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https://git.postgresql.org/git/postgresql.git
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1037 lines
26 KiB
C
1037 lines
26 KiB
C
/*-------------------------------------------------------------------------
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*
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* fe-auth.c
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* The front-end (client) authorization routines
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*
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* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/interfaces/libpq/fe-auth.c,v 1.142 2009/06/11 14:49:13 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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/*
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* INTERFACE ROUTINES
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* frontend (client) routines:
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* pg_fe_sendauth send authentication information
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* pg_fe_getauthname get user's name according to the client side
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* of the authentication system
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*/
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#include "postgres_fe.h"
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#ifdef WIN32
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#include "win32.h"
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#else
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/param.h> /* for MAXHOSTNAMELEN on most */
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#include <sys/socket.h>
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#if defined(HAVE_STRUCT_CMSGCRED) || defined(HAVE_STRUCT_FCRED) || defined(HAVE_STRUCT_SOCKCRED)
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#include <sys/uio.h>
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#include <sys/ucred.h>
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#endif
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#ifndef MAXHOSTNAMELEN
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#include <netdb.h> /* for MAXHOSTNAMELEN on some */
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#endif
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#include <pwd.h>
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#endif
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#include "libpq-fe.h"
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#include "fe-auth.h"
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#include "libpq/md5.h"
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#ifdef KRB5
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/*
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* MIT Kerberos authentication system - protocol version 5
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*/
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#include <krb5.h>
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/* Some old versions of Kerberos do not include <com_err.h> in <krb5.h> */
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#if !defined(__COM_ERR_H) && !defined(__COM_ERR_H__)
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#include <com_err.h>
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#endif
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/*
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* Heimdal doesn't have a free function for unparsed names. Just pass it to
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* standard free() which should work in these cases.
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*/
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#ifndef HAVE_KRB5_FREE_UNPARSED_NAME
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static void
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krb5_free_unparsed_name(krb5_context context, char *val)
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{
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free(val);
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}
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#endif
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/*
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* pg_an_to_ln -- return the local name corresponding to an authentication
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* name
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*
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* XXX Assumes that the first aname component is the user name. This is NOT
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* necessarily so, since an aname can actually be something out of your
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* worst X.400 nightmare, like
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* ORGANIZATION=U. C. Berkeley/NAME=Paul M. Aoki@CS.BERKELEY.EDU
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* Note that the MIT an_to_ln code does the same thing if you don't
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* provide an aname mapping database...it may be a better idea to use
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* krb5_an_to_ln, except that it punts if multiple components are found,
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* and we can't afford to punt.
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*
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* For WIN32, convert username to lowercase because the Win32 kerberos library
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* generates tickets with the username as the user entered it instead of as
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* it is entered in the directory.
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*/
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static char *
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pg_an_to_ln(char *aname)
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{
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char *p;
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if ((p = strchr(aname, '/')) || (p = strchr(aname, '@')))
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*p = '\0';
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#ifdef WIN32
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for (p = aname; *p; p++)
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*p = pg_tolower((unsigned char) *p);
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#endif
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return aname;
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}
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/*
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* Various krb5 state which is not connection specific, and a flag to
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* indicate whether we have initialised it yet.
