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postgres/src/backend/libpq/auth.c
Magnus Hagander b3daac5a9c Add support for RADIUS authentication.
2010-01-27 12:12:00 +00:00

2781 lines
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/*-------------------------------------------------------------------------
*
* auth.c
* Routines to handle network authentication
*
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.192 2010/01/27 12:11:59 mha Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/param.h>
#include <sys/socket.h>
#if defined(HAVE_STRUCT_CMSGCRED) || defined(HAVE_STRUCT_FCRED) || defined(HAVE_STRUCT_SOCKCRED)
#include <sys/uio.h>
#include <sys/ucred.h>
#endif
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stddef.h>
#include "libpq/auth.h"
#include "libpq/crypt.h"
#include "libpq/ip.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
#include "libpq/md5.h"
#include "miscadmin.h"
#include "storage/ipc.h"
/*----------------------------------------------------------------
* Global authentication functions
*----------------------------------------------------------------
*/
static void sendAuthRequest(Port *port, AuthRequest areq);
static void auth_failed(Port *port, int status);
static char *recv_password_packet(Port *port);
static int recv_and_check_password_packet(Port *port);
/*----------------------------------------------------------------
* Ident authentication
*----------------------------------------------------------------
*/
/* Max size of username ident server can return */
#define IDENT_USERNAME_MAX 512
/* Standard TCP port number for Ident service. Assigned by IANA */
#define IDENT_PORT 113
static int authident(hbaPort *port);
/*----------------------------------------------------------------
* PAM authentication
*----------------------------------------------------------------
*/
#ifdef USE_PAM
#ifdef HAVE_PAM_PAM_APPL_H
#include <pam/pam_appl.h>
#endif
#ifdef HAVE_SECURITY_PAM_APPL_H
#include <security/pam_appl.h>
#endif
#define PGSQL_PAM_SERVICE "postgresql" /* Service name passed to PAM */
static int CheckPAMAuth(Port *port, char *user, char *password);
static int pam_passwd_conv_proc(int num_msg, const struct pam_message ** msg,
struct pam_response ** resp, void *appdata_ptr);
static struct pam_conv pam_passw_conv = {
&pam_passwd_conv_proc,
NULL
};
static char *pam_passwd = NULL; /* Workaround for Solaris 2.6 brokenness */
static Port *pam_port_cludge; /* Workaround for passing "Port *port" into
* pam_passwd_conv_proc */
#endif /* USE_PAM */
/*----------------------------------------------------------------
* LDAP authentication
*----------------------------------------------------------------
*/
#ifdef USE_LDAP
#ifndef WIN32
/* We use a deprecated function to keep the codepath the same as win32. */
#define LDAP_DEPRECATED 1
#include <ldap.h>
#else
#include <winldap.h>
/* Correct header from the Platform SDK */
typedef
ULONG (*__ldap_start_tls_sA) (
IN PLDAP ExternalHandle,
OUT PULONG ServerReturnValue,
OUT LDAPMessage **result,
IN PLDAPControlA * ServerControls,
IN PLDAPControlA * ClientControls
);
#endif
static int CheckLDAPAuth(Port *port);
#endif /* USE_LDAP */
/*----------------------------------------------------------------
* Cert authentication
*----------------------------------------------------------------
*/
#ifdef USE_SSL
static int CheckCertAuth(Port *port);
#endif
/*----------------------------------------------------------------
* Kerberos and GSSAPI GUCs
*----------------------------------------------------------------
*/
char *pg_krb_server_keyfile;
char *pg_krb_srvnam;
bool pg_krb_caseins_users;
/*----------------------------------------------------------------
* MIT Kerberos authentication system - protocol version 5
*----------------------------------------------------------------
*/
#ifdef KRB5
static int pg_krb5_recvauth(Port *port);
#include <krb5.h>
/* Some old versions of Kerberos do not include <com_err.h> in <krb5.h> */
#if !defined(__COM_ERR_H) && !defined(__COM_ERR_H__)
#include <com_err.h>
#endif
/*
* Various krb5 state which is not connection specfic, and a flag to
* indicate whether we have initialised it yet.
*/
static int pg_krb5_initialised;
static krb5_context pg_krb5_context;
static krb5_keytab pg_krb5_keytab;
static krb5_principal pg_krb5_server;
#endif /* KRB5 */
/*----------------------------------------------------------------
* GSSAPI Authentication
*----------------------------------------------------------------
*/
#ifdef ENABLE_GSS
#if defined(HAVE_GSSAPI_H)
#include <gssapi.h>
#else
#include <gssapi/gssapi.h>
#endif
static int pg_GSS_recvauth(Port *port);
#endif /* ENABLE_GSS */
/*----------------------------------------------------------------
* SSPI Authentication
*----------------------------------------------------------------
*/
#ifdef ENABLE_SSPI
typedef SECURITY_STATUS
(WINAPI * QUERY_SECURITY_CONTEXT_TOKEN_FN) (
PCtxtHandle, void **);
static int pg_SSPI_recvauth(Port *port);
#endif
/*----------------------------------------------------------------
* RADIUS Authentication
*----------------------------------------------------------------
*/
#ifdef USE_SSL
#include <openssl/rand.h>
#endif
static int CheckRADIUSAuth(Port *port);
/*
* Maximum accepted size of GSS and SSPI authentication tokens.
*
* Kerberos tickets are usually quite small, but the TGTs issued by Windows
* domain controllers include an authorization field known as the Privilege
* Attribute Certificate (PAC), which contains the user's Windows permissions
* (group memberships etc.). The PAC is copied into all tickets obtained on
* the basis of this TGT (even those issued by Unix realms which the Windows
* realm trusts), and can be several kB in size. The maximum token size
* accepted by Windows systems is determined by the MaxAuthToken Windows
* registry setting. Microsoft recommends that it is not set higher than
* 65535 bytes, so that seems like a reasonable limit for us as well.
*/
#define PG_MAX_AUTH_TOKEN_LENGTH 65535
/*----------------------------------------------------------------
* Global authentication functions
*----------------------------------------------------------------
*/
/*
* Tell the user the authentication failed, but not (much about) why.
*
* There is a tradeoff here between security concerns and making life
* unnecessarily difficult for legitimate users. We would not, for example,
* want to report the password we were expecting to receive...
* But it seems useful to report the username and authorization method
* in use, and these are items that must be presumed known to an attacker
* anyway.
* Note that many sorts of failure report additional information in the
* postmaster log, which we hope is only readable by good guys.
*/
static void
auth_failed(Port *port, int status)
{
const char *errstr;
/*
* If we failed due to EOF from client, just quit; there's no point in
* trying to send a message to the client, and not much point in logging
* the failure in the postmaster log. (Logging the failure might be
* desirable, were it not for the fact that libpq closes the connection
* unceremoniously if challenged for a password when it hasn't got one to
* send. We'll get a useless log entry for every psql connection under
* password auth, even if it's perfectly successful, if we log STATUS_EOF
* events.)
*/
if (status == STATUS_EOF)
proc_exit(0);
switch (port->hba->auth_method)
{
case uaReject:
errstr = gettext_noop("authentication failed for user \"%s\": host rejected");
break;
case uaKrb5:
errstr = gettext_noop("Kerberos 5 authentication failed for user \"%s\"");
break;
case uaGSS:
errstr = gettext_noop("GSSAPI authentication failed for user \"%s\"");
break;
case uaSSPI:
errstr = gettext_noop("SSPI authentication failed for user \"%s\"");
break;
case uaTrust:
errstr = gettext_noop("\"trust\" authentication failed for user \"%s\"");
break;
case uaIdent:
errstr = gettext_noop("Ident authentication failed for user \"%s\"");
break;
case uaMD5:
case uaPassword:
errstr = gettext_noop("password authentication failed for user \"%s\"");
break;
case uaPAM:
errstr = gettext_noop("PAM authentication failed for user \"%s\"");
break;
case uaLDAP:
errstr = gettext_noop("LDAP authentication failed for user \"%s\"");
break;
case uaRADIUS:
errstr = gettext_noop("RADIUS authentication failed for user \"%s\"");
break;
default:
errstr = gettext_noop("authentication failed for user \"%s\": invalid authentication method");
break;
}
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(errstr, port->user_name)));
/* doesn't return */
}
/*
* Client authentication starts here. If there is an error, this
* function does not return and the backend process is terminated.
*/
void
ClientAuthentication(Port *port)
{
int status = STATUS_ERROR;
/*
* Get the authentication method to use for this frontend/database
* combination. Note: a failure return indicates a problem with the hba
* config file, not with the request. hba.c should have dropped an error
* message into the postmaster logfile if it failed.
*/
if (hba_getauthmethod(port) != STATUS_OK)
ereport(FATAL,
(errcode(ERRCODE_CONFIG_FILE_ERROR),
errmsg("missing or erroneous pg_hba.conf file"),
errhint("See server log for details.")));
/*
* Enable immediate response to SIGTERM/SIGINT/timeout interrupts.
* (We don't want this during hba_getauthmethod() because it might
* have to do database access, eg for role membership checks.)
*/
ImmediateInterruptOK = true;
/* And don't forget to detect one that already arrived */
CHECK_FOR_INTERRUPTS();
/*
* This is the first point where we have access to the hba record for the
* current connection, so perform any verifications based on the hba
* options field that should be done *before* the authentication here.
*/
if (port->hba->clientcert)
{
/*
* When we parse pg_hba.conf, we have already made sure that we have
* been able to load a certificate store. Thus, if a certificate is
* present on the client, it has been verified against our root
* certificate store, and the connection would have been aborted
* already if it didn't verify ok.
