addr_to_string(r->context, r->addr, r->frombuf, sizeof(r->frombuf));
}
if (r->kv) {
heim_audit_addkv((heim_svc_req_desc)r, 0, "method", "GET");
heim_audit_addkv((heim_svc_req_desc)r, 0, "endpoint", "%s", r->reqtype);
}
token = MHD_lookup_connection_value(r->connection, MHD_HEADER_KIND,
MHD_HTTP_HEADER_AUTHORIZATION);
if (token && r->kv) {
const char *token_end;
if ((token_end = strchr(token, ' ')) == NULL ||
(token_end - token) > INT_MAX || (token_end - token) < 2)
heim_audit_addkv((heim_svc_req_desc)r, 0, "auth", "<unknown>");
else
heim_audit_addkv((heim_svc_req_desc)r, 0, "auth", "%.*s",
(int)(token_end - token), token);
}
if (ret == 0 && r->kv == NULL) {
krb5_log_msg(r->context, logfac, 1, NULL, "Out of memory");
ret = r->ret = ENOMEM;
}
return ret;
}
static void
clean_req_desc(kadmin_request_desc r)
{
if (!r)
return;
if (r->keytab)
krb5_kt_destroy(r->context, r->keytab);
else if (r->keytab_name && strchr(r->keytab_name, ':'))
(void) unlink(strchr(r->keytab_name, ':') + 1);
if (r->kadm_handle)
kadm5_destroy(r->kadm_handle);
hx509_request_free(&r->req);
heim_release(r->service_names);
heim_release(r->hostnames);
heim_release(r->reason);
heim_release(r->spns);
heim_release(r->kv);
krb5_free_principal(r->context, r->cprinc);
free(r->keytab_name);
free(r->enctypes);
free(r->freeme1);
free(r->cname);
free(r->sname);
}
/* Implements GETs of /get-keys */
static krb5_error_code
get_keys(kadmin_request_desc r, const char *method)
{
krb5_error_code ret;
if ((ret = validate_token(r)))
return ret; /* validate_token() calls bad_req() */
if (r->cname == NULL || r->cprinc == NULL)
return bad_403(r, EINVAL,
"Could not extract principal name from token");
return get_keysN(r, method); /* Sets an HTTP response */
}
/* Implements GETs of /get-config */
static krb5_error_code
get_config(kadmin_request_desc r)
{
kadm5_principal_ent_rec princ;
krb5_error_code ret;
krb5_principal p = NULL;
uint32_t mask = KADM5_PRINCIPAL | KADM5_TL_DATA;
krb5_tl_data *tl_next;
const char *pname;
/* Default configuration for principals that have none set: */
size_t bodylen = sizeof("include /etc/krb5.conf\n") - 1;
void *body = "include /etc/krb5.conf\n";
int freeit = 0;
if ((ret = validate_token(r)))
return ret; /* validate_token() calls bad_req() */
if (r->cname == NULL || r->cprinc == NULL)
return bad_403(r, EINVAL,
"Could not extract principal name from token");
/*
* No authorization needed -- configs are public. Though we do require
* authentication (above).
