| Message ID | 20190224060828.2527-11-vt@altlinux.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | crypto: add EC-RDSA (GOST 34.10) algorithm | expand |
Hello Vitaly, Vitaly Chikunov <vt@altlinux.org> writes: > Allow to use EC-RDSA signatures for IMA by determining signature type by > the hash algorithm name. This works good for EC-RDSA since Streebog and > EC-RDSA should always be used together. > > Cc: Mimi Zohar <zohar@linux.ibm.com> > Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> > Cc: linux-integrity@vger.kernel.org > Signed-off-by: Vitaly Chikunov <vt@altlinux.org> > --- > security/integrity/digsig_asymmetric.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c > index d775e03fbbcc..c4a3313e0210 100644 > --- a/security/integrity/digsig_asymmetric.c > +++ b/security/integrity/digsig_asymmetric.c > @@ -104,9 +104,14 @@ int asymmetric_verify(struct key *keyring, const char *sig, > > memset(&pks, 0, sizeof(pks)); > > - pks.pkey_algo = "rsa"; > pks.hash_algo = hash_algo_name[hdr->hash_algo]; > - pks.encoding = "pkcs1"; > + if (!strncmp(pks.hash_algo, "streebog", 8)) { Is it possible to test hdr->hash_algo instead of pkcs.hash_algo? IMHO if an integer value is available it's preferable to check it rather than doing a string comparison. Also, it would be good to have a comment here mentioning that Streebog and EC-RDSA should always be used together > + pks.pkey_algo = "ecrdsa"; > + pks.encoding = "raw"; > + } else { > + pks.pkey_algo = "rsa"; > + pks.encoding = "pkcs1"; > + } > pks.digest = (u8 *)data; > pks.digest_size = datalen; > pks.s = hdr->sig; -- Thiago Jung Bauermann IBM Linux Technology Center
Thiago, On Mon, Feb 25, 2019 at 06:20:49PM -0300, Thiago Jung Bauermann wrote: > Vitaly Chikunov <vt@altlinux.org> writes: > > > Allow to use EC-RDSA signatures for IMA by determining signature type by > > the hash algorithm name. This works good for EC-RDSA since Streebog and > > EC-RDSA should always be used together. > > > > Cc: Mimi Zohar <zohar@linux.ibm.com> > > Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> > > Cc: linux-integrity@vger.kernel.org > > Signed-off-by: Vitaly Chikunov <vt@altlinux.org> > > --- > > security/integrity/digsig_asymmetric.c | 9 +++++++-- > > 1 file changed, 7 insertions(+), 2 deletions(-) > > > > diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c > > index d775e03fbbcc..c4a3313e0210 100644 > > --- a/security/integrity/digsig_asymmetric.c > > +++ b/security/integrity/digsig_asymmetric.c > > @@ -104,9 +104,14 @@ int asymmetric_verify(struct key *keyring, const char *sig, > > > > memset(&pks, 0, sizeof(pks)); > > > > - pks.pkey_algo = "rsa"; > > pks.hash_algo = hash_algo_name[hdr->hash_algo]; > > - pks.encoding = "pkcs1"; > > + if (!strncmp(pks.hash_algo, "streebog", 8)) { > > Is it possible to test hdr->hash_algo instead of pkcs.hash_algo? IMHO if > an integer value is available it's preferable to check it rather than > doing a string comparison. Yes. But we have long tradition of comparing by the name too: --linux$ git grep str.*cmp.*'"sha[12]' drivers/crypto/mxs-dcp.c: if (strcmp(halg->base.cra_name, "sha1") == 0) drivers/crypto/talitos.c: (!strcmp(alg->cra_name, "sha224") || net/sctp/sysctl.c: if (!strncmp(tmp, "sha1", 4)) { scripts/sign-file.c: if (strcmp(hash_algo, "sha1") != 0) { security/integrity/ima/ima_main.c: if (strncmp(str, "sha1", 4) == 0) --linux$ git grep str.*cmp.*hash_algo fs/ubifs/sb.c: if (strcmp(hash_algo_name[hash_algo], c->auth_hash_name)) { scripts/sign-file.c: if (strcmp(hash_algo, "sha1") != 0) { security/integrity/ima/ima_main.c: if (error && strcmp(hash_algo_name[ima_hash_algo], security/keys/trusted.c: if (!strcmp(args[0].from, hash_algo_name[i])) { --linux$ git grep str.*cmp.