*/
#ifdef USE_SSL
if (!port->peer)
{
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("connection requires a valid client certificate")));
}
#else
/*
* hba.c makes sure hba->clientcert can't be set unless OpenSSL is
* present.
*/
Assert(false);
#endif
}
/*
* Now proceed to do the actual authentication check
*/
switch (port->hba->auth_method)
{
case uaReject:
/*
* This could have come from an explicit "reject" entry in
* pg_hba.conf, but more likely it means there was no matching
* entry. Take pity on the poor user and issue a helpful error
* message. NOTE: this is not a security breach, because all the
* info reported here is known at the frontend and must be assumed
* known to bad guys. We're merely helping out the less clueful
* good guys.
*/
{
char hostinfo[NI_MAXHOST];
pg_getnameinfo_all(&port->raddr.addr, port->raddr.salen,
hostinfo, sizeof(hostinfo),
NULL, 0,
NI_NUMERICHOST);
#ifdef USE_SSL
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("no pg_hba.conf entry for host \"%s\", user \"%s\", database \"%s\", %s",
hostinfo, port->user_name, port->database_name,
port->ssl ? _("SSL on") : _("SSL off"))));
#else
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("no pg_hba.conf entry for host \"%s\", user \"%s\", database \"%s\"",
hostinfo, port->user_name, port->database_name)));
#endif
break;
}
case uaKrb5:
#ifdef KRB5
sendAuthRequest(port, AUTH_REQ_KRB5);
status = pg_krb5_recvauth(port);
#else
Assert(false);
#endif
break;
case uaGSS:
#ifdef ENABLE_GSS
sendAuthRequest(port, AUTH_REQ_GSS);
status = pg_GSS_recvauth(port);
#else
Assert(false);
#endif
break;
case uaSSPI:
#ifdef ENABLE_SSPI
sendAuthRequest(port, AUTH_REQ_SSPI);
status = pg_SSPI_recvauth(port);
#else
Assert(false);
#endif
break;
case uaIdent:
/*
* If we are doing ident on unix-domain sockets, use SCM_CREDS
* only if it is defined and SO_PEERCRED isn't.
*/
#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && \
(defined(HAVE_STRUCT_CMSGCRED) || defined(HAVE_STRUCT_FCRED) || \
(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS)))
if (port->raddr.addr.ss_family == AF_UNIX)
{
#if defined(HAVE_STRUCT_FCRED) || defined(HAVE_STRUCT_SOCKCRED)
/*
* Receive credentials on next message receipt, BSD/OS,
* NetBSD. We need to set this before the client sends the
* next packet.
*/
int on = 1;
if (setsockopt(port->sock, 0, LOCAL_CREDS, &on, sizeof(on)) < 0)
ereport(FATAL,
(errcode_for_socket_access(),
errmsg("could not enable credential reception: %m")));
#endif
sendAuthRequest(port, AUTH_REQ_SCM_CREDS);
}
#endif
status = authident(port);
break;
case uaMD5:
if (Db_user_namespace)
ereport(FATAL,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("MD5 authentication is not supported when \"db_user_namespace\" is enabled")));
sendAuthRequest(port, AUTH_REQ_MD5);
status = recv_and_check_password_packet(port);
break;
case uaPassword:
sendAuthRequest(port, AUTH_REQ_PASSWORD);
status = recv_and_check_password_packet(port);
break;
case uaPAM:
#ifdef USE_PAM
status = CheckPAMAuth(port, port->user_name, "");
#else
Assert(false);
#endif /* USE_PAM */
break;
case uaLDAP:
#ifdef USE_LDAP
status = CheckLDAPAuth(port);
#else
Assert(false);
#endif
break;
case uaCert:
#ifdef USE_SSL
status = CheckCertAuth(port);
#else
Assert(false);
#endif
break;
case uaRADIUS:
status = CheckRADIUSAuth(port);
break;
case uaTrust:
status = STATUS_OK;
break;
}
if (status == STATUS_OK)
sendAuthRequest(port, AUTH_REQ_OK);
else
auth_failed(port, status);
/* Done with authentication, so we should turn off immediate interrupts */
ImmediateInterruptOK = false;
}
/*
* Send an authentication request packet to the frontend.
*/
static void
sendAuthRequest(Port *port, AuthRequest areq)
{
StringInfoData buf;
pq_beginmessage(&buf, 'R');
pq_sendint(&buf, (int32) areq, sizeof(int32));
/* Add the salt for encrypted passwords. */
if (areq == AUTH_REQ_MD5)
pq_sendbytes(&buf, port->md5Salt, 4);
#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
/*
* Add the authentication data for the next step of the GSSAPI or SSPI
* negotiation.
*/
else if (areq == AUTH_REQ_GSS_CONT)
{
if (port->gss->outbuf.length > 0)
{
elog(DEBUG4, "sending GSS token of length %u",
(unsigned int) port->gss->outbuf.length);
pq_sendbytes(&buf, port->gss->outbuf.value, port->gss->outbuf.length);
}
}
#endif
pq_endmessage(&buf);
/*
* Flush message so client will see it, except for AUTH_REQ_OK, which need
* not be sent until we are ready for queries.
*/
if (areq != AUTH_REQ_OK)
pq_flush();
}
/*
* Collect password response packet from frontend.
*
* Returns NULL if couldn't get password, else palloc'd string.
*/
static char *
recv_password_packet(Port *port)
{
StringInfoData buf;
if (PG_PROTOCOL_MAJOR(port->proto) >= 3)
{
/* Expect 'p' message type */
int mtype;
mtype = pq_getbyte();
if (mtype != 'p')
{
/*
* If the client just disconnects without offering a password,
* don't make a log entry. This is legal per protocol spec and in
* fact commonly done by psql, so complaining just clutters the
* log.
*/
if (mtype != EOF)
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("expected password response, got message type %d",
mtype)));
return NULL; /* EOF or bad message type */
}
}
else
{
/* For pre-3.0 clients, avoid log entry if they just disconnect */
if (pq_peekbyte() == EOF)
return NULL; /* EOF */
}
initStringInfo(&buf);
if (pq_getmessage(&buf, 1000)) /* receive password */
{
/* EOF - pq_getmessage already logged a suitable message */
pfree(buf.data);
return NULL;
}
/*
* Apply sanity check: password packet length should agree with length of
* contained string. Note it is safe to use strlen here because
* StringInfo is guaranteed to have an appended '\0'.
*/
if (strlen(buf.data) + 1 != buf.len)
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("invalid password packet size")));
/* Do not echo password to logs, for security. */
ereport(DEBUG5,
(errmsg("received password packet")));
/*
* Return the received string. Note we do not attempt to do any
* character-set conversion on it; since we don't yet know the client's
* encoding, there wouldn't be much point.
*/
return buf.data;
}
/*----------------------------------------------------------------
* MD5 authentication
*----------------------------------------------------------------
*/
/*
* Called when we have sent an authorization request for a password.
* Get the response and check it.
*/
static int
recv_and_check_password_packet(Port *port)
{
char *passwd;
int result;
passwd = recv_password_packet(port);
if (passwd == NULL)
return STATUS_EOF; /* client wouldn't send password */
result = md5_crypt_verify(port, port->user_name, passwd);
pfree(passwd);
return result;
}
/*----------------------------------------------------------------
* MIT Kerberos authentication system - protocol version 5
*----------------------------------------------------------------
*/
#ifdef KRB5
static int
pg_krb5_init(Port *port)
{
krb5_error_code retval;
char *khostname;
if (pg_krb5_initialised)
return STATUS_OK;
retval = krb5_init_context(&pg_krb5_context);
if (retval)
{
ereport(LOG,
(errmsg("Kerberos initialization returned error %d",
retval)));
com_err("postgres", retval, "while initializing krb5");
return STATUS_ERROR;
}
retval = krb5_kt_resolve(pg_krb5_context, pg_krb_server_keyfile, &pg_krb5_keytab);
if (retval)
{
ereport(LOG,
(errmsg("Kerberos keytab resolving returned error %d",
retval)));
com_err("postgres", retval, "while resolving keytab file \"%s\"",
pg_krb_server_keyfile);
krb5_free_context(pg_krb5_context);
return STATUS_ERROR;
}
/*
* If no hostname was specified, pg_krb_server_hostname is already NULL.
* If it's set to blank, force it to NULL.
*/
khostname = port->hba->krb_server_hostname;
if (khostname && khostname[0] == '\0')
khostname = NULL;
retval = krb5_sname_to_principal(pg_krb5_context,
khostname,
pg_krb_srvnam,
KRB5_NT_SRV_HST,
&pg_krb5_server);
if (retval)
{
ereport(LOG,
(errmsg("Kerberos sname_to_principal(\"%s\", \"%s\") returned error %d",
khostname ? khostname : "server hostname", pg_krb_srvnam, retval)));
com_err("postgres", retval,
"while getting server principal for server \"%s\" for service \"%s\"",
khostname ? khostname : "server hostname", pg_krb_srvnam);
krb5_kt_close(pg_krb5_context, pg_krb5_keytab);
krb5_free_context(pg_krb5_context);
return STATUS_ERROR;
}
pg_krb5_initialised = 1;
return STATUS_OK;
}
/*
* pg_krb5_recvauth -- server routine to receive authentication information
* from the client
*
* We still need to compare the username obtained from the client's setup
* packet to the authenticated name.
*
* We have our own keytab file because postgres is unlikely to run as root,
* and so cannot read the default keytab.
