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Rename "scram" to "scram-sha-256" in pg_hba.conf and password_encryption.
Per discussion, plain "scram" is confusing because we actually implement SCRAM-SHA-256 rather than the original SCRAM that uses SHA-1 as the hash algorithm. If we add support for SCRAM-SHA-512 or some other mechanism in the SCRAM family in the future, that would become even more confusing. Most of the internal files and functions still use just "scram" as a shorthand for SCRMA-SHA-256, but I did change PASSWORD_TYPE_SCRAM to PASSWORD_TYPE_SCRAM_SHA_256, as that could potentially be used by 3rd party extensions that hook into the password-check hook. Michael Paquier did this in an earlier version of the SCRAM patch set already, but I didn't include that in the version that was committed. Discussion: https://www.postgresql.org/message-id/fde71ff1-5858-90c8-99a9-1c2427e7bafb@iki.fi
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-59
lines changed

15 files changed

+60
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‎doc/src/sgml/client-auth.sgml

Lines changed: 8 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -412,7 +412,7 @@ hostnossl <replaceable>database</replaceable> <replaceable>user</replaceable>
412412
</varlistentry>
413413

414414
<varlistentry>
415-
<term><literal>scram</></term>
415+
<term><literal>scram-sha-256</></term>
416416
<listitem>
417417
<para>
418418
Perform SCRAM-SHA-256 authentication to verify the user's
@@ -683,7 +683,7 @@ host postgres all 192.168.93.0/24 ident
683683
# "postgres" if the user's password is correctly supplied.
684684
#
685685
# TYPE DATABASE USER ADDRESS METHOD
686-
host postgres all 192.168.12.10/32 scram
686+
host postgres all 192.168.12.10/32 scram-sha-256
687687

688688
# Allow any user from hosts in the example.com domain to connect to
689689
# any database if the user's password is correctly supplied.
@@ -694,7 +694,7 @@ host postgres all 192.168.12.10/32 scram
694694
#
695695
# TYPE DATABASE USER ADDRESS METHOD
696696
host all mike .example.com md5
697-
host all all .example.com scram
697+
host all all .example.com scram-sha-256
698698

699699
# In the absence of preceding "host" lines, these two lines will
700700
# reject all connections from 192.168.54.1 (since that entry will be
@@ -922,7 +922,7 @@ omicron bryanh guest1
922922
</indexterm>
923923

924924
<para>
925-
The password-based authentication methods are <literal>scram</>,
925+
The password-based authentication methods are <literal>scram-sha-256</>,
926926
<literal>md5</>, and <literal>password</>. These methods operate
927927
similarly except for the way that the password is sent across the
928928
connection.
@@ -939,8 +939,9 @@ omicron bryanh guest1
939939

940940

941941
<para>
942-
<literal>scram</> performs SCRAM-SHA-256 authentication, as described
943-
in <ulink url="https://tools.ietf.org/html/rfc5802">RFC5802</ulink>. It
942+
<literal>scram-sha-256</> performs SCRAM-SHA-256 authentication, as
943+
described in
944+
<ulink url="https://tools.ietf.org/html/rfc5802">RFC5802</ulink>. It
944945
is a challenge-response scheme, that prevents password sniffing on
945946
untrusted connections. It is more secure than the <literal>md5</>
946947
method, but might not be supported by older clients.
@@ -953,7 +954,7 @@ omicron bryanh guest1
953954
protection if an attacker manages to steal the password hash from the
954955
server, and it cannot be used with the <xref
955956
linkend="guc-db-user-namespace"> feature. For all other users,
956-
<literal>md5</> works the same as <literal>scram</>.
957+
<literal>md5</> works the same as <literal>scram-sha-256</>.
957958
</para>
958959

