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Code Issues Releases Wiki Activity

Improve error handling of cryptohash computations 

The existing cryptohash facility was causing problems in some code paths
related to MD5 (frontend and backend) that relied on the fact that the
only type of error that could happen would be an OOM, as the MD5
implementation used in PostgreSQL ~13 (the in-core implementation is
used when compiling with or without OpenSSL in those older versions),
could fail only under this circumstance.

The new cryptohash facilities can fail for reasons other than OOMs, like
attempting MD5 when FIPS is enabled (upstream OpenSSL allows that up to
1.0.2, Fedora and Photon patch OpenSSL 1.1.1 to allow that), so this
would cause incorrect reports to show up.

This commit extends the cryptohash APIs so as callers of those routines
can fetch more context when an error happens, by using a new routine
called pg_cryptohash_error().  The error states are stored within each
implementation's internal context data, so as it is possible to extend
the logic depending on what's suited for an implementation.  The default
implementation requires few error states, but OpenSSL could report
various issues depending on its internal state so more is needed in
cryptohash_openssl.c, and the code is shaped so as we are always able to
grab the necessary information.

The core code is changed to adapt to the new error routine, painting
more "const" across the call stack where the static errors are stored,
particularly in authentication code paths on variables that provide
log details.  This way, any future changes would warn if attempting to
free these strings.  The MD5 authentication code was also a bit blurry
about the handling of "logdetail" (LOG sent to the postmaster), so
improve the comments related that, while on it.

The origin of the problem is 87ae969, that introduced the centralized
cryptohash facility.  Extra changes are done for pgcrypto in v14 for the
non-OpenSSL code path to cope with the improvements done by this
commit.

Reported-by: Michael Mühlbeyer
Author: Michael Paquier
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/89B7F072-5BBE-4C92-903E-D83E865D9367@trivadis.com
Backpatch-through: 14
This commit is contained in:
Michael Paquier 2022-01-11 09:55:16 +09:00
parent 9ef2c65555
commit b69aba7457
18 changed files with 275 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
contrib/passwordcheck/passwordcheck.c
View File

@ -74,7 +74,7 @@ check_password(const char *username,
*
* We only check for username = password.
*/
char *logdetail;
const char *logdetail = NULL;
if (plain_crypt_verify(username, shadow_pass, username, &logdetail) == STATUS_OK)
ereport(ERROR,

18
contrib/uuid-ossp/uuid-ossp.c
View File

@ -319,14 +319,17 @@ uuid_generate_internal(int v, unsigned char *ns, const char *ptr, int len)
pg_cryptohash_ctx *ctx = pg_cryptohash_create(PG_MD5);
if (pg_cryptohash_init(ctx) < 0)
elog(ERROR, "could not initialize %s context", "MD5");
elog(ERROR, "could not initialize %s context: %s", "MD5",
pg_cryptohash_error(ctx));
if (pg_cryptohash_update(ctx, ns, sizeof(uu)) < 0 ||
pg_cryptohash_update(ctx, (unsigned char *) ptr, len) < 0)
elog(ERROR, "could not update %s context", "MD5");
elog(ERROR, "could not update %s context: %s", "MD5",
pg_cryptohash_error(ctx));
/* we assume sizeof MD5 result is 16, same as UUID size */
if (pg_cryptohash_final(ctx, (unsigned char *) &uu,
sizeof(uu)) < 0)
elog(ERROR, "could not finalize %s context", "MD5");
elog(ERROR, "could not finalize %s context: %s", "MD5",
pg_cryptohash_error(ctx));
pg_cryptohash_free(ctx);
}
else
@ -335,12 +338,15 @@ uuid_generate_internal(int v, unsigned char *ns, const char *ptr, int len)
unsigned char sha1result[SHA1_DIGEST_LENGTH];
if (pg_cryptohash_init(ctx) < 0)
elog(ERROR, "could not initialize %s context", "SHA1");
elog(ERROR, "could not initialize %s context: %s", "SHA1",
pg_cryptohash_error(ctx));
if (pg_cryptohash_update(ctx, ns, sizeof(uu)) < 0 ||
pg_cryptohash_update(ctx, (unsigned char *) ptr, len) < 0)
elog(ERROR, "could not update %s context", "SHA1");
elog(ERROR, "could not update %s context: %s", "SHA1",
pg_cryptohash_error(ctx));
if (pg_cryptohash_final(ctx, sha1result, sizeof(sha1result)) < 0)
elog(ERROR, "could not finalize %s context", "SHA1");
elog(ERROR, "could not finalize %s context: %s", "SHA1",
pg_cryptohash_error(ctx));
pg_cryptohash_free(ctx);
memcpy(&uu, sha1result, sizeof(uu));

