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pgcrypto: Detect and report too-short crypt() salts.
Certain short salts crashed the backend or disclosed a few bytes of backend memory. For existing salt-induced error conditions, emit a message saying as much. Back-patch to 9.0 (all supported versions). Josh Kupershmidt Security: CVE-2015-5288
This commit is contained in:
Noah Misch
parent
e07cfef34d
commit
56232f9879
@ -602,6 +602,17 @@ _crypt_blowfish_rn(const char *key, const char *setting,
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if (size < 7 + 22 + 31 + 1)
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return NULL;
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/*
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* Blowfish salt value must be formatted as follows: "$2a$" or "$2x$", a
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* two digit cost parameter, "$", and 22 digits from the alphabet
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* "./0-9A-Za-z". -- from the PHP crypt docs. Apparently we enforce a few
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* more restrictions on the count in the salt as well.
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*/
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if (strlen(setting) < 29)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid salt")));
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if (setting[0] != '$' ||
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setting[1] != '2' ||
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(setting[2] != 'a' && setting[2] != 'x') ||
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@ -611,14 +622,18 @@ _crypt_blowfish_rn(const char *key, const char *setting,
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(setting[4] == '3' && setting[5] > '1') ||
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setting[6] != '$')
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{
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return NULL;
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid salt")));
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}
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count = (BF_word) 1 << ((setting[4] - '0') * 10 + (setting[5] - '0'));
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if (count < 16 || BF_decode(data.binary.salt, &setting[7], 16))
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{
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px_memset(data.binary.salt, 0, sizeof(data.binary.salt));
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return NULL;
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid salt")));
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}
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BF_swap(data.binary.salt, 4);
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@ -681,9 +681,19 @@ px_crypt_des(const char *key, const char *setting)
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if (*setting == _PASSWORD_EFMT1)
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{
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/*
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* "new"-style: setting - underscore, 4 bytes of count, 4 bytes of
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* salt key - unlimited characters
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* "new"-style: setting must be a 9-character (underscore, then 4
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* bytes of count, then 4 bytes of salt) string. See CRYPT(3) under
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* the "Extended crypt" heading for further details.
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*
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* Unlimited characters of the input key are used. This is known as
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* the "Extended crypt" DES method.
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*
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*/
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if (strlen(setting) < 9)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid salt")));
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for (i = 1, count = 0L; i < 5; i++)
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count |= ascii_to_bin(setting[i]) << (i - 1) * 6;
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@ -723,10 +733,16 @@ px_crypt_des(const char *key, const char *setting)
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#endif /* !DISABLE_XDES */
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{
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/*
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* "old"-style: setting - 2 bytes of salt key - up to 8 characters
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* "old"-style: setting - 2 bytes of salt key - only up to the first 8
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* characters of the input key are used.
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*/
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count = 25;
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if (strlen(setting) < 2)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid salt")));
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salt = (ascii_to_bin(setting[1]) << 6)
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| ascii_to_bin(setting[0]);
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@ -13,6 +13,15 @@ SELECT crypt('foox', '$2a$06$RQiOJ.3ELirrXwxIZY8q0O');
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$2a$06$RQiOJ.3ELirrXwxIZY8q0OR3CVJrAfda1z26CCHPnB6mmVZD8p0/C
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(1 row)
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-- error, salt too short:
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SELECT crypt('foox', '$2a$');
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ERROR: invalid salt
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-- error, first digit of count in salt invalid
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SELECT crypt('foox', '$2a$40$RQiOJ.3ELirrXwxIZY8q0O');
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ERROR: invalid salt
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-- error, count in salt too small
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SELECT crypt('foox', '$2a$00$RQiOJ.3ELirrXwxIZY8q0O');
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ERROR: invalid salt
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CREATE TABLE ctest (data text, res text, salt text);
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INSERT INTO ctest VALUES ('password', '', '');
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UPDATE ctest SET salt = gen_salt('bf', 8);
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@ -13,6 +13,10 @@ SELECT crypt('foox', 'NB');
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NB53EGGqrrb5E
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(1 row)
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-- We are supposed to pass in a 2-character salt.
