Adding upstream version 13.4.upstream/13.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

14 files changed, 1307 insertions, 0 deletions

diff --git a/src/include/libpq/auth.h b/src/include/libpq/auth.h
new file mode 100644
index 0000000..81202e6
--- /dev/null
+++ b/src/include/libpq/auth.h
@@ -0,0 +1,29 @@
+/*-------------------------------------------------------------------------
+ *
+ * auth.h
+ *	  Definitions for network authentication routines
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/auth.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef AUTH_H
+#define AUTH_H
+
+#include "libpq/libpq-be.h"
+
+extern char *pg_krb_server_keyfile;
+extern bool pg_krb_caseins_users;
+extern char *pg_krb_realm;
+
+extern void ClientAuthentication(Port *port);
+
+/* Hook for plugins to get control in ClientAuthentication() */
+typedef void (*ClientAuthentication_hook_type) (Port *, int);
+extern PGDLLIMPORT ClientAuthentication_hook_type ClientAuthentication_hook;
+
+#endif							/* AUTH_H */
diff --git a/src/include/libpq/be-fsstubs.h b/src/include/libpq/be-fsstubs.h
new file mode 100644
index 0000000..4fbd7cc
--- /dev/null
+++ b/src/include/libpq/be-fsstubs.h
@@ -0,0 +1,32 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-fsstubs.h
+ *
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/be-fsstubs.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef BE_FSSTUBS_H
+#define BE_FSSTUBS_H
+
+/*
+ * These are not fmgr-callable, but are available to C code.
+ * Probably these should have had the underscore-free names,
+ * but too late now...
+ */
+extern int	lo_read(int fd, char *buf, int len);
+extern int	lo_write(int fd, const char *buf, int len);
+
+/*
+ * Cleanup LOs at xact commit/abort
+ */
+extern void AtEOXact_LargeObject(bool isCommit);
+extern void AtEOSubXact_LargeObject(bool isCommit, SubTransactionId mySubid,
+									SubTransactionId parentSubid);
+
+#endif							/* BE_FSSTUBS_H */
diff --git a/src/include/libpq/be-gssapi-common.h b/src/include/libpq/be-gssapi-common.h
new file mode 100644
index 0000000..e1c23ac
--- /dev/null
+++ b/src/include/libpq/be-gssapi-common.h
@@ -0,0 +1,26 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-gssapi-common.h
+ *       Definitions for GSSAPI authentication and encryption handling
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/be-gssapi-common.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef BE_GSSAPI_COMMON_H
+#define BE_GSSAPI_COMMON_H
+
+#if defined(HAVE_GSSAPI_H)
+#include <gssapi.h>
+#else
+#include <gssapi/gssapi.h>
+#endif
+
+extern void pg_GSS_error(const char *errmsg,
+						 OM_uint32 maj_stat, OM_uint32 min_stat);
+
+#endif							/* BE_GSSAPI_COMMON_H */
diff --git a/src/include/libpq/crypt.h b/src/include/libpq/crypt.h
new file mode 100644
index 0000000..0c99e6c
--- /dev/null
+++ b/src/include/libpq/crypt.h
@@ -0,0 +1,46 @@
+/*-------------------------------------------------------------------------
+ *
+ * crypt.h
+ *	  Interface to libpq/crypt.c
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/crypt.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_CRYPT_H
+#define PG_CRYPT_H
+
+#include "datatype/timestamp.h"
+
+/*
+ * Types of password hashes or secrets.
+ *
+ * Plaintext passwords can be passed in by the user, in a CREATE/ALTER USER
+ * command. They will be encrypted to MD5 or SCRAM-SHA-256 format, before
+ * storing on-disk, so only MD5 and SCRAM-SHA-256 passwords should appear
+ * in pg_authid.rolpassword. They are also the allowed values for the
+ * password_encryption GUC.
+ */
+typedef enum PasswordType
+{
+	PASSWORD_TYPE_PLAINTEXT = 0,
+	PASSWORD_TYPE_MD5,
+	PASSWORD_TYPE_SCRAM_SHA_256
+} PasswordType;
+
+extern PasswordType get_password_type(const char *shadow_pass);
+extern char *encrypt_password(PasswordType target_type, const char *role,
+							  const char *password);
+
+extern char *get_role_password(const char *role, char **logdetail);
+
+extern int	md5_crypt_verify(const char *role, const char *shadow_pass,
+							 const char *client_pass, const char *md5_salt,
+							 int md5_salt_len, char **logdetail);
+extern int	plain_crypt_verify(const char *role, const char *shadow_pass,
+							   const char *client_pass, char **logdetail);
+
+#endif
diff --git a/src/include/libpq/hba.h b/src/include/libpq/hba.h
new file mode 100644
index 0000000..c194d74
--- /dev/null
+++ b/src/include/libpq/hba.h
@@ -0,0 +1,140 @@
+/*-------------------------------------------------------------------------
+ *
+ * hba.h
+ *	  Interface to hba.c
+ *
+ *
+ * src/include/libpq/hba.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef HBA_H
+#define HBA_H
+
+#include "libpq/pqcomm.h"	/* pgrminclude ignore */	/* needed for NetBSD */
+#include "nodes/pg_list.h"
+#include "regex/regex.h"
+
+
+/*
+ * The following enum represents the authentication methods that
+ * are supported by PostgreSQL.
+ *
+ * Note: keep this in sync with the UserAuthName array in hba.c.