4
src/backend/commands/user.c
View File

@ -355,7 +355,7 @@ CreateRole(ParseState *pstate, CreateRoleStmt *stmt)
if (password)
{
char *shadow_pass;
char *logdetail;
const char *logdetail = NULL;
/*
* Don't allow an empty password. Libpq treats an empty password the
@ -775,7 +775,7 @@ AlterRole(ParseState *pstate, AlterRoleStmt *stmt)
if (password)
{
char *shadow_pass;
char *logdetail;
const char *logdetail = NULL;
/* Like in CREATE USER, don't allow an empty password. */
if (password[0] == '\0' ||

2
src/backend/libpq/auth-sasl.c
View File

@ -50,7 +50,7 @@
*/
int
CheckSASLAuth(const pg_be_sasl_mech *mech, Port *port, char *shadow_pass,
char **logdetail)
const char **logdetail)
{
StringInfoData sasl_mechs;
int mtype;

5
src/backend/libpq/auth-scram.c
View File

@ -111,7 +111,8 @@ static void scram_get_mechanisms(Port *port, StringInfo buf);
static void *scram_init(Port *port, const char *selected_mech,
const char *shadow_pass);
static int scram_exchange(void *opaq, const char *input, int inputlen,
char **output, int *outputlen, char **logdetail);
char **output, int *outputlen,
const char **logdetail);
/* Mechanism declaration */
const pg_be_sasl_mech pg_be_scram_mech = {
@ -335,7 +336,7 @@ scram_init(Port *port, const char *selected_mech, const char *shadow_pass)
*/
static int
scram_exchange(void *opaq, const char *input, int inputlen,
char **output, int *outputlen, char **logdetail)
char **output, int *outputlen, const char **logdetail)
{
scram_state *state = (scram_state *) opaq;
int result;