*/
static int
pg_krb5_recvauth(Port *port)
{
krb5_error_code retval;
int ret;
krb5_auth_context auth_context = NULL;
krb5_ticket *ticket;
char *kusername;
char *cp;
ret = pg_krb5_init(port);
if (ret != STATUS_OK)
return ret;
retval = krb5_recvauth(pg_krb5_context, &auth_context,
(krb5_pointer) & port->sock, pg_krb_srvnam,
pg_krb5_server, 0, pg_krb5_keytab, &ticket);
if (retval)
{
ereport(LOG,
(errmsg("Kerberos recvauth returned error %d",
retval)));
com_err("postgres", retval, "from krb5_recvauth");
return STATUS_ERROR;
}
/*
* The "client" structure comes out of the ticket and is therefore
* authenticated. Use it to check the username obtained from the
* postmaster startup packet.
*/
#if defined(HAVE_KRB5_TICKET_ENC_PART2)
retval = krb5_unparse_name(pg_krb5_context,
ticket->enc_part2->client, &kusername);
#elif defined(HAVE_KRB5_TICKET_CLIENT)
retval = krb5_unparse_name(pg_krb5_context,
ticket->client, &kusername);
#else
#error "bogus configuration"
#endif
if (retval)
{
ereport(LOG,
(errmsg("Kerberos unparse_name returned error %d",
retval)));
com_err("postgres", retval, "while unparsing client name");
krb5_free_ticket(pg_krb5_context, ticket);
krb5_auth_con_free(pg_krb5_context, auth_context);
return STATUS_ERROR;
}
cp = strchr(kusername, '@');
if (cp)
{
/*
* If we are not going to include the realm in the username that is
* passed to the ident map, destructively modify it here to remove the
* realm. Then advance past the separator to check the realm.
*/
if (!port->hba->include_realm)
*cp = '\0';
cp++;
if (port->hba->krb_realm != NULL && strlen(port->hba->krb_realm))
{
/* Match realm against configured */
if (pg_krb_caseins_users)
ret = pg_strcasecmp(port->hba->krb_realm, cp);
else
ret = strcmp(port->hba->krb_realm, cp);
if (ret)
{
elog(DEBUG2,
"krb5 realm (%s) and configured realm (%s) don't match",
cp, port->hba->krb_realm);
krb5_free_ticket(pg_krb5_context, ticket);
krb5_auth_con_free(pg_krb5_context, auth_context);
return STATUS_ERROR;
}
}
}
else if (port->hba->krb_realm && strlen(port->hba->krb_realm))
{
elog(DEBUG2,
"krb5 did not return realm but realm matching was requested");
krb5_free_ticket(pg_krb5_context, ticket);
krb5_auth_con_free(pg_krb5_context, auth_context);
return STATUS_ERROR;
}
ret = check_usermap(port->hba->usermap, port->user_name, kusername,
pg_krb_caseins_users);
krb5_free_ticket(pg_krb5_context, ticket);
krb5_auth_con_free(pg_krb5_context, auth_context);
free(kusername);
return ret;
}
#endif /* KRB5 */
/*----------------------------------------------------------------
* GSSAPI authentication system
*----------------------------------------------------------------
*/
#ifdef ENABLE_GSS
#if defined(WIN32) && !defined(WIN32_ONLY_COMPILER)
/*
* MIT Kerberos GSSAPI DLL doesn't properly export the symbols for MingW
* that contain the OIDs required. Redefine here, values copied
* from src/athena/auth/krb5/src/lib/gssapi/generic/gssapi_generic.c
*/
static const gss_OID_desc GSS_C_NT_USER_NAME_desc =
{10, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x02"};
static GSS_DLLIMP gss_OID GSS_C_NT_USER_NAME = &GSS_C_NT_USER_NAME_desc;
#endif
static void
pg_GSS_error(int severity, char *errmsg, OM_uint32 maj_stat, OM_uint32 min_stat)
{
gss_buffer_desc gmsg;
OM_uint32 lmaj_s,
lmin_s,
msg_ctx;
char msg_major[128],
msg_minor[128];
/* Fetch major status message */
msg_ctx = 0;
lmaj_s = gss_display_status(&lmin_s, maj_stat, GSS_C_GSS_CODE,
GSS_C_NO_OID, &msg_ctx, &gmsg);
strlcpy(msg_major, gmsg.value, sizeof(msg_major));
gss_release_buffer(&lmin_s, &gmsg);
if (msg_ctx)
/*
* More than one message available. XXX: Should we loop and read all
* messages? (same below)
*/
ereport(WARNING,
(errmsg_internal("incomplete GSS error report")));
/* Fetch mechanism minor status message */
msg_ctx = 0;
lmaj_s = gss_display_status(&lmin_s, min_stat, GSS_C_MECH_CODE,
GSS_C_NO_OID, &msg_ctx, &gmsg);
strlcpy(msg_minor, gmsg.value, sizeof(msg_minor));
gss_release_buffer(&lmin_s, &gmsg);
if (msg_ctx)
ereport(WARNING,
(errmsg_internal("incomplete GSS minor error report")));
/*
* errmsg_internal, since translation of the first part must be done
* before calling this function anyway.
*/
ereport(severity,
(errmsg_internal("%s", errmsg),
errdetail("%s: %s", msg_major, msg_minor)));
}
static int
pg_GSS_recvauth(Port *port)
{
OM_uint32 maj_stat,
min_stat,
lmin_s,
gflags;
int mtype;
int ret;
StringInfoData buf;
gss_buffer_desc gbuf;
/*
* GSS auth is not supported for protocol versions before 3, because it
* relies on the overall message length word to determine the GSS payload
* size in AuthenticationGSSContinue and PasswordMessage messages. (This
* is, in fact, a design error in our GSS support, because protocol
* messages are supposed to be parsable without relying on the length
* word; but it's not worth changing it now.)
*/
if (PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
ereport(FATAL,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("GSSAPI is not supported in protocol version 2")));
if (pg_krb_server_keyfile && strlen(pg_krb_server_keyfile) > 0)
{
/*
* Set default Kerberos keytab file for the Krb5 mechanism.
*
* setenv("KRB5_KTNAME", pg_krb_server_keyfile, 0); except setenv()
* not always available.
*/
if (getenv("KRB5_KTNAME") == NULL)
{
size_t kt_len = strlen(pg_krb_server_keyfile) + 14;
char *kt_path = malloc(kt_len);
if (!kt_path)
{
ereport(LOG,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return STATUS_ERROR;
}
snprintf(kt_path, kt_len, "KRB5_KTNAME=%s", pg_krb_server_keyfile);
putenv(kt_path);
}
}
/*
* We accept any service principal that's present in our keytab. This
* increases interoperability between kerberos implementations that see
* for example case sensitivity differently, while not really opening up
* any vector of attack.
*/
port->gss->cred = GSS_C_NO_CREDENTIAL;
/*
* Initialize sequence with an empty context
*/
port->gss->ctx = GSS_C_NO_CONTEXT;
/*
* Loop through GSSAPI message exchange. This exchange can consist of
* multiple messags sent in both directions. First message is always from
* the client. All messages from client to server are password packets
* (type 'p').
*/
do
{
mtype = pq_getbyte();
if (mtype != 'p')
{
/* Only log error if client didn't disconnect. */
if (mtype != EOF)
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("expected GSS response, got message type %d",
mtype)));
return STATUS_ERROR;
}
/* Get the actual GSS token */
initStringInfo(&buf);
if (pq_getmessage(&buf, PG_MAX_AUTH_TOKEN_LENGTH))
{
/* EOF - pq_getmessage already logged error */
pfree(buf.data);
return STATUS_ERROR;
}
/* Map to GSSAPI style buffer */
gbuf.length = buf.len;
gbuf.value = buf.data;
elog(DEBUG4, "Processing received GSS token of length %u",
(unsigned int) gbuf.length);
maj_stat = gss_accept_sec_context(
&min_stat,
&port->gss->ctx,
port->gss->cred,
&gbuf,
GSS_C_NO_CHANNEL_BINDINGS,
&port->gss->name,
NULL,
&port->gss->outbuf,
&gflags,
NULL,
NULL);
/* gbuf no longer used */
pfree(buf.data);
elog(DEBUG5, "gss_accept_sec_context major: %d, "
"minor: %d, outlen: %u, outflags: %x",
maj_stat, min_stat,
(unsigned int) port->gss->outbuf.length, gflags);
if (port->gss->outbuf.length != 0)
{
/*
* Negotiation generated data to be sent to the client.
*/
OM_uint32 lmin_s;
elog(DEBUG4, "sending GSS response token of length %u",
(unsigned int) port->gss->outbuf.length);
sendAuthRequest(port, AUTH_REQ_GSS_CONT);
gss_release_buffer(&lmin_s, &port->gss->outbuf);
}
if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED)
{
OM_uint32 lmin_s;
gss_delete_sec_context(&lmin_s, &port->gss->ctx, GSS_C_NO_BUFFER);
pg_GSS_error(ERROR,
gettext_noop("accepting GSS security context failed"),
maj_stat, min_stat);
}
if (maj_stat == GSS_S_CONTINUE_NEEDED)
elog(DEBUG4, "GSS continue needed");
} while (maj_stat == GSS_S_CONTINUE_NEEDED);
if (port->gss->cred != GSS_C_NO_CREDENTIAL)
{
/*
* Release service principal credentials
*/
gss_release_cred(&min_stat, &port->gss->cred);
}
/*
* GSS_S_COMPLETE indicates that authentication is now complete.
