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credcheck.c
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/*-------------------------------------------------------------------------
*
* credcheck.c:
* This file has the general PostgreSQL credential checks.
*
* This program is open source, licensed under the PostgreSQL license.
* For license terms, see the LICENSE file.
*
* Copyright (C) 2021-2023: MigOps Inc
* Copyright (C) 2023: Gilles Darold
*
*-------------------------------------------------------------------------
*/
#include <ctype.h>
#include <limits.h>
#include <unistd.h>
#ifdef USE_CRACKLIB
#include <crack.h>
#endif
#include "postgres.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "catalog/catalog.h"
#include "catalog/indexing.h"
#include "catalog/pg_auth_members.h"
#include "catalog/pg_authid.h"
#include "commands/user.h"
#if PG_VERSION_NUM >= 140000
#include "common/hmac.h"
#endif
#include "common/sha2.h"
#include "executor/spi.h"
#include "libpq/auth.h"
#include "nodes/makefuncs.h"
#include "nodes/nodes.h"
#include "nodes/pg_list.h"
#include "postmaster/postmaster.h"
#include "tcop/utility.h"
#include "storage/ipc.h"
#include "storage/lwlock.h"
#include "storage/shmem.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "utils/timestamp.h"
/* Default passord encryption */
#define Password_encryption = PASSWORD_TYPE_SCRAM_SHA_256;
/* Name of external file to store password history in the PGDATA */
#define PGPH_DUMP_FILE "global/pg_password_history"
/* Number of output arguments (columns) in the pg_password_history pseudo table */
#define PG_PASSWORD_HISTORY_COLS 3
/* Number of output arguments (columns) in the pg_banned_role pseudo table */
#define PG_BANNED_ROLE_COLS 3
/* Magic number identifying the stats file format */
static const uint32 PGPH_FILE_HEADER = 0x48504750;
/* credcheck password history version, changes in which invalidate all entries */
static const uint32 PGPH_VERSION = 100;
#define PGPH_TRANCHE_NAME "credcheck_history"
#define PGAF_TRANCHE_NAME "credcheck_auth_failure"
static bool statement_has_password = false;
static bool no_password_logging = true;
#if PG_VERSION_NUM < 120000
#define table_open(r,l) heap_open(r,l)
#define table_openrv(r,l) heap_openrv(r,l)
#define table_close(r,l) heap_close(r,l)
#endif
#if PG_VERSION_NUM < 100000
#error Minimum version of PostgreSQL required is 10
#endif
/* Define ProcessUtility hook proto/parameters following the PostgreSQL version */
#if PG_VERSION_NUM >= 140000
#define PEL_PROCESSUTILITY_PROTO PlannedStmt *pstmt, const char *queryString, \
bool readOnlyTree, \
ProcessUtilityContext context, ParamListInfo params, \
QueryEnvironment *queryEnv, DestReceiver *dest, \
QueryCompletion *qc
#define PEL_PROCESSUTILITY_ARGS pstmt, queryString, readOnlyTree, context, params, queryEnv, dest, qc
#else
#if PG_VERSION_NUM >= 130000
#define PEL_PROCESSUTILITY_PROTO PlannedStmt *pstmt, const char *queryString, \
ProcessUtilityContext context, ParamListInfo params, \
QueryEnvironment *queryEnv, DestReceiver *dest, \
QueryCompletion *qc
#define PEL_PROCESSUTILITY_ARGS pstmt, queryString, context, params, queryEnv, dest, qc
#else
#define PEL_PROCESSUTILITY_PROTO PlannedStmt *pstmt, const char *queryString, \
ProcessUtilityContext context, ParamListInfo params, \
QueryEnvironment *queryEnv, DestReceiver *dest, \
char *completionTag
#define PEL_PROCESSUTILITY_ARGS pstmt, queryString, context, params, queryEnv, dest, completionTag
#endif
#endif
PG_MODULE_MAGIC;
/* Hooks */
static check_password_hook_type prev_check_password_hook = NULL;
static ProcessUtility_hook_type prev_ProcessUtility = NULL;
static shmem_startup_hook_type prev_shmem_startup_hook = NULL;
#if PG_VERSION_NUM >= 150000
