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https://git.postgresql.org/git/postgresql.git
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1232 lines
31 KiB
C
1232 lines
31 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) 1996-2017, 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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* src/interfaces/libpq/fe-auth.c
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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/param.h> /* for MAXHOSTNAMELEN on most */
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#include <sys/socket.h>
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#ifdef HAVE_SYS_UCRED_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 "common/md5.h"
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#include "libpq-fe.h"
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#include "libpq/scram.h"
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#include "fe-auth.h"
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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(_MSC_VER)
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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 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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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, int payloadlen)
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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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gss_buffer_desc ginbuf;
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gss_buffer_desc goutbuf;
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/*
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* On first call, there's no input token. On subsequent calls, read the
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* input token into a GSS buffer.
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*/
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if (conn->gctx != GSS_C_NO_CONTEXT)
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{
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ginbuf.length = payloadlen;
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ginbuf.value = malloc(payloadlen);
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if (!ginbuf.value)
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{
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("out of memory allocating GSSAPI buffer (%d)\n"),
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payloadlen);
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return STATUS_ERROR;
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}
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if (pqGetnchar(ginbuf.value, payloadlen, conn))
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{
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/*
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* Shouldn't happen, because the caller should've ensured that the
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* whole message is already in the input buffer.
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*/
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free(ginbuf.value);
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return STATUS_ERROR;
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}
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}
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else
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{
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ginbuf.length = 0;
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ginbuf.value = NULL;
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}
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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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(ginbuf.value == NULL) ? GSS_C_NO_BUFFER : &ginbuf,
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NULL,
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&goutbuf,
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NULL,
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NULL);
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if (ginbuf.value)
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free(ginbuf.value);
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if (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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goutbuf.value, goutbuf.length) != STATUS_OK)
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{
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gss_release_buffer(&lmin_s, &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, &goutbuf);
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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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if (maj_stat == GSS_S_COMPLETE)
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gss_release_name(&lmin_s, &conn->gtarg_nam);
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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, int payloadlen)
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{
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OM_uint32 maj_stat,
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min_stat;
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int maxlen;
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gss_buffer_desc temp_gbuf;
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char *host = PQhost(conn);
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if (!(host && host[0] != '\0'))
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{
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("host name must be specified\n"));
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return STATUS_ERROR;
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}
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if (conn->gctx)
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{
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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;
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}
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/*
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* Import service principal name so the proper ticket can be acquired by
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* the GSSAPI system.
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*/
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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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if (!temp_gbuf.value)
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{
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("out of memory\n"));
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return STATUS_ERROR;
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}
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snprintf(temp_gbuf.value, maxlen, "%s@%s",
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conn->krbsrvname, host);
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temp_gbuf.length = strlen(temp_gbuf.value);
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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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if (maj_stat != GSS_S_COMPLETE)
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{
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pg_GSS_error(libpq_gettext("GSSAPI name import error"),
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conn,
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maj_stat, min_stat);
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return STATUS_ERROR;
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}
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/*
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* Initial packet is the same as a continuation packet with no initial
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* context.
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*/
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conn->gctx = GSS_C_NO_CONTEXT;
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return pg_GSS_continue(conn, payloadlen);
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}
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#endif /* ENABLE_GSS */
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#ifdef ENABLE_SSPI
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/*
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* SSPI authentication system (Windows only)
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*/
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static void
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pg_SSPI_error(PGconn *conn, const char *mprefix, SECURITY_STATUS r)
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{
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char sysmsg[256];
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if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS |
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FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, r, 0,
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sysmsg, sizeof(sysmsg), NULL) == 0)
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printfPQExpBuffer(&conn->errorMessage, "%s: SSPI error %x\n",
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mprefix, (unsigned int) r);
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else
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printfPQExpBuffer(&conn->errorMessage, "%s: %s (%x)\n",
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mprefix, sysmsg, (unsigned int) r);
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}
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/*
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* Continue SSPI authentication with next token as needed.