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*/
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/*
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static int pg_krb5_initialised;
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static krb5_context pg_krb5_context;
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static krb5_ccache pg_krb5_ccache;
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static krb5_principal pg_krb5_client;
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static char *pg_krb5_name;
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*/
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struct krb5_info
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{
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int pg_krb5_initialised;
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krb5_context pg_krb5_context;
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krb5_ccache pg_krb5_ccache;
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krb5_principal pg_krb5_client;
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char *pg_krb5_name;
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};
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static int
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pg_krb5_init(PQExpBuffer errorMessage, struct krb5_info * info)
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{
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krb5_error_code retval;
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if (info->pg_krb5_initialised)
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return STATUS_OK;
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retval = krb5_init_context(&(info->pg_krb5_context));
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if (retval)
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{
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printfPQExpBuffer(errorMessage,
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"pg_krb5_init: krb5_init_context: %s\n",
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error_message(retval));
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return STATUS_ERROR;
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}
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retval = krb5_cc_default(info->pg_krb5_context, &(info->pg_krb5_ccache));
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if (retval)
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{
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printfPQExpBuffer(errorMessage,
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"pg_krb5_init: krb5_cc_default: %s\n",
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error_message(retval));
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krb5_free_context(info->pg_krb5_context);
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return STATUS_ERROR;
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}
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retval = krb5_cc_get_principal(info->pg_krb5_context, info->pg_krb5_ccache,
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&(info->pg_krb5_client));
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if (retval)
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{
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printfPQExpBuffer(errorMessage,
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"pg_krb5_init: krb5_cc_get_principal: %s\n",
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error_message(retval));
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krb5_cc_close(info->pg_krb5_context, info->pg_krb5_ccache);
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krb5_free_context(info->pg_krb5_context);
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return STATUS_ERROR;
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}
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retval = krb5_unparse_name(info->pg_krb5_context, info->pg_krb5_client, &(info->pg_krb5_name));
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if (retval)
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{
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printfPQExpBuffer(errorMessage,
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"pg_krb5_init: krb5_unparse_name: %s\n",
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error_message(retval));
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krb5_free_principal(info->pg_krb5_context, info->pg_krb5_client);
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krb5_cc_close(info->pg_krb5_context, info->pg_krb5_ccache);
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krb5_free_context(info->pg_krb5_context);
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return STATUS_ERROR;
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}
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info->pg_krb5_name = pg_an_to_ln(info->pg_krb5_name);
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info->pg_krb5_initialised = 1;
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return STATUS_OK;
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}
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static void
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pg_krb5_destroy(struct krb5_info * info)
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{
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krb5_free_principal(info->pg_krb5_context, info->pg_krb5_client);
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krb5_cc_close(info->pg_krb5_context, info->pg_krb5_ccache);
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krb5_free_unparsed_name(info->pg_krb5_context, info->pg_krb5_name);
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krb5_free_context(info->pg_krb5_context);
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}
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/*
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* pg_krb5_sendauth -- client routine to send authentication information to
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* the server
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*/
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static int
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pg_krb5_sendauth(PGconn *conn)
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{
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krb5_error_code retval;
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int ret;
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krb5_principal server;
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krb5_auth_context auth_context = NULL;
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krb5_error *err_ret = NULL;
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struct krb5_info info;
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info.pg_krb5_initialised = 0;
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if (!conn->pghost)
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{
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printfPQExpBuffer(&conn->errorMessage,
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"pg_krb5_sendauth: hostname must be specified for Kerberos authentication\n");
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return STATUS_ERROR;
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}
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ret = pg_krb5_init(&conn->errorMessage, &info);
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if (ret != STATUS_OK)
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return ret;
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retval = krb5_sname_to_principal(info.pg_krb5_context, conn->pghost,
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conn->krbsrvname,
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KRB5_NT_SRV_HST, &server);
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if (retval)
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{
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printfPQExpBuffer(&conn->errorMessage,
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"pg_krb5_sendauth: krb5_sname_to_principal: %s\n",
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error_message(retval));
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pg_krb5_destroy(&info);
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return STATUS_ERROR;
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}
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/*
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* libpq uses a non-blocking socket. But kerberos needs a blocking socket,
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* and we have to block somehow to do mutual authentication anyway. So we
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* temporarily make it blocking.
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*/
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if (!pg_set_block(conn->sock))
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{
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char sebuf[256];
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("could not set socket to blocking mode: %s\n"), pqStrerror(errno, sebuf, sizeof(sebuf)));
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krb5_free_principal(info.pg_krb5_context, server);
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pg_krb5_destroy(&info);
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return STATUS_ERROR;
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}
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retval = krb5_sendauth(info.pg_krb5_context, &auth_context,
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(krb5_pointer) & conn->sock, (char *) conn->krbsrvname,
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info.pg_krb5_client, server,
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AP_OPTS_MUTUAL_REQUIRED,
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NULL, 0, /* no creds, use ccache instead */
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info.pg_krb5_ccache, &err_ret, NULL, NULL);
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if (retval)
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{
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if (retval == KRB5_SENDAUTH_REJECTED && err_ret)
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{
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#if defined(HAVE_KRB5_ERROR_TEXT_DATA)
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("Kerberos 5 authentication rejected: %*s\n"),
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(int) err_ret->text.length, err_ret->text.data);
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#elif defined(HAVE_KRB5_ERROR_E_DATA)
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("Kerberos 5 authentication rejected: %*s\n"),
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(int) err_ret->e_data->length,
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(const char *) err_ret->e_data->data);
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#else
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#error "bogus configuration"
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#endif
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}
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else
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{
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printfPQExpBuffer(&conn->errorMessage,
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"krb5_sendauth: %s\n", error_message(retval));
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}
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if (err_ret)
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krb5_free_error(info.pg_krb5_context, err_ret);
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ret = STATUS_ERROR;
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}
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krb5_free_principal(info.pg_krb5_context, server);
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if (!pg_set_noblock(conn->sock))
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{
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char sebuf[256];
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("could not restore non-blocking mode on socket: %s\n"),
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pqStrerror(errno, sebuf, sizeof(sebuf)));
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ret = STATUS_ERROR;
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}
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pg_krb5_destroy(&info);
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return ret;
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}
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#endif /* KRB5 */
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#ifdef ENABLE_GSS
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/*
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* GSSAPI authentication system.