*/
ret = get_kadm_handle(r->context, r->realm ? r->realm : realm,
0 /* want_write */, &r->kadm_handle);
memset(&princ, 0, sizeof(princ));
princ.key_data = NULL;
princ.tl_data = NULL;
pname = MHD_lookup_connection_value(r->connection, MHD_GET_ARGUMENT_KIND,
"princ");
if (pname == NULL)
pname = r->cname;
ret = krb5_parse_name(r->context, pname, &p);
if (ret == 0) {
ret = kadm5_get_principal(r->kadm_handle, p, &princ, mask);
if (ret == 0) {
freeit = 1;
for (tl_next = princ.tl_data; tl_next; tl_next = tl_next->tl_data_next) {
if (tl_next->tl_data_type != KRB5_TL_KRB5_CONFIG)
continue;
bodylen = tl_next->tl_data_length;
body = tl_next->tl_data_contents;
break;
}
} else {
r->ret = ret;
return bad_404(r, "/get-config");
}
}
if (ret == 0) {
krb5_log_msg(r->context, logfac, 1, NULL,
"Returned krb5.conf contents to %s", r->cname);
ret = resp(r, MHD_HTTP_OK, 0, MHD_RESPMEM_MUST_COPY,
"application/text", body, bodylen, NULL, NULL);
} else {
ret = bad_503(r, ret, "Could not retrieve principal configuration");
}
if (freeit)
kadm5_free_principal_ent(r->kadm_handle, &princ);
krb5_free_principal(r->context, p);
return ret;
}
static krb5_error_code
mac_csrf_token(kadmin_request_desc r, krb5_storage *sp)
{
kadm5_principal_ent_rec princ;
krb5_error_code ret;
krb5_principal p = NULL;
krb5_data data;
char mac[EVP_MAX_MD_SIZE];
unsigned int maclen = sizeof(mac);
HMAC_CTX *ctx = NULL;
size_t i = 0;
int freeit = 0;
memset(&princ, 0, sizeof(princ));
ret = krb5_storage_to_data(sp, &data);
if (r->kadm_handle == NULL)
ret = get_kadm_handle(r->context, r->realm, 0 /* want_write */,
&r->kadm_handle);
if (ret == 0)
ret = krb5_make_principal(r->context, &p,
r->realm ? r->realm : realm,
"WELLKNOWN", "CSRFTOKEN", NULL);
if (ret == 0)
ret = kadm5_get_principal(r->kadm_handle, p, &princ,
KADM5_PRINCIPAL | KADM5_KVNO |
KADM5_KEY_DATA);
if (ret == 0)
freeit = 1;
if (ret == 0 && princ.n_key_data < 1)
ret = KADM5_UNK_PRINC;
if (ret == 0)
for (i = 0; i < princ.n_key_data; i++)
if (princ.key_data[i].key_data_kvno == princ.kvno)
break;
if (ret == 0 && i == princ.n_key_data)
i = 0; /* Weird, but can't happen */
if (ret == 0 && (ctx = HMAC_CTX_new()) == NULL)
ret = krb5_enomem(r->context);
/* HMAC the token body and the client principal name */
if (ret == 0) {
HMAC_Init_ex(ctx, princ.key_data[i].key_data_contents[0], princ.key_data[i].key_data_length[0], EVP_sha256(), NULL);
HMAC_Update(ctx, data.data, data.length);
HMAC_Update(ctx, r->cname, strlen(r->cname));
HMAC_Final(ctx, mac, &maclen);
krb5_data_free(&data);
data.length = maclen;
data.data = mac;
if (krb5_storage_write(sp, mac, maclen) != maclen)
ret = krb5_enomem(r->context);
}
krb5_free_principal(r->context, p);
if (freeit)
kadm5_free_principal_ent(r->kadm_handle, &princ);
if (ctx)
HMAC_CTX_free(ctx);
return ret;
}
static krb5_error_code
make_csrf_token(kadmin_request_desc r,
const char *given,
char **token,
int64_t *age)
{
static HEIMDAL_THREAD_LOCAL char tokenbuf[128]; /* See below, be sad */
krb5_error_code ret = 0;
unsigned char given_decoded[128];
krb5_storage *sp = NULL;
krb5_data data;
ssize_t dlen = -1;
uint64_t nonce;
int64_t t = 0;
*age = 0;
data.data = NULL;
data.length = 0;
if (given) {
size_t len = strlen(given);
if (len >= sizeof(given_decoded))
ret = ERANGE;
if (ret == 0 && (dlen = rk_base64_decode(given, &given_decoded)) <= 0)
ret = errno;
if (ret == 0 &&
(sp = krb5_storage_from_mem(given_decoded, dlen)) == NULL)
ret = krb5_enomem(r->context);
if (ret == 0)
ret = krb5_ret_int64(sp, &t);
if (ret == 0)
ret = krb5_ret_uint64(sp, &nonce);
krb5_storage_free(sp);
sp = NULL;
if (ret == 0)
*age = time(NULL) - t;
} else {
t = time(NULL);
krb5_generate_random_block((void *)&nonce, sizeof(nonce));
}
if (ret == 0 && (sp = krb5_storage_emem()) == NULL)
ret = krb5_enomem(r->context);
if (ret == 0)
ret = krb5_store_int64(sp, t);
if (ret == 0)
ret = krb5_store_uint64(sp, nonce);
if (ret == 0)
ret = mac_csrf_token(r, sp);
if (ret == 0)
ret = krb5_storage_to_data(sp, &data);
if (ret == 0 && data.length > INT_MAX)
ret = ERANGE;
if (ret == 0 &&
(dlen = rk_base64_encode(data.data, data.length, token)) < 0)
ret = errno;
if (ret == 0 && dlen >= sizeof(tokenbuf))
ret = ERANGE;
if (ret == 0) {
/*
* Work around for older versions of libmicrohttpd do not strdup()ing
* response header values.
