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Code Issues Releases Activity

Make the warning intervals for deprecated crypto algorithms tunable.

Browse Source 
New sysctl/tunables can now set the interval (in seconds) between
rate-limited crypto warnings.  The new sysctls are:
- kern.cryptodev_warn_interval for /dev/crypto
- net.inet.ipsec.crypto_warn_interval for IPsec
- kern.kgssapi_warn_interval for KGSSAPI

Reviewed by:	cem
MFC after:	1 month
Relnotes:	yes
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D20555
This commit is contained in:
John Baldwin 2019-06-11 23:00:55 +00:00
parent 574b98cbd9
commit 0f70218343
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348970
14 changed files with 104 additions and 17 deletions
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2
share/man/man9/Makefile
View File

@ -1996,6 +1996,7 @@ MLINKS+=sysctl.9 SYSCTL_DECL.9 \
sysctl.9 SYSCTL_ADD_S64.9 \
sysctl.9 SYSCTL_ADD_STRING.9 \
sysctl.9 SYSCTL_ADD_STRUCT.9 \
sysctl.9 SYSCTL_ADD_TIMEVAL_SEC.9 \
sysctl.9 SYSCTL_ADD_U8.9 \
sysctl.9 SYSCTL_ADD_U16.9 \
sysctl.9 SYSCTL_ADD_U32.9 \
@ -2024,6 +2025,7 @@ MLINKS+=sysctl.9 SYSCTL_DECL.9 \
sysctl.9 SYSCTL_S64.9 \
sysctl.9 SYSCTL_STRING.9 \
sysctl.9 SYSCTL_STRUCT.9 \
sysctl.9 SYSCTL_TIMEVAL_SEC.9 \
sysctl.9 SYSCTL_U8.9 \
sysctl.9 SYSCTL_U16.9 \
sysctl.9 SYSCTL_U32.9 \

30
share/man/man9/sysctl.9
View File

@ -50,6 +50,7 @@
.Nm SYSCTL_ADD_STRING ,
.Nm SYSCTL_ADD_CONST_STRING ,
.Nm SYSCTL_ADD_STRUCT ,
.Nm SYSCTL_ADD_TIMEVAL_SEC ,
.Nm SYSCTL_ADD_U8 ,
.Nm SYSCTL_ADD_U16 ,
.Nm SYSCTL_ADD_U32 ,
@ -86,6 +87,7 @@
.Nm SYSCTL_STRING ,
.Nm SYSCTL_CONST_STRING ,
.Nm SYSCTL_STRUCT ,
.Nm SYSCTL_TIMEVAL_SEC ,
.Nm SYSCTL_U8 ,
.Nm SYSCTL_U16 ,
.Nm SYSCTL_U32 ,
@ -315,6 +317,16 @@
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_TIMEVAL_SEC
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "struct timeval *ptr"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_U8
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
@ -460,6 +472,7 @@
.Fn SYSCTL_STRING parent number name ctlflags arg len descr
.Fn SYSCTL_CONST_STRING parent number name ctlflags arg descr
.Fn SYSCTL_STRUCT parent number name ctlflags ptr struct_type descr
.Fn SYSCTL_TIMEVAL_SEC parent number name ctlflags ptr descr
.Fn SYSCTL_U8 parent number name ctlflags ptr val descr
.Fn SYSCTL_U16 parent number name ctlflags ptr val descr
.Fn SYSCTL_U32 parent number name ctlflags ptr val descr
@ -649,6 +662,21 @@ macros all create nodes which export an in-kernel variable of type
These nodes do not export the raw value of the associated variable.
Instead, they export a 64-bit integer containing a count of either
milliseconds (the MSEC variants) or microseconds (the USEC variants).
.Pp
The
.Fn SYSCTL_ADD_TIMEVAL_SEC
function and
.Fn SYSCTL_TIMEVAL_SEC
macro create nodes which export an in-kernel variable of type
.Vt struct timeval .
These nodes do not export full value of the associated structure.
Instead, they export a count in seconds as a simple integer which is
stored in the
.Fa tv_sec
field of the associated variable.
This function and macro are intended to be used with variables which
store a non-negative interval rather than an absolute time.
As a result, they reject attempts to store negative values.
.Sh CREATING ROOT NODES
Sysctl MIBs or OIDs are created in a hierarchical tree.
The nodes at the bottom of the tree are called root nodes, and have no
@ -731,6 +759,7 @@ Static sysctls are declared using one of the
.Fn SYSCTL_STRING ,
.Fn SYSCTL_CONST_STRING ,
.Fn SYSCTL_STRUCT ,
.Fn SYSCTL_TIMEVAL_SEC ,
.Fn SYSCTL_U8 ,
.Fn SYSCTL_U16 ,
.Fn SYSCTL_U32 ,
@ -764,6 +793,7 @@ Dynamic nodes are created using one of the
.Fn SYSCTL_ADD_STRING ,
.Fn SYSCTL_ADD_CONST_STRING ,
.Fn SYSCTL_ADD_STRUCT ,
.Fn SYSCTL_ADD_TIMEVAL_SEC ,
.Fn SYSCTL_ADD_U8 ,
.Fn SYSCTL_ADD_U16 ,
.Fn SYSCTL_ADD_U32 ,