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*/
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#if defined(WIN32) && !defined(WIN32_ONLY_COMPILER)
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/*
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* MIT Kerberos GSSAPI DLL doesn't properly export the symbols for MingW
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* that contain the OIDs required. Redefine here, values copied
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* from src/athena/auth/krb5/src/lib/gssapi/generic/gssapi_generic.c
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*/
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static const gss_OID_desc GSS_C_NT_HOSTBASED_SERVICE_desc =
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{10, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04"};
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static GSS_DLLIMP gss_OID GSS_C_NT_HOSTBASED_SERVICE = &GSS_C_NT_HOSTBASED_SERVICE_desc;
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#endif
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/*
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* Fetch all errors of a specific type and append to "str".
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*/
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static void
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pg_GSS_error_int(PQExpBuffer str, const char *mprefix,
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OM_uint32 stat, int type)
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{
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OM_uint32 lmaj_s,
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lmin_s;
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gss_buffer_desc lmsg;
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OM_uint32 msg_ctx = 0;
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do
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{
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lmaj_s = gss_display_status(&lmin_s, stat, type,
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GSS_C_NO_OID, &msg_ctx, &lmsg);
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appendPQExpBuffer(str, "%s: %s\n", mprefix, (char *) lmsg.value);
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gss_release_buffer(&lmin_s, &lmsg);
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} while (msg_ctx);
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}
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/*
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* GSSAPI errors contain two parts; put both into conn->errorMessage.
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*/
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static void
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pg_GSS_error(const char *mprefix, PGconn *conn,
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OM_uint32 maj_stat, OM_uint32 min_stat)
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{
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resetPQExpBuffer(&conn->errorMessage);
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/* Fetch major error codes */
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pg_GSS_error_int(&conn->errorMessage, mprefix, maj_stat, GSS_C_GSS_CODE);
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/* Add the minor codes as well */
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pg_GSS_error_int(&conn->errorMessage, mprefix, min_stat, GSS_C_MECH_CODE);
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}
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/*
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* Continue GSS authentication with next token as needed.
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*/
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static int
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pg_GSS_continue(PGconn *conn)
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{
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OM_uint32 maj_stat,
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min_stat,
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lmin_s;
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maj_stat = gss_init_sec_context(&min_stat,
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GSS_C_NO_CREDENTIAL,
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&conn->gctx,
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conn->gtarg_nam,
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GSS_C_NO_OID,
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GSS_C_MUTUAL_FLAG,
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0,
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GSS_C_NO_CHANNEL_BINDINGS,
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(conn->gctx == GSS_C_NO_CONTEXT) ? GSS_C_NO_BUFFER : &conn->ginbuf,
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NULL,
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&conn->goutbuf,
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NULL,
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NULL);
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if (conn->gctx != GSS_C_NO_CONTEXT)
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{
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free(conn->ginbuf.value);
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conn->ginbuf.value = NULL;
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conn->ginbuf.length = 0;
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}
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if (conn->goutbuf.length != 0)
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{
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/*
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* GSS generated data to send to the server. We don't care if it's the
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* first or subsequent packet, just send the same kind of password
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* packet.
