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authorAndres Freund2025-02-10 15:03:37 +0000
committerAndres Freund2025-02-10 15:03:37 +0000
commit3e98c8ce50e46d58b91bf3ea806e995296dc5b91 (patch)
tree4d7ed8b78f036de2a857c1d13134e0afc6ce22ff
parent4dc28963533704fc7dd922b9447467466a233d89 (diff)
Specify the encoding of input to fmtId()
This commit adds fmtIdEnc() and fmtQualifiedIdEnc(), which allow to specify the encoding as an explicit argument. Additionally setFmtEncoding() is provided, which defines the encoding when no explicit encoding is provided, to avoid breaking all code using fmtId(). All users of fmtId()/fmtQualifiedId() are either converted to the explicit version or a call to setFmtEncoding() has been added. This commit does not yet utilize the now well-defined encoding, that will happen in a subsequent commit. Reviewed-by: Noah Misch <[email protected]> Reviewed-by: Tom Lane <[email protected]> Backpatch-through: 13 Security: CVE-2025-1094
-rw-r--r--src/bin/pg_dump/pg_backup_archiver.c1
-rw-r--r--src/bin/pg_dump/pg_dump.c1
-rw-r--r--src/bin/pg_dump/pg_dumpall.c1
-rw-r--r--src/bin/psql/command.c3
-rw-r--r--src/bin/scripts/common.c5
-rw-r--r--src/bin/scripts/createdb.c2
-rw-r--r--src/bin/scripts/createuser.c2
-rw-r--r--src/bin/scripts/dropdb.c13
-rw-r--r--src/bin/scripts/dropuser.c3
-rw-r--r--src/bin/scripts/reindexdb.c16
-rw-r--r--src/bin/scripts/vacuumdb.c5
-rw-r--r--src/fe_utils/string_utils.c84
-rw-r--r--src/include/fe_utils/string_utils.h3
13 files changed, 115 insertions, 24 deletions
diff --git a/src/bin/pg_dump/pg_backup_archiver.c b/src/bin/pg_dump/pg_backup_archiver.c
index 707a3fc844..b9d7ab98c3 100644
--- a/src/bin/pg_dump/pg_backup_archiver.c
+++ b/src/bin/pg_dump/pg_backup_archiver.c
@@ -2822,6 +2822,7 @@ processEncodingEntry(ArchiveHandle *AH, TocEntry *te)
pg_fatal("unrecognized encoding \"%s\"",
ptr1);
AH->public.encoding = encoding;
+ setFmtEncoding(encoding);
}
else
pg_fatal("invalid ENCODING item: %s",
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 520e1338c2..ca15b40939 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -1281,6 +1281,7 @@ setup_connection(Archive *AH, const char *dumpencoding,
* we know how to escape strings.
*/
AH->encoding = PQclientEncoding(conn);
+ setFmtEncoding(AH->encoding);
std_strings = PQparameterStatus(conn, "standard_conforming_strings");
AH->std_strings = (std_strings && strcmp(std_strings, "on") == 0);
diff --git a/src/bin/pg_dump/pg_dumpall.c b/src/bin/pg_dump/pg_dumpall.c
index 396f79781c..64a60a2609 100644
--- a/src/bin/pg_dump/pg_dumpall.c
+++ b/src/bin/pg_dump/pg_dumpall.c
@@ -524,6 +524,7 @@ main(int argc, char *argv[])
* we know how to escape strings.