33
src/backend/libpq/auth.c
View File

@ -45,7 +45,7 @@
* Global authentication functions
*----------------------------------------------------------------
*/
static void auth_failed(Port *port, int status, char *logdetail);
static void auth_failed(Port *port, int status, const char *logdetail);
static char *recv_password_packet(Port *port);
static void set_authn_id(Port *port, const char *id);
@ -54,10 +54,11 @@ static void set_authn_id(Port *port, const char *id);
* Password-based authentication methods (password, md5, and scram-sha-256)
*----------------------------------------------------------------
*/
static int CheckPasswordAuth(Port *port, char **logdetail);
static int CheckPWChallengeAuth(Port *port, char **logdetail);
static int CheckPasswordAuth(Port *port, const char **logdetail);
static int CheckPWChallengeAuth(Port *port, const char **logdetail);
static int CheckMD5Auth(Port *port, char *shadow_pass, char **logdetail);
static int CheckMD5Auth(Port *port, char *shadow_pass,
const char **logdetail);
/*----------------------------------------------------------------
@ -247,7 +248,7 @@ ClientAuthentication_hook_type ClientAuthentication_hook = NULL;
* particular, if logdetail isn't NULL, we send that string to the log.
*/
static void
auth_failed(Port *port, int status, char *logdetail)
auth_failed(Port *port, int status, const char *logdetail)
{
const char *errstr;
char *cdetail;
@ -383,7 +384,7 @@ void
ClientAuthentication(Port *port)
{
int status = STATUS_ERROR;
char *logdetail = NULL;
const char *logdetail = NULL;
/*
* Get the authentication method to use for this frontend/database
@ -769,7 +770,7 @@ recv_password_packet(Port *port)
* Plaintext password authentication.
*/
static int
CheckPasswordAuth(Port *port, char **logdetail)
CheckPasswordAuth(Port *port, const char **logdetail)
{
char *passwd;
int result;
@ -804,7 +805,7 @@ CheckPasswordAuth(Port *port, char **logdetail)
* MD5 and SCRAM authentication.
*/
static int
CheckPWChallengeAuth(Port *port, char **logdetail)
CheckPWChallengeAuth(Port *port, const char **logdetail)
{
int auth_result;
char *shadow_pass;
@ -866,7 +867,7 @@ CheckPWChallengeAuth(Port *port, char **logdetail)
}
static int
CheckMD5Auth(Port *port, char *shadow_pass, char **logdetail)
CheckMD5Auth(Port *port, char *shadow_pass, const char **logdetail)
{
char md5Salt[4]; /* Password salt */
char *passwd;
@ -3085,6 +3086,8 @@ PerformRadiusTransaction(const char *server, const char *secret, const char *por
md5trailer = packet->vector;
for (i = 0; i < encryptedpasswordlen; i += RADIUS_VECTOR_LENGTH)
{
const char *errstr = NULL;
memcpy(cryptvector + strlen(secret), md5trailer, RADIUS_VECTOR_LENGTH);
/*
@ -3093,10 +3096,12 @@ PerformRadiusTransaction(const char *server, const char *secret, const char *por
*/
md5trailer = encryptedpassword + i;
if (!pg_md5_binary(cryptvector, strlen(secret) + RADIUS_VECTOR_LENGTH, encryptedpassword + i))
if (!pg_md5_binary(cryptvector, strlen(secret) + RADIUS_VECTOR_LENGTH,
encryptedpassword + i, &errstr))
{
ereport(LOG,
(errmsg("could not perform MD5 encryption of password")));
(errmsg("could not perform MD5 encryption of password: %s",
errstr)));
pfree(cryptvector);
pg_freeaddrinfo_all(hint.ai_family, serveraddrs);
return STATUS_ERROR;
@ -3181,6 +3186,7 @@ PerformRadiusTransaction(const char *server, const char *secret, const char *por
struct timeval timeout;
struct timeval now;
int64 timeoutval;
const char *errstr = NULL;
gettimeofday(&now, NULL);
timeoutval = (endtime.tv_sec * 1000000 + endtime.tv_usec) - (now.tv_sec * 1000000 + now.tv_usec);
@ -3299,10 +3305,11 @@ PerformRadiusTransaction(const char *server, const char *secret, const char *por
if (!pg_md5_binary(cryptvector,
packetlength + strlen(secret),
encryptedpassword))
encryptedpassword, &errstr))
{
ereport(LOG,
(errmsg("could not perform MD5 encryption of received packet")));
(errmsg("could not perform MD5 encryption of received packet: %s",
errstr)));
pfree(cryptvector);
continue;
}