static shmem_request_hook_type prev_shmem_request_hook = NULL;
#endif
/* Hold previous client authent hook */
static ClientAuthentication_hook_type prev_ClientAuthentication = NULL;
/* Hold previous logging hook */
static emit_log_hook_type prev_log_hook = NULL;
/* In memory storage of password history */
typedef struct pgphHashKey
{
char rolename[NAMEDATALEN];
char password_hash[PG_SHA256_DIGEST_STRING_LENGTH];
} pgphHashKey;
typedef struct pgphEntry
{
pgphHashKey key; /* hash key of entry - MUST BE FIRST */
TimestampTz password_date;
} pgphEntry;
/* Global shared state */
typedef struct pgphSharedState
{
LWLock *lock; /* protects hashtable search/modification */
int num_entries; /* number of entries in the password history */
} pgphSharedState;
/* Links to shared memory state */
static pgphSharedState *pgph = NULL;
static HTAB *pgph_hash = NULL;
static int pgph_max = 65535;
static int pgaf_max = 1024;
static int fail_max = 0;
static bool reset_superuser = false;
static bool encrypted_password_allowed = false;
/* In memory storage of auth failure history */
typedef struct pgafHashKey
{
Oid roleid;
} pgafHashKey;
typedef struct pgafEntry
{
pgafHashKey key; /* hash key of entry - MUST BE FIRST */
float failure_count;
TimestampTz banned_date;
} pgafEntry;
/* Global shared state */
typedef struct pgafSharedState
{
LWLock *lock; /* protects hashtable search/modification */
int num_entries; /* number of entries in the auth failure history */
} pgafSharedState;
static pgafSharedState *pgaf = NULL;
static HTAB *pgaf_hash = NULL;
/* Functions */
extern void _PG_init(void);
extern void _PG_fini(void);
static void cc_ProcessUtility(PEL_PROCESSUTILITY_PROTO);
static void flush_password_history(void);
static pgphEntry *pgph_entry_alloc(pgphHashKey *key, TimestampTz password_date);
static pgafEntry *pgaf_entry_alloc(pgafHashKey *key, float failure_count);
#if PG_VERSION_NUM >= 150000
static void pghist_shmem_request(void);
#endif
static void pghist_shmem_startup(void);
static void pgph_shmem_startup(void);
static void pgaf_shmem_startup(void);
static int entry_cmp(const void *lhs, const void *rhs);
static Size pgph_memsize(void);
static void pg_password_history_internal(FunctionCallInfo fcinfo);
static void fix_log(ErrorData *edata);
static Size pgaf_memsize(void);
static void credcheck_max_auth_failure(Port *port, int status);
static float get_auth_failure(const char *username, Oid userid, int status);
static float save_auth_failure(const char *username, Oid userid);
static void remove_auth_failure(const char *username, Oid userid);
static void pg_banned_role_internal(FunctionCallInfo fcinfo);
/* Username flags*/
static int username_min_length = 1;
static int username_min_special = 0;
static int username_min_digit = 0;
static int username_min_upper = 0;
static int username_min_lower = 0;
static int username_min_repeat = 0;
static char *username_not_contain = NULL;
static char *username_contain = NULL;
static bool username_contain_password = true;
static bool username_ignore_case = false;
/* Password flags*/
static int password_min_length = 1;
static int password_min_special = 0;
static int password_min_digit = 0;
static int password_min_upper = 0;
static int password_min_lower = 0;
static int password_min_repeat = 0;
static char *password_not_contain = NULL;
static char *password_contain = NULL;
static bool password_contain_username = true;
static bool password_ignore_case = false;
static int password_valid_until = 0;
static int password_valid_max = 0;
#if PG_VERSION_NUM >= 120000
/*
password_reuse_history:
number of distinct passwords set before a password can be reused.
password_reuse_interval:
amount of time it takes before a password can be reused again.