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*/
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static int
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pg_SSPI_continue(PGconn *conn, int payloadlen)
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{
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SECURITY_STATUS r;
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CtxtHandle newContext;
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ULONG contextAttr;
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SecBufferDesc inbuf;
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SecBufferDesc outbuf;
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SecBuffer OutBuffers[1];
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SecBuffer InBuffers[1];
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char *inputbuf = NULL;
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if (conn->sspictx != NULL)
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{
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/*
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* On runs other than the first we have some data to send. Put this
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* data in a SecBuffer type structure.
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*/
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inputbuf = malloc(payloadlen);
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if (!inputbuf)
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{
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printfPQExpBuffer(&conn->errorMessage,
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libpq_gettext("out of memory allocating SSPI buffer (%d)\n"),
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payloadlen);
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return STATUS_ERROR;
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}
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if (pqGetnchar(inputbuf, payloadlen, conn))
|
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{
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/*
|
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* Shouldn't happen, because the caller should've ensured that the
|
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* whole message is already in the input buffer.
|
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*/
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free(inputbuf);
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return STATUS_ERROR;
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}
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inbuf.ulVersion = SECBUFFER_VERSION;
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inbuf.cBuffers = 1;
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inbuf.pBuffers = InBuffers;
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InBuffers[0].pvBuffer = inputbuf;
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InBuffers[0].cbBuffer = payloadlen;
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InBuffers[0].BufferType = SECBUFFER_TOKEN;
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}
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OutBuffers[0].pvBuffer = NULL;
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OutBuffers[0].BufferType = SECBUFFER_TOKEN;
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OutBuffers[0].cbBuffer = 0;
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outbuf.cBuffers = 1;
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outbuf.pBuffers = OutBuffers;
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outbuf.ulVersion = SECBUFFER_VERSION;
|
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|
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r = InitializeSecurityContext(conn->sspicred,
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conn->sspictx,
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conn->sspitarget,
|
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ISC_REQ_ALLOCATE_MEMORY,
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0,
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SECURITY_NETWORK_DREP,
|
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(conn->sspictx == NULL) ? NULL : &inbuf,
|
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0,
|
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&newContext,
|
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&outbuf,
|
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&contextAttr,
|
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NULL);
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|
|
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/* we don't need the input anymore */
|
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if (inputbuf)
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free(inputbuf);
|
|
|
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if (r != SEC_E_OK && r != SEC_I_CONTINUE_NEEDED)
|
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{
|
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pg_SSPI_error(conn, libpq_gettext("SSPI continuation error"), r);
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|
|
return STATUS_ERROR;
|
|
}
|
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|
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if (conn->sspictx == NULL)
|
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{
|
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/* On first run, transfer retrieved context handle */
|
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conn->sspictx = malloc(sizeof(CtxtHandle));
|
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if (conn->sspictx == NULL)
|
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{
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printfPQExpBuffer(&conn->errorMessage, libpq_gettext("out of memory\n"));
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return STATUS_ERROR;
|
|
}
|
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memcpy(conn->sspictx, &newContext, sizeof(CtxtHandle));
|
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}
|
|
|
|
/*
|
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* If SSPI returned any data to be sent to the server (as it normally
|
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* would), send this data as a password packet.
|
|
*/
|
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if (outbuf.cBuffers > 0)
|
|
{
|
|
if (outbuf.cBuffers != 1)
|
|
{
|
|
/*
|
|
* This should never happen, at least not for Kerberos
|
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* 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, int payloadlen)
|
|
{
|
|
SECURITY_STATUS r;
|
|
TimeStamp expire;
|
|
char *host = PQhost(conn);
|
|
|
|
if (conn->sspictx)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("duplicate SSPI authentication request\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Retrieve 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 (!(host && host[0] != '\0'))
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("host name must be specified\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
conn->sspitarget = malloc(strlen(conn->krbsrvname) + strlen(host) + 2);
|
|
if (!conn->sspitarget)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage, libpq_gettext("out of memory\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
sprintf(conn->sspitarget, "%s/%s", conn->krbsrvname, host);
|
|
|
|
/*
|
|
* 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, payloadlen);
|
|
}
|
|
#endif /* ENABLE_SSPI */
|
|
|
|
/*
|
|
* Initialize SASL authentication exchange.