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-- error since salt is too short:
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SELECT crypt('password', 'a');
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ERROR: invalid salt
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CREATE TABLE ctest (data text, res text, salt text);
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INSERT INTO ctest VALUES ('password', '', '');
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UPDATE ctest SET salt = gen_salt('des');
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@ -13,6 +13,30 @@ SELECT crypt('foox', '_J9..j2zz');
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_J9..j2zzAYKMvO2BYRY
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(1 row)
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-- check XDES handling of keys longer than 8 chars
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SELECT crypt('longlongpassword', '_J9..j2zz');
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crypt
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----------------------
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_J9..j2zz4BeseiQNwUg
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(1 row)
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-- error, salt too short
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SELECT crypt('foox', '_J9..BWH');
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ERROR: invalid salt
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-- error, count specified in the second argument is 0
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SELECT crypt('password', '_........');
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ERROR: crypt(3) returned NULL
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-- error, count will wind up still being 0 due to invalid encoding
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-- of the count: only chars ``./0-9A-Za-z' are valid
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SELECT crypt('password', '_..!!!!!!');
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ERROR: crypt(3) returned NULL
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-- count should be non-zero here, will work
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SELECT crypt('password', '_/!!!!!!!');
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crypt
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----------------------
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_/!!!!!!!zqM49hRzxko
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(1 row)
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CREATE TABLE ctest (data text, res text, salt text);
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INSERT INTO ctest VALUES ('password', '', '');
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UPDATE ctest SET salt = gen_salt('xdes', 1001);
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@ -42,7 +42,7 @@ run_crypt_des(const char *psw, const char *salt,
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char *res;
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res = px_crypt_des(psw, salt);
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if (strlen(res) > len - 1)
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if (res == NULL || strlen(res) > len - 1)
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return NULL;
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strcpy(buf, res);
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return buf;
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@ -6,6 +6,15 @@ SELECT crypt('', '$2a$06$RQiOJ.3ELirrXwxIZY8q0O');
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SELECT crypt('foox', '$2a$06$RQiOJ.3ELirrXwxIZY8q0O');
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-- error, salt too short:
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SELECT crypt('foox', '$2a$');
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-- error, first digit of count in salt invalid
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SELECT crypt('foox', '$2a$40$RQiOJ.3ELirrXwxIZY8q0O');
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-- error, count in salt too small
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SELECT crypt('foox', '$2a$00$RQiOJ.3ELirrXwxIZY8q0O');
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CREATE TABLE ctest (data text, res text, salt text);
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INSERT INTO ctest VALUES ('password', '', '');
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@ -6,6 +6,10 @@ SELECT crypt('', 'NB');
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SELECT crypt('foox', 'NB');
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-- We are supposed to pass in a 2-character salt.
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-- error since salt is too short:
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SELECT crypt('password', 'a');
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CREATE TABLE ctest (data text, res text, salt text);
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INSERT INTO ctest VALUES ('password', '', '');
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@ -6,6 +6,22 @@ SELECT crypt('', '_J9..j2zz');
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SELECT crypt('foox', '_J9..j2zz');
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-- check XDES handling of keys longer than 8 chars
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SELECT crypt('longlongpassword', '_J9..j2zz');
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-- error, salt too short
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SELECT crypt('foox', '_J9..BWH');
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-- error, count specified in the second argument is 0
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SELECT crypt('password', '_........');
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-- error, count will wind up still being 0 due to invalid encoding
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-- of the count: only chars ``./0-9A-Za-z' are valid
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SELECT crypt('password', '_..!!!!!!');
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-- count should be non-zero here, will work
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SELECT crypt('password', '_/!!!!!!!');
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CREATE TABLE ctest (data text, res text, salt text);
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INSERT INTO ctest VALUES ('password', '', '');
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