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Commitc89404e

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Fix libpq certificate validation for SSL connections.
Add config parameter "sslverify" to control the verification. Defaultis to do full verification.Clean up some old SSL code that never really worked.
1 parente7d8bfb commitc89404e

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5 files changed

+139
-77
lines changed

5 files changed

+139
-77
lines changed

‎doc/src/sgml/libpq.sgml‎

Lines changed: 49 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.268 2008/11/09 00:28:34 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.269 2008/11/13 09:45:24 mha Exp $ -->
22

33
<chapter id="libpq">
44
<title><application>libpq</application> - C Library</title>
@@ -259,6 +259,33 @@
259259
</listitem>
260260
</varlistentry>
261261

262+
<varlistentry>
263+
<term><literal>sslverify</literal></term>
264+
<listitem>
265+
<para>
266+
This option controls how libpq verifies the certificate on the
267+
server when performing an <acronym>SSL</> connection. There are
268+
three options: <literal>none</> disables verification completely
269+
(not recommended!); <literal>cert</> enables verification that
270+
the certificate chains to a known CA only; <literal>cn</> will
271+
both verify that the certificate chains to a known CA and that
272+
the <literal>cn</> attribute of the certificate matches the
273+
hostname the connection is being made to (default).
274+
</para>
275+
276+
<para>
277+
It is always recommended to use the <literal>cn</> value for
278+
this parameter, since this is the only option that prevents
279+
man-in-the-middle attacks. Note that this requires the server
280+
name on the certificate to match exactly with the host name
281+
used for the connection, and therefore does not support connections
282+
to aliased names. It can be used with pure IP address connections
283+
only if the certificate also has just the IP address in the
284+
<literal>cn</> field.
285+
</para>
286+
</listitem>
287+
</varlistentry>
288+
262289
<varlistentry>
263290
<term><literal>requiressl</literal></term>
264291
<listitem>
@@ -5679,6 +5706,22 @@ myEventProc(PGEventId evtId, void *evtInfo, void *passThrough)
56795706
</para>
56805707
</listitem>
56815708

5709+
<listitem>
5710+
<para>
5711+
<indexterm>
5712+
<primary><envar>PGSSLVERIFY</envar></primary>
5713+
</indexterm>
5714+
<envar>PGSSLVERIFY</envar> controls how libpq verifies the certificate on the
5715+
server when performing an <acronym>SSL</> connection. There are
5716+
three options: <literal>none</> disables verification completely
5717+
(not recommended!); <literal>cert</> enables verification that
5718+
the certificate chains to a known CA only; <literal>cn</> will
5719+
both verify that the certificate chains to a known CA and that
5720+
the <literal>cn</> attribute of the certificate matches the
5721+
hostname the connection is being made to (default).
5722+
</para>
5723+
</listitem>
5724+
56825725
<listitem>
56835726
<para>
56845727
<indexterm>
@@ -6026,9 +6069,11 @@ myEventProc(PGEventId evtId, void *evtInfo, void *passThrough)
60266069
</para>
60276070

60286071
<para>
6029-
To verify the server certificate is trustworthy, place certificates of
6030-
the certificate authorities (<acronym>CA</acronym>) you trust in the
6031-
file <filename>~/.postgresql/root.crt</> in the user's home directory.
6072+
When the <literal>sslverify</> parameter is set to <literal>cn</> or
6073+
<literal>cert</>, libpq will verify that the server certificate is
6074+
trustworthy by checking the certificate chain up to a <acronym>CA</>.
6075+
For this to work, place the certificate of a trusted <acronym>CA</>
6076+
in the file <filename>~/.postgresql/root.crt</> in the user's home directory.
60326077
(On Microsoft Windows the file is named
60336078
<filename>%APPDATA%\postgresql\root.crt</filename>.)
60346079
<application>libpq</application> will then verify that the server's

‎doc/src/sgml/runtime.sgml‎

Lines changed: 9 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.419 2008/11/04 04:18:50 momjian Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.420 2008/11/13 09:45:24 mha Exp $ -->
22