+ */
+typedef enum UserAuth
+{
+	uaReject,
+	uaImplicitReject,			/* Not a user-visible option */
+	uaTrust,
+	uaIdent,
+	uaPassword,
+	uaMD5,
+	uaSCRAM,
+	uaGSS,
+	uaSSPI,
+	uaPAM,
+	uaBSD,
+	uaLDAP,
+	uaCert,
+	uaRADIUS,
+	uaPeer
+#define USER_AUTH_LAST uaPeer	/* Must be last value of this enum */
+} UserAuth;
+
+/*
+ * Data structures representing pg_hba.conf entries
+ */
+
+typedef enum IPCompareMethod
+{
+	ipCmpMask,
+	ipCmpSameHost,
+	ipCmpSameNet,
+	ipCmpAll
+} IPCompareMethod;
+
+typedef enum ConnType
+{
+	ctLocal,
+	ctHost,
+	ctHostSSL,
+	ctHostNoSSL,
+	ctHostGSS,
+	ctHostNoGSS,
+} ConnType;
+
+typedef enum ClientCertMode
+{
+	clientCertOff,
+	clientCertCA,
+	clientCertFull
+} ClientCertMode;
+
+typedef struct HbaLine
+{
+	int			linenumber;
+	char	   *rawline;
+	ConnType	conntype;
+	List	   *databases;
+	List	   *roles;
+	struct sockaddr_storage addr;
+	struct sockaddr_storage mask;
+	IPCompareMethod ip_cmp_method;
+	char	   *hostname;
+	UserAuth	auth_method;
+
+	char	   *usermap;
+	char	   *pamservice;
+	bool		pam_use_hostname;
+	bool		ldaptls;
+	char	   *ldapscheme;
+	char	   *ldapserver;
+	int			ldapport;
+	char	   *ldapbinddn;
+	char	   *ldapbindpasswd;
+	char	   *ldapsearchattribute;
+	char	   *ldapsearchfilter;
+	char	   *ldapbasedn;
+	int			ldapscope;
+	char	   *ldapprefix;
+	char	   *ldapsuffix;
+	ClientCertMode clientcert;
+	char	   *krb_realm;
+	bool		include_realm;
+	bool		compat_realm;
+	bool		upn_username;
+	List	   *radiusservers;
+	char	   *radiusservers_s;
+	List	   *radiussecrets;
+	char	   *radiussecrets_s;
+	List	   *radiusidentifiers;
+	char	   *radiusidentifiers_s;
+	List	   *radiusports;
+	char	   *radiusports_s;
+	int			addrlen;		/* zero if we don't have a valid addr */
+	int			masklen;		/* zero if we don't have a valid mask */
+} HbaLine;
+
+typedef struct IdentLine
+{
+	int			linenumber;
+
+	char	   *usermap;
+	char	   *ident_user;
+	char	   *pg_role;
+	regex_t		re;
+} IdentLine;
+
+/* kluge to avoid including libpq/libpq-be.h here */
+typedef struct Port hbaPort;
+
+extern bool load_hba(void);
+extern bool load_ident(void);
+extern void hba_getauthmethod(hbaPort *port);
+extern int	check_usermap(const char *usermap_name,
+						  const char *pg_role, const char *auth_user,
+						  bool case_sensitive);
+extern bool pg_isblank(const char c);
+
+#endif							/* HBA_H */
diff --git a/src/include/libpq/ifaddr.h b/src/include/libpq/ifaddr.h
new file mode 100644
index 0000000..4b61518
--- /dev/null
+++ b/src/include/libpq/ifaddr.h
@@ -0,0 +1,30 @@
+/*-------------------------------------------------------------------------
+ *
+ * ifaddr.h
+ *	  IP netmask calculations, and enumerating network interfaces.
+ *
+ * Copyright (c) 2003-2020, PostgreSQL Global Development Group
+ *
+ * src/include/libpq/ifaddr.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef IFADDR_H
+#define IFADDR_H
+
+#include "libpq/pqcomm.h"		/* pgrminclude ignore */
+
+typedef void (*PgIfAddrCallback) (struct sockaddr *addr,
+								  struct sockaddr *netmask,
+								  void *cb_data);
+
+extern int	pg_range_sockaddr(const struct sockaddr_storage *addr,
+							  const struct sockaddr_storage *netaddr,
+							  const struct sockaddr_storage *netmask);
+
+extern int	pg_sockaddr_cidr_mask(struct sockaddr_storage *mask,
+								  char *numbits, int family);
+
+extern int	pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data);
+
+#endif							/* IFADDR_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
new file mode 100644
index 0000000..fa778e1
--- /dev/null
+++ b/src/include/libpq/libpq-be.h
@@ -0,0 +1,326 @@
+/*-------------------------------------------------------------------------
+ *
+ * libpq-be.h
+ *	  This file contains definitions for structures and externs used
+ *	  by the postmaster during client authentication.
+ *
+ *	  Note that this is backend-internal and is NOT exported to clients.
+ *	  Structs that need to be client-visible are in pqcomm.h.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/libpq-be.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef LIBPQ_BE_H
+#define LIBPQ_BE_H
+
+#include <sys/time.h>
+#ifdef USE_OPENSSL
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#endif
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>
+#endif
+
+#ifdef ENABLE_GSS
+#if defined(HAVE_GSSAPI_H)
+#include <gssapi.h>
+#else
+#include <gssapi/gssapi.h>
+#endif							/* HAVE_GSSAPI_H */
+/*
+ * GSSAPI brings in headers that set a lot of things in the global namespace on win32,
+ * that doesn't match the msvc build. It gives a bunch of compiler warnings that we ignore,
+ * but also defines a symbol that simply does not exist. Undefine it again.
+ */
+#ifdef _MSC_VER
+#undef HAVE_GETADDRINFO
+#endif
+#endif							/* ENABLE_GSS */
+
+#ifdef ENABLE_SSPI
+#define SECURITY_WIN32
+#if defined(WIN32) && !defined(_MSC_VER)
+#include <ntsecapi.h>
+#endif
+#include <security.h>
+#undef SECURITY_WIN32
+
+#ifndef ENABLE_GSS
+/*
+ * Define a fake structure compatible with GSSAPI on Unix.