959960
<para>

‎doc/src/sgml/config.sgml

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1194,8 +1194,8 @@ include_dir 'conf.d'
11941194
stores the password as an MD5 hash. Setting this to <literal>plain</> stores
11951195
it in plaintext. <literal>on</> and <literal>off</> are also accepted, as
11961196
aliases for <literal>md5</> and <literal>plain</>, respectively. Setting
1197-
this parameter to <literal>scram</> will encrypt the password with
1198-
SCRAM-SHA-256.
1197+
this parameter to <literal>scram-sha-256</> will encrypt the password
1198+
with SCRAM-SHA-256.
11991199
</para>
12001200
</listitem>
12011201
</varlistentry>

‎src/backend/commands/user.c

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -140,8 +140,8 @@ CreateRole(ParseState *pstate, CreateRoleStmt *stmt)
140140
dpassword = defel;
141141
if (strcmp(defel->defname, "encryptedPassword") == 0)
142142
{
143-
if (Password_encryption == PASSWORD_TYPE_SCRAM)
144-
password_type = PASSWORD_TYPE_SCRAM;
143+
if (Password_encryption == PASSWORD_TYPE_SCRAM_SHA_256)
144+
password_type = PASSWORD_TYPE_SCRAM_SHA_256;
145145
else
146146
password_type = PASSWORD_TYPE_MD5;
147147
}
@@ -548,8 +548,8 @@ AlterRole(AlterRoleStmt *stmt)
548548
dpassword = defel;
549549
if (strcmp(defel->defname, "encryptedPassword") == 0)
550550
{
551-
if (Password_encryption == PASSWORD_TYPE_SCRAM)
552-
password_type = PASSWORD_TYPE_SCRAM;
551+
if (Password_encryption == PASSWORD_TYPE_SCRAM_SHA_256)
552+
password_type = PASSWORD_TYPE_SCRAM_SHA_256;
553553
else
554554
password_type = PASSWORD_TYPE_MD5;
555555
}

‎src/backend/libpq/auth-scram.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -183,7 +183,7 @@ pg_be_scram_init(const char *username, const char *shadow_pass)
183183
{
184184
int password_type = get_password_type(shadow_pass);
185185

186-
if (password_type == PASSWORD_TYPE_SCRAM)
186+
if (password_type == PASSWORD_TYPE_SCRAM_SHA_256)
187187
{
188188
if (parse_scram_verifier(shadow_pass, &state->salt, &state->iterations,
189189
state->StoredKey, state->ServerKey))

‎src/backend/libpq/auth.c

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -50,7 +50,7 @@ static char *recv_password_packet(Port *port);
5050

5151

5252
/*----------------------------------------------------------------
53-
* Password-based authentication methods (password, md5, and scram)
53+
* Password-based authentication methods (password, md5, and scram-sha-256)
5454
*----------------------------------------------------------------
5555
*/
5656
static int CheckPasswordAuth(Port *port, char **logdetail);
@@ -757,10 +757,10 @@ CheckPWChallengeAuth(Port *port, char **logdetail)
757757
* If the user does not exist, or has no password, we still go through the
758758
* motions of authentication, to avoid revealing to the client that the
759759
* user didn't exist. If 'md5' is allowed, we choose whether to use 'md5'
760-
* or 'scram' authentication based on current password_encryption setting.
761-
* The idea is that most genuine users probably have a password of that
762-
* type, if we pretend that this user had a password of that type, too, it
763-
* "blends in" best.
760+
* or 'scram-sha-256' authentication based on current password_encryption
761+
* setting. The idea is that most genuine users probably have a password
762+
* of that type, if we pretend that this user had a password of that type,
763+
* too, it "blends in" best.
764764
*
765765
* If the user had a password, but it was expired, we'll use the details
766766
* of the expired password for the authentication, but report it as
@@ -773,9 +773,9 @@ CheckPWChallengeAuth(Port *port, char **logdetail)
773773

774774
/*
775775
* If 'md5' authentication is allowed, decide whether to perform 'md5' or
776-
* 'scram' authentication based on the type of password the user has. If
777-
* it's an MD5 hash, we must do MD5 authentication, and if it's a SCRAM
778-
* verifier, we must do SCRAM authentication. If it's stored in
776+
* 'scram-sha-256' authentication based on the type of password the user
777+
* has. If it's an MD5 hash, we must do MD5 authentication, and if it's
778+
* a SCRAM verifier, we must do SCRAM authentication. If it's stored in
779779
* plaintext, we could do either one, so we opt for the more secure
780780
* mechanism, SCRAM.
781781
*