*/
encoding = PQclientEncoding(conn);
+ setFmtEncoding(encoding);
std_strings = PQparameterStatus(conn, "standard_conforming_strings");
if (!std_strings)
std_strings = "off";
diff --git a/src/bin/psql/command.c b/src/bin/psql/command.c
index 6c75c8da6d..26dfdde195 100644
--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -1450,6 +1450,7 @@ exec_command_encoding(PsqlScanState scan_state, bool active_branch)
/* save encoding info into psql internal data */
pset.encoding = PQclientEncoding(pset.db);
pset.popt.topt.encoding = pset.encoding;
+ setFmtEncoding(pset.encoding);
SetVariable(pset.vars, "ENCODING",
pg_encoding_to_char(pset.encoding));
}
@@ -4135,6 +4136,8 @@ SyncVariables(void)
pset.popt.topt.encoding = pset.encoding;
pset.sversion = PQserverVersion(pset.db);
+ setFmtEncoding(pset.encoding);
+
SetVariable(pset.vars, "DBNAME", PQdb(pset.db));
SetVariable(pset.vars, "SERVICE", PQservice(pset.db));
SetVariable(pset.vars, "USER", PQuser(pset.db));
diff --git a/src/bin/scripts/common.c b/src/bin/scripts/common.c
index 343e8618a5..7b8f7d4c52 100644
--- a/src/bin/scripts/common.c
+++ b/src/bin/scripts/common.c
@@ -111,8 +111,9 @@ appendQualifiedRelation(PQExpBuffer buf, const char *spec,
exit(1);
}
appendPQExpBufferStr(buf,
- fmtQualifiedId(PQgetvalue(res, 0, 1),
- PQgetvalue(res, 0, 0)));
+ fmtQualifiedIdEnc(PQgetvalue(res, 0, 1),
+ PQgetvalue(res, 0, 0),
+ PQclientEncoding(conn)));
appendPQExpBufferStr(buf, columns);
PQclear(res);
termPQExpBuffer(&sql);
diff --git a/src/bin/scripts/createdb.c b/src/bin/scripts/createdb.c
index b0e4747786..7c0cf32d6a 100644
--- a/src/bin/scripts/createdb.c
+++ b/src/bin/scripts/createdb.c
@@ -198,6 +198,8 @@ main(int argc, char *argv[])
conn = connectMaintenanceDatabase(&cparams, progname, echo);
+ setFmtEncoding(PQclientEncoding(conn));
+
initPQExpBuffer(&sql);
appendPQExpBuffer(&sql, "CREATE DATABASE %s",
diff --git a/src/bin/scripts/createuser.c b/src/bin/scripts/createuser.c
index 6aaf833277..81e6abfc46 100644
--- a/src/bin/scripts/createuser.c
+++ b/src/bin/scripts/createuser.c
@@ -292,6 +292,8 @@ main(int argc, char *argv[])
conn = connectMaintenanceDatabase(&cparams, progname, echo);
+ setFmtEncoding(PQclientEncoding(conn));
+
initPQExpBuffer(&sql);
printfPQExpBuffer(&sql, "CREATE ROLE %s", fmtId(newuser));
diff --git a/src/bin/scripts/dropdb.c b/src/bin/scripts/dropdb.c
index ad762ffd43..0b63081827 100644
--- a/src/bin/scripts/dropdb.c
+++ b/src/bin/scripts/dropdb.c
@@ -129,13 +129,6 @@ main(int argc, char *argv[])
exit(0);
}
- initPQExpBuffer(&sql);
-
- appendPQExpBuffer(&sql, "DROP DATABASE %s%s%s;",
- (if_exists ? "IF EXISTS " : ""),
- fmtId(dbname),
- force ? " WITH (FORCE)" : "");
-
/* Avoid trying to drop postgres db while we are connected to it. */
if (maintenance_db == NULL && strcmp(dbname, "postgres") == 0)
maintenance_db = "template1";
@@ -149,6 +142,12 @@ main(int argc, char *argv[])
conn = connectMaintenanceDatabase(&cparams, progname, echo);
+ initPQExpBuffer(&sql);
+ appendPQExpBuffer(&sql, "DROP DATABASE %s%s%s;",
+ (if_exists ? "IF EXISTS " : ""),
+ fmtIdEnc(dbname, PQclientEncoding(conn)),
+ force ? " WITH (FORCE)" : "");
+
if (echo)
printf("%s\n", sql.data);
result = PQexec(conn, sql.data);
diff --git a/src/bin/scripts/dropuser.c b/src/bin/scripts/dropuser.c
index 8e5429a5cf..39bb168617 100644
--- a/src/bin/scripts/dropuser.c
+++ b/src/bin/scripts/dropuser.c
@@ -143,7 +143,8 @@ main(int argc, char *argv[])