*/
static int password_reuse_history = 0;
static int password_reuse_interval = 0;
char *str_to_sha256(const char *str, const char *salt);
#endif
static char *to_nlower(const char *str, size_t max) {
char *lower_str;
int i = 0;
lower_str = (char *)calloc(strlen(str), sizeof(char));
for (const char *p = str; *p && i < max; p++) {
lower_str[i++] = tolower(*p);
}
lower_str[i] = '\0';
return lower_str;
}
static bool str_contains(const char *chars, const char *str) {
for (const char *i = str; *i; i++) {
for (const char *j = chars; *j; j++) {
if (*i == *j) {
return true;
}
}
}
return false;
}
static void check_str_counters(const char *str, int *lower, int *upper,
int *digit, int *special) {
for (const char *i = str; *i; i++) {
if (islower(*i)) {
(*lower)++;
} else if (isupper(*i)) {
(*upper)++;
} else if (isdigit(*i)) {
(*digit)++;
} else {
(*special)++;
}
}
}
static bool char_repeat_exceeds(const char *str, int max_repeat) {
int occurred = 1;
size_t len = strlen(str);
/*if string has only one character, then no need to proceed further*/
if (len==1) {
return false;
}
for (size_t i = 0; i < len;) {
occurred = 1;
/*first character = str[i]
second character = str[i+1]
search for an adjacent repeated characters
for example, in this string "weekend summary"
search for the series "ee", "mm"
*/
for (size_t j = (i + 1), k = 1; j < len; j++, k++) {
/* character matched*/
if (str[i] == str[j]) {
/* is the previous, current character positions are adjacent*/
if (i + k == j) {
occurred++;
if (occurred > max_repeat) {
return true;
}
}
}
/* if we reach an end of the string, no need to process further*/
if (j + 1 == len) {
return false;
}
/* if the characters are not equal then point "i" to "j"*/
if (str[i] != str[j]) {
i = j;
break;
}
}
}
return false;
}
static void
username_check(const char *username, const char *password)
{
int user_total_special = 0;
int user_total_digit = 0;
int user_total_upper = 0;
int user_total_lower = 0;
char *tmp_pass = NULL;
char *tmp_user = NULL;
char *tmp_contains = NULL;
char *tmp_not_contains = NULL;
if (strcasestr(debug_query_string, "PASSWORD") != NULL)
statement_has_password = true;
/* checks has to be done by ignoring case */
if (username_ignore_case)
{
if (password != NULL && strlen(password) > 0)
tmp_pass = to_nlower(password, INT_MAX);
tmp_user = to_nlower(username, INT_MAX);
tmp_contains = to_nlower(username_contain, INT_MAX);
tmp_not_contains = to_nlower(username_not_contain, INT_MAX);
}
else
{
if (password != NULL && strlen(password) > 0)
tmp_pass = strndup(password, INT_MAX);
tmp_user = strndup(username, INT_MAX);
tmp_contains = strndup(username_contain, INT_MAX);
tmp_not_contains = strndup(username_not_contain, INT_MAX);
}
/* Rule 1: username length */
if (strnlen(tmp_user, INT_MAX) < username_min_length)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("username length should match the configured %s"),
"credcheck.username_min_length")));
goto clean;
}
/* Rule 2: username contains password
* Note:
* tmp_pass is NULL for ALTER USER ... RENAME TO ...;
* statement so this rule can not be applied.