*/
memcpy(tokenbuf, *token, dlen);
free(*token);
*token = tokenbuf;
}
krb5_storage_free(sp);
krb5_data_free(&data);
return ret;
}
/*
* Returns system or krb5_error_code on error, but also calls resp() or bad_*()
* on error.
*/
static krb5_error_code
check_csrf(kadmin_request_desc r)
{
krb5_error_code ret;
const char *given;
int64_t age;
size_t givenlen, expectedlen;
char *expected = NULL;
given = MHD_lookup_connection_value(r->connection, MHD_HEADER_KIND,
"X-CSRF-Token");
ret = make_csrf_token(r, given, &expected, &age);
if (ret)
return bad_503(r, ret, "Could not create a CSRF token");
/*
* If CSRF token needed but missing, call resp() directly, bypassing
* bad_403(), to return a 403 with an expected CSRF token in the response.
*/
if (given == NULL) {
(void) resp(r, MHD_HTTP_FORBIDDEN, ENOSYS, MHD_RESPMEM_PERSISTENT,
NULL, "CSRF token needed; copy the X-CSRF-Token: response "
"header to your next POST", BODYLEN_IS_STRLEN, NULL,
expected);
return ENOSYS;
}
/* Validate the CSRF token for this request */
givenlen = strlen(given);
expectedlen = strlen(expected);
if (givenlen != expectedlen || ct_memcmp(given, expected, givenlen)) {
(void) bad_403(r, EACCES, "Invalid CSRF token");
return EACCES;
}
if (age > 300) { /* XXX */
(void) bad_403(r, EACCES, "CSRF token too old");
return EACCES;
}
return 0;
}
static krb5_error_code
health(const char *method, kadmin_request_desc r)
{
if (strcmp(method, "HEAD") == 0) {
return resp(r, MHD_HTTP_OK, 0, MHD_RESPMEM_PERSISTENT, NULL, "", 0,
NULL, NULL);
}
return resp(r, MHD_HTTP_OK, 0, MHD_RESPMEM_PERSISTENT, NULL,
"To determine the health of the service, use the /get-config "
"end-point.\n", BODYLEN_IS_STRLEN, NULL, NULL);
}
/* Implements the entirety of this REST service */
static int
route(void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ctx)
{
static int aptr = 0;
struct kadmin_request_desc r;
int ret;
if (*ctx == NULL) {
/*
* This is the first call, right after headers were read.
*
* We must return quickly so that any 100-Continue might be sent with
* celerity.
*
* We'll get called again to really do the processing. If we handled
* POSTs then we'd also get called with upload_data != NULL between the
* first and last calls. We need to keep no state between the first
* and last calls, but we do need to distinguish first and last call,
* so we use the ctx argument for this.
*/
*ctx = &aptr;
return MHD_YES;
}
/*
* Note that because we attempt to connect to the HDB in set_req_desc(),
* this early 503 if we fail to serves to do all of what /health should do.