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*/
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if (pqPacketSend(conn, 'p',
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conn->goutbuf.value, conn->goutbuf.length)
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!= STATUS_OK)
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{
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gss_release_buffer(&lmin_s, &conn->goutbuf);
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return STATUS_ERROR;
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}
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}
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gss_release_buffer(&lmin_s, &conn->goutbuf);
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|
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if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED)
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{
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pg_GSS_error(libpq_gettext("GSSAPI continuation error"),
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conn,
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maj_stat, min_stat);
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gss_release_name(&lmin_s, &conn->gtarg_nam);
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if (conn->gctx)
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gss_delete_sec_context(&lmin_s, &conn->gctx, GSS_C_NO_BUFFER);
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return STATUS_ERROR;
|
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}
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|
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if (maj_stat == GSS_S_COMPLETE)
|
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gss_release_name(&lmin_s, &conn->gtarg_nam);
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|
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return STATUS_OK;
|
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}
|
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|
|
/*
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* Send initial GSS authentication token
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*/
|
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static int
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pg_GSS_startup(PGconn *conn)
|
|
{
|
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OM_uint32 maj_stat,
|
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min_stat;
|
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int maxlen;
|
|
gss_buffer_desc temp_gbuf;
|
|
|
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if (conn->gctx)
|
|
{
|
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printfPQExpBuffer(&conn->errorMessage,
|
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libpq_gettext("duplicate GSS authentication request\n"));
|
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return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Import service principal name so the proper ticket can be acquired by
|
|
* the GSSAPI system.
|
|
*/
|
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maxlen = NI_MAXHOST + strlen(conn->krbsrvname) + 2;
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temp_gbuf.value = (char *) malloc(maxlen);
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snprintf(temp_gbuf.value, maxlen, "%s@%s",
|
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conn->krbsrvname, conn->pghost);
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temp_gbuf.length = strlen(temp_gbuf.value);
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|
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maj_stat = gss_import_name(&min_stat, &temp_gbuf,
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GSS_C_NT_HOSTBASED_SERVICE, &conn->gtarg_nam);
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free(temp_gbuf.value);
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|
|
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if (maj_stat != GSS_S_COMPLETE)
|
|
{
|
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pg_GSS_error(libpq_gettext("GSSAPI name import error"),
|
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conn,
|
|
maj_stat, min_stat);
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Initial packet is the same as a continuation packet with no initial
|
|
* context.
|
|
*/
|
|
conn->gctx = GSS_C_NO_CONTEXT;
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|
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return pg_GSS_continue(conn);
|
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}
|
|
#endif /* ENABLE_GSS */
|
|
|
|
|
|
#ifdef ENABLE_SSPI
|
|
/*
|
|
* SSPI authentication system (Windows only)
|
|
*/
|
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|
|
static void
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pg_SSPI_error(PGconn *conn, const char *mprefix, SECURITY_STATUS r)
|
|
{
|
|
char sysmsg[256];
|
|
|
|
if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, r, 0,
|
|
sysmsg, sizeof(sysmsg), NULL) == 0)
|
|
printfPQExpBuffer(&conn->errorMessage, "%s: SSPI error %x",
|
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mprefix, (unsigned int) r);
|
|
else
|
|
printfPQExpBuffer(&conn->errorMessage, "%s: %s (%x)",
|
|
mprefix, sysmsg, (unsigned int) r);
|
|
}
|
|
|
|
/*
|
|
* Continue SSPI authentication with next token as needed.
|
|
*/
|
|
static int
|
|
pg_SSPI_continue(PGconn *conn)
|
|
{
|
|
SECURITY_STATUS r;
|
|
CtxtHandle newContext;
|
|
ULONG contextAttr;
|
|
SecBufferDesc inbuf;
|
|
SecBufferDesc outbuf;
|
|
SecBuffer OutBuffers[1];
|
|
SecBuffer InBuffers[1];
|
|
|
|
if (conn->sspictx != NULL)
|
|
{
|
|
/*
|
|
* On runs other than the first we have some data to send. Put this
|
|
* data in a SecBuffer type structure.