+ */
+typedef struct
+{
+	void	   *value;
+	int			length;
+} gss_buffer_desc;
+#endif
+#endif							/* ENABLE_SSPI */
+
+#include "datatype/timestamp.h"
+#include "libpq/hba.h"
+#include "libpq/pqcomm.h"
+
+
+typedef enum CAC_state
+{
+	CAC_OK, CAC_STARTUP, CAC_SHUTDOWN, CAC_RECOVERY, CAC_TOOMANY,
+	CAC_SUPERUSER
+} CAC_state;
+
+
+/*
+ * GSSAPI specific state information
+ */
+#if defined(ENABLE_GSS) | defined(ENABLE_SSPI)
+typedef struct
+{
+	gss_buffer_desc outbuf;		/* GSSAPI output token buffer */
+#ifdef ENABLE_GSS
+	gss_cred_id_t cred;			/* GSSAPI connection cred's */
+	gss_ctx_id_t ctx;			/* GSSAPI connection context */
+	gss_name_t	name;			/* GSSAPI client name */
+	char	   *princ;			/* GSSAPI Principal used for auth, NULL if
+								 * GSSAPI auth was not used */
+	bool		auth;			/* GSSAPI Authentication used */
+	bool		enc;			/* GSSAPI encryption in use */
+#endif
+} pg_gssinfo;
+#endif
+
+/*
+ * This is used by the postmaster in its communication with frontends.  It
+ * contains all state information needed during this communication before the
+ * backend is run.  The Port structure is kept in malloc'd memory and is
+ * still available when a backend is running (see MyProcPort).  The data
+ * it points to must also be malloc'd, or else palloc'd in TopMemoryContext,
+ * so that it survives into PostgresMain execution!
+ *
+ * remote_hostname is set if we did a successful reverse lookup of the
+ * client's IP address during connection setup.
+ * remote_hostname_resolv tracks the state of hostname verification:
+ *	+1 = remote_hostname is known to resolve to client's IP address
+ *	-1 = remote_hostname is known NOT to resolve to client's IP address
+ *	 0 = we have not done the forward DNS lookup yet
+ *	-2 = there was an error in name resolution
+ * If reverse lookup of the client IP address fails, remote_hostname will be
+ * left NULL while remote_hostname_resolv is set to -2.  If reverse lookup
+ * succeeds but forward lookup fails, remote_hostname_resolv is also set to -2
+ * (the case is distinguishable because remote_hostname isn't NULL).  In
+ * either of the -2 cases, remote_hostname_errcode saves the lookup return
+ * code for possible later use with gai_strerror.
+ */
+
+typedef struct Port
+{
+	pgsocket	sock;			/* File descriptor */
+	bool		noblock;		/* is the socket in non-blocking mode? */
+	ProtocolVersion proto;		/* FE/BE protocol version */
+	SockAddr	laddr;			/* local addr (postmaster) */
+	SockAddr	raddr;			/* remote addr (client) */
+	char	   *remote_host;	/* name (or ip addr) of remote host */
+	char	   *remote_hostname;	/* name (not ip addr) of remote host, if
+									 * available */
+	int			remote_hostname_resolv; /* see above */
+	int			remote_hostname_errcode;	/* see above */
+	char	   *remote_port;	/* text rep of remote port */
+	CAC_state	canAcceptConnections;	/* postmaster connection status */
+
+	/*
+	 * Information that needs to be saved from the startup packet and passed
+	 * into backend execution.  "char *" fields are NULL if not set.
+	 * guc_options points to a List of alternating option names and values.
+	 */
+	char	   *database_name;
+	char	   *user_name;
+	char	   *cmdline_options;
+	List	   *guc_options;
+
+	/*
+	 * The startup packet application name, only used here for the "connection
+	 * authorized" log message. We shouldn't use this post-startup, instead
+	 * the GUC should be used as application can change it afterward.
+	 */
+	char	   *application_name;
+
+	/*
+	 * Information that needs to be held during the authentication cycle.
+	 */
+	HbaLine    *hba;
+
+	/*
+	 * TCP keepalive and user timeout settings.
+	 *
+	 * default values are 0 if AF_UNIX or not yet known; current values are 0
+	 * if AF_UNIX or using the default. Also, -1 in a default value means we
+	 * were unable to find out the default (getsockopt failed).
+	 */
+	int			default_keepalives_idle;
+	int			default_keepalives_interval;
+	int			default_keepalives_count;
+	int			default_tcp_user_timeout;
+	int			keepalives_idle;
+	int			keepalives_interval;
+	int			keepalives_count;
+	int			tcp_user_timeout;
+
+	/*
+	 * GSSAPI structures.
+	 */
+#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
+
+	/*
+	 * If GSSAPI is supported and used on this connection, store GSSAPI
+	 * information.  Even when GSSAPI is not compiled in, store a NULL pointer
+	 * to keep struct offsets the same (for extension ABI compatibility).
+	 */
+	pg_gssinfo *gss;
+#else
+	void	   *gss;
+#endif
+
+	/*
+	 * SSL structures.
+	 */
+	bool		ssl_in_use;
+	char	   *peer_cn;
+	bool		peer_cert_valid;
+
+	/*
+	 * OpenSSL structures. (Keep these last so that the locations of other
+	 * fields are the same whether or not you build with OpenSSL.)
+	 */
+#ifdef USE_OPENSSL
+	SSL		   *ssl;
+	X509	   *peer;
+#endif
+} Port;
+
+#ifdef USE_SSL
+/*
+ *	Hardcoded DH parameters, used in ephemeral DH keying.  (See also
+ *	README.SSL for more details on EDH.)
+ *
+ *	This is the 2048-bit DH parameter from RFC 3526.  The generation of the
+ *	prime is specified in RFC 2412 Appendix E, which also discusses the
+ *	design choice of the generator.  Note that when loaded with OpenSSL
+ *	this causes DH_check() to fail on DH_NOT_SUITABLE_GENERATOR, where
+ *	leaking a bit is preferred.