initPQExpBuffer(&sql);
appendPQExpBuffer(&sql, "DROP ROLE %s%s;",
- (if_exists ? "IF EXISTS " : ""), fmtId(dropuser));
+ (if_exists ? "IF EXISTS " : ""),
+ fmtIdEnc(dropuser, PQclientEncoding(conn)));
if (echo)
printf("%s\n", sql.data);
diff --git a/src/bin/scripts/reindexdb.c b/src/bin/scripts/reindexdb.c
index 076462a62f..665864fd22 100644
--- a/src/bin/scripts/reindexdb.c
+++ b/src/bin/scripts/reindexdb.c
@@ -511,7 +511,8 @@ run_reindex_command(PGconn *conn, ReindexType type, const char *name,
if (tablespace)
{
- appendPQExpBuffer(&sql, "%sTABLESPACE %s", sep, fmtId(tablespace));
+ appendPQExpBuffer(&sql, "%sTABLESPACE %s", sep,
+ fmtIdEnc(tablespace, PQclientEncoding(conn)));
sep = comma;
}
@@ -551,7 +552,8 @@ run_reindex_command(PGconn *conn, ReindexType type, const char *name,
{
case REINDEX_DATABASE:
case REINDEX_SYSTEM:
- appendPQExpBufferStr(&sql, fmtId(name));
+ appendPQExpBufferStr(&sql,
+ fmtIdEnc(name, PQclientEncoding(conn)));
break;
case REINDEX_INDEX:
case REINDEX_TABLE:
@@ -774,8 +776,9 @@ get_parallel_object_list(PGconn *conn, ReindexType type,
for (i = 0; i < ntups; i++)
{
appendPQExpBufferStr(&buf,
- fmtQualifiedId(PQgetvalue(res, i, 1),
- PQgetvalue(res, i, 0)));
+ fmtQualifiedIdEnc(PQgetvalue(res, i, 1),
+ PQgetvalue(res, i, 0),
+ PQclientEncoding(conn)));
simple_string_list_append(tables, buf.data);
resetPQExpBuffer(&buf);
@@ -787,8 +790,9 @@ get_parallel_object_list(PGconn *conn, ReindexType type,
* the order of tables list.
*/
appendPQExpBufferStr(&buf,
- fmtQualifiedId(PQgetvalue(res, i, 1),
- PQgetvalue(res, i, 2)));
+ fmtQualifiedIdEnc(PQgetvalue(res, i, 1),
+ PQgetvalue(res, i, 2),
+ PQclientEncoding(conn)));
simple_string_list_append(user_list, buf.data);
resetPQExpBuffer(&buf);
diff --git a/src/bin/scripts/vacuumdb.c b/src/bin/scripts/vacuumdb.c
index 74fbc7ef03..982bf070be 100644
--- a/src/bin/scripts/vacuumdb.c
+++ b/src/bin/scripts/vacuumdb.c
@@ -784,8 +784,9 @@ vacuum_one_database(ConnParams *cparams,
for (i = 0; i < ntups; i++)
{
appendPQExpBufferStr(&buf,
- fmtQualifiedId(PQgetvalue(res, i, 1),
- PQgetvalue(res, i, 0)));
+ fmtQualifiedIdEnc(PQgetvalue(res, i, 1),
+ PQgetvalue(res, i, 0),
+ PQclientEncoding(conn)));
if (objects_listed && !PQgetisnull(res, i, 2))
appendPQExpBufferStr(&buf, PQgetvalue(res, i, 2));
diff --git a/src/fe_utils/string_utils.c b/src/fe_utils/string_utils.c
index 8d5a3b4a6e..2945e28a27 100644
--- a/src/fe_utils/string_utils.c
+++ b/src/fe_utils/string_utils.c
@@ -19,6 +19,7 @@
#include "common/keywords.h"
#include "fe_utils/string_utils.h"
+#include "mb/pg_wchar.h"
static PQExpBuffer defaultGetLocalPQExpBuffer(void);
@@ -26,6 +27,8 @@ static PQExpBuffer defaultGetLocalPQExpBuffer(void);
int quote_all_identifiers = 0;
PQExpBuffer (*getLocalPQExpBuffer) (void) = defaultGetLocalPQExpBuffer;
+static int fmtIdEncoding = -1;
+
/*
* Returns a temporary PQExpBuffer, valid until the next call to the function.
@@ -55,13 +58,47 @@ defaultGetLocalPQExpBuffer(void)
}
/*
+ * Set the encoding that fmtId() and fmtQualifiedId() use.
+ *
+ * This is not safe against multiple connections having different encodings,
+ * but there is no real other way to address the need to know the encoding for
+ * fmtId()/fmtQualifiedId() input for safe escaping. Eventually we should get
+ * rid of fmtId().
+ */
+void
+setFmtEncoding(int encoding)
+{
+ fmtIdEncoding = encoding;
+}
+
+/*
+ * Return the currently configured encoding for fmtId() and fmtQualifiedId().