*
* Get the name of the user that authenticated, and compare it to the pg
* username that was specified for the connection.
*/
maj_stat = gss_display_name(&min_stat, port->gss->name, &gbuf, NULL);
if (maj_stat != GSS_S_COMPLETE)
pg_GSS_error(ERROR,
gettext_noop("retrieving GSS user name failed"),
maj_stat, min_stat);
/*
* Split the username at the realm separator
*/
if (strchr(gbuf.value, '@'))
{
char *cp = strchr(gbuf.value, '@');
/*
* If we are not going to include the realm in the username that is
* passed to the ident map, destructively modify it here to remove the
* realm. Then advance past the separator to check the realm.
*/
if (!port->hba->include_realm)
*cp = '\0';
cp++;
if (port->hba->krb_realm != NULL && strlen(port->hba->krb_realm))
{
/*
* Match the realm part of the name first
*/
if (pg_krb_caseins_users)
ret = pg_strcasecmp(port->hba->krb_realm, cp);
else
ret = strcmp(port->hba->krb_realm, cp);
if (ret)
{
/* GSS realm does not match */
elog(DEBUG2,
"GSSAPI realm (%s) and configured realm (%s) don't match",
cp, port->hba->krb_realm);
gss_release_buffer(&lmin_s, &gbuf);
return STATUS_ERROR;
}
}
}
else if (port->hba->krb_realm && strlen(port->hba->krb_realm))
{
elog(DEBUG2,
"GSSAPI did not return realm but realm matching was requested");
gss_release_buffer(&lmin_s, &gbuf);
return STATUS_ERROR;
}
ret = check_usermap(port->hba->usermap, port->user_name, gbuf.value,
pg_krb_caseins_users);
gss_release_buffer(&lmin_s, &gbuf);
return ret;
}
#endif /* ENABLE_GSS */
/*----------------------------------------------------------------
* SSPI authentication system
*----------------------------------------------------------------
*/
#ifdef ENABLE_SSPI
static void
pg_SSPI_error(int severity, const char *errmsg, SECURITY_STATUS r)
{
char sysmsg[256];
if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, r, 0,
sysmsg, sizeof(sysmsg), NULL) == 0)
ereport(severity,
(errmsg_internal("%s", errmsg),
errdetail("SSPI error %x", (unsigned int) r)));
else
ereport(severity,
(errmsg_internal("%s", errmsg),
errdetail("%s (%x)", sysmsg, (unsigned int) r)));
}
static int
pg_SSPI_recvauth(Port *port)
{
int mtype;
StringInfoData buf;
SECURITY_STATUS r;
CredHandle sspicred;
CtxtHandle *sspictx = NULL,
newctx;
TimeStamp expiry;
ULONG contextattr;
SecBufferDesc inbuf;
SecBufferDesc outbuf;
SecBuffer OutBuffers[1];
SecBuffer InBuffers[1];
HANDLE token;
TOKEN_USER *tokenuser;
DWORD retlen;
char accountname[MAXPGPATH];
char domainname[MAXPGPATH];
DWORD accountnamesize = sizeof(accountname);
DWORD domainnamesize = sizeof(domainname);
SID_NAME_USE accountnameuse;
HMODULE secur32;
QUERY_SECURITY_CONTEXT_TOKEN_FN _QuerySecurityContextToken;
/*
* SSPI auth is not supported for protocol versions before 3, because it
* relies on the overall message length word to determine the SSPI payload
* size in AuthenticationGSSContinue and PasswordMessage messages. (This
* is, in fact, a design error in our SSPI support, because protocol
* messages are supposed to be parsable without relying on the length
* word; but it's not worth changing it now.)
*/
if (PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
ereport(FATAL,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SSPI is not supported in protocol version 2")));
/*
* Acquire a handle to the server credentials.
*/
r = AcquireCredentialsHandle(NULL,
"negotiate",
SECPKG_CRED_INBOUND,
NULL,
NULL,
NULL,
NULL,
&sspicred,
&expiry);
if (r != SEC_E_OK)
pg_SSPI_error(ERROR, _("could not acquire SSPI credentials"), r);
/*
* Loop through SSPI message exchange. This exchange can consist of
* multiple messags sent in both directions. First message is always from
* the client. All messages from client to server are password packets
* (type 'p').
*/
do
{
mtype = pq_getbyte();
if (mtype != 'p')
{
/* Only log error if client didn't disconnect. */
if (mtype != EOF)
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("expected SSPI response, got message type %d",
mtype)));
return STATUS_ERROR;
}
/* Get the actual SSPI token */
initStringInfo(&buf);
if (pq_getmessage(&buf, PG_MAX_AUTH_TOKEN_LENGTH))
{
/* EOF - pq_getmessage already logged error */
pfree(buf.data);
return STATUS_ERROR;
}
/* Map to SSPI style buffer */
inbuf.ulVersion = SECBUFFER_VERSION;
inbuf.cBuffers = 1;
inbuf.pBuffers = InBuffers;
InBuffers[0].pvBuffer = buf.data;
InBuffers[0].cbBuffer = buf.len;
InBuffers[0].BufferType = SECBUFFER_TOKEN;
/* Prepare output buffer */
OutBuffers[0].pvBuffer = NULL;
OutBuffers[0].BufferType = SECBUFFER_TOKEN;
OutBuffers[0].cbBuffer = 0;
outbuf.cBuffers = 1;
outbuf.pBuffers = OutBuffers;
outbuf.ulVersion = SECBUFFER_VERSION;
elog(DEBUG4, "Processing received SSPI token of length %u",
(unsigned int) buf.len);
r = AcceptSecurityContext(&sspicred,
sspictx,
&inbuf,
ASC_REQ_ALLOCATE_MEMORY,
SECURITY_NETWORK_DREP,
&newctx,
&outbuf,
&contextattr,
NULL);
/* input buffer no longer used */
pfree(buf.data);
if (outbuf.cBuffers > 0 && outbuf.pBuffers[0].cbBuffer > 0)
{
/*
* Negotiation generated data to be sent to the client.
*/
elog(DEBUG4, "sending SSPI response token of length %u",
(unsigned int) outbuf.pBuffers[0].cbBuffer);
port->gss->outbuf.length = outbuf.pBuffers[0].cbBuffer;
port->gss->outbuf.value = outbuf.pBuffers[0].pvBuffer;
sendAuthRequest(port, AUTH_REQ_GSS_CONT);
FreeContextBuffer(outbuf.pBuffers[0].pvBuffer);
}
if (r != SEC_E_OK && r != SEC_I_CONTINUE_NEEDED)
{
if (sspictx != NULL)
{
DeleteSecurityContext(sspictx);
free(sspictx);
}
FreeCredentialsHandle(&sspicred);
pg_SSPI_error(ERROR,
_("could not accept SSPI security context"), r);
}
if (sspictx == NULL)
{
sspictx = malloc(sizeof(CtxtHandle));
if (sspictx == NULL)
ereport(ERROR,
(errmsg("out of memory")));
memcpy(sspictx, &newctx, sizeof(CtxtHandle));
}
if (r == SEC_I_CONTINUE_NEEDED)
elog(DEBUG4, "SSPI continue needed");
} while (r == SEC_I_CONTINUE_NEEDED);
/*
* Release service principal credentials
*/
FreeCredentialsHandle(&sspicred);
/*
* SEC_E_OK indicates that authentication is now complete.
*
* Get the name of the user that authenticated, and compare it to the pg
* username that was specified for the connection.
*
* MingW is missing the export for QuerySecurityContextToken in the
* secur32 library, so we have to load it dynamically.
*/
secur32 = LoadLibrary("SECUR32.DLL");
if (secur32 == NULL)
ereport(ERROR,
(errmsg_internal("could not load secur32.dll: %d",
(int) GetLastError())));
_QuerySecurityContextToken = (QUERY_SECURITY_CONTEXT_TOKEN_FN)
GetProcAddress(secur32, "QuerySecurityContextToken");
if (_QuerySecurityContextToken == NULL)
{
FreeLibrary(secur32);
ereport(ERROR,
(errmsg_internal("could not locate QuerySecurityContextToken in secur32.dll: %d",
(int) GetLastError())));
}
r = (_QuerySecurityContextToken) (sspictx, &token);
if (r != SEC_E_OK)
{
FreeLibrary(secur32);
pg_SSPI_error(ERROR,
_("could not get token from SSPI security context"), r);
}
FreeLibrary(secur32);
/*
* No longer need the security context, everything from here on uses the
* token instead.
*/
DeleteSecurityContext(sspictx);
free(sspictx);
if (!GetTokenInformation(token, TokenUser, NULL, 0, &retlen) && GetLastError() != 122)
ereport(ERROR,
(errmsg_internal("could not get token user size: error code %d",
(int) GetLastError())));
tokenuser = malloc(retlen);
if (tokenuser == NULL)
ereport(ERROR,
(errmsg("out of memory")));
if (!GetTokenInformation(token, TokenUser, tokenuser, retlen, &retlen))
ereport(ERROR,
(errmsg_internal("could not get user token: error code %d",
(int) GetLastError())));
if (!LookupAccountSid(NULL, tokenuser->User.Sid, accountname, &accountnamesize,
domainname, &domainnamesize, &accountnameuse))
ereport(ERROR,
(errmsg_internal("could not lookup acconut sid: error code %d",
(int) GetLastError())));
free(tokenuser);
/*
* Compare realm/domain if requested. In SSPI, always compare case
* insensitive.