*/
if (tmp_pass != NULL && username_contain_password)
{
if (strstr(tmp_user, tmp_pass)) {
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("username should not contain password"))));
goto clean;
}
}
/* Rule 3: contain characters */
if (tmp_contains != NULL && strlen(tmp_contains) > 0)
{
if (str_contains(tmp_contains, tmp_user) == false)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("username does not contain the configured %s characters"),
"credcheck.username_contain")));
goto clean;
}
}
/* Rule 4: not contain characters */
if (tmp_not_contains != NULL && strlen(tmp_not_contains) > 0)
{
if (str_contains(tmp_not_contains, tmp_user) == true)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("username contains the configured %s unauthorized characters"),
"credcheck.username_not_contain")));
goto clean;
}
}
check_str_counters(tmp_user, &user_total_lower, &user_total_upper,
&user_total_digit, &user_total_special);
/* Rule 5: total upper characters */
if (!username_ignore_case && user_total_upper < username_min_upper)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("username does not contain the configured %s characters",
"credcheck.username_min_upper")));
goto clean;
}
/* Rule 6: total lower characters */
if (!username_ignore_case && user_total_lower < username_min_lower)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("username does not contain the configured %s characters",
"credcheck.username_min_lower")));
goto clean;
}
/* Rule 7: total digits */
if (user_total_digit < username_min_digit)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("username does not contain the configured %s characters",
"credcheck.username_min_digit")));
goto clean;
}
/* Rule 8: total special */
if (user_total_special < username_min_special)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("username does not contain the configured %s characters",
"credcheck.username_min_special")));
goto clean;
}
/* Rule 9: minimum char repeat */
if (username_min_repeat)
{
if (char_repeat_exceeds(tmp_user, username_min_repeat))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("%s characters are repeated more than the "
"configured %s times"), "username", "credcheck.username_min_repeat")));
goto clean;
}
}
clean:
free(tmp_pass);
free(tmp_user);
free(tmp_contains);
free(tmp_not_contains);
}
static void password_check(const char *username, const char *password)
{
int pass_total_special = 0;
int pass_total_digit = 0;
int pass_total_upper = 0;
int pass_total_lower = 0;
char *tmp_pass = NULL;
char *tmp_user = NULL;
char *tmp_contains = NULL;
char *tmp_not_contains = NULL;
/* checks has to be done by ignoring case */
if (password_ignore_case)
{
tmp_pass = to_nlower(password, INT_MAX);
tmp_user = to_nlower(username, INT_MAX);
tmp_contains = to_nlower(password_contain, INT_MAX);
tmp_not_contains = to_nlower(password_not_contain, INT_MAX);
}
else
{
tmp_pass = strndup(password, INT_MAX);
tmp_user = strndup(username, INT_MAX);
tmp_contains = strndup(password_contain, INT_MAX);
tmp_not_contains = strndup(password_not_contain, INT_MAX);
}
/* Rule 1: password length */
if (strnlen(tmp_pass, INT_MAX) < password_min_length)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("password length should match the configured %s"),
"credcheck.password_min_length")));
goto clean;
}
/* Rule 2: password contains username */
if (password_contain_username)
{
if (strstr(tmp_pass, tmp_user))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("password should not contain username"))));
goto clean;
}
}
/* Rule 3: contain characters */
if (tmp_contains != NULL && strlen(tmp_contains) > 0)
{
if (str_contains(tmp_contains, tmp_pass) == false)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("password does not contain the configured %s characters"),
"credcheck.password_contain")));
goto clean;
}
}
/* Rule 4: not contain characters */
if (tmp_not_contains != NULL && strlen(tmp_not_contains) > 0)
{
if (str_contains(tmp_not_contains, tmp_pass) == true)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg(gettext_noop("password contains the configured %s unauthorized characters"),