23
sys/kern/kern_sysctl.c
View File

@ -1732,6 +1732,29 @@ sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS)
return (0);
}
/*
* Convert seconds to a struct timeval. Intended for use with
* intervals and thus does not permit negative seconds.
*/
int
sysctl_sec_to_timeval(SYSCTL_HANDLER_ARGS)
{
struct timeval *tv;
int error, secs;
tv = arg1;
secs = tv->tv_sec;
error = sysctl_handle_int(oidp, &secs, 0, req);
if (error || req->newptr == NULL)
return (error);
if (secs < 0)
return (EINVAL);
tv->tv_sec = secs;
return (0);
}
/*
* Transfer functions to/from kernel space.

6
sys/kgssapi/krb5/kcrypto.c
View File

@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
#include <sys/malloc.h>
#include <sys/kobj.h>
#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -50,6 +51,11 @@ static struct krb5_encryption_class *krb5_encryption_classes[] = {
NULL
};
struct timeval krb5_warn_interval = { .tv_sec = 3600, .tv_usec = 0 };
SYSCTL_TIMEVAL_SEC(_kern, OID_AUTO, kgssapi_warn_interval, CTLFLAG_RW,
&krb5_warn_interval,
"Delay in seconds between warnings of deprecated KGSSAPI crypto.");
struct krb5_encryption_class *
krb5_find_encryption_class(int etype)
{

1
sys/kgssapi/krb5/kcrypto.h
View File

@ -101,6 +101,7 @@ extern struct krb5_encryption_class krb5_aes128_encryption_class;
extern struct krb5_encryption_class krb5_aes256_encryption_class;
extern struct krb5_encryption_class krb5_arcfour_encryption_class;
extern struct krb5_encryption_class krb5_arcfour_56_encryption_class;
extern struct timeval krb5_warn_interval;
static __inline void
krb5_set_key(struct krb5_key_state *ks, const void *keydata)

3
sys/kgssapi/krb5/kcrypto_arcfour.c
View File

@ -47,10 +47,9 @@ static void
arcfour_init(struct krb5_key_state *ks)
{
static struct timeval lastwarn;
static struct timeval warninterval = { .tv_sec = 3600, .tv_usec = 0 };
ks->ks_priv = NULL;
if (ratecheck(&lastwarn, &warninterval))
if (ratecheck(&lastwarn, &krb5_warn_interval))
gone_in(13, "RC4 cipher for Kerberos GSS");
}

3
sys/kgssapi/krb5/kcrypto_des.c
View File

@ -54,13 +54,12 @@ static void
des1_init(struct krb5_key_state *ks)
{
static struct timeval lastwarn;
static struct timeval warninterval = { .tv_sec = 3600, .tv_usec = 0 };
struct des1_state *ds;
ds = malloc(sizeof(struct des1_state), M_GSSAPI, M_WAITOK|M_ZERO);
mtx_init(&ds->ds_lock, "gss des lock", NULL, MTX_DEF);
ks->ks_priv = ds;
if (ratecheck(&lastwarn, &warninterval))
if (ratecheck(&lastwarn, &krb5_warn_interval))
gone_in(13, "DES cipher for Kerberos GSS");
}