‎src/backend/libpq/crypt.c

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -101,7 +101,7 @@ get_password_type(const char *shadow_pass)
101101
if (strncmp(shadow_pass, "md5", 3) == 0 && strlen(shadow_pass) == MD5_PASSWD_LEN)
102102
return PASSWORD_TYPE_MD5;
103103
if (strncmp(shadow_pass, "scram-sha-256:", strlen("scram-sha-256:")) == 0)
104-
return PASSWORD_TYPE_SCRAM;
104+
return PASSWORD_TYPE_SCRAM_SHA_256;
105105
return PASSWORD_TYPE_PLAINTEXT;
106106
}
107107

@@ -141,7 +141,7 @@ encrypt_password(PasswordType target_type, const char *role,
141141
elog(ERROR, "password encryption failed");
142142
return encrypted_password;
143143

144-
case PASSWORD_TYPE_SCRAM:
144+
case PASSWORD_TYPE_SCRAM_SHA_256:
145145

146146
/*
147147
* cannot convert a SCRAM verifier to an MD5 hash, so fall
@@ -152,7 +152,7 @@ encrypt_password(PasswordType target_type, const char *role,
152152
}
153153
break;
154154

155-
case PASSWORD_TYPE_SCRAM:
155+
case PASSWORD_TYPE_SCRAM_SHA_256:
156156
switch (guessed_type)
157157
{
158158
case PASSWORD_TYPE_PLAINTEXT:
@@ -164,7 +164,7 @@ encrypt_password(PasswordType target_type, const char *role,
164164
* cannot convert an MD5 hash to a SCRAM verifier, so fall
165165
* through to save the MD5 hash instead.
166166
*/
167-
case PASSWORD_TYPE_SCRAM:
167+
case PASSWORD_TYPE_SCRAM_SHA_256:
168168
return pstrdup(password);
169169
}
170170
break;
@@ -280,7 +280,7 @@ plain_crypt_verify(const char *role, const char *shadow_pass,
280280
*/
281281
switch (get_password_type(shadow_pass))
282282
{
283-
case PASSWORD_TYPE_SCRAM:
283+
case PASSWORD_TYPE_SCRAM_SHA_256:
284284
if (scram_verify_plain_password(role,
285285
client_pass,
286286
shadow_pass))

‎src/backend/libpq/hba.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -126,7 +126,7 @@ static const char *const UserAuthName[] =
126126
"ident",
127127
"password",
128128
"md5",
129-
"scram",
129+
"scram-sha256",
130130
"gss",
131131
"sspi",
132132
"pam",
@@ -1327,7 +1327,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
13271327
}
13281328
parsedline->auth_method = uaMD5;
13291329
}
1330-
else if (strcmp(token->string, "scram") == 0)
1330+
else if (strcmp(token->string, "scram-sha-256") == 0)
13311331
parsedline->auth_method = uaSCRAM;
13321332
else if (strcmp(token->string, "pam") == 0)
13331333
#ifdef USE_PAM

‎src/backend/libpq/pg_hba.conf.sample

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -42,10 +42,10 @@
4242
# or "samenet" to match any address in any subnet that the server is
4343
# directly connected to.
4444
#
45-
# METHOD can be "trust", "reject", "md5", "password", "scram", "gss",
46-
# "sspi", "ident", "peer", "pam", "ldap", "radius" or "cert". Note that
47-
# "password" sends passwords in clear text; "md5" or "scram" are preferred
48-
# since they send encrypted passwords.
45+
# METHOD can be "trust", "reject", "md5", "password", "scram-sha-256",
46+
# "gss", "sspi", "ident", "peer", "pam", "ldap", "radius" or "cert".
47+
# Note that "password" sends passwords in clear text; "md5" or
48+
# "scram-sha-256" are preferred since they send encrypted passwords.
4949
#
5050
# OPTIONS are a set of options for the authentication in the format
5151
# NAME=VALUE. The available options depend on the different

