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Commitb06f1f2

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Put back ssl_renegotiation_limit parameter, but only allow 0.
Per a report from Shay Rojansky, Npgsql sends ssl_renegotiation_limit=0in the startup packet because it does not support renegotiation; otherclients which have not attempted to support renegotiation might wellbehave similarly. The recent removal of this parameter forces them tobreak compatibility with either current PostgreSQL versions, orprevious ones. Per discussion, the best solution is to accept theparameter but only allow a value of 0.Shay Rojansky, edited a little by me.
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  • src/backend/utils/misc

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‎src/backend/utils/misc/guc.c

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Original file line numberDiff line numberDiff line change
@@ -436,6 +436,14 @@ inttcp_keepalives_idle;
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inttcp_keepalives_interval;
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inttcp_keepalives_count;
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/*
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* SSL renegotiation was been removed in PostgreSQL 9.5, but we tolerate it
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* being set to zero (meaning never renegotiate) for backward compatibility.
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* This avoids breaking compatibility with clients that have never supported
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* renegotiation and therefore always try to zero it.
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*/
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intssl_renegotiation_limit;
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/*
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* This really belongs in pg_shmem.c, but is defined here so that it doesn't
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* need to be duplicated in all the different implementations of pg_shmem.c.
@@ -2570,6 +2578,17 @@ static struct config_int ConfigureNamesInt[] =
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NULL,assign_tcp_keepalives_interval,show_tcp_keepalives_interval
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},
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{
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{"ssl_renegotiation_limit",PGC_USERSET,CONN_AUTH_SECURITY,
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gettext_noop("SSL regenotiation is no longer supported; this can only be 0"),
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NULL,
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GUC_NO_SHOW_ALL |GUC_NOT_IN_SAMPLE |GUC_DISALLOW_IN_FILE,
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},
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&ssl_renegotiation_limit,
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0,0,0,
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NULL,NULL,NULL
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},
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{
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{"tcp_keepalives_count",PGC_USERSET,CLIENT_CONN_OTHER,
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gettext_noop("Maximum number of TCP keepalive retransmits."),

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