*/
if (port->hba->krb_realm && strlen(port->hba->krb_realm))
{
if (pg_strcasecmp(port->hba->krb_realm, domainname))
{
elog(DEBUG2,
"SSPI domain (%s) and configured domain (%s) don't match",
domainname, port->hba->krb_realm);
return STATUS_ERROR;
}
}
/*
* We have the username (without domain/realm) in accountname, compare to
* the supplied value. In SSPI, always compare case insensitive.
*
* If set to include realm, append it in <username>@<realm> format.
*/
if (port->hba->include_realm)
{
char *namebuf;
int retval;
namebuf = palloc(strlen(accountname) + strlen(domainname) + 2);
sprintf(namebuf, "%s@%s", accountname, domainname);
retval = check_usermap(port->hba->usermap, port->user_name, namebuf, true);
pfree(namebuf);
return retval;
}
else
return check_usermap(port->hba->usermap, port->user_name, accountname, true);
}
#endif /* ENABLE_SSPI */
/*----------------------------------------------------------------
* Ident authentication system
*----------------------------------------------------------------
*/
/*
* Parse the string "*ident_response" as a response from a query to an Ident
* server. If it's a normal response indicating a user name, return true
* and store the user name at *ident_user. If it's anything else,
* return false.
*/
static bool
interpret_ident_response(const char *ident_response,
char *ident_user)
{
const char *cursor = ident_response; /* Cursor into *ident_response */
/*
* Ident's response, in the telnet tradition, should end in crlf (\r\n).
*/
if (strlen(ident_response) < 2)
return false;
else if (ident_response[strlen(ident_response) - 2] != '\r')
return false;
else
{
while (*cursor != ':' && *cursor != '\r')
cursor++; /* skip port field */
if (*cursor != ':')
return false;
else
{
/* We're positioned to colon before response type field */
char response_type[80];
int i; /* Index into *response_type */
cursor++; /* Go over colon */
while (pg_isblank(*cursor))
cursor++; /* skip blanks */
i = 0;
while (*cursor != ':' && *cursor != '\r' && !pg_isblank(*cursor) &&
i < (int) (sizeof(response_type) - 1))
response_type[i++] = *cursor++;
response_type[i] = '\0';
while (pg_isblank(*cursor))
cursor++; /* skip blanks */
if (strcmp(response_type, "USERID") != 0)
return false;
else
{
/*
* It's a USERID response. Good. "cursor" should be pointing
* to the colon that precedes the operating system type.
*/
if (*cursor != ':')
return false;
else
{
cursor++; /* Go over colon */
/* Skip over operating system field. */
while (*cursor != ':' && *cursor != '\r')
cursor++;
if (*cursor != ':')
return false;
else
{
int i; /* Index into *ident_user */
cursor++; /* Go over colon */
while (pg_isblank(*cursor))
cursor++; /* skip blanks */
/* Rest of line is user name. Copy it over. */
i = 0;
while (*cursor != '\r' && i < IDENT_USERNAME_MAX)
ident_user[i++] = *cursor++;
ident_user[i] = '\0';
return true;
}
}
}
}
}
}
/*
* Talk to the ident server on host "remote_ip_addr" and find out who
* owns the tcp connection from his port "remote_port" to port
* "local_port_addr" on host "local_ip_addr". Return the user name the
* ident server gives as "*ident_user".
*
* IP addresses and port numbers are in network byte order.
*
* But iff we're unable to get the information from ident, return false.
*/
static bool
ident_inet(const SockAddr remote_addr,
const SockAddr local_addr,
char *ident_user)
{
pgsocket sock_fd, /* File descriptor for socket on which we talk
* to Ident */
rc; /* Return code from a locally called function */
bool ident_return;
char remote_addr_s[NI_MAXHOST];
char remote_port[NI_MAXSERV];
char local_addr_s[NI_MAXHOST];
char local_port[NI_MAXSERV];
char ident_port[NI_MAXSERV];
char ident_query[80];
char ident_response[80 + IDENT_USERNAME_MAX];
struct addrinfo *ident_serv = NULL,
*la = NULL,
hints;
/*
* Might look a little weird to first convert it to text and then back to
* sockaddr, but it's protocol independent.
*/
pg_getnameinfo_all(&remote_addr.addr, remote_addr.salen,
remote_addr_s, sizeof(remote_addr_s),
remote_port, sizeof(remote_port),
NI_NUMERICHOST | NI_NUMERICSERV);
pg_getnameinfo_all(&local_addr.addr, local_addr.salen,
local_addr_s, sizeof(local_addr_s),
local_port, sizeof(local_port),
NI_NUMERICHOST | NI_NUMERICSERV);
snprintf(ident_port, sizeof(ident_port), "%d", IDENT_PORT);
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = remote_addr.addr.ss_family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
hints.ai_addrlen = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
rc = pg_getaddrinfo_all(remote_addr_s, ident_port, &hints, &ident_serv);
if (rc || !ident_serv)
{
if (ident_serv)
pg_freeaddrinfo_all(hints.ai_family, ident_serv);
return false; /* we don't expect this to happen */
}
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = local_addr.addr.ss_family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
hints.ai_addrlen = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
rc = pg_getaddrinfo_all(local_addr_s, NULL, &hints, &la);
if (rc || !la)
{
if (la)
pg_freeaddrinfo_all(hints.ai_family, la);
return false; /* we don't expect this to happen */
}
sock_fd = socket(ident_serv->ai_family, ident_serv->ai_socktype,
ident_serv->ai_protocol);
if (sock_fd < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not create socket for Ident connection: %m")));
ident_return = false;
goto ident_inet_done;
}
/*
* Bind to the address which the client originally contacted, otherwise
* the ident server won't be able to match up the right connection. This
* is necessary if the PostgreSQL server is running on an IP alias.
*/
rc = bind(sock_fd, la->ai_addr, la->ai_addrlen);
if (rc != 0)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not bind to local address \"%s\": %m",
local_addr_s)));
ident_return = false;
goto ident_inet_done;
}
rc = connect(sock_fd, ident_serv->ai_addr,
ident_serv->ai_addrlen);
if (rc != 0)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not connect to Ident server at address \"%s\", port %s: %m",
remote_addr_s, ident_port)));
ident_return = false;
goto ident_inet_done;
}
/* The query we send to the Ident server */
snprintf(ident_query, sizeof(ident_query), "%s,%s\r\n",
remote_port, local_port);
/* loop in case send is interrupted */
do
{
rc = send(sock_fd, ident_query, strlen(ident_query), 0);
} while (rc < 0 && errno == EINTR);
if (rc < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not send query to Ident server at address \"%s\", port %s: %m",
remote_addr_s, ident_port)));
ident_return = false;
goto ident_inet_done;
}
do
{
rc = recv(sock_fd, ident_response, sizeof(ident_response) - 1, 0);
} while (rc < 0 && errno == EINTR);
if (rc < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not receive response from Ident server at address \"%s\", port %s: %m",
remote_addr_s, ident_port)));
ident_return = false;
goto ident_inet_done;
}
ident_response[rc] = '\0';
ident_return = interpret_ident_response(ident_response, ident_user);
if (!ident_return)
ereport(LOG,
(errmsg("invalidly formatted response from Ident server: \"%s\"",
ident_response)));
ident_inet_done:
if (sock_fd >= 0)
closesocket(sock_fd);
pg_freeaddrinfo_all(remote_addr.addr.ss_family, ident_serv);
pg_freeaddrinfo_all(local_addr.addr.ss_family, la);
return ident_return;
}
/*
* Ask kernel about the credentials of the connecting process and
* determine the symbolic name of the corresponding user.
*
* Returns either true and the username put into "ident_user",
* or false if we were unable to determine the username.
*/
#ifdef HAVE_UNIX_SOCKETS
static bool
ident_unix(int sock, char *ident_user)
{
#if defined(HAVE_GETPEEREID)
/* OpenBSD style: */
uid_t uid;
gid_t gid;
struct passwd *pass;
errno = 0;
if (getpeereid(sock, &uid, &gid) != 0)
{
/* We didn't get a valid credentials struct. */
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not get peer credentials: %m")));
return false;
}
pass = getpwuid(uid);
if (pass == NULL)
{
ereport(LOG,
(errmsg("local user with ID %d does not exist",
(int) uid)));
return false;
}
strlcpy(ident_user, pass->pw_name, IDENT_USERNAME_MAX + 1);
return true;
#elif defined(SO_PEERCRED)
/* Linux style: use getsockopt(SO_PEERCRED) */
struct ucred peercred;
ACCEPT_TYPE_ARG3 so_len = sizeof(peercred);
struct passwd *pass;
errno = 0;
if (getsockopt(sock, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) != 0 ||
so_len != sizeof(peercred))
{
/* We didn't get a valid credentials struct. */
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not get peer credentials: %m")));
return false;
}
pass = getpwuid(peercred.uid);
if (pass == NULL)
{
ereport(LOG,
(errmsg("local user with ID %d does not exist",
(int) peercred.uid)));
return false;
}
strlcpy(ident_user, pass->pw_name, IDENT_USERNAME_MAX + 1);
return true;
#elif defined(HAVE_GETPEERUCRED)
/* Solaris > 10 */
uid_t uid;
struct passwd *pass;
ucred_t *ucred;
ucred = NULL; /* must be initialized to NULL */
if (getpeerucred(sock, &ucred) == -1)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not get peer credentials: %m")));
return false;
}
if ((uid = ucred_geteuid(ucred)) == -1)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not get effective UID from peer credentials: %m")));
return false;
}
ucred_free(ucred);
pass = getpwuid(uid);
if (pass == NULL)
{
ereport(LOG,
(errmsg("local user with ID %d does not exist",
(int) uid)));
return false;
}
strlcpy(ident_user, pass->pw_name, IDENT_USERNAME_MAX + 1);
return true;
#elif defined(HAVE_STRUCT_CMSGCRED) || defined(HAVE_STRUCT_FCRED) || (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
struct msghdr msg;
/* Credentials structure */
#if defined(HAVE_STRUCT_CMSGCRED)
typedef struct cmsgcred Cred;
#define cruid cmcred_uid
#elif defined(HAVE_STRUCT_FCRED)
typedef struct fcred Cred;
#define cruid fc_uid
#elif defined(HAVE_STRUCT_SOCKCRED)
typedef struct sockcred Cred;
#define cruid sc_uid
#endif
Cred *cred;
/* Compute size without padding */
char cmsgmem[ALIGN(sizeof(struct cmsghdr)) + ALIGN(sizeof(Cred))]; /* for NetBSD */
/* Point to start of first structure */
struct cmsghdr *cmsg = (struct cmsghdr *) cmsgmem;
struct iovec iov;
char buf;
struct passwd *pw;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (char *) cmsg;
msg.msg_controllen = sizeof(cmsgmem);
memset(cmsg, 0, sizeof(cmsgmem));
/*
* The one character which is received here is not meaningful; its
* purposes is only to make sure that recvmsg() blocks long enough for the
* other side to send its credentials.