33
<chapter Id="runtime">
44
<title>Operating System Environment</title>
@@ -1418,9 +1418,9 @@ $ <userinput>kill -INT `head -1 /usr/local/pgsql/data/postmaster.pid`</userinput
14181418
<filename>server.key</filename> (key) and
14191419
<filename>server.crt</filename> (certificate) files (<xref
14201420
linkend="ssl-tcp">). The TCP client must connect using
1421-
<literal>sslmode='require'</> (<xref linkend="libpq-connect">) and have
1422-
a <filename>~/.postgresql/root.crt</>SSL certificate (<xref
1423-
linkend="libpq-ssl">).
1421+
<literal>sslmode='require'</>, specify <literal>sslverify='cn'</>
1422+
or <literal>sslverify='cert'</>and have the required certificate
1423+
files present (<xreflinkend="libpq-connect">).
14241424
</para>
14251425
</sect1>
14261426

@@ -1544,8 +1544,8 @@ $ <userinput>kill -INT `head -1 /usr/local/pgsql/data/postmaster.pid`</userinput
15441544

15451545
<listitem>
15461546
<para>
1547-
It is possible for both the client and server to provide SSL keys
1548-
orcertificates to each other. It takes some extra configuration
1547+
It is possible for both the client and server to provide SSL
1548+
certificates to each other. It takes some extra configuration
15491549
on each side, but this provides stronger verification of identity
15501550
than the mere use of passwords. It prevents a computer from
15511551
pretending to be the server just long enough to read the password
@@ -1757,7 +1757,9 @@ chmod og-rwx server.key
17571757
A self-signed certificate can be used for testing, but a certificate
17581758
signed by a certificate authority (<acronym>CA</>) (either one of the
17591759
global <acronym>CAs</> or a local one) should be used in production
1760-
so the client can verify the server's identity.
1760+
so the client can verify the server's identity. If all the clients
1761+
are local to the organization, using a local <acronym>CA</> is
1762+
recommended.
17611763
</para>
17621764

17631765
</sect2>

‎src/interfaces/libpq/fe-connect.c‎

Lines changed: 28 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.367 2008/11/09 00:28:35 tgl Exp $
11+
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.368 2008/11/13 09:45:24 mha Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -92,8 +92,10 @@ static int ldapServiceLookup(const char *purl, PQconninfoOption *options,
9292
#defineDefaultPassword ""
9393
#ifdefUSE_SSL
9494
#defineDefaultSSLMode"prefer"
95+
#defineDefaultSSLVerify "cn"
9596
#else
9697
#defineDefaultSSLMode"disable"
98+
#defineDefaultSSLVerify "none"
9799
#endif
98100

99101
/* ----------
@@ -181,6 +183,9 @@ static const PQconninfoOption PQconninfoOptions[] = {
181183
{"sslmode","PGSSLMODE",DefaultSSLMode,NULL,
182184
"SSL-Mode","",8},/* sizeof("disable") == 8 */
183185

186+
{"sslverify","PGSSLVERIFY",DefaultSSLVerify,NULL,
187+
"SSL-Verify","",5},/* sizeof("chain") == 5 */
188+
184189
#if defined(KRB5)||defined(ENABLE_GSS)||defined(ENABLE_SSPI)
185190
/* Kerberos and GSSAPI authentication support specifying the service name */
186191
{"krbsrvname","PGKRBSRVNAME",PG_KRB_SRVNAM,NULL,
@@ -415,6 +420,8 @@ connectOptions1(PGconn *conn, const char *conninfo)
415420
conn->connect_timeout=tmp ?strdup(tmp) :NULL;
416421
tmp=conninfo_getval(connOptions,"sslmode");
417422
conn->sslmode=tmp ?strdup(tmp) :NULL;
423+
tmp=conninfo_getval(connOptions,"sslverify");
424+
conn->sslverify=tmp ?strdup(tmp) :NULL;
418425
#ifdefUSE_SSL
419426
tmp=conninfo_getval(connOptions,"requiressl");
420427
if (tmp&&tmp[0]=='1')
@@ -529,6 +536,24 @@ connectOptions2(PGconn *conn)
529536
else
530537
conn->sslmode=strdup(DefaultSSLMode);
531538

