#include "cacheio.h"
#include "lsupport.h"
#include "gss_oids.h"
+#include "sk_utils.h"
#include <lustre/lustre_idl.h>
-extern const char *gss_OID_mech_name(gss_OID mech);
-
#define SVCGSSD_CONTEXT_CHANNEL "/proc/net/rpc/auth.sptlrpc.context/channel"
#define SVCGSSD_INIT_CHANNEL "/proc/net/rpc/auth.sptlrpc.init/channel"
/* XXXARG: */
int g;
- printerr(2, "sending null reply\n");
-
+ printerr(2, "sending reply\n");
qword_addhex(&bp, &blen, in_handle->value, in_handle->length);
qword_addhex(&bp, &blen, in_token->value, in_token->length);
qword_addint(&bp, &blen, 3600); /* an hour should be sufficient */
qword_addhex(&bp, &blen, out_token->value, out_token->length);
qword_addeol(&bp, &blen);
if (blen <= 0) {
- printerr(0, "WARNING: send_respsonse: message too long\n");
+ printerr(0, "WARNING: send_response: message too long\n");
return -1;
}
g = open(SVCGSSD_INIT_CHANNEL, O_WRONLY);
#define rpcsec_gsserr_credproblem 13
#define rpcsec_gsserr_ctxproblem 14
-#if 0
-static void
-add_supplementary_groups(char *secname, char *name, struct svc_cred *cred)
-{
- int ret;
- static gid_t *groups = NULL;
-
- cred->cr_ngroups = NGROUPS;
- ret = nfs4_gss_princ_to_grouplist(secname, name,
- cred->cr_groups, &cred->cr_ngroups);
- if (ret < 0) {
- groups = realloc(groups, cred->cr_ngroups*sizeof(gid_t));
- ret = nfs4_gss_princ_to_grouplist(secname, name,
- groups, &cred->cr_ngroups);
- if (ret < 0)
- cred->cr_ngroups = 0;
- else {
- if (cred->cr_ngroups > NGROUPS)
- cred->cr_ngroups = NGROUPS;
- memcpy(cred->cr_groups, groups,
- cred->cr_ngroups*sizeof(gid_t));
- }
- }
-}
-#endif
-
-#if 0
-static int
-get_ids(gss_name_t client_name, gss_OID mech, struct svc_cred *cred)
-{
- u_int32_t maj_stat, min_stat;
- gss_buffer_desc name;
- char *sname;
- int res = -1;
- uid_t uid, gid;
- gss_OID name_type = GSS_C_NO_OID;
- char *secname;
-
- maj_stat = gss_display_name(&min_stat, client_name, &name, &name_type);
- if (maj_stat != GSS_S_COMPLETE) {
- pgsserr("get_ids: gss_display_name",
- maj_stat, min_stat, mech);
- goto out;
- }
- if (name.length >= 0xffff || /* be certain name.length+1 doesn't overflow */
- !(sname = calloc(name.length + 1, 1))) {
- printerr(0, "WARNING: get_ids: error allocating %d bytes "
- "for sname\n", name.length + 1);
- gss_release_buffer(&min_stat, &name);
- goto out;
- }
- memcpy(sname, name.value, name.length);
- printerr(1, "sname = %s\n", sname);
- gss_release_buffer(&min_stat, &name);
-
- res = -EINVAL;
- if ((secname = mech2file(mech)) == NULL) {
- printerr(0, "WARNING: get_ids: error mapping mech to "
- "file for name '%s'\n", sname);
- goto out_free;
- }
- nfs4_init_name_mapping(NULL); /* XXX: should only do this once */
- res = nfs4_gss_princ_to_ids(secname, sname, &uid, &gid);
- if (res < 0) {
- /*
- * -ENOENT means there was no mapping, any other error
- * value means there was an error trying to do the
- * mapping.
- * If there was no mapping, we send down the value -1
- * to indicate that the anonuid/anongid for the export
- * should be used.