*/
if ((ret = set_req_desc(connection, method, url, &r)))
return bad_503(&r, ret, "Could not initialize request state");
if ((strcmp(method, "HEAD") == 0 || strcmp(method, "GET") == 0) &&
(strcmp(url, "/health") == 0 || strcmp(url, "/") == 0)) {
ret = health(method, &r);
} else if (strcmp(method, "GET") != 0 && strcmp(method, "POST") != 0) {
ret = bad_405(&r, method);
} else if (strcmp(url, "/get-keys") == 0) {
ret = get_keys(&r, method);
} else if (strcmp(url, "/get-config") == 0) {
if (strcmp(method, "GET") != 0)
ret = bad_405(&r, method);
else
ret = get_config(&r);
} else {
ret = bad_404(&r, url);
}
clean_req_desc(&r);
return ret == -1 ? MHD_NO : MHD_YES;
}
static struct getargs args[] = {
{ "help", 'h', arg_flag, &help_flag, "Print usage message", NULL },
{ "version", '\0', arg_flag, &version_flag, "Print version", NULL },
{ NULL, 'H', arg_strings, &audiences,
"expected token audience(s) of the service", "HOSTNAME" },
{ "daemon", 'd', arg_flag, &daemonize, "daemonize", "daemonize" },
{ "daemon-child", 0, arg_flag, &daemon_child_fd, NULL, NULL }, /* priv */
{ "reverse-proxied", 0, arg_flag, &reverse_proxied_flag,
"reverse proxied", "listen on 127.0.0.1 and do not use TLS" },
{ NULL, 'p', arg_integer, &port, "PORT", "port number (default: 443)" },
{ "temp-dir", 0, arg_string, &cache_dir,
"cache directory", "DIRECTORY" },
{ "cert", 0, arg_string, &cert_file,
"certificate file path (PEM)", "HX509-STORE" },
{ "private-key", 0, arg_string, &priv_key_file,
"private key file path (PEM)", "HX509-STORE" },
{ "thread-per-client", 't', arg_flag, &thread_per_client_flag, "thread per-client", NULL },
{ "realm", 0, arg_string, &realm, "realm", "REALM" },
{ "hdb", 0, arg_string, &hdb, "HDB filename", "PATH" },
{ "read-only-admin-server", 0, arg_string, &kadmin_server,
"Name of read-only kadmin server", "HOST[:PORT]" },
{ "writable-admin-server", 0, arg_string, &writable_kadmin_server,
"Name of writable kadmin server", "HOST[:PORT]" },
{ "primary-server-uri", 0, arg_string, &primary_server_URI,
"Name of primary httpkadmind server for HTTP redirects", "URL" },
{ "local", 'l', arg_flag, &local_hdb,
"Use a local HDB as read-only", NULL },
{ "local-read-only", 0, arg_flag, &local_hdb_read_only,
"Use a local HDB as read-only", NULL },
{ "read-only", 0, arg_flag, &read_only, "Allow no writes", NULL },
{ "stash-file", 0, arg_string, &stash_file,
"Stash file for HDB", "PATH" },
{ "kadmin-client-name", 0, arg_string, &kadmin_client_name,
"Client name for remote kadmind", "PRINCIPAL" },
{ "kadmin-client-keytab", 0, arg_string, &kadmin_client_keytab,
"Keytab with client credentials for remote kadmind", "KEYTAB" },
{ "token-authentication-type", 'T', arg_strings, &auth_types,
"Token authentication type(s) supported", "HTTP-AUTH-TYPE" },
{ "verbose", 'v', arg_counter, &verbose_counter, "verbose", "run verbosely" }
};
static int
usage(int e)
{
arg_printusage(args, sizeof(args) / sizeof(args[0]), "httpkadmind",
"\nServes an HTTP API for getting (and rotating) service "
"principal keys, and other kadmin-like operations\n");
exit(e);
}
static int sigpipe[2] = { -1, -1 };
static void
sighandler(int sig)
{
char c = sig;
while (write(sigpipe[1], &c, sizeof(c)) == -1 && errno == EINTR)
;
}
static void
my_openlog(krb5_context context,
const char *svc,
krb5_log_facility **fac)
{
char **s = NULL, **p;
krb5_initlog(context, "httpkadmind", fac);
s = krb5_config_get_strings(context, NULL, svc, "logging", NULL);
if (s == NULL)
s = krb5_config_get_strings(context, NULL, "logging", svc, NULL);
if (s) {
for(p = s; *p; p++)
krb5_addlog_dest(context, *fac, *p);
krb5_config_free_strings(s);
} else {
char *ss;
if (asprintf(&ss, "0-1/FILE:%s/%s", hdb_db_dir(context),
KDC_LOG_FILE) < 0)
err(1, "out of memory");
krb5_addlog_dest(context, *fac, ss);
free(ss);
}
krb5_set_warn_dest(context, *fac);
}
static const char *sysplugin_dirs[] = {
#ifdef _WIN32
"$ORIGIN",
#else
"$ORIGIN/../lib/plugin/kdc",
#endif
#ifdef __APPLE__
LIBDIR "/plugin/kdc",
#endif
NULL
};
static void
load_plugins(krb5_context context)
{
const char * const *dirs = sysplugin_dirs;
#ifndef _WIN32
char **cfdirs;
cfdirs = krb5_config_get_strings(context, NULL, "kdc", "plugin_dir", NULL);
if (cfdirs)
dirs = (const char * const *)cfdirs;
#endif
/* XXX kdc? */
_krb5_load_plugins(context, "kdc", (const char **)dirs);
#ifndef _WIN32
krb5_config_free_strings(cfdirs);