539+
/*
540+
* Validate sslverify option
541+
*/
542+
if (conn->sslverify)
543+
{
544+
if (strcmp(conn->sslverify,"none")!=0
545+
&&strcmp(conn->sslverify,"cert")!=0
546+
&&strcmp(conn->sslverify,"cn")!=0)
547+
{
548+
conn->status=CONNECTION_BAD;
549+
printfPQExpBuffer(&conn->errorMessage,
550+
libpq_gettext("invalid sslverify value: \"%s\"\n"),
551+
conn->sslverify);
552+
return false;
553+
}
554+
}
555+
556+
532557
/*
533558
* Only if we get this far is it appropriate to try to connect. (We need a
534559
* state flag, rather than just the boolean result of this function, in
@@ -2008,6 +2033,8 @@ freePGconn(PGconn *conn)
20082033
free(conn->pgpass);
20092034
if (conn->sslmode)
20102035
free(conn->sslmode);
2036+
if (conn->sslverify)
2037+
free(conn->sslverify);
20112038
#if defined(KRB5)|| defined(ENABLE_GSS)|| defined(ENABLE_SSPI)
20122039
if (conn->krbsrvname)
20132040
free(conn->krbsrvname);

‎src/interfaces/libpq/fe-secure.c‎

Lines changed: 51 additions & 64 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-secure.c,v 1.106 2008/10/24 12:29:11 mha Exp $
14+
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-secure.c,v 1.107 2008/11/13 09:45:25 mha Exp $
1515
*
1616
* NOTES
1717
*
@@ -87,9 +87,7 @@
8787
#defineERR_pop_to_mark()((void) 0)
8888
#endif
8989

90-
#ifdefNOT_USED
91-
staticintverify_peer_name_matches_certificate(PGconn*);
92-
#endif
90+
staticboolverify_peer_name_matches_certificate(PGconn*);
9391
staticintverify_cb(intok,X509_STORE_CTX*ctx);
9492
staticintclient_cert_cb(SSL*,X509**,EVP_PKEY**);
9593
staticintinit_ssl_system(PGconn*conn);
@@ -438,77 +436,44 @@ verify_cb(int ok, X509_STORE_CTX *ctx)
438436
returnok;
439437
}
440438

441-
#ifdefNOT_USED
442439
/*
443440
*Verify that common name resolves to peer.
444441
*/
445-
staticint
442+
staticbool
446443
verify_peer_name_matches_certificate(PGconn*conn)
447444
{
448-
structhostent*cn_hostentry=NULL;
449-
structsockaddrserver_addr;
450-
structsockaddr_in*sin (structsockaddr_in*)&server_addr;
451-
ACCEPT_TYPE_ARG3len;
452-
char**s;
453-
unsigned longl;
454-
455-
/* Get the address on the other side of the socket. */
456-
len=sizeof(server_addr);
457-
if (getpeername(conn->sock,&server_addr,&len)==-1)
458-
{
459-
charsebuf[256];
460-
461-
printfPQExpBuffer(&conn->errorMessage,
462-
libpq_gettext("error querying socket: %s\n"),
463-
SOCK_STRERROR(SOCK_ERRNO,sebuf,sizeof(sebuf)));
464-
return-1;
465-
}
445+
/*
446+
* If told not to verify the peer name, don't do it. Return
447+
* 0 indicating that the verification was successful.
448+
*/
449+
if(strcmp(conn->sslverify,"cn")!=0)
450+
return true;
466451