38
src/backend/libpq/crypt.c
View File

@ -34,7 +34,7 @@
* sent to the client, to avoid giving away user information!
*/
char *
get_role_password(const char *role, char **logdetail)
get_role_password(const char *role, const char **logdetail)
{
TimestampTz vuntil = 0;
HeapTuple roleTup;
@ -116,6 +116,7 @@ encrypt_password(PasswordType target_type, const char *role,
{
PasswordType guessed_type = get_password_type(password);
char *encrypted_password;
const char *errstr = NULL;
if (guessed_type != PASSWORD_TYPE_PLAINTEXT)
{
@ -132,8 +133,8 @@ encrypt_password(PasswordType target_type, const char *role,
encrypted_password = palloc(MD5_PASSWD_LEN + 1);
if (!pg_md5_encrypt(password, role, strlen(role),
encrypted_password))
elog(ERROR, "password encryption failed");
encrypted_password, &errstr))
elog(ERROR, "password encryption failed: %s", errstr);
return encrypted_password;
case PASSWORD_TYPE_SCRAM_SHA_256:
@ -159,17 +160,18 @@ encrypt_password(PasswordType target_type, const char *role,
* 'client_pass' is the response given by the remote user to the MD5 challenge.
* 'md5_salt' is the salt used in the MD5 authentication challenge.
*
* In the error case, optionally store a palloc'd string at *logdetail
* that will be sent to the postmaster log (but not the client).
* In the error case, save a string at *logdetail that will be sent to the
* postmaster log (but not the client).
*/
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)
const char **logdetail)
{
int retval;
char crypt_pwd[MD5_PASSWD_LEN + 1];
const char *errstr = NULL;
Assert(md5_salt_len > 0);
@ -183,16 +185,13 @@ md5_crypt_verify(const char *role, const char *shadow_pass,
/*
* Compute the correct answer for the MD5 challenge.
*
* We do not bother setting logdetail for any pg_md5_encrypt failure
* below: the only possible error is out-of-memory, which is unlikely, and
* if it did happen adding a psprintf call would only make things worse.
*/
/* stored password already encrypted, only do salt */
if (!pg_md5_encrypt(shadow_pass + strlen("md5"),
md5_salt, md5_salt_len,
crypt_pwd))
crypt_pwd, &errstr))
{
*logdetail = errstr;
return STATUS_ERROR;
}
@ -215,15 +214,16 @@ md5_crypt_verify(const char *role, const char *shadow_pass,
* pg_authid.rolpassword.
* 'client_pass' is the password given by the remote user.
*
* In the error case, optionally store a palloc'd string at *logdetail
* that will be sent to the postmaster log (but not the client).
* In the error case, store a string at *logdetail that will be sent to the
* postmaster log (but not the client).
*/
int
plain_crypt_verify(const char *role, const char *shadow_pass,
const char *client_pass,
char **logdetail)
const char **logdetail)
{
char crypt_client_pass[MD5_PASSWD_LEN + 1];
const char *errstr = NULL;
/*
* Client sent password in plaintext. If we have an MD5 hash stored, hash
@ -251,14 +251,10 @@ plain_crypt_verify(const char *role, const char *shadow_pass,
if (!pg_md5_encrypt(client_pass,
role,
strlen(role),
crypt_client_pass))
crypt_client_pass,
&errstr))
{
/*
* We do not bother setting logdetail for pg_md5_encrypt
* failure: the only possible error is out-of-memory, which is
* unlikely, and if it did happen adding a psprintf call would
* only make things worse.
*/
*logdetail = errstr;
return STATUS_ERROR;
}
if (strcmp(crypt_client_pass, shadow_pass) == 0)

11
src/backend/replication/backup_manifest.c
View File

@ -68,7 +68,8 @@ InitializeBackupManifest(backup_manifest_info *manifest,
manifest->buffile = BufFileCreateTemp(false);
manifest->manifest_ctx = pg_cryptohash_create(PG_SHA256);
if (pg_cryptohash_init(manifest->manifest_ctx) < 0)
elog(ERROR, "failed to initialize checksum of backup manifest");
elog(ERROR, "failed to initialize checksum of backup manifest: %s",
pg_cryptohash_error(manifest->manifest_ctx));
}
manifest->manifest_size = UINT64CONST(0);
@ -311,7 +312,7 @@ AddWALInfoToBackupManifest(backup_manifest_info *manifest, XLogRecPtr startptr,
* Finalize the backup manifest, and send it to the client.
*/
void
SendBackupManifest(backup_manifest_info *manifest, bbsink *sink)
SendBackupManifest(backup_manifest_info *manifest, bbsink * sink)
{
uint8 checksumbuf[PG_SHA256_DIGEST_LENGTH];
char checksumstringbuf[PG_SHA256_DIGEST_STRING_LENGTH];
@ -334,7 +335,8 @@ SendBackupManifest(backup_manifest_info *manifest, bbsink *sink)
manifest->still_checksumming = false;
if (pg_cryptohash_final(manifest->manifest_ctx, checksumbuf,
sizeof(checksumbuf)) < 0)
elog(ERROR, "failed to finalize checksum of backup manifest");
elog(ERROR, "failed to finalize checksum of backup manifest: %s",
pg_cryptohash_error(manifest->manifest_ctx));
AppendStringToManifest(manifest, "\"Manifest-Checksum\": \"");
hex_encode((char *) checksumbuf, sizeof checksumbuf, checksumstringbuf);
@ -391,7 +393,8 @@ AppendStringToManifest(backup_manifest_info *manifest, char *s)
if (manifest->still_checksumming)
{
if (pg_cryptohash_update(manifest->manifest_ctx, (uint8 *) s, len) < 0)
elog(ERROR, "failed to update checksum of backup manifest");
elog(ERROR, "failed to update checksum of backup manifest: %s",
pg_cryptohash_error(manifest->manifest_ctx));
}
BufFileWrite(manifest->buffile, s, len);
manifest->manifest_size += len;