‎src/backend/utils/misc/guc.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -410,7 +410,7 @@ static const struct config_enum_entry force_parallel_mode_options[] = {
410410
static const struct config_enum_entry password_encryption_options[] = {
411411
{"plain", PASSWORD_TYPE_PLAINTEXT, false},
412412
{"md5", PASSWORD_TYPE_MD5, false},
413-
{"scram", PASSWORD_TYPE_SCRAM, false},
413+
{"scram-sha-256", PASSWORD_TYPE_SCRAM_SHA_256, false},
414414
{"off", PASSWORD_TYPE_PLAINTEXT, false},
415415
{"on", PASSWORD_TYPE_MD5, false},
416416
{"true", PASSWORD_TYPE_MD5, true},

‎src/bin/initdb/initdb.c

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -77,7 +77,7 @@
7777
extern const char *select_default_timezone(const char *share_path);
7878

7979
static const char *const auth_methods_host[] = {
80-
"trust", "reject", "md5", "password", "scram", "ident", "radius",
80+
"trust", "reject", "scram-sha-256", "md5", "password", "ident", "radius",
8181
#ifdef ENABLE_GSS
8282
"gss",
8383
#endif
@@ -99,7 +99,7 @@ static const char *const auth_methods_host[] = {
9999
NULL
100100
};
101101
static const char *const auth_methods_local[] = {
102-
"trust", "reject", "md5", "scram", "password", "peer", "radius",
102+
"trust", "reject", "scram-sha-256", "md5", "password", "peer", "radius",
103103
#ifdef USE_PAM
104104
"pam", "pam ",
105105
#endif
@@ -1130,12 +1130,12 @@ setup_config(void)
11301130
"#update_process_title = off");
11311131
#endif
11321132

1133-
if (strcmp(authmethodlocal, "scram") == 0 ||
1134-
strcmp(authmethodhost, "scram") == 0)
1133+
if (strcmp(authmethodlocal, "scram-sha-256") == 0 ||
1134+
strcmp(authmethodhost, "scram-sha-256") == 0)
11351135
{
11361136
conflines = replace_token(conflines,
11371137
"#password_encryption = md5",
1138-
"password_encryption = scram");
1138+
"password_encryption = scram-sha-256");
11391139
}
11401140

11411141
snprintf(path, sizeof(path), "%s/postgresql.conf", pg_data);
@@ -2329,16 +2329,16 @@ check_need_password(const char *authmethodlocal, const char *authmethodhost)
23292329
{
23302330
if ((strcmp(authmethodlocal, "md5") == 0 ||
23312331
strcmp(authmethodlocal, "password") == 0 ||
2332-
strcmp(authmethodlocal, "scram") == 0) &&
2332+
strcmp(authmethodlocal, "scram-sha-256") == 0) &&
23332333
(strcmp(authmethodhost, "md5") == 0 ||
23342334
strcmp(authmethodhost, "password") == 0 ||
2335-
strcmp(authmethodhost, "scram") == 0) &&
2335+
strcmp(authmethodhost, "scram-sha-256") == 0) &&
23362336
!(pwprompt || pwfilename))
23372337
{
23382338
fprintf(stderr, _("%s: must specify a password for the superuser to enable %s authentication\n"), progname,
23392339
(strcmp(authmethodlocal, "md5") == 0 ||
23402340
strcmp(authmethodlocal, "password") == 0 ||
2341-
strcmp(authmethodlocal, "scram") == 0)
2341+
strcmp(authmethodlocal, "scram-sha-256") == 0)
23422342
? authmethodlocal
23432343
: authmethodhost);
23442344
exit(1);