467-
if (server_addr.sa_family!=AF_INET)
452+
if (conn->pghostaddr)
468453
{
469454
printfPQExpBuffer(&conn->errorMessage,
470-
libpq_gettext("unsupported protocol\n"));
471-
return-1;
455+
libpq_gettext("verified SSL connections are only supported when connecting to a hostname"));
456+
returnfalse;
472457
}
473-
474-
/* Get the IP addresses of the certificate's common name (CN) */
458+
else
475459
{
476-
structhostenthpstr;
477-
charbuf[BUFSIZ];
478-
intherrno=0;
479-
480460
/*
481-
* Currently, pqGethostbyname() is used only on platforms that don't
482-
* have getaddrinfo().If you enable this function, you should
483-
* convert the pqGethostbyname() function call to use getaddrinfo().
461+
* Connect by hostname.
462+
*
463+
* XXX: Should support alternate names here
464+
* XXX: Should support wildcard certificates here
484465
*/
485-
pqGethostbyname(conn->peer_cn,&hpstr,buf,sizeof(buf),
486-
&cn_hostentry,&herrno);
487-
}
488-
489-
/* Did we get an IP address? */
490-
if (cn_hostentry==NULL)
491-
{
492-
printfPQExpBuffer(&conn->errorMessage,
493-
libpq_gettext("could not get information about host \"%s\": %s\n"),
494-
conn->peer_cn,hstrerror(h_errno));
495-
return-1;
466+
if (pg_strcasecmp(conn->peer_cn,conn->pghost)!=0)
467+
{
468+
printfPQExpBuffer(&conn->errorMessage,
469+
libpq_gettext("server common name '%s' does not match hostname '%s'"),
470+
conn->peer_cn,conn->pghost);
471+
return false;
472+
}
473+
else
474+
return true;
496475
}
497-
498-
/* Does one of the CN's IP addresses match the server's IP address? */
499-
for (s=cn_hostentry->h_addr_list;*s!=NULL;s++)
500-
if (!memcmp(&sin->sin_addr.s_addr,*s,cn_hostentry->h_length))
501-
return0;
502-
503-
l=ntohl(sin->sin_addr.s_addr);
504-
printfPQExpBuffer(&conn->errorMessage,
505-
libpq_gettext(
506-
"server common name \"%s\" does not resolve to %ld.%ld.%ld.%ld\n"),
507-
conn->peer_cn, (l >>24) %0x100, (l >>16) %0x100,
508-
(l >>8) %0x100,l %0x100);
509-
return-1;
510476
}
511-
#endif/* NOT_USED */
512477

513478
/*
514479
*Callback used by SSL to load client cert and key.
@@ -846,6 +811,12 @@ initialize_SSL(PGconn *conn)
846811
if (init_ssl_system(conn))
847812
return-1;
848813

814+
/*
815+
* If sslverify is set to anything other than "none", perform certificate
816+
* verification. If set to "cn" we will also do further verifications after
817+
* the connection has been completed.
818+
*/
819+
849820
/* Set up to verify server cert, if root.crt is present */
850821
if (pqGetHomeDirectory(homedir,sizeof(homedir)))
851822
{
@@ -889,6 +860,24 @@ initialize_SSL(PGconn *conn)
889860

890861
SSL_CTX_set_verify(SSL_context,SSL_VERIFY_PEER,verify_cb);
891862
}
863+
else
864+
{
865+
if (strcmp(conn->sslverify,"none")!=0)
866+
{
867+
printfPQExpBuffer(&conn->errorMessage,
868+
libpq_gettext("root certificate file (%s) not found"),fnbuf);
869+
return-1;
870+
}
871+
}
872+
}
873+
else
874+
{
875+
if (strcmp(conn->sslverify,"none")!=0)
876+
{
877+
printfPQExpBuffer(&conn->errorMessage,
878+
libpq_gettext("cannot find home directory to locate root certificate file"));
879+
return-1;
880+
}
892881
}
893882

894883
/* set up mechanism to provide client certificate, if available */
@@ -1004,13 +993,11 @@ open_client_SSL(PGconn *conn)
1004993
NID_commonName,conn->peer_cn,SM_USER);
1005994
conn->peer_cn[SM_USER]='\0';
1006995

1007-
#ifdefNOT_USED
1008-
if (verify_peer_name_matches_certificate(conn)==-1)
996+
if (!verify_peer_name_matches_certificate(conn))
1009997
{
1010998
close_SSL(conn);
1011999
returnPGRES_POLLING_FAILED;
10121000
}
1013-
#endif
10141001

10151002
/* SSL handshake is complete */
10161003
returnPGRES_POLLING_OK;

‎src/interfaces/libpq/libpq-int.h‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -12,7 +12,7 @@
1212
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
1313
* Portions Copyright (c) 1994, Regents of the University of California
1414
*
15-
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.136 2008/10/28 12:10:44 mha Exp $
15+
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.137 2008/11/13 09:45:25 mha Exp $
1616
*
1717
*-------------------------------------------------------------------------
1818
*/
@@ -291,6 +291,7 @@ struct pg_conn
291291
char*pguser;/* Postgres username and password, if any */
292292
char*pgpass;
293293
char*sslmode;/* SSL mode (require,prefer,allow,disable) */
294+
char*sslverify;/* Verify server SSL certificate (none,chain,cn) */
294295
#if defined(KRB5)|| defined(ENABLE_GSS)|| defined(ENABLE_SSPI)
295296
char*krbsrvname;/* Kerberos service name */
296297
#endif

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