|
|
*/
|
|
inbuf.ulVersion = SECBUFFER_VERSION;
|
|
inbuf.cBuffers = 1;
|
|
inbuf.pBuffers = InBuffers;
|
|
InBuffers[0].pvBuffer = conn->ginbuf.value;
|
|
InBuffers[0].cbBuffer = conn->ginbuf.length;
|
|
InBuffers[0].BufferType = SECBUFFER_TOKEN;
|
|
}
|
|
|
|
OutBuffers[0].pvBuffer = NULL;
|
|
OutBuffers[0].BufferType = SECBUFFER_TOKEN;
|
|
OutBuffers[0].cbBuffer = 0;
|
|
outbuf.cBuffers = 1;
|
|
outbuf.pBuffers = OutBuffers;
|
|
outbuf.ulVersion = SECBUFFER_VERSION;
|
|
|
|
r = InitializeSecurityContext(conn->sspicred,
|
|
conn->sspictx,
|
|
conn->sspitarget,
|
|
ISC_REQ_ALLOCATE_MEMORY,
|
|
0,
|
|
SECURITY_NETWORK_DREP,
|
|
(conn->sspictx == NULL) ? NULL : &inbuf,
|
|
0,
|
|
&newContext,
|
|
&outbuf,
|
|
&contextAttr,
|
|
NULL);
|
|
|
|
if (r != SEC_E_OK && r != SEC_I_CONTINUE_NEEDED)
|
|
{
|
|
pg_SSPI_error(conn, libpq_gettext("SSPI continuation error"), r);
|
|
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
if (conn->sspictx == NULL)
|
|
{
|
|
/* On first run, transfer retreived context handle */
|
|
conn->sspictx = malloc(sizeof(CtxtHandle));
|
|
if (conn->sspictx == NULL)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage, libpq_gettext("out of memory\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
memcpy(conn->sspictx, &newContext, sizeof(CtxtHandle));
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* On subsequent runs when we had data to send, free buffers that
|
|
* contained this data.
|
|
*/
|
|
free(conn->ginbuf.value);
|
|
conn->ginbuf.value = NULL;
|
|
conn->ginbuf.length = 0;
|
|
}
|
|
|
|
/*
|
|
* If SSPI returned any data to be sent to the server (as it normally
|
|
* would), send this data as a password packet.
|
|
*/
|
|
if (outbuf.cBuffers > 0)
|
|
{
|
|
if (outbuf.cBuffers != 1)
|
|
{
|
|
/*
|
|
* This should never happen, at least not for Kerberos
|
|
* authentication. Keep check in case it shows up with other
|
|
* authentication methods later.
|
|
*/
|
|
printfPQExpBuffer(&conn->errorMessage, "SSPI returned invalid number of output buffers\n");
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* If the negotiation is complete, there may be zero bytes to send.
|
|
* The server is at this point not expecting any more data, so don't
|
|
* send it.
|
|
*/
|
|
if (outbuf.pBuffers[0].cbBuffer > 0)
|
|
{
|
|
if (pqPacketSend(conn, 'p',
|
|
outbuf.pBuffers[0].pvBuffer, outbuf.pBuffers[0].cbBuffer))
|
|
{
|
|
FreeContextBuffer(outbuf.pBuffers[0].pvBuffer);
|
|
return STATUS_ERROR;
|
|
}
|
|
}
|
|
FreeContextBuffer(outbuf.pBuffers[0].pvBuffer);
|
|
}
|
|
|
|
/* Cleanup is handled by the code in freePGconn() */
|
|
return STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
* Send initial SSPI authentication token.
|
|
* If use_negotiate is 0, use kerberos authentication package which is
|
|
* compatible with Unix. If use_negotiate is 1, use the negotiate package
|
|
* which supports both kerberos and NTLM, but is not compatible with Unix.
|
|
*/
|
|
static int
|
|
pg_SSPI_startup(PGconn *conn, int use_negotiate)
|
|
{
|
|
SECURITY_STATUS r;
|
|
TimeStamp expire;
|
|
|
|
conn->sspictx = NULL;
|
|
|
|
/*
|
|
* Retreive credentials handle
|
|
*/
|
|
conn->sspicred = malloc(sizeof(CredHandle));
|
|
if (conn->sspicred == NULL)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage, libpq_gettext("out of memory\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
r = AcquireCredentialsHandle(NULL,
|
|
use_negotiate ? "negotiate" : "kerberos",
|
|
SECPKG_CRED_OUTBOUND,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
conn->sspicred,
|
|
&expire);
|
|
if (r != SEC_E_OK)
|
|
{
|
|
pg_SSPI_error(conn, libpq_gettext("could not acquire SSPI credentials"), r);
|
|
free(conn->sspicred);
|
|
conn->sspicred = NULL;
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Compute target principal name. SSPI has a different format from GSSAPI,
|
|
* but not more complex. We can skip the @REALM part, because Windows will
|
|
* fill that in for us automatically.