+ */
+#define FILE_DH2048 \
+"-----BEGIN DH PARAMETERS-----\n\
+MIIBCAKCAQEA///////////JD9qiIWjCNMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n\
+IlFKCHmONATd75UZs806QxswKwpt8l8UN0/hNW1tUcJF5IW1dmJefsb0TELppjft\n\
+awv/XLb0Brft7jhr+1qJn6WunyQRfEsf5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n\
+mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVSu57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n\
+fDKQXkYuNs474553LBgOhgObJ4Oi7Aeij7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n\
+5RXSJhiY+gUQFXKOWoqsqmj//////////wIBAg==\n\
+-----END DH PARAMETERS-----\n"
+
+/*
+ * These functions are implemented by the glue code specific to each
+ * SSL implementation (e.g. be-secure-openssl.c)
+ */
+
+/*
+ * Initialize global SSL context.
+ *
+ * If isServerStart is true, report any errors as FATAL (so we don't return).
+ * Otherwise, log errors at LOG level and return -1 to indicate trouble,
+ * preserving the old SSL state if any.  Returns 0 if OK.
+ */
+extern int	be_tls_init(bool isServerStart);
+
+/*
+ * Destroy global SSL context, if any.
+ */
+extern void be_tls_destroy(void);
+
+/*
+ * Attempt to negotiate SSL connection.
+ */
+extern int	be_tls_open_server(Port *port);
+
+/*
+ * Close SSL connection.
+ */
+extern void be_tls_close(Port *port);
+
+/*
+ * Read data from a secure connection.
+ */
+extern ssize_t be_tls_read(Port *port, void *ptr, size_t len, int *waitfor);
+
+/*
+ * Write data to a secure connection.
+ */
+extern ssize_t be_tls_write(Port *port, void *ptr, size_t len, int *waitfor);
+
+/*
+ * Return information about the SSL connection.
+ */
+extern int	be_tls_get_cipher_bits(Port *port);
+extern bool be_tls_get_compression(Port *port);
+extern const char *be_tls_get_version(Port *port);
+extern const char *be_tls_get_cipher(Port *port);
+extern void be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len);
+extern void be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len);
+extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
+
+/*
+ * Get the server certificate hash for SCRAM channel binding type
+ * tls-server-end-point.
+ *
+ * The result is a palloc'd hash of the server certificate with its
+ * size, and NULL if there is no certificate available.
+ *
+ * This is not supported with old versions of OpenSSL that don't have
+ * the X509_get_signature_nid() function.
+ */
+#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#define HAVE_BE_TLS_GET_CERTIFICATE_HASH
+extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
+#endif
+
+/* init hook for SSL, the default sets the password callback if appropriate */
+#ifdef USE_OPENSSL
+typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
+extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
+#endif
+
+#endif							/* USE_SSL */
+
+#ifdef ENABLE_GSS
+/*
+ * Return information about the GSSAPI authenticated connection
+ */
+extern bool be_gssapi_get_auth(Port *port);
+extern bool be_gssapi_get_enc(Port *port);
+extern const char *be_gssapi_get_princ(Port *port);
+
+/* Read and write to a GSSAPI-encrypted connection. */
+extern ssize_t be_gssapi_read(Port *port, void *ptr, size_t len);
+extern ssize_t be_gssapi_write(Port *port, void *ptr, size_t len);
+#endif							/* ENABLE_GSS */
+
+extern ProtocolVersion FrontendProtocol;
+
+/* TCP keepalives configuration. These are no-ops on an AF_UNIX socket. */
+
+extern int	pq_getkeepalivesidle(Port *port);
+extern int	pq_getkeepalivesinterval(Port *port);
+extern int	pq_getkeepalivescount(Port *port);
+extern int	pq_gettcpusertimeout(Port *port);
+
+extern int	pq_setkeepalivesidle(int idle, Port *port);
+extern int	pq_setkeepalivesinterval(int interval, Port *port);
+extern int	pq_setkeepalivescount(int count, Port *port);
+extern int	pq_settcpusertimeout(int timeout, Port *port);
+
+#endif							/* LIBPQ_BE_H */
diff --git a/src/include/libpq/libpq-fs.h b/src/include/libpq/libpq-fs.h
new file mode 100644
index 0000000..a3c2cd9
--- /dev/null
+++ b/src/include/libpq/libpq-fs.h
@@ -0,0 +1,24 @@
+/*-------------------------------------------------------------------------
+ *
+ * libpq-fs.h
+ *	  definitions for using Inversion file system routines (ie, large objects)
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/libpq-fs.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef LIBPQ_FS_H
+#define LIBPQ_FS_H
+
+/*
+ *	Read/write mode flags for inversion (large object) calls
+ */
+
+#define INV_WRITE		0x00020000
+#define INV_READ		0x00040000
+
+#endif							/* LIBPQ_FS_H */
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
new file mode 100644
index 0000000..b115247
--- /dev/null
+++ b/src/include/libpq/libpq.h
@@ -0,0 +1,133 @@
+/*-------------------------------------------------------------------------
+ *
+ * libpq.h
+ *	  POSTGRES LIBPQ buffer structure definitions.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/libpq.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef LIBPQ_H
+#define LIBPQ_H
+
+#include <netinet/in.h>
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq-be.h"
+#include "storage/latch.h"
+
+
+typedef struct
+{
+	void		(*comm_reset) (void);
+	int			(*flush) (void);
+	int			(*flush_if_writable) (void);
+	bool		(*is_send_pending) (void);
+	int			(*putmessage) (char msgtype, const char *s, size_t len);
+	void		(*putmessage_noblock) (char msgtype, const char *s, size_t len);
+	void		(*startcopyout) (void);
+	void		(*endcopyout) (bool errorAbort);
+} PQcommMethods;
+
+extern const PGDLLIMPORT PQcommMethods *PqCommMethods;
+
+#define pq_comm_reset() (PqCommMethods->comm_reset())
+#define pq_flush() (PqCommMethods->flush())
+#define pq_flush_if_writable() (PqCommMethods->flush_if_writable())
+#define pq_is_send_pending() (PqCommMethods->is_send_pending())
+#define pq_putmessage(msgtype, s, len) \
+	(PqCommMethods->putmessage(msgtype, s, len))
+#define pq_putmessage_noblock(msgtype, s, len) \
+	(PqCommMethods->putmessage_noblock(msgtype, s, len))
+#define pq_startcopyout() (PqCommMethods->startcopyout())
+#define pq_endcopyout(errorAbort) (PqCommMethods->endcopyout(errorAbort))
+
+/*
+ * External functions.