- */
- if (res == -ENOENT) {
- cred->cr_uid = -1;
- cred->cr_gid = -1;
- cred->cr_ngroups = 0;
- res = 0;
- goto out_free;
- }
- printerr(0, "WARNING: get_ids: failed to map name '%s' "
- "to uid/gid: %s\n", sname, strerror(-res));
- goto out_free;
- }
- cred->cr_uid = uid;
- cred->cr_gid = gid;
- add_supplementary_groups(secname, sname, cred);
- res = 0;
-out_free:
- free(sname);
-out:
- return res;
-}
-#endif
-
-#if 0
-void
-print_hexl(int pri, unsigned char *cp, int length)
-{
- int i, j, jm;
- unsigned char c;
-
- printerr(pri, "length %d\n",length);
- printerr(pri, "\n");
-
- for (i = 0; i < length; i += 0x10) {
- printerr(pri, " %04x: ", (unsigned int)i);
- jm = length - i;
- jm = jm > 16 ? 16 : jm;
-
- for (j = 0; j < jm; j++) {
- if ((j % 2) == 1)
- printerr(pri, "%02x ", (unsigned int)cp[i+j]);
- else
- printerr(pri, "%02x", (unsigned int)cp[i+j]);
- }
- for (; j < 16; j++) {
- if ((j % 2) == 1)
- printerr(pri," ");
- else
- printerr(pri," ");
- }
- printerr(pri," ");
-
- for (j = 0; j < jm; j++) {
- c = cp[i+j];
- c = isprint(c) ? c : '.';
- printerr(pri,"%c", c);
- }
- printerr(pri,"\n");
- }
-}
-#endif
-
static int
get_ids(gss_name_t client_name, gss_OID mech, struct svc_cred *cred,
lnet_nid_t nid, uint32_t lustre_svc)
gss_ctx_id_t internal_ctx_id;
} gss_union_ctx_id_desc, *gss_union_ctx_id_t;
+int handle_sk(struct svc_nego_data *snd)
+{
+ struct sk_cred *skc = NULL;
+ struct svc_cred cred;
+ gss_buffer_desc bufs[7];
+ gss_buffer_desc remote_pub_key = GSS_C_EMPTY_BUFFER;
+ char *target;
+ uint32_t rc = GSS_S_FAILURE;
+ uint32_t flags;
+ int numbufs = 7;
+ int i;
+
+ printerr(3, "Handling sk request\n");
+
+ /* See lgss_sk_using_cred() for client side token
+ * bufs returned are in this order:
+ * bufs[0] - iv
+ * bufs[1] - p
+ * bufs[2] - remote_pub_key
+ * bufs[3] - target
+ * bufs[4] - nodemap_hash
+ * bufs[5] - flags
+ * bufs[6] - hmac */
+ i = sk_decode_netstring(bufs, numbufs, &snd->in_tok);
+ if (i < numbufs) {
+ printerr(0, "Invalid netstring token received from peer\n");
+ rc = GSS_S_DEFECTIVE_TOKEN;
+ goto out_err;
+ }
+
+ /* target must be a null terminated string */
+ i = bufs[3].length - 1;
+ target = bufs[3].value;
+ if (i >= 0 && target[i] != '\0') {
+ printerr(0, "Invalid target from netstring\n");
+ for (i = 0; i < numbufs; i++)
+ free(bufs[i].value);
+ goto out_err;
+ }
+
+ memcpy(&flags, bufs[5].value, sizeof(flags));
+ skc = sk_create_cred(target, snd->nm_name, be32_to_cpu(flags));
+ if (!skc) {
+ printerr(0, "Failed to create sk credentials\n");
+ for (i = 0; i < numbufs; i++)
+ free(bufs[i].value);
+ goto out_err;
+ }
+
+ /* Take control of all the allocated buffers from decoding */
+ skc->sc_kctx.skc_iv = bufs[0];
+ skc->sc_p = bufs[1];
+ remote_pub_key = bufs[2];
+ skc->sc_nodemap_hash = bufs[4];
+ skc->sc_hmac = bufs[6];
+
+ /* Verify that the peer has used a key size greater to or equal
+ * the size specified by the key file */
+ if (skc->sc_flags & LGSS_SVC_PRIV &&
+ skc->sc_p.length < skc->sc_session_keylen) {
+ printerr(0, "Peer DH parameters do not meet the size required "
+ "by keyfile\n");
+ goto out_err;
+ }
+
+ /* Verify HMAC from peer. Ideally this would happen before anything