3
sys/kgssapi/krb5/kcrypto_des3.c
View File

@ -55,13 +55,12 @@ static void
des3_init(struct krb5_key_state *ks)
{
static struct timeval lastwarn;
static struct timeval warninterval = { .tv_sec = 3600, .tv_usec = 0 };
struct des3_state *ds;
ds = malloc(sizeof(struct des3_state), M_GSSAPI, M_WAITOK|M_ZERO);
mtx_init(&ds->ds_lock, "gss des3 lock", NULL, MTX_DEF);
ks->ks_priv = ds;
if (ratecheck(&lastwarn, &warninterval))
if (ratecheck(&lastwarn, &krb5_warn_interval))
gone_in(13, "DES3 cipher for Kerberos GSS");
}

5
sys/netipsec/ipsec.c
View File

@ -216,6 +216,11 @@ SYSCTL_INT(_net_inet_ipsec, OID_AUTO, filtertunnel,
SYSCTL_VNET_PCPUSTAT(_net_inet_ipsec, OID_AUTO, ipsecstats, struct ipsecstat,
ipsec4stat, "IPsec IPv4 statistics.");
struct timeval ipsec_warn_interval = { .tv_sec = 1, .tv_usec = 0 };
SYSCTL_TIMEVAL_SEC(_net_inet_ipsec, OID_AUTO, crypto_warn_interval, CTLFLAG_RW,
&ipsec_warn_interval,
"Delay in seconds between warnings of deprecated IPsec crypto algorithms.");
#ifdef REGRESSION
/*
* When set to 1, IPsec will send packets with the same sequence number.

2
sys/netipsec/ipsec.h
View File

@ -287,6 +287,8 @@ VNET_DECLARE(int, crypto_support);
VNET_DECLARE(int, async_crypto);
VNET_DECLARE(int, natt_cksum_policy);
extern struct timeval ipsec_warn_interval;
#define IPSECSTAT_INC(name) \
VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1)
#define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev)

9
sys/netipsec/xform_ah.c
View File

@ -109,7 +109,6 @@ SYSCTL_VNET_PCPUSTAT(_net_inet_ah, IPSECCTL_STATS, stats, struct ahstat,
static unsigned char ipseczeroes[256]; /* larger than an ip6 extension hdr */
static struct timeval md5warn, ripewarn, kpdkmd5warn, kpdksha1warn;
static struct timeval warninterval = { .tv_sec = 1, .tv_usec = 0 };
static int ah_input_cb(struct cryptop*);
static int ah_output_cb(struct cryptop*);
@ -189,19 +188,19 @@ ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
switch (sav->alg_auth) {
case SADB_AALG_MD5HMAC:
if (ratecheck(&md5warn, &warninterval))
if (ratecheck(&md5warn, &ipsec_warn_interval))
gone_in(13, "MD5-HMAC authenticator for IPsec");
break;
case SADB_X_AALG_RIPEMD160HMAC:
if (ratecheck(&ripewarn, &warninterval))
if (ratecheck(&ripewarn, &ipsec_warn_interval))
gone_in(13, "RIPEMD160-HMAC authenticator for IPsec");
break;
case SADB_X_AALG_MD5:
if (ratecheck(&kpdkmd5warn, &warninterval))
if (ratecheck(&kpdkmd5warn, &ipsec_warn_interval))
gone_in(13, "Keyed-MD5 authenticator for IPsec");
break;
case SADB_X_AALG_SHA:
if (ratecheck(&kpdksha1warn, &warninterval))
if (ratecheck(&kpdksha1warn, &ipsec_warn_interval))
gone_in(13, "Keyed-SHA1 authenticator for IPsec");
break;
}