+ */
+
+/*
+ * prototypes for functions in pqcomm.c
+ */
+extern WaitEventSet *FeBeWaitSet;
+
+extern int	StreamServerPort(int family, const char *hostName,
+							 unsigned short portNumber, const char *unixSocketDir,
+							 pgsocket ListenSocket[], int MaxListen);
+extern int	StreamConnection(pgsocket server_fd, Port *port);
+extern void StreamClose(pgsocket sock);
+extern void TouchSocketFiles(void);
+extern void RemoveSocketFiles(void);
+extern void pq_init(void);
+extern int	pq_getbytes(char *s, size_t len);
+extern int	pq_getstring(StringInfo s);
+extern void pq_startmsgread(void);
+extern void pq_endmsgread(void);
+extern bool pq_is_reading_msg(void);
+extern int	pq_getmessage(StringInfo s, int maxlen);
+extern int	pq_getbyte(void);
+extern int	pq_peekbyte(void);
+extern int	pq_getbyte_if_available(unsigned char *c);
+extern int	pq_putbytes(const char *s, size_t len);
+
+/*
+ * prototypes for functions in be-secure.c
+ */
+extern char *ssl_library;
+extern char *ssl_cert_file;
+extern char *ssl_key_file;
+extern char *ssl_ca_file;
+extern char *ssl_crl_file;
+extern char *ssl_dh_params_file;
+extern PGDLLIMPORT char *ssl_passphrase_command;
+extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
+#ifdef USE_SSL
+extern bool ssl_loaded_verify_locations;
+#endif
+
+extern int	secure_initialize(bool isServerStart);
+extern bool secure_loaded_verify_locations(void);
+extern void secure_destroy(void);
+extern int	secure_open_server(Port *port);
+extern void secure_close(Port *port);
+extern ssize_t secure_read(Port *port, void *ptr, size_t len);
+extern ssize_t secure_write(Port *port, void *ptr, size_t len);
+extern ssize_t secure_raw_read(Port *port, void *ptr, size_t len);
+extern ssize_t secure_raw_write(Port *port, const void *ptr, size_t len);
+
+/*
+ * prototypes for functions in be-secure-gssapi.c
+ */
+#ifdef ENABLE_GSS
+extern ssize_t secure_open_gssapi(Port *port);
+#endif
+
+/* GUCs */
+extern char *SSLCipherSuites;
+extern char *SSLECDHCurve;
+extern bool SSLPreferServerCiphers;
+extern int	ssl_min_protocol_version;
+extern int	ssl_max_protocol_version;
+
+enum ssl_protocol_versions
+{
+	PG_TLS_ANY = 0,
+	PG_TLS1_VERSION,
+	PG_TLS1_1_VERSION,
+	PG_TLS1_2_VERSION,
+	PG_TLS1_3_VERSION,
+};
+
+/*
+ * prototypes for functions in be-secure-common.c
+ */
+extern int	run_ssl_passphrase_command(const char *prompt, bool is_server_start,
+									   char *buf, int size);
+extern bool check_ssl_key_file_permissions(const char *ssl_key_file,
+										   bool isServerStart);
+
+#endif							/* LIBPQ_H */
diff --git a/src/include/libpq/pqcomm.h b/src/include/libpq/pqcomm.h
new file mode 100644
index 0000000..781d86c
--- /dev/null
+++ b/src/include/libpq/pqcomm.h
@@ -0,0 +1,208 @@
+/*-------------------------------------------------------------------------
+ *
+ * pqcomm.h
+ *		Definitions common to frontends and backends.
+ *
+ * NOTE: for historical reasons, this does not correspond to pqcomm.c.
+ * pqcomm.c's routines are declared in libpq.h.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/pqcomm.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PQCOMM_H
+#define PQCOMM_H
+
+#include <sys/socket.h>
+#include <netdb.h>
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#include <netinet/in.h>
+
+#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
+
+#ifndef HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY
+#ifdef HAVE_STRUCT_SOCKADDR_STORAGE___SS_FAMILY
+#define ss_family __ss_family
+#else
+#error struct sockaddr_storage does not provide an ss_family member
+#endif
+#endif
+
+#ifdef HAVE_STRUCT_SOCKADDR_STORAGE___SS_LEN
+#define ss_len __ss_len
+#define HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN 1
+#endif
+#else							/* !HAVE_STRUCT_SOCKADDR_STORAGE */
+
+/* Define a struct sockaddr_storage if we don't have one. */
+
+struct sockaddr_storage
+{
+	union
+	{
+		struct sockaddr sa;		/* get the system-dependent fields */
+		int64		ss_align;	/* ensures struct is properly aligned */
+		char		ss_pad[128];	/* ensures struct has desired size */
+	}			ss_stuff;
+};
+
+#define ss_family	ss_stuff.sa.sa_family
+/* It should have an ss_len field if sockaddr has sa_len. */
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+#define ss_len		ss_stuff.sa.sa_len
+#define HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN 1
+#endif
+#endif							/* HAVE_STRUCT_SOCKADDR_STORAGE */
+
+typedef struct
+{
+	struct sockaddr_storage addr;
+	ACCEPT_TYPE_ARG3 salen;
+} SockAddr;
+
+/* Configure the UNIX socket location for the well known port. */
+
+#define UNIXSOCK_PATH(path, port, sockdir) \
+	   (AssertMacro(sockdir), \
+		AssertMacro(*(sockdir) != '\0'), \
+		snprintf(path, sizeof(path), "%s/.s.PGSQL.%d", \
+				 (sockdir), (port)))
+
+/*
+ * The maximum workable length of a socket path is what will fit into
+ * struct sockaddr_un.  This is usually only 100 or so bytes :-(.