|
|
*/
|
|
if (conn->pghost == NULL)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage, libpq_gettext("host name must be specified\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
conn->sspitarget = malloc(strlen(conn->krbsrvname) + strlen(conn->pghost) + 2);
|
|
if (!conn->sspitarget)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage, libpq_gettext("out of memory\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
sprintf(conn->sspitarget, "%s/%s", conn->krbsrvname, conn->pghost);
|
|
|
|
/*
|
|
* Indicate that we're in SSPI authentication mode to make sure that
|
|
* pg_SSPI_continue is called next time in the negotiation.
|
|
*/
|
|
conn->usesspi = 1;
|
|
|
|
return pg_SSPI_continue(conn);
|
|
}
|
|
#endif /* ENABLE_SSPI */
|
|
|
|
/*
|
|
* Respond to AUTH_REQ_SCM_CREDS challenge.
|
|
*
|
|
* Note: current backends will not use this challenge if HAVE_GETPEEREID
|
|
* or SO_PEERCRED is defined, but pre-7.4 backends might, so compile the
|
|
* code anyway.
|
|
*/
|
|
static int
|
|
pg_local_sendauth(PGconn *conn)
|
|
{
|
|
#if defined(HAVE_STRUCT_CMSGCRED) || defined(HAVE_STRUCT_FCRED) || \
|
|
(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
|
|
char buf;
|
|
struct iovec iov;
|
|
struct msghdr msg;
|
|
|
|
#ifdef HAVE_STRUCT_CMSGCRED
|
|
/* Prevent padding */
|
|
char cmsgmem[sizeof(struct cmsghdr) + sizeof(struct cmsgcred)];
|
|
|
|
/* Point to start of first structure */
|
|
struct cmsghdr *cmsg = (struct cmsghdr *) cmsgmem;
|
|
#endif
|
|
|
|
/*
|
|
* The backend doesn't care what we send here, but it wants exactly one
|
|
* character to force recvmsg() to block and wait for us.
|
|
*/
|
|
buf = '\0';
|
|
iov.iov_base = &buf;
|
|
iov.iov_len = 1;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
#ifdef HAVE_STRUCT_CMSGCRED
|
|
/* Create control header, FreeBSD */
|
|
msg.msg_control = cmsg;
|
|
msg.msg_controllen = sizeof(cmsgmem);
|
|
memset(cmsg, 0, sizeof(cmsgmem));
|
|
cmsg->cmsg_len = sizeof(cmsgmem);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_CREDS;
|
|
#endif
|
|
|
|
if (sendmsg(conn->sock, &msg, 0) == -1)
|
|
{
|
|
char sebuf[256];
|
|
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
"pg_local_sendauth: sendmsg: %s\n",
|
|
pqStrerror(errno, sebuf, sizeof(sebuf)));
|
|
return STATUS_ERROR;
|
|
}
|
|
return STATUS_OK;
|
|
#else
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("SCM_CRED authentication method not supported\n"));
|
|
return STATUS_ERROR;
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
pg_password_sendauth(PGconn *conn, const char *password, AuthRequest areq)
|
|
{
|
|
int ret;
|
|
char *crypt_pwd;
|
|
|
|
/* Encrypt the password if needed. */
|
|
|
|
switch (areq)
|
|
{
|
|
case AUTH_REQ_MD5:
|
|
{
|
|
char *crypt_pwd2;
|
|
|
|
/* Allocate enough space for two MD5 hashes */
|
|
crypt_pwd = malloc(2 * (MD5_PASSWD_LEN + 1));
|
|
if (!crypt_pwd)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("out of memory\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
crypt_pwd2 = crypt_pwd + MD5_PASSWD_LEN + 1;
|
|
if (!pg_md5_encrypt(password, conn->pguser,
|
|
strlen(conn->pguser), crypt_pwd2))
|
|
{
|
|
free(crypt_pwd);
|
|
return STATUS_ERROR;
|
|
}
|
|
if (!pg_md5_encrypt(crypt_pwd2 + strlen("md5"), conn->md5Salt,
|
|
sizeof(conn->md5Salt), crypt_pwd))
|
|
{
|
|
free(crypt_pwd);
|
|
return STATUS_ERROR;
