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SUNRPC: Refactor set-up for aux_cipher

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Hoist the name of the aux_cipher into struct gss_krb5_enctype to
prepare for obscuring the encryption keys just after they are
derived.

Tested-by: Scott Mayhew <smayhew@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-01-15 12:20:54 -05:00
parent 01c4e32632
commit 7989a4f4ab
2 changed files with 26 additions and 25 deletions
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1
include/linux/sunrpc/gss_krb5.h
View File

@ -61,6 +61,7 @@ struct gss_krb5_enctype {
const u32 ctype; /* checksum type */
const char *name; /* "friendly" name */
const char *encrypt_name; /* crypto encrypt name */
const char *aux_cipher; /* aux encrypt cipher name */
const char *cksum_name; /* crypto checksum name */
const u16 signalg; /* signing algorithm */
const u16 sealalg; /* sealing algorithm */

50
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -78,6 +78,7 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
.ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
.name = "aes128-cts",
.encrypt_name = "cts(cbc(aes))",
.aux_cipher = "cbc(aes)",
.cksum_name = "hmac(sha1)",
.encrypt = krb5_encrypt,
.decrypt = krb5_decrypt,
@ -99,6 +100,7 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
.ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
.name = "aes256-cts",
.encrypt_name = "cts(cbc(aes))",
.aux_cipher = "cbc(aes)",
.cksum_name = "hmac(sha1)",
.encrypt = krb5_encrypt,
.decrypt = krb5_decrypt,
@ -373,6 +375,13 @@ context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
ctx->initiator_seal);
if (ctx->initiator_enc == NULL)
goto out_err;
if (ctx->gk5e->aux_cipher) {
ctx->initiator_enc_aux =
context_v2_alloc_cipher(ctx, ctx->gk5e->aux_cipher,
ctx->initiator_seal);
if (ctx->initiator_enc_aux == NULL)
goto out_free;
}
/* acceptor seal encryption */
set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
@ -381,13 +390,20 @@ context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
if (err) {
dprintk("%s: Error %d deriving acceptor_seal key\n",
__func__, err);
goto out_free_initiator_enc;
goto out_free;
}
ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
ctx->gk5e->encrypt_name,
ctx->acceptor_seal);
if (ctx->acceptor_enc == NULL)
goto out_free_initiator_enc;
goto out_free;
if (ctx->gk5e->aux_cipher) {
ctx->acceptor_enc_aux =
context_v2_alloc_cipher(ctx, ctx->gk5e->aux_cipher,
ctx->acceptor_seal);
if (ctx->acceptor_enc_aux == NULL)
goto out_free;
}
/* initiator sign checksum */
set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
@ -396,7 +412,7 @@ context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
if (err) {
dprintk("%s: Error %d deriving initiator_sign key\n",
__func__, err);
goto out_free_acceptor_enc;
goto out_free;
}
/* acceptor sign checksum */
@ -406,7 +422,7 @@ context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
if (err) {
dprintk("%s: Error %d deriving acceptor_sign key\n",
__func__, err);
goto out_free_acceptor_enc;
goto out_free;
}
/* initiator seal integrity */
@ -416,7 +432,7 @@ context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
if (err) {
dprintk("%s: Error %d deriving initiator_integ key\n",
__func__, err);
goto out_free_acceptor_enc;
goto out_free;
}
/* acceptor seal integrity */
@ -426,31 +442,15 @@ context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
if (err) {
dprintk("%s: Error %d deriving acceptor_integ key\n",
__func__, err);
goto out_free_acceptor_enc;
}
switch (ctx->enctype) {
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
ctx->initiator_enc_aux =
context_v2_alloc_cipher(ctx, "cbc(aes)",
ctx->initiator_seal);
if (ctx->initiator_enc_aux == NULL)
goto out_free_acceptor_enc;
ctx->acceptor_enc_aux =
context_v2_alloc_cipher(ctx, "cbc(aes)",
ctx->acceptor_seal);
if (ctx->acceptor_enc_aux == NULL) {
crypto_free_sync_skcipher(ctx->initiator_enc_aux);
goto out_free_acceptor_enc;
}
goto out_free;
}
return 0;
out_free_acceptor_enc:
out_free:
crypto_free_sync_skcipher(ctx->acceptor_enc_aux);
crypto_free_sync_skcipher(ctx->acceptor_enc);
out_free_initiator_enc:
crypto_free_sync_skcipher(ctx->initiator_enc_aux);
crypto_free_sync_skcipher(ctx->initiator_enc);
out_err:
return -EINVAL;