"credcheck.password_not_contain")));
goto clean;
}
}
check_str_counters(tmp_pass, &pass_total_lower, &pass_total_upper,
&pass_total_digit, &pass_total_special);
/* Rule 5: total upper characters */
if (!password_ignore_case && pass_total_upper < password_min_upper)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("password does not contain the configured %s characters",
"credcheck.password_min_upper")));
goto clean;
}
/* Rule 6: total lower characters */
if (!password_ignore_case && pass_total_lower < password_min_lower)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("password does not contain the configured %s characters",
"credcheck.password_min_lower")));
goto clean;
}
/* Rule 7: total digits */
if (pass_total_digit < password_min_digit)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("password does not contain the configured %s characters",
"credcheck.password_min_digit")));
goto clean;
}
/* Rule 8: total special */
if (pass_total_special < password_min_special)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("password does not contain the configured %s characters",
"credcheck.password_min_special")));
goto clean;
}
/* Rule 9: minimum char repeat */
if (password_min_repeat)
{
if (char_repeat_exceeds(tmp_pass, password_min_repeat))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_AUTHORIZATION_SPECIFICATION),
errmsg("%s characters are repeated more than the "
"configured %s times", "password", "credcheck.password_min_repeat")));
goto clean;
}
}
clean:
free(tmp_pass);
free(tmp_user);
free(tmp_contains);
free(tmp_not_contains);
}
static void
username_guc()
{
DefineCustomIntVariable("credcheck.username_min_length",
gettext_noop("minimum username length"), NULL,
&username_min_length, 1, 1, INT_MAX, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.username_min_special",
gettext_noop("minimum username special characters"),
NULL, &username_min_special, 0, 0, INT_MAX,
PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.username_min_digit",
gettext_noop("minimum username digits"), NULL,
&username_min_digit, 0, 0, INT_MAX, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.username_min_upper",
gettext_noop("minimum username uppercase letters"),
NULL, &username_min_upper, 0, 0, INT_MAX, PGC_SUSET,
0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.username_min_lower",
gettext_noop("minimum username lowercase letters"),
NULL, &username_min_lower, 0, 0, INT_MAX, PGC_SUSET,
0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.username_min_repeat",
gettext_noop("minimum username characters repeat"),
NULL, &username_min_repeat, 0, 0, INT_MAX,
PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomBoolVariable("credcheck.username_contain_password",
gettext_noop("username contains password"), NULL,
&username_contain_password, true, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomBoolVariable("credcheck.username_ignore_case",
gettext_noop("ignore case while username checking"),
NULL, &username_ignore_case, false, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomStringVariable(
"credcheck.username_not_contain",
gettext_noop("username should not contain these characters"), NULL,
&username_not_contain, "", PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomStringVariable(
"credcheck.username_contain",
gettext_noop("password should contain these characters"), NULL,
&username_contain, "", PGC_SUSET, 0, NULL, NULL, NULL);
}
static void
password_guc()
{
DefineCustomIntVariable("credcheck.password_min_length",
gettext_noop("minimum password length"), NULL,
&password_min_length, 1, 1, INT_MAX, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_min_special",
gettext_noop("minimum special characters"), NULL,
&password_min_special, 0, 0, INT_MAX, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_min_digit",
gettext_noop("minimum password digits"), NULL,
&password_min_digit, 0, 0, INT_MAX, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_min_upper",
gettext_noop("minimum password uppercase letters"),
NULL, &password_min_upper, 0, 0, INT_MAX, PGC_SUSET,