+ */
+static int
+getFmtEncoding(void)
+{
+ if (fmtIdEncoding != -1)
+ return fmtIdEncoding;
+
+ /*
+ * In assertion builds it seems best to fail hard if the encoding was not
+ * set, to make it easier to find places with missing calls. But in
+ * production builds that seems like a bad idea, thus we instead just
+ * default to UTF-8.
+ */
+ Assert(fmtIdEncoding != -1);
+
+ return PG_UTF8;
+}
+
+/*
* Quotes input string if it's not a legitimate SQL identifier as-is.
*
- * Note that the returned string must be used before calling fmtId again,
+ * Note that the returned string must be used before calling fmtIdEnc again,
* since we re-use the same return buffer each time.
*/
const char *
-fmtId(const char *rawid)
+fmtIdEnc(const char *rawid, int encoding)
{
PQExpBuffer id_return = getLocalPQExpBuffer();
@@ -134,7 +171,24 @@ fmtId(const char *rawid)
}
/*
- * fmtQualifiedId - construct a schema-qualified name, with quoting as needed.
+ * Quotes input string if it's not a legitimate SQL identifier as-is.
+ *
+ * Note that the returned string must be used before calling fmtId again,
+ * since we re-use the same return buffer each time.
+ *
+ * NB: This assumes setFmtEncoding() previously has been called to configure
+ * the encoding of rawid. It is preferable to use fmtIdEnc() with an
+ * explicit encoding.
+ */
+const char *
+fmtId(const char *rawid)
+{
+ return fmtIdEnc(rawid, getFmtEncoding());
+}
+
+/*
+ * fmtQualifiedIdEnc - construct a schema-qualified name, with quoting as
+ * needed.
*
* Like fmtId, use the result before calling again.
*
@@ -142,7 +196,7 @@ fmtId(const char *rawid)
* use that buffer until we're finished with calling fmtId().
*/
const char *
-fmtQualifiedId(const char *schema, const char *id)
+fmtQualifiedIdEnc(const char *schema, const char *id, int encoding)
{
PQExpBuffer id_return;
PQExpBuffer lcl_pqexp = createPQExpBuffer();
@@ -150,9 +204,9 @@ fmtQualifiedId(const char *schema, const char *id)
/* Some callers might fail to provide a schema name */
if (schema && *schema)
{
- appendPQExpBuffer(lcl_pqexp, "%s.", fmtId(schema));
+ appendPQExpBuffer(lcl_pqexp, "%s.", fmtIdEnc(schema, encoding));
}
- appendPQExpBufferStr(lcl_pqexp, fmtId(id));
+ appendPQExpBufferStr(lcl_pqexp, fmtIdEnc(id, encoding));
id_return = getLocalPQExpBuffer();
@@ -162,6 +216,24 @@ fmtQualifiedId(const char *schema, const char *id)
return id_return->data;
}
+/*
+ * fmtQualifiedId - construct a schema-qualified name, with quoting as needed.
+ *
+ * Like fmtId, use the result before calling again.
+ *
+ * Since we call fmtId and it also uses getLocalPQExpBuffer() we cannot
+ * use that buffer until we're finished with calling fmtId().
+ *
+ * NB: This assumes setFmtEncoding() previously has been called to configure
+ * the encoding of schema/id. It is preferable to use fmtQualifiedIdEnc()
+ * with an explicit encoding.
+ */
+const char *
+fmtQualifiedId(const char *schema, const char *id)
+{
+ return fmtQualifiedIdEnc(schema, id, getFmtEncoding());
+}
+
/*
* Format a Postgres version number (in the PG_VERSION_NUM integer format
diff --git a/src/include/fe_utils/string_utils.h b/src/include/fe_utils/string_utils.h
index 690195fa9f..dc991a9321 100644
--- a/src/include/fe_utils/string_utils.h
+++ b/src/include/fe_utils/string_utils.h
@@ -25,7 +25,10 @@ extern PQExpBuffer (*getLocalPQExpBuffer) (void);
/* Functions */
extern const char *fmtId(const char *rawid);
+extern const char *fmtIdEnc(const char *rawid, int encoding);
extern const char *fmtQualifiedId(const char *schema, const char *id);
+extern const char *fmtQualifiedIdEnc(const char *schema, const char *id, int encoding);
+extern void setFmtEncoding(int encoding);
extern char *formatPGVersionNumber(int version_number, bool include_minor,
char *buf, size_t buflen);