25
src/backend/utils/adt/cryptohashfuncs.c
View File

@ -35,15 +35,17 @@ md5_text(PG_FUNCTION_ARGS)
text *in_text = PG_GETARG_TEXT_PP(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
const char *errstr = NULL;
/* Calculate the length of the buffer using varlena metadata */
len = VARSIZE_ANY_EXHDR(in_text);
/* get the hash result */
if (pg_md5_hash(VARDATA_ANY(in_text), len, hexsum) == false)
if (pg_md5_hash(VARDATA_ANY(in_text), len, hexsum, &errstr) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("could not compute %s hash: %s", "MD5",
errstr)));
/* convert to text and return it */
PG_RETURN_TEXT_P(cstring_to_text(hexsum));
@ -58,12 +60,14 @@ md5_bytea(PG_FUNCTION_ARGS)
bytea *in = PG_GETARG_BYTEA_PP(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
const char *errstr = NULL;
len = VARSIZE_ANY_EXHDR(in);
if (pg_md5_hash(VARDATA_ANY(in), len, hexsum) == false)
if (pg_md5_hash(VARDATA_ANY(in), len, hexsum, &errstr) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("could not compute %s hash: %s", "MD5",
errstr)));
PG_RETURN_TEXT_P(cstring_to_text(hexsum));
}
@ -111,12 +115,15 @@ cryptohash_internal(pg_cryptohash_type type, bytea *input)
ctx = pg_cryptohash_create(type);
if (pg_cryptohash_init(ctx) < 0)
elog(ERROR, "could not initialize %s context", typestr);
elog(ERROR, "could not initialize %s context: %s", typestr,
pg_cryptohash_error(ctx));
if (pg_cryptohash_update(ctx, data, len) < 0)
elog(ERROR, "could not update %s context", typestr);
elog(ERROR, "could not update %s context: %s", typestr,
pg_cryptohash_error(ctx));
if (pg_cryptohash_final(ctx, (unsigned char *) VARDATA(result),
digest_len) < 0)
elog(ERROR, "could not finalize %s context", typestr);
elog(ERROR, "could not finalize %s context: %s", typestr,
pg_cryptohash_error(ctx));
pg_cryptohash_free(ctx);
SET_VARSIZE(result, digest_len + VARHDRSZ);

57
src/common/cryptohash.c
View File

@ -40,10 +40,18 @@
#define FREE(ptr) free(ptr)
#endif
/* Set of error states */
typedef enum pg_cryptohash_errno
{
PG_CRYPTOHASH_ERROR_NONE = 0,
PG_CRYPTOHASH_ERROR_DEST_LEN
} pg_cryptohash_errno;
/* Internal pg_cryptohash_ctx structure */
struct pg_cryptohash_ctx
{
pg_cryptohash_type type;
pg_cryptohash_errno error;
union
{
@ -76,9 +84,10 @@ pg_cryptohash_create(pg_cryptohash_type type)
ctx = ALLOC(sizeof(pg_cryptohash_ctx));
if (ctx == NULL)
return NULL;
memset(ctx, 0, sizeof(pg_cryptohash_ctx));
ctx->type = type;
ctx->error = PG_CRYPTOHASH_ERROR_NONE;
return ctx;
}
@ -174,32 +183,50 @@ pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
{
case PG_MD5:
if (len < MD5_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
pg_md5_final(&ctx->data.md5, dest);
break;
case PG_SHA1:
if (len < SHA1_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
pg_sha1_final(&ctx->data.sha1, dest);
break;
case PG_SHA224:
if (len < PG_SHA224_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
pg_sha224_final(&ctx->data.sha224, dest);
break;
case PG_SHA256:
if (len < PG_SHA256_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
pg_sha256_final(&ctx->data.sha256, dest);
break;
case PG_SHA384:
if (len < PG_SHA384_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
pg_sha384_final(&ctx->data.sha384, dest);
break;
case PG_SHA512:
if (len < PG_SHA512_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
pg_sha512_final(&ctx->data.sha512, dest);
break;
}
@ -221,3 +248,31 @@ pg_cryptohash_free(pg_cryptohash_ctx *ctx)
explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
FREE(ctx);
}
/*
* pg_cryptohash_error
*
* Returns a static string providing errors about an error that
* happened during a computation.
*/
const char *
pg_cryptohash_error(pg_cryptohash_ctx *ctx)
{
/*
* This implementation would never fail because of an out-of-memory error,
* except when creating the context.
*/
if (ctx == NULL)
return _("out of memory");
switch (ctx->error)
{
case PG_CRYPTOHASH_ERROR_NONE:
return _("success");
case PG_CRYPTOHASH_ERROR_DEST_LEN:
return _("destination buffer too small");
}
Assert(false);
return _("success");
}