0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_min_lower",
gettext_noop("minimum password lowercase letters"),
NULL, &password_min_lower, 0, 0, INT_MAX, PGC_SUSET,
0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_min_repeat",
gettext_noop("minimum password characters repeat"),
NULL, &password_min_repeat, 0, 0, INT_MAX,
PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomBoolVariable("credcheck.password_contain_username",
gettext_noop("password contains username"), NULL,
&password_contain_username, true, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomBoolVariable("credcheck.password_ignore_case",
gettext_noop("ignore case while password checking"),
NULL, &password_ignore_case, false, PGC_SUSET, 0,
NULL, NULL, NULL);
DefineCustomStringVariable(
"credcheck.password_not_contain",
gettext_noop("password should not contain these characters"), NULL,
&password_not_contain, "", PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomStringVariable(
"credcheck.password_contain",
gettext_noop("password should contain these characters"), NULL,
&password_contain, "", PGC_SUSET, 0, NULL, NULL, NULL);
#if PG_VERSION_NUM >= 120000
DefineCustomIntVariable("credcheck.password_reuse_history",
gettext_noop("minimum number of password changes before permitting reuse"),
NULL, &password_reuse_history, 0, 0, 100,
PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_reuse_interval",
gettext_noop("minimum number of days elapsed before permitting reuse"),
NULL, &password_reuse_interval, 0, 0, 730, /* max 2 years */
PGC_SUSET, 0, NULL, NULL, NULL);
#endif
DefineCustomIntVariable("credcheck.password_valid_until",
gettext_noop("force use of VALID UNTIL clause in CREATE ROLE statement"
" with a minimum number of days"),
NULL, &password_valid_until, 0, 0, INT_MAX,
PGC_SUSET, 0, NULL, NULL, NULL);
DefineCustomIntVariable("credcheck.password_valid_max",
gettext_noop("force use of VALID UNTIL clause in CREATE ROLE statement"
" with a maximum number of days"),
NULL, &password_valid_max, 0, 0, INT_MAX,
PGC_SUSET, 0, NULL, NULL, NULL);
}
#if PG_VERSION_NUM >= 120000
static void
save_password_in_history(const char *username, const char *password)
{
char *encrypted_password;
pgphHashKey key;
pgphEntry *entry;
TimestampTz dt_now = GetCurrentTimestamp();
Assert(username != NULL);
Assert(password != NULL);
if (password_reuse_history == 0 && password_reuse_interval == 0)
return;
/* Safety check... */
if (!pgph || !pgph_hash)
return;
/* Encrypt the password to the requested format. */
encrypted_password = strdup(str_to_sha256(password, username));
/* Store the password into share memory and password history file */
/* Set up key for hashtable search */
strcpy(key.rolename, username) ;
strcpy(key.password_hash, encrypted_password);
/* Lookup the hash table entry with exclusive lock. */
LWLockAcquire(pgph->lock, LW_EXCLUSIVE);
/* Create new entry, if not present */
entry = (pgphEntry *) hash_search(pgph_hash, &key, HASH_FIND, NULL);
if (!entry)
{
dt_now = GetCurrentTimestamp();
elog(DEBUG1, "Add new entry in history hash table: (%s, '%s', '%s')",
username, encrypted_password,
timestamptz_to_str(dt_now));
/* OK to create a new hashtable entry */
entry = pgph_entry_alloc(&key, dt_now);
/* Flush the new entry to disk */
if (entry)
{
elog(DEBUG1, "entry added, flush change to disk");
flush_password_history();
}
}
LWLockRelease(pgph->lock);
free(encrypted_password);
}
static void
rename_user_in_history(const char *username, const char *newname)
{
pgphEntry *entry;
HASH_SEQ_STATUS hash_seq;
int num_changed = 0;
if (password_reuse_history == 0 && password_reuse_interval == 0)
return;
Assert(username != NULL);
Assert(newname != NULL);
/* Safety check ... shouldn't get here unless shmem is set up. */
if (!pgph || !pgph_hash)
return;
elog(DEBUG1, "renaming user %s to %s into password history", username, newname);
LWLockAcquire(pgph->lock, LW_EXCLUSIVE);
hash_seq_init(&hash_seq, pgph_hash);
while ((entry = hash_seq_search(&hash_seq)) != NULL)
{
/* update the key of matching entries */
if (strcmp(entry->key.rolename, username) == 0)