|
|
*/
|
|
static int
|
|
pg_SASL_init(PGconn *conn, int payloadlen)
|
|
{
|
|
char *initialresponse = NULL;
|
|
int initialresponselen;
|
|
bool done;
|
|
bool success;
|
|
const char *selected_mechanism;
|
|
PQExpBufferData mechanism_buf;
|
|
|
|
initPQExpBuffer(&mechanism_buf);
|
|
|
|
if (conn->sasl_state)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("duplicate SASL authentication request\n"));
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* Parse the list of SASL authentication mechanisms in the
|
|
* AuthenticationSASL message, and select the best mechanism that we
|
|
* support. (Only SCRAM-SHA-256 is supported at the moment.)
|
|
*/
|
|
selected_mechanism = NULL;
|
|
for (;;)
|
|
{
|
|
if (pqGets(&mechanism_buf, conn))
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
"fe_sendauth: invalid authentication request from server: invalid list of authentication mechanisms\n");
|
|
goto error;
|
|
}
|
|
if (PQExpBufferDataBroken(mechanism_buf))
|
|
goto oom_error;
|
|
|
|
/* An empty string indicates end of list */
|
|
if (mechanism_buf.data[0] == '\0')
|
|
break;
|
|
|
|
/*
|
|
* If we have already selected a mechanism, just skip through the rest
|
|
* of the list.
|
|
*/
|
|
if (selected_mechanism)
|
|
continue;
|
|
|
|
/*
|
|
* Do we support this mechanism?
|
|
*/
|
|
if (strcmp(mechanism_buf.data, SCRAM_SHA256_NAME) == 0)
|
|
{
|
|
char *password;
|
|
|
|
conn->password_needed = true;
|
|
password = conn->connhost[conn->whichhost].password;
|
|
if (password == NULL)
|
|
password = conn->pgpass;
|
|
if (password == NULL || password[0] == '\0')
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
PQnoPasswordSupplied);
|
|
goto error;
|
|
}
|
|
|
|
conn->sasl_state = pg_fe_scram_init(conn->pguser, password);
|
|
if (!conn->sasl_state)
|
|
goto oom_error;
|
|
selected_mechanism = SCRAM_SHA256_NAME;
|
|
}
|
|
}
|
|
|
|
if (!selected_mechanism)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("none of the server's SASL authentication mechanisms are supported\n"));
|
|
goto error;
|
|
}
|
|
|
|
/* Get the mechanism-specific Initial Client Response, if any */
|
|
pg_fe_scram_exchange(conn->sasl_state,
|
|
NULL, -1,
|
|
&initialresponse, &initialresponselen,
|
|
&done, &success, &conn->errorMessage);
|
|
|
|
if (done && !success)
|
|
goto error;
|
|
|
|
/*
|
|
* Build a SASLInitialResponse message, and send it.
|
|
*/
|
|
if (pqPutMsgStart('p', true, conn))
|
|
goto error;
|
|
if (pqPuts(selected_mechanism, conn))
|
|
goto error;
|
|
if (initialresponse)
|
|
{
|
|
if (pqPutInt(initialresponselen, 4, conn))
|
|
goto error;
|
|
if (pqPutnchar(initialresponse, initialresponselen, conn))
|
|
goto error;
|
|
}
|
|
if (pqPutMsgEnd(conn))
|
|
goto error;
|
|
if (pqFlush(conn))
|
|
goto error;
|
|
|
|
termPQExpBuffer(&mechanism_buf);
|
|
if (initialresponse)
|
|
free(initialresponse);
|
|
|
|
return STATUS_OK;
|
|
|
|
error:
|
|
termPQExpBuffer(&mechanism_buf);
|
|
if (initialresponse)
|
|
free(initialresponse);
|
|
return STATUS_ERROR;
|
|
|
|
oom_error:
|
|
termPQExpBuffer(&mechanism_buf);
|
|
if (initialresponse)
|
|
free(initialresponse);
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("out of memory\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Exchange a message for SASL communication protocol with the backend.