#endif
}
int
main(int argc, char **argv)
{
unsigned int flags = MHD_USE_THREAD_PER_CONNECTION; /* XXX */
struct sockaddr_in sin;
struct MHD_Daemon *previous = NULL;
struct MHD_Daemon *current = NULL;
struct sigaction sa;
krb5_context context = NULL;
MHD_socket sock = MHD_INVALID_SOCKET;
void *kadm_handle;
char *priv_key_pem = NULL;
char *cert_pem = NULL;
char sig;
int optidx = 0;
int ret;
setprogname("httpkadmind");
if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
usage(1);
if (help_flag)
usage(0);
if (version_flag) {
print_version(NULL);
exit(0);
}
if (argc > optidx) /* Add option to set a URI local part prefix? */
usage(1);
if (port < 0)
errx(1, "Port number must be given");
if (audiences.num_strings == 0) {
char localhost[MAXHOSTNAMELEN];
ret = gethostname(localhost, sizeof(localhost));
if (ret == -1)
errx(1, "Could not determine local hostname; use --audience");
if ((audiences.strings =
calloc(1, sizeof(audiences.strings[0]))) == NULL ||
(audiences.strings[0] = strdup(localhost)) == NULL)
err(1, "Out of memory");
audiences.num_strings = 1;
}
if (daemonize && daemon_child_fd == -1)
daemon_child_fd = roken_detach_prep(argc, argv, "--daemon-child");
daemonize = 0;
argc -= optidx;
argv += optidx;
if ((errno = pthread_key_create(&k5ctx, k5_free_context)))
err(1, "Could not create thread-specific storage");
if ((errno = get_krb5_context(&context)))
err(1, "Could not init krb5 context (config file issue?)");
if (!realm) {
char *s;
ret = krb5_get_default_realm(context, &s);
if (ret)
krb5_err(context, 1, ret, "Could not determine default realm");
realm = s;
}
if ((errno = get_kadm_handle(context, realm, 0 /* want_write */,
&kadm_handle)))
err(1, "Could not connect to HDB");
kadm5_destroy(kadm_handle);
my_openlog(context, "httpkadmind", &logfac);
load_plugins(context);
if (cache_dir == NULL) {
char *s = NULL;
if (asprintf(&s, "%s/httpkadmind-XXXXXX",
getenv("TMPDIR") ? getenv("TMPDIR") : "/tmp") == -1 ||
s == NULL ||
(cache_dir = mkdtemp(s)) == NULL)
err(1, "could not create temporary cache directory");
if (verbose_counter)
fprintf(stderr, "Note: using %s as cache directory\n", cache_dir);
atexit(rm_cache_dir);
setenv("TMPDIR", cache_dir, 1);
}
again:
if (cert_file && !priv_key_file)
priv_key_file = cert_file;
if (cert_file) {
hx509_cursor cursor = NULL;
hx509_certs certs = NULL;
hx509_cert cert = NULL;
time_t min_cert_life = 0;
size_t len;
void *s;
ret = hx509_certs_init(context->hx509ctx, cert_file, 0, NULL, &certs);
if (ret == 0)
ret = hx509_certs_start_seq(context->hx509ctx, certs, &cursor);
while (ret == 0 &&
(ret = hx509_certs_next_cert(context->hx509ctx, certs,
cursor, &cert)) == 0 && cert) {
time_t notAfter = 0;
if (!hx509_cert_have_private_key_only(cert) &&
(notAfter = hx509_cert_get_notAfter(cert)) <= time(NULL) + 30)
errx(1, "One or more certificates in %s are expired",
cert_file);
if (notAfter) {
notAfter -= time(NULL);
if (notAfter < 600)
warnx("One or more certificates in %s expire soon",
cert_file);
/* Reload 5 minutes prior to expiration */
if (notAfter < min_cert_life || min_cert_life < 1)
min_cert_life = notAfter;
}
hx509_cert_free(cert);
}
if (certs)
(void) hx509_certs_end_seq(context->hx509ctx, certs, cursor);
if (min_cert_life > 4)
alarm(min_cert_life >> 1);
hx509_certs_free(&certs);
if (ret)
hx509_err(context->hx509ctx, 1, ret,
"could not read certificate from %s", cert_file);
if ((errno = rk_undumpdata(cert_file, &s, &len)) ||
(cert_pem = strndup(s, len)) == NULL)
err(1, "could not read certificate from %s", cert_file);
if (strlen(cert_pem) != len)
err(1, "NULs in certificate file contents: %s", cert_file);
free(s);
}
if (priv_key_file) {
size_t len;
void *s;
if ((errno = rk_undumpdata(priv_key_file, &s, &len)) ||
(priv_key_pem = strndup(s, len)) == NULL)
err(1, "could not read private key from %s", priv_key_file);
if (strlen(priv_key_pem) != len)
err(1, "NULs in private key file contents: %s", priv_key_file);
free(s);
}
if (verbose_counter > 1)
flags |= MHD_USE_DEBUG;
if (thread_per_client_flag)
flags |= MHD_USE_THREAD_PER_CONNECTION;
if (pipe(sigpipe) == -1)
err(1, "Could not set up key/cert reloading");
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sighandler;
if (reverse_proxied_flag) {
/*
* We won't use TLS in the reverse proxy case, so no need to reload
* certs. But we'll still read them if given, and alarm() will get
* called.