*/
iov.iov_base = &buf;
iov.iov_len = 1;
if (recvmsg(sock, &msg, 0) < 0 ||
cmsg->cmsg_len < sizeof(cmsgmem) ||
cmsg->cmsg_type != SCM_CREDS)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("could not get peer credentials: %m")));
return false;
}
cred = (Cred *) CMSG_DATA(cmsg);
pw = getpwuid(cred->cruid);
if (pw == NULL)
{
ereport(LOG,
(errmsg("local user with ID %d does not exist",
(int) cred->cruid)));
return false;
}
strlcpy(ident_user, pw->pw_name, IDENT_USERNAME_MAX + 1);
return true;
#else
ereport(LOG,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("Ident authentication is not supported on local connections on this platform")));
return false;
#endif
}
#endif /* HAVE_UNIX_SOCKETS */
/*
* Determine the username of the initiator of the connection described
* by "port". Then look in the usermap file under the usermap
* port->hba->usermap and see if that user is equivalent to Postgres user
* port->user.
*
* Return STATUS_OK if yes, STATUS_ERROR if no match (or couldn't get info).
*/
static int
authident(hbaPort *port)
{
char ident_user[IDENT_USERNAME_MAX + 1];
switch (port->raddr.addr.ss_family)
{
case AF_INET:
#ifdef HAVE_IPV6
case AF_INET6:
#endif
if (!ident_inet(port->raddr, port->laddr, ident_user))
return STATUS_ERROR;
break;
#ifdef HAVE_UNIX_SOCKETS
case AF_UNIX:
if (!ident_unix(port->sock, ident_user))
return STATUS_ERROR;
break;
#endif
default:
return STATUS_ERROR;
}
return check_usermap(port->hba->usermap, port->user_name, ident_user, false);
}
/*----------------------------------------------------------------
* PAM authentication system
*----------------------------------------------------------------
*/
#ifdef USE_PAM
/*
* PAM conversation function
*/
static int
pam_passwd_conv_proc(int num_msg, const struct pam_message ** msg,
struct pam_response ** resp, void *appdata_ptr)
{
char *passwd;
struct pam_response *reply;
int i;
if (appdata_ptr)
passwd = (char *) appdata_ptr;
else
{
/*
* Workaround for Solaris 2.6 where the PAM library is broken and does
* not pass appdata_ptr to the conversation routine
*/
passwd = pam_passwd;
}
*resp = NULL; /* in case of error exit */
if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG)
return PAM_CONV_ERR;
/*
* Explicitly not using palloc here - PAM will free this memory in
* pam_end()
*/
if ((reply = calloc(num_msg, sizeof(struct pam_response))) == NULL)
{
ereport(LOG,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return PAM_CONV_ERR;
}
for (i = 0; i < num_msg; i++)
{
switch (msg[i]->msg_style)
{
case PAM_PROMPT_ECHO_OFF:
if (strlen(passwd) == 0)
{
/*
* Password wasn't passed to PAM the first time around -
* let's go ask the client to send a password, which we
* then stuff into PAM.
*/
sendAuthRequest(pam_port_cludge, AUTH_REQ_PASSWORD);
passwd = recv_password_packet(pam_port_cludge);
if (passwd == NULL)
{
/*
* Client didn't want to send password. We
* intentionally do not log anything about this.
*/
goto fail;
}
if (strlen(passwd) == 0)
{
ereport(LOG,
(errmsg("empty password returned by client")));
goto fail;
}
}
if ((reply[i].resp = strdup(passwd)) == NULL)
goto fail;
reply[i].resp_retcode = PAM_SUCCESS;
break;
case PAM_ERROR_MSG:
ereport(LOG,
(errmsg("error from underlying PAM layer: %s",
msg[i]->msg)));
/* FALL THROUGH */
case PAM_TEXT_INFO:
/* we don't bother to log TEXT_INFO messages */
if ((reply[i].resp = strdup("")) == NULL)
goto fail;
reply[i].resp_retcode = PAM_SUCCESS;
break;
default:
elog(LOG, "unsupported PAM conversation %d/\"%s\"",
msg[i]->msg_style,
msg[i]->msg ? msg[i]->msg : "(none)");
goto fail;
}
}
*resp = reply;
return PAM_SUCCESS;
fail:
/* free up whatever we allocated */
for (i = 0; i < num_msg; i++)
{
if (reply[i].resp != NULL)
free(reply[i].resp);
}
free(reply);
return PAM_CONV_ERR;
}
/*
* Check authentication against PAM.
*/
static int
CheckPAMAuth(Port *port, char *user, char *password)
{
int retval;
pam_handle_t *pamh = NULL;
/*
* We can't entirely rely on PAM to pass through appdata --- it appears
* not to work on at least Solaris 2.6. So use these ugly static
* variables instead.
*/
pam_passwd = password;
pam_port_cludge = port;
/*
* Set the application data portion of the conversation struct This is
* later used inside the PAM conversation to pass the password to the
* authentication module.
*/
pam_passw_conv.appdata_ptr = (char *) password; /* from password above,
* not allocated */
/* Optionally, one can set the service name in pg_hba.conf */
if (port->hba->pamservice && port->hba->pamservice[0] != '\0')
retval = pam_start(port->hba->pamservice, "pgsql@",
&pam_passw_conv, &pamh);
else
retval = pam_start(PGSQL_PAM_SERVICE, "pgsql@",
&pam_passw_conv, &pamh);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("could not create PAM authenticator: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL; /* Unset pam_passwd */
return STATUS_ERROR;
}
retval = pam_set_item(pamh, PAM_USER, user);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("pam_set_item(PAM_USER) failed: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL; /* Unset pam_passwd */
return STATUS_ERROR;
}
retval = pam_set_item(pamh, PAM_CONV, &pam_passw_conv);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("pam_set_item(PAM_CONV) failed: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL; /* Unset pam_passwd */
return STATUS_ERROR;
}
retval = pam_authenticate(pamh, 0);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("pam_authenticate failed: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL; /* Unset pam_passwd */
return STATUS_ERROR;
}
retval = pam_acct_mgmt(pamh, 0);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("pam_acct_mgmt failed: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL; /* Unset pam_passwd */
return STATUS_ERROR;
}
retval = pam_end(pamh, retval);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("could not release PAM authenticator: %s",
pam_strerror(pamh, retval))));
}
pam_passwd = NULL; /* Unset pam_passwd */
return (retval == PAM_SUCCESS ? STATUS_OK : STATUS_ERROR);
}
#endif /* USE_PAM */
/*----------------------------------------------------------------
* LDAP authentication system
*----------------------------------------------------------------
*/
#ifdef USE_LDAP
/*
* Initialize a connection to the LDAP server, including setting up
* TLS if requested.
*/
static int
InitializeLDAPConnection(Port *port, LDAP **ldap)
{
int ldapversion = LDAP_VERSION3;
int r;
*ldap = ldap_init(port->hba->ldapserver, port->hba->ldapport);
if (!*ldap)
{
#ifndef WIN32
ereport(LOG,
(errmsg("could not initialize LDAP: error code %d",
errno)));
#else
ereport(LOG,
(errmsg("could not initialize LDAP: error code %d",
(int) LdapGetLastError())));
#endif
return STATUS_ERROR;
}
if ((r = ldap_set_option(*ldap, LDAP_OPT_PROTOCOL_VERSION, &ldapversion)) != LDAP_SUCCESS)
{
ldap_unbind(*ldap);
ereport(LOG,
(errmsg("could not set LDAP protocol version: error code %d", r)));
return STATUS_ERROR;
}
if (port->hba->ldaptls)
{
#ifndef WIN32
if ((r = ldap_start_tls_s(*ldap, NULL, NULL)) != LDAP_SUCCESS)
#else
static __ldap_start_tls_sA _ldap_start_tls_sA = NULL;
if (_ldap_start_tls_sA == NULL)
{
/*
* Need to load this function dynamically because it does not
* exist on Windows 2000, and causes a load error for the whole
* exe if referenced.