*cra_name crypto/adiantum.c: if (strcmp(streamcipher_alg->base.cra_name, "xchacha12") != 0 && crypto/adiantum.c: strcmp(streamcipher_alg->base.cra_name, "xchacha20") != 0) crypto/adiantum.c: if (strcmp(hash_alg->base.cra_name, "nhpoly1305") != 0) crypto/algapi.c: if (!strcmp(q->cra_driver_name, alg->cra_name) || crypto/algapi.c: !strcmp(q->cra_name, alg->cra_driver_name)) crypto/algapi.c: if (strcmp(alg->cra_name, q->cra_name) && crypto/algapi.c: strcmp(alg->cra_driver_name, q->cra_name)) crypto/algapi.c: if (strcmp(alg->cra_name, q->cra_name)) crypto/api.c: fuzzy = !strcmp(q->cra_name, name); crypto/crypto_user_base.c: match = !strcmp(q->cra_name, p->cru_name); crypto/cts.c: if (strncmp(alg->base.cra_name, "cbc(", 4)) crypto/simd.c: WARN_ON(strncmp(algs[i].base.cra_name, "__", 2)); drivers/crypto/mxs-dcp.c: if (strcmp(halg->base.cra_name, "sha1") == 0) drivers/crypto/talitos.c: !strncmp(alg->cra_name, "authenc(hmac(sha224)", 20)) { drivers/crypto/talitos.c: if (!strncmp(alg->cra_name, "hmac", 4)) drivers/crypto/talitos.c: !strncmp(alg->cra_name, "hmac", 4)) { drivers/crypto/talitos.c: (!strcmp(alg->cra_name, "sha224") || drivers/crypto/talitos.c: !strcmp(alg->cra_name, "hmac(sha224)"))) { lib/crc-t10dif.c: strncmp(alg->cra_name, CRC_T10DIF_STRING, strlen(CRC_T10DIF_STRING))) After all pkey_algo, hash_algo, cra_name are set to strings to be used somewhere. So both ways looks equal to me. [I more wonder if we should leave algo names to be used as they are in x509_note_signature() (to check for "rsa" and "ecrdsa"), since there are no other pkey_algo's set in x509_note_pkey_algo().] > Also, it would be good to have a comment here mentioning that Streebog > and EC-RDSA should always be used together Thanks, > > + pks.pkey_algo = "ecrdsa"; > > + pks.encoding = "raw"; > > + } else { > > + pks.pkey_algo = "rsa"; > > + pks.encoding = "pkcs1"; > > + } > > pks.digest = (u8 *)data; > > pks.digest_size = datalen; > > pks.s = hdr->sig; > > -- > Thiago Jung Bauermann > IBM Linux Technology Center
> > > diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c > > > index d775e03fbbcc..c4a3313e0210 100644 > > > --- a/security/integrity/digsig_asymmetric.c > > > +++ b/security/integrity/digsig_asymmetric.c > > > @@ -104,9 +104,14 @@ int asymmetric_verify(struct key *keyring, const char *sig, > > > > > > memset(&pks, 0, sizeof(pks)); > > > > > > - pks.pkey_algo = "rsa"; > > > pks.hash_algo = hash_algo_name[hdr->hash_algo]; > > > - pks.encoding = "pkcs1"; > > > + if (!strncmp(pks.hash_algo, "streebog", 8)) { > > > > Is it possible to test hdr->hash_algo instead of pkcs.hash_algo? IMHO if > > an integer value is available it's preferable to check it rather than > > doing a string comparison. > > Yes. But we have long tradition of comparing by the name too: > > --linux$ git grep str.*cmp.*'"sha[12]' > drivers/crypto/mxs-dcp.c: if (strcmp(halg->base.cra_name, "sha1") == 0) > drivers/crypto/talitos.c: (!strcmp(alg->cra_name, "sha224") || > net/sctp/sysctl.c: if (!strncmp(tmp, "sha1", 4)) { > scripts/sign-file.c: if (strcmp(hash_algo, "sha1") != 0) { sign_file.c is a userspace program used for signing kernel modules. This example is not applicable. > security/integrity/ima/ima_main.c: if (strncmp(str, "sha1", 4) == 0) In the ima_main.c example, it is used in an __init function to set up crypto defaults. The code also predates the enumerations defined in crypto/hash_info.c. Mimi
diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c index d775e03fbbcc..c4a3313e0210 100644 --- a/security/integrity/digsig_asymmetric.c +++ b/security/integrity/digsig_asymmetric.c @@ -104,9 +104,14 @@ int asymmetric_verify(struct key *keyring, const char *sig, memset(&pks, 0, sizeof(pks)); - pks.pkey_algo = "rsa"; pks.hash_algo = hash_algo_name[hdr->hash_algo]; - pks.encoding = "pkcs1"; + if (!strncmp(pks.hash_algo, "streebog", 8)) { + pks.pkey_algo = "ecrdsa"; + pks.encoding = "raw"; + } else { + pks.pkey_algo = "rsa"; + pks.encoding = "pkcs1"; + } pks.digest = (u8 *)data; pks.digest_size = datalen; pks.s = hdr->sig;
Allow to use EC-RDSA signatures for IMA by determining signature type by the hash algorithm name. This works good for EC-RDSA since Streebog and EC-RDSA should always be used together. Cc: Mimi Zohar <zohar@linux.ibm.com> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: linux-integrity@vger.kernel.org Signed-off-by: Vitaly Chikunov <vt@altlinux.org> --- security/integrity/digsig_asymmetric.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)