|
|
* This should be used after calling pg_SASL_init to set up the status of
|
|
* the protocol.
|
|
*/
|
|
static int
|
|
pg_SASL_continue(PGconn *conn, int payloadlen, bool final)
|
|
{
|
|
char *output;
|
|
int outputlen;
|
|
bool done;
|
|
bool success;
|
|
int res;
|
|
char *challenge;
|
|
|
|
/* Read the SASL challenge from the AuthenticationSASLContinue message. */
|
|
challenge = malloc(payloadlen + 1);
|
|
if (!challenge)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("out of memory allocating SASL buffer (%d)\n"),
|
|
payloadlen);
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
if (pqGetnchar(challenge, payloadlen, conn))
|
|
{
|
|
free(challenge);
|
|
return STATUS_ERROR;
|
|
}
|
|
/* For safety and convenience, ensure the buffer is NULL-terminated. */
|
|
challenge[payloadlen] = '\0';
|
|
|
|
pg_fe_scram_exchange(conn->sasl_state,
|
|
challenge, payloadlen,
|
|
&output, &outputlen,
|
|
&done, &success, &conn->errorMessage);
|
|
free(challenge); /* don't need the input anymore */
|
|
|
|
if (final && !done)
|
|
{
|
|
if (outputlen != 0)
|
|
free(output);
|
|
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("AuthenticationSASLFinal received from server, but SASL authentication was not completed\n"));
|
|
return STATUS_ERROR;
|
|
}
|
|
if (outputlen != 0)
|
|
{
|
|
/*
|
|
* Send the SASL response to the server.
|
|
*/
|
|
res = pqPacketSend(conn, 'p', output, outputlen);
|
|
free(output);
|
|
|
|
if (res != STATUS_OK)
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
if (done && !success)
|
|
return STATUS_ERROR;
|
|
|
|
return STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
* Respond to AUTH_REQ_SCM_CREDS challenge.
|
|
*
|
|
* Note: this is dead code as of Postgres 9.1, because current backends will
|
|
* never send this challenge. But we must keep it as long as libpq needs to
|
|
* interoperate with pre-9.1 servers. It is believed to be needed only on
|
|
* Debian/kFreeBSD (ie, FreeBSD kernel with Linux userland, so that the
|
|
* getpeereid() function isn't provided by libc).
|
|
*/
|
|
static int
|
|
pg_local_sendauth(PGconn *conn)
|
|
{
|
|
#ifdef HAVE_STRUCT_CMSGCRED
|
|
char buf;
|
|
struct iovec iov;
|
|
struct msghdr msg;
|
|
struct cmsghdr *cmsg;
|
|
union
|
|
{
|
|
struct cmsghdr hdr;
|
|
unsigned char buf[CMSG_SPACE(sizeof(struct cmsgcred))];
|
|
} cmsgbuf;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/* We must set up a message that will be filled in by kernel */
|
|
memset(&cmsgbuf, 0, sizeof(cmsgbuf));
|
|
msg.msg_control = &cmsgbuf.buf;
|
|
msg.msg_controllen = sizeof(cmsgbuf.buf);
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_CREDS;
|
|
|
|
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 = NULL;
|
|
const char *pwd_to_send;
|
|
char md5Salt[4];
|
|
|
|
/* Read the salt from the AuthenticationMD5 message. */
|
|
if (areq == AUTH_REQ_MD5)
|
|
{
|
|
if (pqGetnchar(md5Salt, 4, conn))
|
|
return STATUS_ERROR; /* shouldn't happen */
|
|
}
|
|
|
|
/* 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"), md5Salt,
|
|
4, crypt_pwd))
|
|
{
|
|
free(crypt_pwd);
|
|
return STATUS_ERROR;
|
|
}
|
|
|
|
pwd_to_send = crypt_pwd;
|
|
break;
|
|
}
|
|
case AUTH_REQ_PASSWORD:
|
|
pwd_to_send = 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', pwd_to_send, strlen(pwd_to_send) + 1);
|
|
else
|
|
ret = pqPacketSend(conn, 0, pwd_to_send, strlen(pwd_to_send) + 1);
|
|
if (crypt_pwd)
|
|
free(crypt_pwd);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* pg_fe_sendauth
|
|
* client demux routine for processing an authentication request
|
|
*
|
|
* The server has sent us an authentication challenge (or OK). Send an
|
|
* appropriate response. The caller has ensured that the whole message is
|
|
* now in the input buffer, and has already read the type and length of
|
|
* it. We are responsible for reading any remaining extra data, specific
|
|
* to the authentication method. 'payloadlen' is the remaining length in
|
|
* the message.