*/
HANDLE ldaphandle;
ldaphandle = LoadLibrary("WLDAP32.DLL");
if (ldaphandle == NULL)
{
/*
* should never happen since we import other files from
* wldap32, but check anyway
*/
ldap_unbind(*ldap);
ereport(LOG,
(errmsg("could not load wldap32.dll")));
return STATUS_ERROR;
}
_ldap_start_tls_sA = (__ldap_start_tls_sA) GetProcAddress(ldaphandle, "ldap_start_tls_sA");
if (_ldap_start_tls_sA == NULL)
{
ldap_unbind(*ldap);
ereport(LOG,
(errmsg("could not load function _ldap_start_tls_sA in wldap32.dll"),
errdetail("LDAP over SSL is not supported on this platform.")));
return STATUS_ERROR;
}
/*
* Leak LDAP handle on purpose, because we need the library to
* stay open. This is ok because it will only ever be leaked once
* per process and is automatically cleaned up on process exit.
*/
}
if ((r = _ldap_start_tls_sA(*ldap, NULL, NULL, NULL, NULL)) != LDAP_SUCCESS)
#endif
{
ldap_unbind(*ldap);
ereport(LOG,
(errmsg("could not start LDAP TLS session: error code %d", r)));
return STATUS_ERROR;
}
}
return STATUS_OK;
}
/*
* Perform LDAP authentication
*/
static int
CheckLDAPAuth(Port *port)
{
char *passwd;
LDAP *ldap;
int r;
char *fulluser;
if (!port->hba->ldapserver || port->hba->ldapserver[0] == '\0')
{
ereport(LOG,
(errmsg("LDAP server not specified")));
return STATUS_ERROR;
}
if (port->hba->ldapport == 0)
port->hba->ldapport = LDAP_PORT;
sendAuthRequest(port, AUTH_REQ_PASSWORD);
passwd = recv_password_packet(port);
if (passwd == NULL)
return STATUS_EOF; /* client wouldn't send password */
if (strlen(passwd) == 0)
{
ereport(LOG,
(errmsg("empty password returned by client")));
return STATUS_ERROR;
}
if (InitializeLDAPConnection(port, &ldap) == STATUS_ERROR)
/* Error message already sent */
return STATUS_ERROR;
if (port->hba->ldapbasedn)
{
/*
* First perform an LDAP search to find the DN for the user we are trying to log
* in as.
*/
char *filter;
LDAPMessage *search_message;
LDAPMessage *entry;
char *attributes[2];
char *dn;
char *c;
/*
* Disallow any characters that we would otherwise need to escape, since they
* aren't really reasonable in a username anyway. Allowing them would make it
* possible to inject any kind of custom filters in the LDAP filter.
*/
for (c = port->user_name; *c; c++)
{
if (*c == '*' ||
*c == '(' ||
*c == ')' ||
*c == '\\' ||
*c == '/')
{
ereport(LOG,
(errmsg("invalid character in username for LDAP authentication")));
return STATUS_ERROR;
}
}
/*
* Bind with a pre-defined username/password (if available) for searching. If
* none is specified, this turns into an anonymous bind.
*/
r = ldap_simple_bind_s(ldap,
port->hba->ldapbinddn ? port->hba->ldapbinddn : "",
port->hba->ldapbindpasswd ? port->hba->ldapbindpasswd : "");
if (r != LDAP_SUCCESS)
{
ereport(LOG,
(errmsg("could not perform initial LDAP bind for ldapbinddn \"%s\" on server \"%s\": error code %d",
port->hba->ldapbinddn, port->hba->ldapserver, r)));
return STATUS_ERROR;
}
/* Fetch just one attribute, else *all* attributes are returned */
attributes[0] = port->hba->ldapsearchattribute ? port->hba->ldapsearchattribute : "uid";
attributes[1] = NULL;
filter = palloc(strlen(attributes[0])+strlen(port->user_name)+4);
sprintf(filter, "(%s=%s)",
attributes[0],
port->user_name);
r = ldap_search_s(ldap,
port->hba->ldapbasedn,
LDAP_SCOPE_SUBTREE,
filter,
attributes,
0,
&search_message);
if (r != LDAP_SUCCESS)
{
ereport(LOG,
(errmsg("could not search LDAP for filter \"%s\" on server \"%s\": error code %d",
filter, port->hba->ldapserver, r)));
pfree(filter);
return STATUS_ERROR;
}
if (ldap_count_entries(ldap, search_message) != 1)
{
if (ldap_count_entries(ldap, search_message) == 0)
ereport(LOG,
(errmsg("LDAP search failed for filter \"%s\" on server \"%s\": no such user",
filter, port->hba->ldapserver)));
else
ereport(LOG,
(errmsg("LDAP search failed for filter \"%s\" on server \"%s\": user is not unique (%ld matches)",
filter, port->hba->ldapserver,
(long) ldap_count_entries(ldap, search_message))));
pfree(filter);
ldap_msgfree(search_message);
return STATUS_ERROR;
}
entry = ldap_first_entry(ldap, search_message);
dn = ldap_get_dn(ldap, entry);
if (dn == NULL)
{
int error;
(void)ldap_get_option(ldap, LDAP_OPT_ERROR_NUMBER, &error);
ereport(LOG,
(errmsg("could not get dn for the first entry matching \"%s\" on server \"%s\": %s",
filter, port->hba->ldapserver, ldap_err2string(error))));
pfree(filter);
ldap_msgfree(search_message);
return STATUS_ERROR;
}
fulluser = pstrdup(dn);
pfree(filter);
ldap_memfree(dn);
ldap_msgfree(search_message);
/* Unbind and disconnect from the LDAP server */
r = ldap_unbind_s(ldap);
if (r != LDAP_SUCCESS)
{
int error;
(void)ldap_get_option(ldap, LDAP_OPT_ERROR_NUMBER, &error);
ereport(LOG,
(errmsg("could not unbind after searching for user \"%s\" on server \"%s\": %s",
fulluser, port->hba->ldapserver, ldap_err2string(error))));
pfree(fulluser);
return STATUS_ERROR;
}
/*
* Need to re-initialize the LDAP connection, so that we can bind
* to it with a different username.
*/
if (InitializeLDAPConnection(port, &ldap) == STATUS_ERROR)
{
pfree(fulluser);
/* Error message already sent */
return STATUS_ERROR;
}
}
else
{
fulluser = palloc((port->hba->ldapprefix ? strlen(port->hba->ldapprefix) : 0) +
strlen(port->user_name) +
(port->hba->ldapsuffix ? strlen(port->hba->ldapsuffix) : 0) +
1);
sprintf(fulluser, "%s%s%s",
port->hba->ldapprefix ? port->hba->ldapprefix : "",
port->user_name,
port->hba->ldapsuffix ? port->hba->ldapsuffix : "");
}
r = ldap_simple_bind_s(ldap, fulluser, passwd);
ldap_unbind(ldap);
if (r != LDAP_SUCCESS)
{
ereport(LOG,
(errmsg("LDAP login failed for user \"%s\" on server \"%s\": error code %d",
fulluser, port->hba->ldapserver, r)));
pfree(fulluser);
return STATUS_ERROR;
}
pfree(fulluser);
return STATUS_OK;
}
#endif /* USE_LDAP */
/*----------------------------------------------------------------
* SSL client certificate authentication
*----------------------------------------------------------------
*/
#ifdef USE_SSL
static int
CheckCertAuth(Port *port)
{
Assert(port->ssl);
/* Make sure we have received a username in the certificate */
if (port->peer_cn == NULL ||
strlen(port->peer_cn) <= 0)
{
ereport(LOG,
(errmsg("Certificate login failed for user \"%s\": client certificate contains no username",
port->user_name)));
return STATUS_ERROR;
}
/* Just pass the certificate CN to the usermap check */
return check_usermap(port->hba->usermap, port->user_name, port->peer_cn, false);
}
#endif
/*----------------------------------------------------------------
* RADIUS authentication
*----------------------------------------------------------------
*/
/*
* RADIUS authentication is described in RFC2865 (and several
* others).
*/
#define RADIUS_VECTOR_LENGTH 16
#define RADIUS_HEADER_LENGTH 20
typedef struct
{
uint8 attribute;
uint8 length;
uint8 data[1];
} radius_attribute;
typedef struct
{
uint8 code;
uint8 id;
uint16 length;
uint8 vector[RADIUS_VECTOR_LENGTH];
} radius_packet;
/* RADIUS packet types */
#define RADIUS_ACCESS_REQUEST 1
#define RADIUS_ACCESS_ACCEPT 2
#define RADIUS_ACCESS_REJECT 3
/* RAIDUS attributes */
#define RADIUS_USER_NAME 1
#define RADIUS_PASSWORD 2
#define RADIUS_SERVICE_TYPE 6
#define RADIUS_NAS_IDENTIFIER 32
/* RADIUS service types */
#define RADIUS_AUTHENTICATE_ONLY 8
/* Maximum size of a RADIUS packet we will create or accept */
#define RADIUS_BUFFER_SIZE 1024
/* Seconds to wait - XXX: should be in a config variable! */
#define RADIUS_TIMEOUT 3
static void
radius_add_attribute(radius_packet *packet, uint8 type, const unsigned char *data, int len)
{
radius_attribute *attr;
if (packet->length + len > RADIUS_BUFFER_SIZE)
{
/*
* With remotely realistic data, this can never happen. But catch it just to make
* sure we don't overrun a buffer. We'll just skip adding the broken attribute,
* which will in the end cause authentication to fail.