+ *
+ * For consistency, always pass a MAXPGPATH-sized buffer to UNIXSOCK_PATH(),
+ * then complain if the resulting string is >= UNIXSOCK_PATH_BUFLEN bytes.
+ * (Because the standard API for getaddrinfo doesn't allow it to complain in
+ * a useful way when the socket pathname is too long, we have to test for
+ * this explicitly, instead of just letting the subroutine return an error.)
+ */
+#define UNIXSOCK_PATH_BUFLEN sizeof(((struct sockaddr_un *) NULL)->sun_path)
+
+
+/*
+ * These manipulate the frontend/backend protocol version number.
+ *
+ * The major number should be incremented for incompatible changes.  The minor
+ * number should be incremented for compatible changes (eg. additional
+ * functionality).
+ *
+ * If a backend supports version m.n of the protocol it must actually support
+ * versions m.[0..n].  Backend support for version m-1 can be dropped after a
+ * `reasonable' length of time.
+ *
+ * A frontend isn't required to support anything other than the current
+ * version.
+ */
+
+#define PG_PROTOCOL_MAJOR(v)	((v) >> 16)
+#define PG_PROTOCOL_MINOR(v)	((v) & 0x0000ffff)
+#define PG_PROTOCOL(m,n)	(((m) << 16) | (n))
+
+/* The earliest and latest frontend/backend protocol version supported. */
+
+#define PG_PROTOCOL_EARLIEST	PG_PROTOCOL(2,0)
+#define PG_PROTOCOL_LATEST		PG_PROTOCOL(3,0)
+
+typedef uint32 ProtocolVersion; /* FE/BE protocol version number */
+
+typedef ProtocolVersion MsgType;
+
+
+/*
+ * Packet lengths are 4 bytes in network byte order.
+ *
+ * The initial length is omitted from the packet layouts appearing below.
+ */
+
+typedef uint32 PacketLen;
+
+
+/*
+ * Old-style startup packet layout with fixed-width fields.  This is used in
+ * protocol 1.0 and 2.0, but not in later versions.  Note that the fields
+ * in this layout are '\0' terminated only if there is room.
+ */
+
+#define SM_DATABASE		64
+#define SM_USER			32
+/* We append database name if db_user_namespace true. */
+#define SM_DATABASE_USER (SM_DATABASE+SM_USER+1)	/* +1 for @ */
+#define SM_OPTIONS		64
+#define SM_UNUSED		64
+#define SM_TTY			64
+
+typedef struct StartupPacket
+{
+	ProtocolVersion protoVersion;	/* Protocol version */
+	char		database[SM_DATABASE];	/* Database name */
+	/* Db_user_namespace appends dbname */
+	char		user[SM_USER];	/* User name */
+	char		options[SM_OPTIONS];	/* Optional additional args */
+	char		unused[SM_UNUSED];	/* Unused */
+	char		tty[SM_TTY];	/* Tty for debug output */
+} StartupPacket;
+
+extern bool Db_user_namespace;
+
+/*
+ * In protocol 3.0 and later, the startup packet length is not fixed, but
+ * we set an arbitrary limit on it anyway.  This is just to prevent simple
+ * denial-of-service attacks via sending enough data to run the server
+ * out of memory.
+ */
+#define MAX_STARTUP_PACKET_LENGTH 10000
+
+
+/* These are the authentication request codes sent by the backend. */
+
+#define AUTH_REQ_OK			0	/* User is authenticated  */
+#define AUTH_REQ_KRB4		1	/* Kerberos V4. Not supported any more. */
+#define AUTH_REQ_KRB5		2	/* Kerberos V5. Not supported any more. */
+#define AUTH_REQ_PASSWORD	3	/* Password */
+#define AUTH_REQ_CRYPT		4	/* crypt password. Not supported any more. */
+#define AUTH_REQ_MD5		5	/* md5 password */
+#define AUTH_REQ_SCM_CREDS	6	/* transfer SCM credentials */
+#define AUTH_REQ_GSS		7	/* GSSAPI without wrap() */
+#define AUTH_REQ_GSS_CONT	8	/* Continue GSS exchanges */
+#define AUTH_REQ_SSPI		9	/* SSPI negotiate without wrap() */
+#define AUTH_REQ_SASL	   10	/* Begin SASL authentication */
+#define AUTH_REQ_SASL_CONT 11	/* Continue SASL authentication */
+#define AUTH_REQ_SASL_FIN  12	/* Final SASL message */
+
+typedef uint32 AuthRequest;
+
+
+/*
+ * A client can also send a cancel-current-operation request to the postmaster.
+ * This is uglier than sending it directly to the client's backend, but it
+ * avoids depending on out-of-band communication facilities.
+ *
+ * The cancel request code must not match any protocol version number
+ * we're ever likely to use.  This random choice should do.
+ */
+#define CANCEL_REQUEST_CODE PG_PROTOCOL(1234,5678)
+
+typedef struct CancelRequestPacket
+{
+	/* Note that each field is stored in network byte order! */
+	MsgType		cancelRequestCode;	/* code to identify a cancel request */
+	uint32		backendPID;		/* PID of client's backend */
+	uint32		cancelAuthCode; /* secret key to authorize cancel */
+} CancelRequestPacket;
+
+
+/*
+ * A client can also start by sending a SSL or GSSAPI negotiation request to
+ * get a secure channel.