93
src/common/cryptohash_openssl.c
View File

@ -21,6 +21,7 @@
#include "postgres_fe.h"
#endif
#include <openssl/err.h>
#include <openssl/evp.h>
#include "common/cryptohash.h"
@ -46,6 +47,14 @@
#define FREE(ptr) free(ptr)
#endif
/* Set of error states */
typedef enum pg_cryptohash_errno
{
PG_CRYPTOHASH_ERROR_NONE = 0,
PG_CRYPTOHASH_ERROR_DEST_LEN,
PG_CRYPTOHASH_ERROR_OPENSSL
} pg_cryptohash_errno;
/*
* Internal pg_cryptohash_ctx structure.
*
@ -55,6 +64,8 @@
struct pg_cryptohash_ctx
{
pg_cryptohash_type type;
pg_cryptohash_errno error;
const char *errreason;
EVP_MD_CTX *evpctx;
@ -63,6 +74,19 @@ struct pg_cryptohash_ctx
#endif
};
static const char *
SSLerrmessage(unsigned long ecode)
{
if (ecode == 0)
return NULL;
/*
* This may return NULL, but we would fall back to a default error path if
* that were the case.
*/
return ERR_reason_error_string(ecode);
}
/*
* pg_cryptohash_create
*
@ -88,6 +112,8 @@ pg_cryptohash_create(pg_cryptohash_type type)
return NULL;
memset(ctx, 0, sizeof(pg_cryptohash_ctx));
ctx->type = type;
ctx->error = PG_CRYPTOHASH_ERROR_NONE;
ctx->errreason = NULL;
/*
* Initialization takes care of assigning the correct type for OpenSSL.
@ -153,7 +179,11 @@ pg_cryptohash_init(pg_cryptohash_ctx *ctx)
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
{
ctx->errreason = SSLerrmessage(ERR_get_error());
ctx->error = PG_CRYPTOHASH_ERROR_OPENSSL;
return -1;
}
return 0;
}
@ -174,7 +204,11 @@ pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
{
ctx->errreason = SSLerrmessage(ERR_get_error());
ctx->error = PG_CRYPTOHASH_ERROR_OPENSSL;
return -1;
}
return 0;
}
@ -195,27 +229,45 @@ pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
{
case PG_MD5:
if (len < MD5_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
break;
case PG_SHA1:
if (len < SHA1_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
break;
case PG_SHA224:
if (len < PG_SHA224_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
break;
case PG_SHA256:
if (len < PG_SHA256_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
break;
case PG_SHA384:
if (len < PG_SHA384_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
break;
case PG_SHA512:
if (len < PG_SHA512_DIGEST_LENGTH)
{
ctx->error = PG_CRYPTOHASH_ERROR_DEST_LEN;
return -1;
}
break;
}
@ -223,7 +275,11 @@ pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
/* OpenSSL internals return 1 on success, 0 on failure */
if (status <= 0)
{
ctx->errreason = SSLerrmessage(ERR_get_error());
ctx->error = PG_CRYPTOHASH_ERROR_OPENSSL;
return -1;
}
return 0;
}
@ -248,3 +304,40 @@ pg_cryptohash_free(pg_cryptohash_ctx *ctx)
explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
FREE(ctx);
}
/*
* pg_cryptohash_error
*
* Returns a static string providing errors about an error that
* happened during a computation.
*/
const char *
pg_cryptohash_error(pg_cryptohash_ctx *ctx)
{
/*
* This implementation would never fail because of an out-of-memory error,
* except when creating the context.
*/
if (ctx == NULL)
return _("out of memory");
/*
* If a reason is provided, rely on it, else fallback to any error code
* set.
*/
if (ctx->errreason)
return ctx->errreason;
switch (ctx->error)
{
case PG_CRYPTOHASH_ERROR_NONE:
return _("success");
case PG_CRYPTOHASH_ERROR_DEST_LEN:
return _("destination buffer too small");
case PG_CRYPTOHASH_ERROR_OPENSSL:
return _("OpenSSL failure");
}
Assert(false); /* cannot be reached */
return _("success");
}