*/
elog(WARNING,
"Adding attribute code %i with length %i to radius packet would create oversize packet, ignoring",
type, len);
return;
}
attr = (radius_attribute *) ((unsigned char *)packet + packet->length);
attr->attribute = type;
attr->length = len + 2; /* total size includes type and length */
memcpy(attr->data, data, len);
packet->length += attr->length;
}
static int
CheckRADIUSAuth(Port *port)
{
char *passwd;
char *identifier = "postgresql";
char radius_buffer[RADIUS_BUFFER_SIZE];
char receive_buffer[RADIUS_BUFFER_SIZE];
radius_packet *packet = (radius_packet *)radius_buffer;
radius_packet *receivepacket = (radius_packet *)receive_buffer;
int32 service = htonl(RADIUS_AUTHENTICATE_ONLY);
uint8 *cryptvector;
uint8 encryptedpassword[RADIUS_VECTOR_LENGTH];
int packetlength;
pgsocket sock;
struct sockaddr_in localaddr;
struct sockaddr_in remoteaddr;
socklen_t addrsize;
fd_set fdset;
struct timeval timeout;
int i,r;
/* Make sure struct alignment is correct */
Assert(offsetof(radius_packet, vector) == 4);
/* Verify parameters */
if (!port->hba->radiusserver || port->hba->radiusserver[0] == '\0')
{
ereport(LOG,
(errmsg("RADIUS server not specified")));
return STATUS_ERROR;
}
if (!port->hba->radiussecret || port->hba->radiussecret[0] == '\0')
{
ereport(LOG,
(errmsg("RADIUS secret not specified")));
return STATUS_ERROR;
}
if (port->hba->radiusport == 0)
port->hba->radiusport = 1812;
memset(&remoteaddr, 0, sizeof(remoteaddr));
remoteaddr.sin_family = AF_INET;
remoteaddr.sin_addr.s_addr = inet_addr(port->hba->radiusserver);
if (remoteaddr.sin_addr.s_addr == INADDR_NONE)
{
ereport(LOG,
(errmsg("RADIUS server '%s' is not a valid IP address",
port->hba->radiusserver)));
return STATUS_ERROR;
}
remoteaddr.sin_port = htons(port->hba->radiusport);
if (port->hba->radiusidentifier && port->hba->radiusidentifier[0])
identifier = port->hba->radiusidentifier;
/* Send regular password request to client, and get the response */
sendAuthRequest(port, AUTH_REQ_PASSWORD);
passwd = recv_password_packet(port);
if (passwd == NULL)
return STATUS_EOF; /* client wouldn't send password */
if (strlen(passwd) == 0)
{
ereport(LOG,
(errmsg("empty password returned by client")));
return STATUS_ERROR;
}
if (strlen(passwd) > RADIUS_VECTOR_LENGTH)
{
ereport(LOG,
(errmsg("RADIUS authentication does not support passwords longer than 16 characters")));
return STATUS_ERROR;
}
/* Construct RADIUS packet */
packet->code = RADIUS_ACCESS_REQUEST;
packet->length = RADIUS_HEADER_LENGTH;
#ifdef USE_SSL
if (RAND_bytes(packet->vector, RADIUS_VECTOR_LENGTH) != 1)
{
ereport(LOG,
(errmsg("could not generate random encryption vector")));
return STATUS_ERROR;
}
#else
for (i = 0; i < RADIUS_VECTOR_LENGTH; i++)
/* Use a lower strengh random number of OpenSSL is not available */
packet->vector[i] = random() % 255;
#endif
packet->id = packet->vector[0];
radius_add_attribute(packet, RADIUS_SERVICE_TYPE, (unsigned char *) &service, sizeof(service));
radius_add_attribute(packet, RADIUS_USER_NAME, (unsigned char *) port->user_name, strlen(port->user_name));
radius_add_attribute(packet, RADIUS_NAS_IDENTIFIER, (unsigned char *) identifier, strlen(identifier));
/*
* RADIUS password attributes are calculated as:
* e[0] = p[0] XOR MD5(secret + vector)
*/
cryptvector = palloc(RADIUS_VECTOR_LENGTH + strlen(port->hba->radiussecret));
memcpy(cryptvector, port->hba->radiussecret, strlen(port->hba->radiussecret));
memcpy(cryptvector + strlen(port->hba->radiussecret), packet->vector, RADIUS_VECTOR_LENGTH);
if (!pg_md5_binary(cryptvector, RADIUS_VECTOR_LENGTH + strlen(port->hba->radiussecret), encryptedpassword))
{
ereport(LOG,
(errmsg("could not perform md5 encryption of password")));
pfree(cryptvector);
return STATUS_ERROR;
}
pfree(cryptvector);
for (i = 0; i < RADIUS_VECTOR_LENGTH; i++)
{
if (i < strlen(passwd))
encryptedpassword[i] = passwd[i] ^ encryptedpassword[i];
else
encryptedpassword[i] = '\0' ^ encryptedpassword[i];
}
radius_add_attribute(packet, RADIUS_PASSWORD, encryptedpassword, RADIUS_VECTOR_LENGTH);
/* Length need to be in network order on the wire */
packetlength = packet->length;
packet->length = htons(packet->length);
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
{
ereport(LOG,
(errmsg("could not create RADIUS socket: %m")));
return STATUS_ERROR;
}
memset(&localaddr, 0, sizeof(localaddr));
localaddr.sin_family = AF_INET;
localaddr.sin_addr.s_addr = INADDR_ANY;
if (bind(sock, (struct sockaddr *) &localaddr, sizeof(localaddr)))
{
ereport(LOG,
(errmsg("could not bind local RADIUS socket: %m")));
closesocket(sock);
return STATUS_ERROR;
}
if (sendto(sock, radius_buffer, packetlength, 0,
(struct sockaddr *) &remoteaddr, sizeof(remoteaddr)) < 0)
{
ereport(LOG,
(errmsg("could not send RADIUS packet: %m")));
closesocket(sock);
return STATUS_ERROR;
}
timeout.tv_sec = RADIUS_TIMEOUT;
timeout.tv_usec = 0;
FD_ZERO(&fdset);
FD_SET(sock, &fdset);
while (true)
{
r = select(sock + 1, &fdset, NULL, NULL, &timeout);
if (r < 0)
{
if (errno == EINTR)
continue;
/* Anything else is an actual error */
ereport(LOG,
(errmsg("could not check status on RADIUS socket: %m")));
closesocket(sock);
return STATUS_ERROR;
}
if (r == 0)
{
ereport(LOG,
(errmsg("timeout waiting for RADIUS response")));
closesocket(sock);
return STATUS_ERROR;
}
/* else we actually have a packet ready to read */
break;
}
/* Read the response packet */
addrsize = sizeof(remoteaddr);
packetlength = recvfrom(sock, receive_buffer, RADIUS_BUFFER_SIZE, 0,
(struct sockaddr *) &remoteaddr, &addrsize);
if (packetlength < 0)
{
ereport(LOG,
(errmsg("could not read RADIUS response: %m")));
closesocket(sock);
return STATUS_ERROR;
}
closesocket(sock);
if (remoteaddr.sin_port != htons(port->hba->radiusport))
{
ereport(LOG,
(errmsg("RADIUS response was sent from incorrect port: %i",
ntohs(remoteaddr.sin_port))));
return STATUS_ERROR;
}
if (packetlength < RADIUS_HEADER_LENGTH)
{
ereport(LOG,
(errmsg("RADIUS response too short: %i", packetlength)));
return STATUS_ERROR;
}
if (packetlength != ntohs(receivepacket->length))
{
ereport(LOG,
(errmsg("RADIUS response has corrupt length: %i (actual length %i)",
ntohs(receivepacket->length), packetlength)));
return STATUS_ERROR;
}
if (packet->id != receivepacket->id)
{
ereport(LOG,
(errmsg("RADIUS response is to a different request: %i (should be %i)",
receivepacket->id, packet->id)));
return STATUS_ERROR;
}
/*
* Verify the response authenticator, which is calculated as
* MD5(Code+ID+Length+RequestAuthenticator+Attributes+Secret)
*/
cryptvector = palloc(packetlength + strlen(port->hba->radiussecret));
memcpy(cryptvector, receivepacket, 4); /* code+id+length */
memcpy(cryptvector+4, packet->vector, RADIUS_VECTOR_LENGTH); /* request authenticator, from original packet */
if (packetlength > RADIUS_HEADER_LENGTH) /* there may be no attributes at all */
memcpy(cryptvector+RADIUS_HEADER_LENGTH, receive_buffer + RADIUS_HEADER_LENGTH, packetlength-RADIUS_HEADER_LENGTH);
memcpy(cryptvector+packetlength, port->hba->radiussecret, strlen(port->hba->radiussecret));
if (!pg_md5_binary(cryptvector,
packetlength + strlen(port->hba->radiussecret),
encryptedpassword))
{
ereport(LOG,
(errmsg("could not perform md5 encryption of received packet")));
pfree(cryptvector);
return STATUS_ERROR;
}
pfree(cryptvector);
if (memcmp(receivepacket->vector, encryptedpassword, RADIUS_VECTOR_LENGTH) != 0)
{
ereport(LOG,
(errmsg("RADIUS response has incorrect MD5 signature")));
return STATUS_ERROR;
}
if (receivepacket->code == RADIUS_ACCESS_ACCEPT)
return STATUS_OK;
else if (receivepacket->code == RADIUS_ACCESS_REJECT)
return STATUS_ERROR;
else
{
ereport(LOG,
(errmsg("RADIUS response has invalid code (%i) for user '%s'",
receivepacket->code, port->user_name)));
return STATUS_ERROR;
}
}
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