+ */
+#define NEGOTIATE_SSL_CODE PG_PROTOCOL(1234,5679)
+#define NEGOTIATE_GSS_CODE PG_PROTOCOL(1234,5680)
+
+#endif							/* PQCOMM_H */
diff --git a/src/include/libpq/pqformat.h b/src/include/libpq/pqformat.h
new file mode 100644
index 0000000..af31e9c
--- /dev/null
+++ b/src/include/libpq/pqformat.h
@@ -0,0 +1,210 @@
+/*-------------------------------------------------------------------------
+ *
+ * pqformat.h
+ *		Definitions for formatting and parsing frontend/backend messages
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/pqformat.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PQFORMAT_H
+#define PQFORMAT_H
+
+#include "lib/stringinfo.h"
+#include "mb/pg_wchar.h"
+#include "port/pg_bswap.h"
+
+extern void pq_beginmessage(StringInfo buf, char msgtype);
+extern void pq_beginmessage_reuse(StringInfo buf, char msgtype);
+extern void pq_endmessage(StringInfo buf);
+extern void pq_endmessage_reuse(StringInfo buf);
+
+extern void pq_sendbytes(StringInfo buf, const char *data, int datalen);
+extern void pq_sendcountedtext(StringInfo buf, const char *str, int slen,
+							   bool countincludesself);
+extern void pq_sendtext(StringInfo buf, const char *str, int slen);
+extern void pq_sendstring(StringInfo buf, const char *str);
+extern void pq_send_ascii_string(StringInfo buf, const char *str);
+extern void pq_sendfloat4(StringInfo buf, float4 f);
+extern void pq_sendfloat8(StringInfo buf, float8 f);
+
+/*
+ * Append a [u]int8 to a StringInfo buffer, which already has enough space
+ * preallocated.
+ *
+ * The use of pg_restrict allows the compiler to optimize the code based on
+ * the assumption that buf, buf->len, buf->data and *buf->data don't
+ * overlap. Without the annotation buf->len etc cannot be kept in a register
+ * over subsequent pq_writeintN calls.
+ *
+ * The use of StringInfoData * rather than StringInfo is due to MSVC being
+ * overly picky and demanding a * before a restrict.
+ */
+static inline void
+pq_writeint8(StringInfoData *pg_restrict buf, uint8 i)
+{
+	uint8		ni = i;
+
+	Assert(buf->len + (int) sizeof(uint8) <= buf->maxlen);
+	memcpy((char *pg_restrict) (buf->data + buf->len), &ni, sizeof(uint8));
+	buf->len += sizeof(uint8);
+}
+
+/*
+ * Append a [u]int16 to a StringInfo buffer, which already has enough space
+ * preallocated.
+ */
+static inline void
+pq_writeint16(StringInfoData *pg_restrict buf, uint16 i)
+{
+	uint16		ni = pg_hton16(i);
+
+	Assert(buf->len + (int) sizeof(uint16) <= buf->maxlen);
+	memcpy((char *pg_restrict) (buf->data + buf->len), &ni, sizeof(uint16));
+	buf->len += sizeof(uint16);
+}
+
+/*
+ * Append a [u]int32 to a StringInfo buffer, which already has enough space
+ * preallocated.
+ */
+static inline void
+pq_writeint32(StringInfoData *pg_restrict buf, uint32 i)
+{
+	uint32		ni = pg_hton32(i);
+
+	Assert(buf->len + (int) sizeof(uint32) <= buf->maxlen);
+	memcpy((char *pg_restrict) (buf->data + buf->len), &ni, sizeof(uint32));
+	buf->len += sizeof(uint32);
+}
+
+/*
+ * Append a [u]int64 to a StringInfo buffer, which already has enough space
+ * preallocated.
+ */
+static inline void
+pq_writeint64(StringInfoData *pg_restrict buf, uint64 i)
+{
+	uint64		ni = pg_hton64(i);
+
+	Assert(buf->len + (int) sizeof(uint64) <= buf->maxlen);
+	memcpy((char *pg_restrict) (buf->data + buf->len), &ni, sizeof(uint64));
+	buf->len += sizeof(uint64);
+}
+
+/*
+ * Append a null-terminated text string (with conversion) to a buffer with
+ * preallocated space.
+ *
+ * NB: The pre-allocated space needs to be sufficient for the string after
+ * converting to client encoding.
+ *
+ * NB: passed text string must be null-terminated, and so is the data
+ * sent to the frontend.
+ */
+static inline void
+pq_writestring(StringInfoData *pg_restrict buf, const char *pg_restrict str)
+{
+	int			slen = strlen(str);
+	char	   *p;
+
+	p = pg_server_to_client(str, slen);
+	if (p != str)				/* actual conversion has been done? */
+		slen = strlen(p);
+
+	Assert(buf->len + slen + 1 <= buf->maxlen);
+
+	memcpy(((char *pg_restrict) buf->data + buf->len), p, slen + 1);
+	buf->len += slen + 1;
+
+	if (p != str)
+		pfree(p);
+}
+
+/* append a binary [u]int8 to a StringInfo buffer */
+static inline void
+pq_sendint8(StringInfo buf, uint8 i)
+{
+	enlargeStringInfo(buf, sizeof(uint8));
+	pq_writeint8(buf, i);
+}
+
+/* append a binary [u]int16 to a StringInfo buffer */
+static inline void
+pq_sendint16(StringInfo buf, uint16 i)
+{
+	enlargeStringInfo(buf, sizeof(uint16));
+	pq_writeint16(buf, i);
+}
+
+/* append a binary [u]int32 to a StringInfo buffer */
+static inline void
+pq_sendint32(StringInfo buf, uint32 i)
+{
+	enlargeStringInfo(buf, sizeof(uint32));
+	pq_writeint32(buf, i);
+}
+
+/* append a binary [u]int64 to a StringInfo buffer */
+static inline void
+pq_sendint64(StringInfo buf, uint64 i)
+{
+	enlargeStringInfo(buf, sizeof(uint64));
+	pq_writeint64(buf, i);
+}
+
+/* append a binary byte to a StringInfo buffer */
+static inline void
+pq_sendbyte(StringInfo buf, uint8 byt)
+{
+	pq_sendint8(buf, byt);
+}
+
+/*
+ * Append a binary integer to a StringInfo buffer
+ *
+ * This function is deprecated; prefer use of the functions above.