20
src/common/md5_common.c
View File

@ -67,7 +67,7 @@ bytesToHex(uint8 b[16], char *s)
*/
bool
pg_md5_hash(const void *buff, size_t len, char *hexsum)
pg_md5_hash(const void *buff, size_t len, char *hexsum, const char **errstr)
{
uint8 sum[MD5_DIGEST_LENGTH];
pg_cryptohash_ctx *ctx;
@ -80,6 +80,7 @@ pg_md5_hash(const void *buff, size_t len, char *hexsum)
pg_cryptohash_update(ctx, buff, len) < 0 ||
pg_cryptohash_final(ctx, sum, sizeof(sum)) < 0)
{
*errstr = pg_cryptohash_error(ctx);
pg_cryptohash_free(ctx);
return false;
}
@ -90,18 +91,23 @@ pg_md5_hash(const void *buff, size_t len, char *hexsum)
}
bool
pg_md5_binary(const void *buff, size_t len, void *outbuf)
pg_md5_binary(const void *buff, size_t len, void *outbuf, const char **errstr)
{
pg_cryptohash_ctx *ctx;
*errstr = NULL;
ctx = pg_cryptohash_create(PG_MD5);
if (ctx == NULL)
{
*errstr = pg_cryptohash_error(NULL); /* returns OOM */
return false;
}
if (pg_cryptohash_init(ctx) < 0 ||
pg_cryptohash_update(ctx, buff, len) < 0 ||
pg_cryptohash_final(ctx, outbuf, MD5_DIGEST_LENGTH) < 0)
{
*errstr = pg_cryptohash_error(ctx);
pg_cryptohash_free(ctx);
return false;
}
@ -118,11 +124,12 @@ pg_md5_binary(const void *buff, size_t len, void *outbuf)
* Output format is "md5" followed by a 32-hex-digit MD5 checksum.
* Hence, the output buffer "buf" must be at least 36 bytes long.
*
* Returns true if okay, false on error (out of memory).
* Returns true if okay, false on error with *errstr providing some
* error context.
*/
bool
pg_md5_encrypt(const char *passwd, const char *salt, size_t salt_len,
char *buf)
char *buf, const char **errstr)
{
size_t passwd_len = strlen(passwd);
@ -131,7 +138,10 @@ pg_md5_encrypt(const char *passwd, const char *salt, size_t salt_len,
bool ret;
if (!crypt_buf)
{
*errstr = _("out of memory");
return false;
}
/*
* Place salt at the end because it may be known by users trying to crack
@ -141,7 +151,7 @@ pg_md5_encrypt(const char *passwd, const char *salt, size_t salt_len,
memcpy(crypt_buf + passwd_len, salt, salt_len);
strcpy(buf, "md5");
ret = pg_md5_hash(crypt_buf, passwd_len + salt_len, buf + 3);
ret = pg_md5_hash(crypt_buf, passwd_len + salt_len, buf + 3, errstr);
free(crypt_buf);

1
src/include/common/cryptohash.h
View File

@ -34,5 +34,6 @@ extern int pg_cryptohash_init(pg_cryptohash_ctx *ctx);
extern int pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len);
extern int pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len);
extern void pg_cryptohash_free(pg_cryptohash_ctx *ctx);
extern const char *pg_cryptohash_error(pg_cryptohash_ctx *ctx);
#endif /* PG_CRYPTOHASH_H */