*
* XXX We should be able to re-read krb5.conf and such on SIGHUP.
*/
(void) signal(SIGHUP, SIG_IGN);
(void) signal(SIGUSR1, SIG_IGN);
(void) signal(SIGALRM, SIG_IGN);
} else {
(void) sigaction(SIGHUP, &sa, NULL); /* Reload key & cert */
(void) sigaction(SIGUSR1, &sa, NULL); /* Reload key & cert */
(void) sigaction(SIGALRM, &sa, NULL); /* Reload key & cert */
}
(void) sigaction(SIGINT, &sa, NULL); /* Graceful shutdown */
(void) sigaction(SIGTERM, &sa, NULL); /* Graceful shutdown */
(void) signal(SIGPIPE, SIG_IGN);
if (previous)
sock = MHD_quiesce_daemon(previous);
if (reverse_proxied_flag) {
/*
* XXX IPv6 too. Create the sockets and tell MHD_start_daemon() about
* them.
*/
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
current = MHD_start_daemon(flags, port,
NULL, NULL,
route, (char *)NULL,
MHD_OPTION_SOCK_ADDR, &sin,
MHD_OPTION_CONNECTION_LIMIT, (unsigned int)200,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int)10,
MHD_OPTION_END);
} else if (sock != MHD_INVALID_SOCKET) {
/*
* Certificate/key rollover: reuse the listen socket returned by
* MHD_quiesce_daemon().
*/
current = MHD_start_daemon(flags | MHD_USE_SSL, port,
NULL, NULL,
route, (char *)NULL,
MHD_OPTION_HTTPS_MEM_KEY, priv_key_pem,
MHD_OPTION_HTTPS_MEM_CERT, cert_pem,
MHD_OPTION_CONNECTION_LIMIT, (unsigned int)200,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int)10,
MHD_OPTION_LISTEN_SOCKET, sock,
MHD_OPTION_END);
sock = MHD_INVALID_SOCKET;
} else {
current = MHD_start_daemon(flags | MHD_USE_SSL, port,
NULL, NULL,
route, (char *)NULL,
MHD_OPTION_HTTPS_MEM_KEY, priv_key_pem,
MHD_OPTION_HTTPS_MEM_CERT, cert_pem,
MHD_OPTION_CONNECTION_LIMIT, (unsigned int)200,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int)10,
MHD_OPTION_END);
}
if (current == NULL)
err(1, "Could not start kadmin REST service");
if (previous) {
MHD_stop_daemon(previous);
previous = NULL;
}
if (verbose_counter)
fprintf(stderr, "Ready!\n");
if (daemon_child_fd != -1)
roken_detach_finish(NULL, daemon_child_fd);
/* Wait for signal, possibly SIGALRM, to reload certs and/or exit */
while ((ret = read(sigpipe[0], &sig, sizeof(sig))) == -1 &&
errno == EINTR)
;
free(priv_key_pem);
free(cert_pem);
priv_key_pem = NULL;
cert_pem = NULL;
if (ret == 1 && (sig == SIGHUP || sig == SIGUSR1 || sig == SIGALRM)) {
/* Reload certs and restart service gracefully */
previous = current;
current = NULL;
goto again;
}
MHD_stop_daemon(current);
_krb5_unload_plugins(context, "kdc");
pthread_key_delete(k5ctx);
return 0;
}
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