|
|
}
|
|
break;
|
|
}
|
|
case AUTH_REQ_PASSWORD:
|
|
/* discard const so we can assign it */
|
|
crypt_pwd = (char *) password;
|
|
break;
|
|
default:
|
|
return STATUS_ERROR;
|
|
}
|
|
/* Packet has a message type as of protocol 3.0 */
|
|
if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
|
|
ret = pqPacketSend(conn, 'p', crypt_pwd, strlen(crypt_pwd) + 1);
|
|
else
|
|
ret = pqPacketSend(conn, 0, crypt_pwd, strlen(crypt_pwd) + 1);
|
|
if (areq == AUTH_REQ_MD5)
|
|
free(crypt_pwd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* pg_fe_sendauth
|
|
* client demux routine for outgoing authentication information
|
|
*/
|
|
int
|
|
pg_fe_sendauth(AuthRequest areq, PGconn *conn)
|
|
{
|
|
switch (areq)
|
|
{
|
|
case AUTH_REQ_OK:
|
|
break;
|
|
|
|
case AUTH_REQ_KRB4:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("Kerberos 4 authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
|
|
case AUTH_REQ_KRB5:
|
|
#ifdef KRB5
|
|
pglock_thread();
|
|
if (pg_krb5_sendauth(conn) != STATUS_OK)
|
|
{
|
|
/* Error message already filled in */
|
|
pgunlock_thread();
|
|
return STATUS_ERROR;
|
|
}
|
|
pgunlock_thread();
|
|
break;
|
|
#else
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("Kerberos 5 authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
#endif
|
|
|
|
#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
|
|
case AUTH_REQ_GSS:
|
|
{
|
|
int r;
|
|
|
|
pglock_thread();
|
|
|
|
/*
|
|
* If we have both GSS and SSPI support compiled in, use SSPI
|
|
* support by default. This is overridable by a connection
|
|
* string parameter. Note that when using SSPI we still leave
|
|
* the negotiate parameter off, since we want SSPI to use the
|
|
* GSSAPI kerberos protocol. For actual SSPI negotiate
|
|
* protocol, we use AUTH_REQ_SSPI.
|
|
*/
|
|
#if defined(ENABLE_GSS) && defined(ENABLE_SSPI)
|
|
if (conn->gsslib && (pg_strcasecmp(conn->gsslib, "gssapi") == 0))
|
|
r = pg_GSS_startup(conn);
|
|
else
|
|
r = pg_SSPI_startup(conn, 0);
|
|
#elif defined(ENABLE_GSS) && !defined(ENABLE_SSPI)
|
|
r = pg_GSS_startup(conn);
|
|
#elif !defined(ENABLE_GSS) && defined(ENABLE_SSPI)
|
|
r = pg_SSPI_startup(conn, 0);
|
|
#endif
|
|
if (r != STATUS_OK)
|
|
{
|
|
/* Error message already filled in. */
|
|
pgunlock_thread();
|
|
return STATUS_ERROR;
|
|
}
|
|
pgunlock_thread();
|
|
}
|
|
break;
|
|
|
|
case AUTH_REQ_GSS_CONT:
|
|
{
|
|
int r;
|
|
|
|
pglock_thread();
|
|
#if defined(ENABLE_GSS) && defined(ENABLE_SSPI)
|
|
if (conn->usesspi)
|
|
r = pg_SSPI_continue(conn);
|
|
else
|
|
r = pg_GSS_continue(conn);
|
|
#elif defined(ENABLE_GSS) && !defined(ENABLE_SSPI)
|
|
r = pg_GSS_continue(conn);
|
|
#elif !defined(ENABLE_GSS) && defined(ENABLE_SSPI)
|
|
r = pg_SSPI_continue(conn);
|
|
#endif
|
|
if (r != STATUS_OK)
|
|
{
|
|
/* Error message already filled in. */
|
|
pgunlock_thread();
|
|
return STATUS_ERROR;
|
|
}
|
|
pgunlock_thread();
|
|
}
|
|
break;
|
|
#else
|
|
case AUTH_REQ_GSS:
|
|
case AUTH_REQ_GSS_CONT:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("GSSAPI authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
#endif
|
|
|
|
#ifdef ENABLE_SSPI
|
|
case AUTH_REQ_SSPI:
|
|
|
|
/*
|
|
* SSPI has it's own startup message so libpq can decide which
|
|
* method to use. Indicate to pg_SSPI_startup that we want SSPI
|
|
* negotiation instead of Kerberos.