9
src/include/common/md5.h
View File

@ -26,9 +26,12 @@
#define MD5_PASSWD_LEN 35
/* Utilities common to all the MD5 implementations, as of md5_common.c */
extern bool pg_md5_hash(const void *buff, size_t len, char *hexsum);
extern bool pg_md5_binary(const void *buff, size_t len, void *outbuf);
extern bool pg_md5_hash(const void *buff, size_t len, char *hexsum,
const char **errstr);
extern bool pg_md5_binary(const void *buff, size_t len, void *outbuf,
const char **errstr);
extern bool pg_md5_encrypt(const char *passwd, const char *salt,
size_t salt_len, char *buf);
size_t salt_len, char *buf,
const char **errstr);
#endif /* PG_MD5_H */

7
src/include/libpq/crypt.h
View File

@ -35,12 +35,13 @@ 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 char *get_role_password(const char *role, const 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);
int md5_salt_len, const char **logdetail);
extern int plain_crypt_verify(const char *role, const char *shadow_pass,
const char *client_pass, char **logdetail);
const char *client_pass,
const char **logdetail);
#endif

4
src/include/libpq/sasl.h
View File

@ -126,11 +126,11 @@ typedef struct pg_be_sasl_mech
int (*exchange) (void *state,
const char *input, int inputlen,
char **output, int *outputlen,
char **logdetail);
const char **logdetail);
} pg_be_sasl_mech;
/* Common implementation for auth.c */
extern int CheckSASLAuth(const pg_be_sasl_mech *mech, Port *port,
char *shadow_pass, char **logdetail);
char *shadow_pass, const char **logdetail);
#endif /* PG_SASL_H */

22
src/interfaces/libpq/fe-auth.c
View File

@ -790,6 +790,7 @@ pg_password_sendauth(PGconn *conn, const char *password, AuthRequest areq)
case AUTH_REQ_MD5:
{
char *crypt_pwd2;
const char *errstr = NULL;
/* Allocate enough space for two MD5 hashes */
crypt_pwd = malloc(2 * (MD5_PASSWD_LEN + 1));
@ -802,14 +803,21 @@ pg_password_sendauth(PGconn *conn, const char *password, AuthRequest areq)
crypt_pwd2 = crypt_pwd + MD5_PASSWD_LEN + 1;
if (!pg_md5_encrypt(password, conn->pguser,
strlen(conn->pguser), crypt_pwd2))
strlen(conn->pguser), crypt_pwd2,
&errstr))
{
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not encrypt password: %s\n"),
errstr);
free(crypt_pwd);
return STATUS_ERROR;
}
if (!pg_md5_encrypt(crypt_pwd2 + strlen("md5"), md5Salt,
4, crypt_pwd))
4, crypt_pwd, &errstr))
{
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not encrypt password: %s\n"),
errstr);
free(crypt_pwd);
return STATUS_ERROR;
}
@ -1175,12 +1183,13 @@ char *
PQencryptPassword(const char *passwd, const char *user)
{
char *crypt_pwd;
const char *errstr = NULL;
crypt_pwd = malloc(MD5_PASSWD_LEN + 1);
if (!crypt_pwd)
return NULL;
if (!pg_md5_encrypt(passwd, user, strlen(user), crypt_pwd))
if (!pg_md5_encrypt(passwd, user, strlen(user), crypt_pwd, &errstr))
{
free(crypt_pwd);
return NULL;
@ -1287,8 +1296,13 @@ PQencryptPasswordConn(PGconn *conn, const char *passwd, const char *user,
crypt_pwd = malloc(MD5_PASSWD_LEN + 1);
if (crypt_pwd)
{
if (!pg_md5_encrypt(passwd, user, strlen(user), crypt_pwd))
const char *errstr = NULL;
if (!pg_md5_encrypt(passwd, user, strlen(user), crypt_pwd, &errstr))
{
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not encrypt password: %s\n"),
errstr);
free(crypt_pwd);
crypt_pwd = NULL;
}

1
src/tools/pgindent/typedefs.list
View File

@ -3350,6 +3350,7 @@ pg_conv_map
pg_crc32
pg_crc32c
pg_cryptohash_ctx
pg_cryptohash_errno
pg_cryptohash_type
pg_ctype_cache
pg_enc