{
pgphHashKey key;
strcpy(key.rolename, newname) ;
strcpy(key.password_hash, entry->key.password_hash);
hash_update_hash_key(pgph_hash, entry, &key);
num_changed++;
}
}
if (num_changed > 0)
{
elog(DEBUG1, "%d entries in paswword history hash table have been mofidied for user %s",
num_changed,
username);
/* Flush the new entry to disk */
flush_password_history();
}
LWLockRelease(pgph->lock);
}
/*
* qsort comparator for sorting into increasing usage order
*/
static int
entry_cmp(const void *lhs, const void *rhs)
{
TimestampTz l_password_date = (*(pgphEntry *const *) lhs)->password_date;
TimestampTz r_password_date = (*(pgphEntry *const *) rhs)->password_date;
if (l_password_date < r_password_date)
return -1;
else if (l_password_date > r_password_date)
return +1;
else
return 0;
}
static void
remove_password_from_history(const char *username, const char *password, int numentries)
{
char *encrypted_password;
int32 num_entries;
int32 num_user_entries = 0;
int32 num_removed = 0;
pgphEntry *entry;
HASH_SEQ_STATUS hash_seq;
pgphEntry **entries;
int i = 0;
if (password_reuse_history == 0 && password_reuse_interval == 0)
return;
Assert(username != NULL);
Assert(password != NULL);
/* Safety check ... shouldn't get here unless shmem is set up. */
if (!pgph || !pgph_hash)
return;
/* Encrypt the password to the requested format. */
encrypted_password = strdup(str_to_sha256(password, username));
elog(DEBUG1, "attempting to remove historized password = '%s' for user = '%s'", encrypted_password, username);
LWLockAcquire(pgph->lock, LW_EXCLUSIVE);
num_entries = hash_get_num_entries(pgph_hash);
hash_seq_init(&hash_seq, pgph_hash);
entries = palloc(num_entries * sizeof(pgphEntry *));
/* stores entries related to the username to be sorted by date */
while ((entry = hash_seq_search(&hash_seq)) != NULL)
{
if (strcmp(entry->key.rolename, username) == 0)
entries[i++] = entry;
}
if (i == 0)
{
elog(DEBUG1, "no entry in the history for user: %s", username);
LWLockRelease(pgph->lock);
pfree(entries);
return;
}
num_user_entries = i;
/* Sort into increasing order by date */
qsort(entries, i, sizeof(pgphEntry *), entry_cmp);
/*
* Remove the oldest tuples when password_reuse_history is reached
* until password_reuse_history size is respected for this user,
* except if password_reuse_interval is enabled and not reached.
*
* A ascending index must exits on the date column of the table,
* we use this index to treat the oldest entries first in the scan.
*/
for (i = 0; i < num_user_entries; i++)
{
bool keep = false;
/* if we have a retention delay remove entries that has expired */
if (password_reuse_interval > 0)
{
TimestampTz dt_now = GetCurrentTimestamp();
float8 result;
result = ((float8) (dt_now - entries[i]->password_date)) / 1000000.0; /* in seconds */
result /= 86400; /* in days */
elog(DEBUG1, "password_reuse_interval: %d, entry age: %d",
password_reuse_interval,
(int) result);
/*
* When the delay have not expired, keep the entry if the
* number of entry exceed password_reuse_history
*/
if (password_reuse_interval >= (int) result)
keep = true;
else
elog(DEBUG1, "remove_password_from_history(): this history entry has expired");
}
if (!keep)
{
/* we need to remove the entries that exceed history size */
if ((num_user_entries - i) >= password_reuse_history)
{
elog(DEBUG1, "removing entry %d from the history (%s, %s)", i,
entries[i]->key.rolename,
entries[i]->key.password_hash);
hash_search(pgph_hash, &entries[i]->key, HASH_REMOVE, NULL);
num_removed++;
}
}
}
pfree(entries);
/* Flush the new entry to disk */
if (num_removed > 0)
flush_password_history();
LWLockRelease(pgph->lock);
}
static void
remove_user_from_history(const char *username)
{
int32 num_removed = 0;
pgphEntry *entry;
HASH_SEQ_STATUS hash_seq;
if (password_reuse_history == 0 && password_reuse_interval == 0)
return;
Assert(username != NULL);
/* Safety check ... shouldn't get here unless shmem is set up. */
if (!pgph || !pgph_hash)
return;
elog(DEBUG1, "removing user %s from password history", username);
/* Lookup the hash table entry with exclusive lock. */