+ */
+static inline void
+pq_sendint(StringInfo buf, uint32 i, int b)
+{
+	switch (b)
+	{
+		case 1:
+			pq_sendint8(buf, (uint8) i);
+			break;
+		case 2:
+			pq_sendint16(buf, (uint16) i);
+			break;
+		case 4:
+			pq_sendint32(buf, (uint32) i);
+			break;
+		default:
+			elog(ERROR, "unsupported integer size %d", b);
+			break;
+	}
+}
+
+
+extern void pq_begintypsend(StringInfo buf);
+extern bytea *pq_endtypsend(StringInfo buf);
+
+extern void pq_puttextmessage(char msgtype, const char *str);
+extern void pq_putemptymessage(char msgtype);
+
+extern int	pq_getmsgbyte(StringInfo msg);
+extern unsigned int pq_getmsgint(StringInfo msg, int b);
+extern int64 pq_getmsgint64(StringInfo msg);
+extern float4 pq_getmsgfloat4(StringInfo msg);
+extern float8 pq_getmsgfloat8(StringInfo msg);
+extern const char *pq_getmsgbytes(StringInfo msg, int datalen);
+extern void pq_copymsgbytes(StringInfo msg, char *buf, int datalen);
+extern char *pq_getmsgtext(StringInfo msg, int rawbytes, int *nbytes);
+extern const char *pq_getmsgstring(StringInfo msg);
+extern const char *pq_getmsgrawstring(StringInfo msg);
+extern void pq_getmsgend(StringInfo msg);
+
+#endif							/* PQFORMAT_H */
diff --git a/src/include/libpq/pqmq.h b/src/include/libpq/pqmq.h
new file mode 100644
index 0000000..6a3ccba
--- /dev/null
+++ b/src/include/libpq/pqmq.h
@@ -0,0 +1,24 @@
+/*-------------------------------------------------------------------------
+ *
+ * pqmq.h
+ *	  Use the frontend/backend protocol for communication over a shm_mq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/pqmq.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PQMQ_H
+#define PQMQ_H
+
+#include "lib/stringinfo.h"
+#include "storage/shm_mq.h"
+
+extern void pq_redirect_to_shm_mq(dsm_segment *seg, shm_mq_handle *mqh);
+extern void pq_set_parallel_master(pid_t pid, BackendId backend_id);
+
+extern void pq_parse_errornotice(StringInfo str, ErrorData *edata);
+
+#endif							/* PQMQ_H */
diff --git a/src/include/libpq/pqsignal.h b/src/include/libpq/pqsignal.h
new file mode 100644
index 0000000..695c4dc
--- /dev/null
+++ b/src/include/libpq/pqsignal.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * pqsignal.h
+ *	  Backend signal(2) support (see also src/port/pqsignal.c)
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/pqsignal.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PQSIGNAL_H
+#define PQSIGNAL_H
+
+#include <signal.h>
+
+#ifndef WIN32
+#define PG_SETMASK(mask)	sigprocmask(SIG_SETMASK, mask, NULL)
+#else
+/* Emulate POSIX sigset_t APIs on Windows */
+typedef int sigset_t;
+
+extern int	pqsigsetmask(int mask);
+
+#define PG_SETMASK(mask)		pqsigsetmask(*(mask))
+#define sigemptyset(set)		(*(set) = 0)
+#define sigfillset(set)			(*(set) = ~0)
+#define sigaddset(set, signum)	(*(set) |= (sigmask(signum)))
+#define sigdelset(set, signum)	(*(set) &= ~(sigmask(signum)))
+#endif							/* WIN32 */
+
+extern sigset_t UnBlockSig,
+			BlockSig,
+			StartupBlockSig;
+
+extern void pqinitmask(void);
+
+/* pqsigfunc is declared in src/include/port.h */
+extern pqsigfunc pqsignal_pm(int signo, pqsigfunc func);
+
+#endif							/* PQSIGNAL_H */
diff --git a/src/include/libpq/scram.h b/src/include/libpq/scram.h
new file mode 100644
index 0000000..83f1bbc
--- /dev/null
+++ b/src/include/libpq/scram.h
@@ -0,0 +1,37 @@
+/*-------------------------------------------------------------------------
+ *
+ * scram.h
+ *	  Interface to libpq/scram.c
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/libpq/scram.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_SCRAM_H
+#define PG_SCRAM_H
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq-be.h"
+
+/* Status codes for message exchange */
+#define SASL_EXCHANGE_CONTINUE		0
+#define SASL_EXCHANGE_SUCCESS		1
+#define SASL_EXCHANGE_FAILURE		2
+
+/* Routines dedicated to authentication */
+extern void pg_be_scram_get_mechanisms(Port *port, StringInfo buf);
+extern void *pg_be_scram_init(Port *port, const char *selected_mech, const char *shadow_pass);
+extern int	pg_be_scram_exchange(void *opaq, const char *input, int inputlen,
+								 char **output, int *outputlen, char **logdetail);
+
+/* Routines to handle and check SCRAM-SHA-256 secret */
+extern char *pg_be_scram_build_secret(const char *password);
+extern bool parse_scram_secret(const char *secret, int *iterations, char **salt,
+							   uint8 *stored_key, uint8 *server_key);
+extern bool scram_verify_plain_password(const char *username,
+										const char *password, const char *secret);
+
+#endif							/* PG_SCRAM_H */