+ * else but we don't have enough information to lookup key without the
+ * token (fsname and cluster_hash) so it's done shortly after. */
+ rc = sk_verify_hmac(skc, bufs, numbufs - 1, EVP_sha256(),
+ &skc->sc_hmac);
+ free(bufs[3].value);
+ free(bufs[5].value);
+ if (rc != GSS_S_COMPLETE) {
+ printerr(0, "HMAC verification error: 0x%x from peer %s\n",
+ rc, libcfs_nid2str((lnet_nid_t) snd->nid));
+ goto out_err;
+ }
+
+ /* Check that the cluster hash matches the hash of nodemap name */
+ rc = sk_verify_hash(snd->nm_name, EVP_sha256(), &skc->sc_nodemap_hash);
+ if (rc != GSS_S_COMPLETE) {
+ printerr(0, "Cluster hash failed validation: 0x%x\n", rc);
+ goto out_err;
+ }
+
+ rc = sk_gen_params(skc, false);
+ if (rc != GSS_S_COMPLETE) {
+ printerr(0, "Failed to generate DH params for responder\n");
+ goto out_err;
+ }
+ if (sk_compute_key(skc, &remote_pub_key)) {
+ printerr(0, "Failed to compute session key from DH params\n");
+ goto out_err;
+ }
+ if (sk_kdf(skc, snd->nid, &snd->in_tok)) {
+ printerr(0, "Failed to calulate derviced session key\n");
+ goto out_err;
+ }
+ if (sk_serialize_kctx(skc, &snd->ctx_token)) {
+ printerr(0, "Failed to serialize context for kernel\n");
+ goto out_err;
+ }
+
+ /* Server reply only contains the servers public key and HMAC */
+ bufs[0] = skc->sc_pub_key;
+ if (sk_sign_bufs(&skc->sc_kctx.skc_shared_key, bufs, 1, EVP_sha256(),
+ &skc->sc_hmac)) {
+ printerr(0, "Failed to sign parameters\n");
+ goto out_err;
+ }
+ bufs[1] = skc->sc_hmac;
+ if (sk_encode_netstring(bufs, 2, &snd->out_tok)) {
+ printerr(0, "Failed to encode netstring for token\n");
+ goto out_err;
+ }
+
+ printerr(2, "Created netstring of %zd bytes\n", snd->out_tok.length);
+
+ snd->out_handle.length = sizeof(snd->handle_seq);
+ memcpy(snd->out_handle.value, &snd->handle_seq,
+ sizeof(snd->handle_seq));
+ snd->maj_stat = GSS_S_COMPLETE;
+
+ /* fix credentials */
+ memset(&cred, 0, sizeof(cred));
+ cred.cr_mapped_uid = -1;
+
+ if (skc->sc_flags & LGSS_ROOT_CRED_ROOT)
+ cred.cr_usr_root = 1;
+ if (skc->sc_flags & LGSS_ROOT_CRED_MDT)
+ cred.cr_usr_mds = 1;
+ if (skc->sc_flags & LGSS_ROOT_CRED_OST)
+ cred.cr_usr_oss = 1;
+
+ do_svc_downcall(&snd->out_handle, &cred, snd->mech, &snd->ctx_token);
+
+ /* cleanup ctx_token, out_tok is cleaned up in handle_channel_req */
+ free(remote_pub_key.value);
+ free(snd->ctx_token.value);
+ snd->ctx_token.length = 0;
+
+ printerr(3, "sk returning success\n");
+ return 0;
+
+out_err:
+ snd->maj_stat = rc;
+ if (remote_pub_key.value)
+ free(remote_pub_key.value);
+ if (snd->ctx_token.value)
+ free(snd->ctx_token.value);
+ snd->ctx_token.length = 0;
+
+ if (skc)
+ sk_free_cred(skc);
+ printerr(3, "sk returning failure\n");
+ return -1;
+}
+
+int handle_null(struct svc_nego_data *snd)
+{
+ struct svc_cred cred;
+ uint64_t tmp;
+ uint32_t flags;
+
+ /* null just uses the same token as the return token and for
+ * for sending to the kernel. It is a single uint64_t. */
+ if (snd->in_tok.length != sizeof(uint64_t)) {
+ snd->maj_stat = GSS_S_DEFECTIVE_TOKEN;
+ printerr(0, "Invalid token size (%zd) received\n",
+ snd->in_tok.length);
+ return -1;
+ }