|
|
*/
|
|
int
|
|
pg_fe_sendauth(AuthRequest areq, int payloadlen, 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:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("Kerberos 5 authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
|
|
#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
|
|
case AUTH_REQ_GSS:
|
|
#if !defined(ENABLE_SSPI)
|
|
/* no native SSPI, so use GSSAPI library for it */
|
|
case AUTH_REQ_SSPI:
|
|
#endif
|
|
{
|
|
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, payloadlen);
|
|
else
|
|
r = pg_SSPI_startup(conn, 0, payloadlen);
|
|
#elif defined(ENABLE_GSS) && !defined(ENABLE_SSPI)
|
|
r = pg_GSS_startup(conn, payloadlen);
|
|
#elif !defined(ENABLE_GSS) && defined(ENABLE_SSPI)
|
|
r = pg_SSPI_startup(conn, 0, payloadlen);
|
|
#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, payloadlen);
|
|
else
|
|
r = pg_GSS_continue(conn, payloadlen);
|
|
#elif defined(ENABLE_GSS) && !defined(ENABLE_SSPI)
|
|
r = pg_GSS_continue(conn, payloadlen);
|
|
#elif !defined(ENABLE_GSS) && defined(ENABLE_SSPI)
|
|
r = pg_SSPI_continue(conn, payloadlen);
|
|
#endif
|
|
if (r != STATUS_OK)
|
|
{
|
|
/* Error message already filled in. */
|
|
pgunlock_thread();
|
|
return STATUS_ERROR;
|
|
}
|
|
pgunlock_thread();
|
|
}
|
|
break;
|
|
#else /* defined(ENABLE_GSS) || defined(ENABLE_SSPI) */
|
|
/* No GSSAPI *or* SSPI support */
|
|
case AUTH_REQ_GSS:
|
|
case AUTH_REQ_GSS_CONT:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("GSSAPI authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
#endif /* defined(ENABLE_GSS) || defined(ENABLE_SSPI) */
|
|
|
|
#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, payloadlen) != STATUS_OK)
|
|
{
|
|
/* Error message already filled in. */
|
|
pgunlock_thread();
|
|
return STATUS_ERROR;
|
|
}
|
|
pgunlock_thread();
|
|
break;
|
|
#else
|
|
|
|
/*
|
|
* No SSPI support. However, if we have GSSAPI but not SSPI
|
|
* support, AUTH_REQ_SSPI will have been handled in the codepath
|
|
* for AUTH_REQ_GSSAPI above, so don't duplicate the case label in
|
|
* that case.