|
|
*/
|
|
pglock_thread();
|
|
if (pg_SSPI_startup(conn, 1) != STATUS_OK)
|
|
{
|
|
/* Error message already filled in. */
|
|
pgunlock_thread();
|
|
return STATUS_ERROR;
|
|
}
|
|
pgunlock_thread();
|
|
break;
|
|
#else
|
|
case AUTH_REQ_SSPI:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("SSPI authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
#endif
|
|
|
|
|
|
case AUTH_REQ_CRYPT:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("Crypt authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
|
|
case AUTH_REQ_MD5:
|
|
case AUTH_REQ_PASSWORD:
|
|
conn->password_needed = true;
|
|
if (conn->pgpass == NULL || conn->pgpass[0] == '\0')
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
PQnoPasswordSupplied);
|
|
return STATUS_ERROR;
|
|
}
|
|
if (pg_password_sendauth(conn, conn->pgpass, areq) != STATUS_OK)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
"fe_sendauth: error sending password authentication\n");
|
|
return STATUS_ERROR;
|
|
}
|
|
break;
|
|
|
|
case AUTH_REQ_SCM_CREDS:
|
|
if (pg_local_sendauth(conn) != STATUS_OK)
|
|
return STATUS_ERROR;
|
|
break;
|
|
|
|
default:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("authentication method %u not supported\n"), areq);
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
return STATUS_OK;
|
|
}
|
|
|
|
|
|
/*
|
|
* pg_fe_getauthname -- returns a pointer to dynamic space containing whatever
|
|
* name the user has authenticated to the system
|
|
*
|
|
* if there is an error, return NULL with an error message in errorMessage
|
|
*/
|
|
char *
|
|
pg_fe_getauthname(PQExpBuffer errorMessage)
|
|
{
|
|
const char *name = NULL;
|
|
char *authn;
|
|
|
|
#ifdef WIN32
|
|
char username[128];
|
|
DWORD namesize = sizeof(username) - 1;
|
|
#else
|
|
char pwdbuf[BUFSIZ];
|
|
struct passwd pwdstr;
|
|
struct passwd *pw = NULL;
|
|
#endif
|
|
|
|
/*
|
|
* Some users are using configure --enable-thread-safety-force, so we
|
|
* might as well do the locking within our library to protect
|
|
* pqGetpwuid(). In fact, application developers can use getpwuid() in
|
|
* their application if they use the locking call we provide, or install
|
|
* their own locking function using PQregisterThreadLock().
|
|
*/
|
|
pglock_thread();
|
|
|
|
if (!name)
|
|
{
|
|
#ifdef WIN32
|
|
if (GetUserName(username, &namesize))
|
|
name = username;
|
|
#else
|
|
if (pqGetpwuid(geteuid(), &pwdstr, pwdbuf, sizeof(pwdbuf), &pw) == 0)
|
|
name = pw->pw_name;
|
|
#endif
|
|
}
|
|
|
|
authn = name ? strdup(name) : NULL;
|
|
|
|
pgunlock_thread();
|
|
|
|
return authn;
|
|
}
|
|
|
|
|
|
/*
|
|
* PQencryptPassword -- exported routine to encrypt a password
|
|
*
|
|
* This is intended to be used by client applications that wish to send
|
|
* commands like ALTER USER joe PASSWORD 'pwd'. The password need not
|
|
* be sent in cleartext if it is encrypted on the client side. This is
|
|
* good because it ensures the cleartext password won't end up in logs,
|
|
* pg_stat displays, etc. We export the function so that clients won't
|
|
* be dependent on low-level details like whether the enceyption is MD5
|
|
* or something else.
|
|
*
|
|
* Arguments are the cleartext password, and the SQL name of the user it
|
|
* is for.
|
|
*
|
|
* Return value is a malloc'd string, or NULL if out-of-memory. The client
|
|
* may assume the string doesn't contain any special characters that would
|
|
* require escaping.
|
|
*/
|
|
char *
|
|
PQencryptPassword(const char *passwd, const char *user)
|
|
{
|
|
char *crypt_pwd;
|
|
|
|
crypt_pwd = malloc(MD5_PASSWD_LEN + 1);
|
|
if (!crypt_pwd)
|
|
return NULL;
|
|
|
|
if (!pg_md5_encrypt(passwd, user, strlen(user), crypt_pwd))
|
|
{
|
|
free(crypt_pwd);
|
|
return NULL;
|
|
}
|
|
|
|
return crypt_pwd;
|
|
}
|