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Commit3ca1949

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Fix up usage of krb_server_keyfile GUC parameter.
secure_open_gssapi() installed the krb_server_keyfile setting asKRB5_KTNAME unconditionally, so long as it's not empty. However,pg_GSS_recvauth() only installed it if KRB5_KTNAME wasn't set already,leading to a troubling inconsistency: in theory, clients could seedifferent sets of server principal names depending on whether theyuse GSSAPI encryption. Always using krb_server_keyfile seems likethe right thing, so make both places do that. Also fix upsecure_open_gssapi()'s lack of a check for setenv() failure ---it's unlikely, surely, but security-critical actions are no placeto be sloppy.Also improve the associated documentation.This patch does nothing about secure_open_gssapi()'s use of setenv(),and indeed causes pg_GSS_recvauth() to use it too. That's nominallyagainst project portability rules, but since this code is only builtwith --with-gssapi, I do not feel a need to do something about thisin the back branches. A fix will be forthcoming for HEAD though.Back-patch to v12 where GSSAPI encryption was introduced. Thedubious behavior in pg_GSS_recvauth() goes back further, but itdidn't have anything to be inconsistent with, so let it be.Discussion:https://postgr.es/m/2187460.1609263156@sss.pgh.pa.us
1 parent635140a commit3ca1949

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5 files changed

+31
-32
lines changed

5 files changed

+31
-32
lines changed

‎doc/src/sgml/client-auth.sgml‎

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1262,11 +1262,7 @@ omicron bryanh guest1
12621262

12631263
<para>
12641264
The location of the server's keytab file is specified by the <xref
1265-
linkend="guc-krb-server-keyfile"/> configuration
1266-
parameter. The default is
1267-
<filename>FILE:/usr/local/pgsql/etc/krb5.keytab</filename>
1268-
(where the directory part is whatever was specified
1269-
as <varname>sysconfdir</varname> at build time).
1265+
linkend="guc-krb-server-keyfile"/> configuration parameter.
12701266
For security reasons, it is recommended to use a separate keytab
12711267
just for the <productname>PostgreSQL</productname> server rather
12721268
than allowing the server to read the system keytab file.

‎doc/src/sgml/config.sgml‎

Lines changed: 9 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1040,10 +1040,16 @@ include_dir 'conf.d'
10401040
</term>
10411041
<listitem>
10421042
<para>
1043-
Sets the location of the Kerberos server key file. See
1044-
<xref linkend="gssapi-auth"/>
1045-
for details. This parameter can only be set in the
1043+
Sets the location of the server's Kerberos key file. The default is
1044+
<filename>FILE:/usr/local/pgsql/etc/krb5.keytab</filename>
1045+
(where the directory part is whatever was specified
1046+
as <varname>sysconfdir</varname> at build time; use
1047+
<literal>pg_config --sysconfdir</literal> to determine that).
1048+
If this parameter is set to an empty string, it is ignored and a
1049+
system-dependent default is used.
1050+
This parameter can only be set in the
10461051
<filename>postgresql.conf</filename> file or on the server command line.
1052+
See <xref linkend="gssapi-auth"/> for more information.
10471053
</para>
10481054
</listitem>
10491055
</varlistentry>

‎src/backend/libpq/auth.c‎

Lines changed: 10 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -1057,29 +1057,18 @@ pg_GSS_recvauth(Port *port)
10571057
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10581058
errmsg("GSSAPI is not supported in protocol version 2")));
10591059

1060-
if (pg_krb_server_keyfile&&strlen(pg_krb_server_keyfile)>0)
1060+
/*
1061+
* Use the configured keytab, if there is one. Unfortunately, Heimdal
1062+
* doesn't support the cred store extensions, so use the env var.
1063+
*/
1064+
if (pg_krb_server_keyfile!=NULL&&pg_krb_server_keyfile[0]!='\0')
10611065
{
1062-
/*
1063-
* Set default Kerberos keytab file for the Krb5 mechanism.
1064-
*
1065-
* setenv("KRB5_KTNAME", pg_krb_server_keyfile, 0); except setenv()
1066-
* not always available.
1067-
*/
1068-
if (getenv("KRB5_KTNAME")==NULL)
1066+
if (setenv("KRB5_KTNAME",pg_krb_server_keyfile,1)!=0)
10691067
{
1070-
size_tkt_len=strlen(pg_krb_server_keyfile)+14;
1071-
char*kt_path=malloc(kt_len);
1072-
1073-
if (!kt_path||
1074-
snprintf(kt_path,kt_len,"KRB5_KTNAME=%s",
1075-
pg_krb_server_keyfile)!=kt_len-2||
1076-
putenv(kt_path)!=0)
1077-
{
1078-
ereport(LOG,
1079-
(errcode(ERRCODE_OUT_OF_MEMORY),
1080-
errmsg("out of memory")));
1081-
returnSTATUS_ERROR;
1082-
}
1068+
/* The only likely failure cause is OOM, so use that errcode */
1069+
ereport(FATAL,
1070+
(errcode(ERRCODE_OUT_OF_MEMORY),
1071+
errmsg("could not set environment: %m")));
10831072
}
10841073
}
10851074

‎src/backend/libpq/be-secure-gssapi.c‎

Lines changed: 10 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -525,8 +525,16 @@ secure_open_gssapi(Port *port)
525525
* Use the configured keytab, if there is one. Unfortunately, Heimdal
526526
* doesn't support the cred store extensions, so use the env var.
527527
*/
528-
if (pg_krb_server_keyfile!=NULL&&strlen(pg_krb_server_keyfile)>0)
529-
setenv("KRB5_KTNAME",pg_krb_server_keyfile,1);
528+
if (pg_krb_server_keyfile!=NULL&&pg_krb_server_keyfile[0]!='\0')
529+
{
530+
if (setenv("KRB5_KTNAME",pg_krb_server_keyfile,1)!=0)
531+
{
532+
/* The only likely failure cause is OOM, so use that errcode */
533+
ereport(FATAL,
534+
(errcode(ERRCODE_OUT_OF_MEMORY),
535+
errmsg("could not set environment: %m")));
536+
}
537+
}
530538

531539
while (true)
532540
{

‎src/backend/utils/misc/postgresql.conf.sample‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -92,7 +92,7 @@
9292
#db_user_namespace = off
9393

9494
# GSSAPI using Kerberos
95-
#krb_server_keyfile = ''
95+
#krb_server_keyfile = 'FILE:${sysconfdir}/krb5.keytab'
9696
#krb_caseins_users = off
9797

9898
# - SSL -

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