‎src/include/libpq/crypt.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -25,7 +25,7 @@ typedef enum PasswordType
2525
{
2626
PASSWORD_TYPE_PLAINTEXT = 0,
2727
PASSWORD_TYPE_MD5,
28-
PASSWORD_TYPE_SCRAM
28+
PASSWORD_TYPE_SCRAM_SHA_256
2929
} PasswordType;
3030

3131
extern PasswordType get_password_type(const char *shadow_pass);

‎src/test/authentication/t/001_password.pl

Lines changed: 7 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -51,7 +51,7 @@ sub test_role
5151

5252
# Create 3 roles with different password methods for each one. The same
5353
# password is used for all of them.
54-
$node->safe_psql('postgres', "SET password_encryption='scram'; CREATE ROLE scram_role LOGIN PASSWORD 'pass';");
54+
$node->safe_psql('postgres', "SET password_encryption='scram-sha-256'; CREATE ROLE scram_role LOGIN PASSWORD 'pass';");
5555
$node->safe_psql('postgres', "SET password_encryption='md5'; CREATE ROLE md5_role LOGIN PASSWORD 'pass';");
5656
$node->safe_psql('postgres', "SET password_encryption='plain'; CREATE ROLE plain_role LOGIN PASSWORD 'pass';");
5757
$ENV{"PGPASSWORD"} = 'pass';
@@ -68,12 +68,12 @@ sub test_role
6868
test_role($node, 'md5_role', 'password', 0);
6969
test_role($node, 'plain_role', 'password', 0);
7070

71-
# For "scram" method, user "plain_role" and "scram_role" should be able to
72-
# connect.
73-
reset_pg_hba($node, 'scram');
74-
test_role($node, 'scram_role', 'scram', 0);
75-
test_role($node, 'md5_role', 'scram', 2);
76-
test_role($node, 'plain_role', 'scram', 0);
71+
# For "scram-sha-256" method, user "plain_role" and "scram_role" should
72+
# be able to connect.
73+
reset_pg_hba($node, 'scram-sha-256');
74+
test_role($node, 'scram_role', 'scram-sha-256', 0);
75+
test_role($node, 'md5_role', 'scram-sha-256', 2);
76+
test_role($node, 'plain_role', 'scram-sha-256', 0);
7777

7878
# For "md5" method, all users should be able to connect (SCRAM
7979
# authentication will be performed for the user with a scram verifier.)

‎src/test/authentication/t/002_saslprep.pl

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -63,7 +63,7 @@ sub test_login
6363

6464
# Create test roles.
6565
$node->safe_psql('postgres',
66-
"SET password_encryption='scram';
66+
"SET password_encryption='scram-sha-256';
6767
SET client_encoding='utf8';
6868
CREATE ROLE saslpreptest1_role LOGIN PASSWORD 'IX';
6969
CREATE ROLE saslpreptest4a_role LOGIN PASSWORD 'a';
@@ -73,7 +73,7 @@ sub test_login
7373
");
7474

7575
# Require password from now on.
76-
reset_pg_hba($node, 'scram');
76+
reset_pg_hba($node, 'scram-sha-256');
7777

7878
# Check that #1 and #5 are treated the same as just 'IX'
7979
test_login($node, 'saslpreptest1_role', "I\xc2\xadX", 0);