+ snd->out_tok.length = snd->in_tok.length;
+ snd->out_tok.value = malloc(snd->out_tok.length);
+ if (!snd->out_tok.value) {
+ snd->maj_stat = GSS_S_FAILURE;
+ printerr(0, "Failed to allocate out_tok\n");
+ return -1;
+ }
+
+ snd->ctx_token.length = snd->in_tok.length;
+ snd->ctx_token.value = malloc(snd->ctx_token.length);
+ if (!snd->ctx_token.value) {
+ snd->maj_stat = GSS_S_FAILURE;
+ printerr(0, "Failed to allocate ctx_token\n");
+ return -1;
+ }
+
+ snd->out_handle.length = sizeof(snd->handle_seq);
+ memcpy(snd->out_handle.value, &snd->handle_seq,
+ sizeof(snd->handle_seq));
+ snd->maj_stat = GSS_S_COMPLETE;
+
+ memcpy(&tmp, snd->in_tok.value, sizeof(tmp));
+ tmp = be64_to_cpu(tmp);
+ flags = (uint32_t)(tmp & 0x00000000ffffffff);
+ memset(&cred, 0, sizeof(cred));
+ cred.cr_mapped_uid = -1;
+
+ if (flags & LGSS_ROOT_CRED_ROOT)
+ cred.cr_usr_root = 1;
+ if (flags & LGSS_ROOT_CRED_MDT)
+ cred.cr_usr_mds = 1;
+ if (flags & LGSS_ROOT_CRED_OST)
+ cred.cr_usr_oss = 1;
+
+ do_svc_downcall(&snd->out_handle, &cred, snd->mech, &snd->ctx_token);
+
+ /* cleanup ctx_token, out_tok is cleaned up in handle_channel_req */
+ free(snd->ctx_token.value);
+ snd->ctx_token.length = 0;
+
+ return 0;
+}
+
static int handle_krb(struct svc_nego_data *snd)
{
u_int32_t ret_flags;
printerr(2, "handling request\n");
if (readline(fileno(f), &lbuf, &lbuflen) != 1) {
- printerr(0, "WARNING: handle_req: failed reading request\n");
+ printerr(0, "WARNING: failed reading request\n");
return -1;
}
}
snd.mech = &krb5oid;
break;
+ case LGSS_MECH_NULL:
+ if (!null_enabled) {
+ printerr(1, "WARNING: Request for gssnull but service "
+ "support not enabled\n");
+ goto ignore;
+ }
+ snd.mech = &nulloid;
+ break;
+ case LGSS_MECH_SK:
+ if (!sk_enabled) {
+ printerr(1, "WARNING: Request for sk but service "
+ "support not enabled\n");
+ goto ignore;
+ }
+ snd.mech = &skoid;
+ break;
default:
printerr(0, "WARNING: invalid mechanism recevied: %d\n",
lustre_mech);
get_len = qword_get(&cp, snd.in_handle.value, sizeof(in_handle_buf));
if (get_len < 0) {
- printerr(0, "WARNING: handle_req: failed parsing request\n");
+ printerr(0, "WARNING: failed parsing request\n");
goto out_err;
}
snd.in_handle.length = (size_t)get_len;
get_len = qword_get(&cp, snd.in_tok.value, sizeof(in_tok_buf));
if (get_len < 0) {
- printerr(0, "WARNING: handle_req: failed parsing request\n");
+ printerr(0, "WARNING: failed parsing request\n");
goto out_err;
}
snd.in_tok.length = (size_t)get_len;
if (snd.in_handle.length != 0) { /* CONTINUE_INIT case */
if (snd.in_handle.length != sizeof(snd.ctx)) {
- printerr(0, "WARNING: handle_req: "
- "input handle has unexpected length %zu\n",
- snd.in_handle.length);
+ printerr(0, "WARNING: input handle has unexpected "
+ "length %zu\n", snd.in_handle.length);
goto out_err;
}
/* in_handle is the context id stored in the out_handle
if (lustre_mech == LGSS_MECH_KRB5)
rc = handle_krb(&snd);
+ else if (lustre_mech == LGSS_MECH_SK)
+ rc = handle_sk(&snd);
+ else if (lustre_mech == LGSS_MECH_NULL)
+ rc = handle_null(&snd);
else
printerr(0, "WARNING: Received or request for"
"subflavor that is not enabled: %d\n", lustre_mech);
ignore:
return 0;
}
-