|
|
*/
|
|
#if !defined(ENABLE_GSS)
|
|
case AUTH_REQ_SSPI:
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("SSPI authentication not supported\n"));
|
|
return STATUS_ERROR;
|
|
#endif /* !define(ENABLE_GSSAPI) */
|
|
#endif /* ENABLE_SSPI */
|
|
|
|
|
|
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:
|
|
{
|
|
char *password;
|
|
|
|
conn->password_needed = true;
|
|
password = conn->connhost[conn->whichhost].password;
|
|
if (password == NULL)
|
|
password = conn->pgpass;
|
|
if (password == NULL || password[0] == '\0')
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
PQnoPasswordSupplied);
|
|
return STATUS_ERROR;
|
|
}
|
|
if (pg_password_sendauth(conn, password, areq) != STATUS_OK)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
"fe_sendauth: error sending password authentication\n");
|
|
return STATUS_ERROR;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case AUTH_REQ_SASL:
|
|
|
|
/*
|
|
* The request contains the name (as assigned by IANA) of the
|
|
* authentication mechanism.
|
|
*/
|
|
if (pg_SASL_init(conn, payloadlen) != STATUS_OK)
|
|
{
|
|
/* pg_SASL_init already set the error message */
|
|
return STATUS_ERROR;
|
|
}
|
|
break;
|
|
|
|
case AUTH_REQ_SASL_CONT:
|
|
case AUTH_REQ_SASL_FIN:
|
|
if (conn->sasl_state == NULL)
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
"fe_sendauth: invalid authentication request from server: AUTH_REQ_SASL_CONT without AUTH_REQ_SASL\n");
|
|
return STATUS_ERROR;
|
|
}
|
|
if (pg_SASL_continue(conn, payloadlen,
|
|
(areq == AUTH_REQ_SASL_FIN)) != STATUS_OK)
|
|
{
|
|
/* Use error message, if set already */
|
|
if (conn->errorMessage.len == 0)
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
"fe_sendauth: error in SASL 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 malloc'd space containing whatever name the user
|
|
* has authenticated to the system. If there is an error, return NULL,
|
|
* and put a suitable error message in *errorMessage if that's not NULL.
|
|
*/
|
|
char *
|
|
pg_fe_getauthname(PQExpBuffer errorMessage)
|
|
{
|
|
char *result = NULL;
|
|
const char *name = NULL;
|
|
|
|
#ifdef WIN32
|
|
/* Microsoft recommends buffer size of UNLEN+1, where UNLEN = 256 */
|
|
char username[256 + 1];
|
|
DWORD namesize = sizeof(username);
|
|
#else
|
|
uid_t user_id = geteuid();
|
|
char pwdbuf[BUFSIZ];
|
|
struct passwd pwdstr;
|
|
struct passwd *pw = NULL;
|
|
int pwerr;
|
|
#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();
|
|
|
|
#ifdef WIN32
|
|
if (GetUserName(username, &namesize))
|
|
name = username;
|
|
else if (errorMessage)
|
|
printfPQExpBuffer(errorMessage,
|
|
libpq_gettext("user name lookup failure: error code %lu\n"),
|
|
GetLastError());
|
|
#else
|
|
pwerr = pqGetpwuid(user_id, &pwdstr, pwdbuf, sizeof(pwdbuf), &pw);
|
|
if (pw != NULL)
|
|
name = pw->pw_name;
|
|
else if (errorMessage)
|
|
{
|
|
if (pwerr != 0)
|
|
printfPQExpBuffer(errorMessage,
|
|
libpq_gettext("could not look up local user ID %d: %s\n"),
|
|
(int) user_id,
|
|
pqStrerror(pwerr, pwdbuf, sizeof(pwdbuf)));
|
|
else
|
|
printfPQExpBuffer(errorMessage,
|
|
libpq_gettext("local user with ID %d does not exist\n"),
|
|
(int) user_id);
|
|
}
|
|
#endif
|
|
|
|
if (name)
|
|
{
|
|
result = strdup(name);
|
|
if (result == NULL && errorMessage)
|
|
printfPQExpBuffer(errorMessage,
|
|
libpq_gettext("out of memory\n"));
|
|
}
|
|
|
|
pgunlock_thread();
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/*
|
|
* PQencryptPassword -- exported routine to encrypt a password with MD5
|
|
*
|
|
* This function is equivalent to calling PQencryptPasswordConn with
|
|
* "md5" as the encryption method, except that this doesn't require
|
|
* a connection object. This function is deprecated, use
|
|
* PQencryptPasswordConn instead.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* PQencryptPasswordConn -- 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 encryption is MD5
|
|
* or something else.