‎src/test/regress/expected/password.out

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4,19 +4,19 @@
44
-- Tests for GUC password_encryption
55
SET password_encryption = 'novalue'; -- error
66
ERROR: invalid value for parameter "password_encryption": "novalue"
7-
HINT: Available values: plain, md5, scram, off, on.
7+
HINT: Available values: plain, md5, scram-sha-256, off, on.
88
SET password_encryption = true; -- ok
99
SET password_encryption = 'md5'; -- ok
1010
SET password_encryption = 'plain'; -- ok
11-
SET password_encryption = 'scram'; -- ok
11+
SET password_encryption = 'scram-sha-256'; -- ok
1212
-- consistency of password entries
1313
SET password_encryption = 'plain';
1414
CREATE ROLE regress_passwd1 PASSWORD 'role_pwd1';
1515
SET password_encryption = 'md5';
1616
CREATE ROLE regress_passwd2 PASSWORD 'role_pwd2';
1717
SET password_encryption = 'on';
1818
CREATE ROLE regress_passwd3 PASSWORD 'role_pwd3';
19-
SET password_encryption = 'scram';
19+
SET password_encryption = 'scram-sha-256';
2020
CREATE ROLE regress_passwd4 PASSWORD 'role_pwd4';
2121
SET password_encryption = 'plain';
2222
CREATE ROLE regress_passwd5 PASSWORD NULL;
@@ -60,7 +60,7 @@ ALTER ROLE regress_passwd2 UNENCRYPTED PASSWORD 'md5dfa155cadd5f4ad57860162f3fab
6060
SET password_encryption = 'md5';
6161
ALTER ROLE regress_passwd3 ENCRYPTED PASSWORD 'foo'; -- encrypted with MD5
6262
ALTER ROLE regress_passwd4 ENCRYPTED PASSWORD 'scram-sha-256:VLK4RMaQLCvNtQ==:4096:3ded2376f7aafa93b1bdbd71bcc18b7d6ee50ed018029cc583d152ef3fc7d430:a6dd36dfc94c181956a6ae95f05e01b1864f0a22a2657d1de4ba84d2a24dc438'; -- client-supplied SCRAM verifier, use as it is
63-
SET password_encryption = 'scram';
63+
SET password_encryption = 'scram-sha-256';
6464
ALTER ROLE regress_passwd5 ENCRYPTED PASSWORD 'foo'; -- create SCRAM verifier
6565
CREATE ROLE regress_passwd6 ENCRYPTED PASSWORD 'md53725413363ab045e20521bf36b8d8d7f'; -- encrypted with MD5, use as it is
6666
SELECT rolname, regexp_replace(rolpassword, '(scram-sha-256):([a-zA-Z0-9+/]+==):(\d+):(\w+):(\w+)', '\1:<salt>:\3:<storedkey>:<serverkey>') as rolpassword_masked

‎src/test/regress/sql/password.sql

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@ SET password_encryption = 'novalue'; -- error
77
SET password_encryption = true; -- ok
88
SET password_encryption = 'md5'; -- ok
99
SET password_encryption = 'plain'; -- ok
10-
SET password_encryption = 'scram'; -- ok
10+
SET password_encryption = 'scram-sha-256'; -- ok
1111

1212
-- consistency of password entries
1313
SET password_encryption = 'plain';
@@ -16,7 +16,7 @@ SET password_encryption = 'md5';
1616
CREATE ROLE regress_passwd2 PASSWORD 'role_pwd2';
1717
SET password_encryption = 'on';
1818
CREATE ROLE regress_passwd3 PASSWORD 'role_pwd3';
19-
SET password_encryption = 'scram';
19+
SET password_encryption = 'scram-sha-256';
2020
CREATE ROLE regress_passwd4 PASSWORD 'role_pwd4';
2121
SET password_encryption = 'plain';
2222
CREATE ROLE regress_passwd5 PASSWORD NULL;
@@ -50,7 +50,7 @@ ALTER ROLE regress_passwd3 ENCRYPTED PASSWORD 'foo'; -- encrypted with MD5
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ALTER ROLE regress_passwd4 ENCRYPTED PASSWORD 'scram-sha-256:VLK4RMaQLCvNtQ==:4096:3ded2376f7aafa93b1bdbd71bcc18b7d6ee50ed018029cc583d152ef3fc7d430:a6dd36dfc94c181956a6ae95f05e01b1864f0a22a2657d1de4ba84d2a24dc438'; -- client-supplied SCRAM verifier, use as it is
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SET password_encryption = 'scram';
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SET password_encryption = 'scram-sha-256';
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ALTER ROLE regress_passwd5 ENCRYPTED PASSWORD 'foo'; -- create SCRAM verifier
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CREATE ROLE regress_passwd6 ENCRYPTED PASSWORD 'md53725413363ab045e20521bf36b8d8d7f'; -- encrypted with MD5, use as it is
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