9
sys/netipsec/xform_esp.c
View File

@ -95,7 +95,6 @@ SYSCTL_VNET_PCPUSTAT(_net_inet_esp, IPSECCTL_STATS, stats,
"ESP statistics (struct espstat, netipsec/esp_var.h");
static struct timeval deswarn, blfwarn, castwarn, camelliawarn;
static struct timeval warninterval = { .tv_sec = 1, .tv_usec = 0 };
static int esp_input_cb(struct cryptop *op);
static int esp_output_cb(struct cryptop *crp);
@ -162,19 +161,19 @@ esp_init(struct secasvar *sav, struct xformsw *xsp)
switch (sav->alg_enc) {
case SADB_EALG_DESCBC:
if (ratecheck(&deswarn, &warninterval))
if (ratecheck(&deswarn, &ipsec_warn_interval))
gone_in(13, "DES cipher for IPsec");
break;
case SADB_X_EALG_BLOWFISHCBC:
if (ratecheck(&blfwarn, &warninterval))
if (ratecheck(&blfwarn, &ipsec_warn_interval))
gone_in(13, "Blowfish cipher for IPsec");
break;
case SADB_X_EALG_CAST128CBC:
if (ratecheck(&castwarn, &warninterval))
if (ratecheck(&castwarn, &ipsec_warn_interval))
gone_in(13, "CAST cipher for IPsec");
break;
case SADB_X_EALG_CAMELLIACBC:
if (ratecheck(&camelliawarn, &warninterval))
if (ratecheck(&camelliawarn, &ipsec_warn_interval))
gone_in(13, "Camellia cipher for IPsec");
break;
}

6
sys/opencrypto/cryptodev.c
View File

@ -146,6 +146,11 @@ struct cryptostats32 {
#define CIOCGSESSION232 _IOWR('c', 106, struct session2_op32)
#define CIOCKEY232 _IOWR('c', 107, struct crypt_kop32)
static struct timeval warninterval = { .tv_sec = 60, .tv_usec = 0 };
SYSCTL_TIMEVAL_SEC(_kern, OID_AUTO, cryptodev_warn_interval, CTLFLAG_RW,
&warninterval,
"Delay in seconds between warnings of deprecated /dev/crypto algorithms");
static void
session_op_from_32(const struct session_op32 *from, struct session_op *to)
{
@ -388,7 +393,6 @@ cryptof_ioctl(
#endif
static struct timeval arc4warn, blfwarn, castwarn, deswarn, md5warn;
static struct timeval skipwarn, tdeswarn;
static struct timeval warninterval = { .tv_sec = 60, .tv_usec = 0 };
switch (cmd) {
case CIOCGSESSION:

19
sys/sys/sysctl.h
View File

@ -218,6 +218,7 @@ int sysctl_handle_uma_zone_cur(SYSCTL_HANDLER_ARGS);
int sysctl_msec_to_sbintime(SYSCTL_HANDLER_ARGS);
int sysctl_usec_to_sbintime(SYSCTL_HANDLER_ARGS);
int sysctl_sec_to_timeval(SYSCTL_HANDLER_ARGS);
int sysctl_dpcpu_int(SYSCTL_HANDLER_ARGS);
int sysctl_dpcpu_long(SYSCTL_HANDLER_ARGS);
@ -857,6 +858,24 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
NULL); \
})
/* OID expressing a struct timeval as seconds */
#define SYSCTL_TIMEVAL_SEC(parent, nbr, name, access, ptr, descr) \
SYSCTL_OID(parent, nbr, name, \
CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access), \
(ptr), 0, sysctl_sec_to_timeval, "I", descr); \
CTASSERT(((access) & CTLTYPE) == 0 || \
((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT)
#define SYSCTL_ADD_TIMEVAL_SEC(ctx, parent, nbr, name, access, ptr, descr) \
({ \
struct timeval *__ptr = (ptr); \
CTASSERT(((access) & CTLTYPE) == 0 || \
((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_INT); \
sysctl_add_oid(ctx, parent, nbr, name, \
CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD | (access), \
__ptr, 0, sysctl_sec_to_timeval, "I", __DESCR(descr), \
NULL); \
})
/*
* A macro to generate a read-only sysctl to indicate the presence of optional
* kernel features.