|
|
*
|
|
* Arguments are a connection object, the cleartext password, the SQL
|
|
* name of the user it is for, and a string indicating the algorithm to
|
|
* use for encrypting the password. If algorithm is NULL, this queries
|
|
* the server for the current 'password_encryption' value. If you wish
|
|
* to avoid that, e.g. to avoid blocking, you can execute
|
|
* 'show password_encryption' yourself before calling this function, and
|
|
* pass it as the algorithm.
|
|
*
|
|
* Return value is a malloc'd string. The client may assume the string
|
|
* doesn't contain any special characters that would require escaping.
|
|
* On error, an error message is stored in the connection object, and
|
|
* returns NULL.
|
|
*/
|
|
char *
|
|
PQencryptPasswordConn(PGconn *conn, const char *passwd, const char *user,
|
|
const char *algorithm)
|
|
{
|
|
#define MAX_ALGORITHM_NAME_LEN 50
|
|
char algobuf[MAX_ALGORITHM_NAME_LEN + 1];
|
|
char *crypt_pwd = NULL;
|
|
|
|
if (!conn)
|
|
return NULL;
|
|
|
|
/* If no algorithm was given, ask the server. */
|
|
if (algorithm == NULL)
|
|
{
|
|
PGresult *res;
|
|
char *val;
|
|
|
|
res = PQexec(conn, "show password_encryption");
|
|
if (res == NULL)
|
|
{
|
|
/* PQexec() should've set conn->errorMessage already */
|
|
return NULL;
|
|
}
|
|
if (PQresultStatus(res) != PGRES_TUPLES_OK)
|
|
{
|
|
/* PQexec() should've set conn->errorMessage already */
|
|
PQclear(res);
|
|
return NULL;
|
|
}
|
|
if (PQntuples(res) != 1 || PQnfields(res) != 1)
|
|
{
|
|
PQclear(res);
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("unexpected shape of result set returned for SHOW\n"));
|
|
return NULL;
|
|
}
|
|
val = PQgetvalue(res, 0, 0);
|
|
|
|
if (strlen(val) > MAX_ALGORITHM_NAME_LEN)
|
|
{
|
|
PQclear(res);
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("password_encryption value too long\n"));
|
|
return NULL;
|
|
}
|
|
strcpy(algobuf, val);
|
|
PQclear(res);
|
|
|
|
algorithm = algobuf;
|
|
}
|
|
|
|
/*
|
|
* Also accept "on" and "off" as aliases for "md5", because
|
|
* password_encryption was a boolean before PostgreSQL 10. We refuse to
|
|
* send the password in plaintext even if it was "off".
|
|
*/
|
|
if (strcmp(algorithm, "on") == 0 ||
|
|
strcmp(algorithm, "off") == 0)
|
|
algorithm = "md5";
|
|
|
|
/*
|
|
* Ok, now we know what algorithm to use
|
|
*/
|
|
if (strcmp(algorithm, "scram-sha-256") == 0)
|
|
{
|
|
crypt_pwd = pg_fe_scram_build_verifier(passwd);
|
|
}
|
|
else if (strcmp(algorithm, "md5") == 0)
|
|
{
|
|
crypt_pwd = malloc(MD5_PASSWD_LEN + 1);
|
|
if (crypt_pwd)
|
|
{
|
|
if (!pg_md5_encrypt(passwd, user, strlen(user), crypt_pwd))
|
|
{
|
|
free(crypt_pwd);
|
|
crypt_pwd = NULL;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("unrecognized password encryption algorithm \"%s\"\n"),
|
|
algorithm);
|
|
return NULL;
|
|
}
|
|
|
|
if (!crypt_pwd)
|
|
printfPQExpBuffer(&conn->errorMessage,
|
|
libpq_gettext("out of memory\n"));
|
|
|
|
return crypt_pwd;
|
|
}
|