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![Eric W. Biederman](/assets/img/avatar_default.png)
When a new rpc connection is established with an in-kernel server, the traffic passes through svc_process_common, and svc_set_client and down into svcauth_unix_set_client if it is of type RPC_AUTH_NULL or RPC_AUTH_UNIX. svcauth_unix_set_client then looks at the uid of the credential we have assigned to the incomming client and if we don't have the groups already cached makes an upcall to get a list of groups that the client can use. The upcall encodes send a rpc message to user space encoding the uid of the user whose groups we want to know. Encode the kuid of the user in the initial user namespace as nfs mounts can only happen today in the initial user namespace. When a reply to an upcall comes in convert interpret the uid and gid values from the rpc pipe as uids and gids in the initial user namespace and convert them into kuids and kgids before processing them further. When reading proc files listing the uid to gid list cache convert the kuids and kgids from into uids and gids the initial user namespace. As we are displaying server internal details it makes sense to display these values from the servers perspective. Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
922 lines
21 KiB
C
922 lines
21 KiB
C
#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/svcauth.h>
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#include <linux/sunrpc/gss_api.h>
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#include <linux/err.h>
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#include <linux/seq_file.h>
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#include <linux/hash.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/ipv6.h>
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#include <linux/kernel.h>
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#include <linux/user_namespace.h>
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#define RPCDBG_FACILITY RPCDBG_AUTH
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#include <linux/sunrpc/clnt.h>
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#include "netns.h"
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/*
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* AUTHUNIX and AUTHNULL credentials are both handled here.
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* AUTHNULL is treated just like AUTHUNIX except that the uid/gid
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* are always nobody (-2). i.e. we do the same IP address checks for
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* AUTHNULL as for AUTHUNIX, and that is done here.
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*/
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struct unix_domain {
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struct auth_domain h;
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/* other stuff later */
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};
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extern struct auth_ops svcauth_null;
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extern struct auth_ops svcauth_unix;
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static void svcauth_unix_domain_release(struct auth_domain *dom)
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{
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struct unix_domain *ud = container_of(dom, struct unix_domain, h);
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kfree(dom->name);
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kfree(ud);
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}
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struct auth_domain *unix_domain_find(char *name)
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{
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struct auth_domain *rv;
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struct unix_domain *new = NULL;
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rv = auth_domain_lookup(name, NULL);
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while(1) {
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if (rv) {
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if (new && rv != &new->h)
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svcauth_unix_domain_release(&new->h);
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if (rv->flavour != &svcauth_unix) {
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auth_domain_put(rv);
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return NULL;
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}
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return rv;
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}
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new = kmalloc(sizeof(*new), GFP_KERNEL);
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if (new == NULL)
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return NULL;
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kref_init(&new->h.ref);
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new->h.name = kstrdup(name, GFP_KERNEL);
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if (new->h.name == NULL) {
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kfree(new);
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return NULL;
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}
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new->h.flavour = &svcauth_unix;
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rv = auth_domain_lookup(name, &new->h);
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}
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}
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EXPORT_SYMBOL_GPL(unix_domain_find);
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/**************************************************
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* cache for IP address to unix_domain
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* as needed by AUTH_UNIX
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*/
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#define IP_HASHBITS 8
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#define IP_HASHMAX (1<<IP_HASHBITS)
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struct ip_map {
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struct cache_head h;
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char m_class[8]; /* e.g. "nfsd" */
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struct in6_addr m_addr;
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struct unix_domain *m_client;
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};
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static void ip_map_put(struct kref *kref)
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{
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struct cache_head *item = container_of(kref, struct cache_head, ref);
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struct ip_map *im = container_of(item, struct ip_map,h);
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if (test_bit(CACHE_VALID, &item->flags) &&
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!test_bit(CACHE_NEGATIVE, &item->flags))
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auth_domain_put(&im->m_client->h);
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kfree(im);
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}
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static inline int hash_ip6(const struct in6_addr *ip)
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{
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return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
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}
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static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
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{
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struct ip_map *orig = container_of(corig, struct ip_map, h);
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struct ip_map *new = container_of(cnew, struct ip_map, h);
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return strcmp(orig->m_class, new->m_class) == 0 &&
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ipv6_addr_equal(&orig->m_addr, &new->m_addr);
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}
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static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
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{
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struct ip_map *new = container_of(cnew, struct ip_map, h);
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struct ip_map *item = container_of(citem, struct ip_map, h);
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strcpy(new->m_class, item->m_class);
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new->m_addr = item->m_addr;
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}
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static void update(struct cache_head *cnew, struct cache_head *citem)
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{
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struct ip_map *new = container_of(cnew, struct ip_map, h);
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struct ip_map *item = container_of(citem, struct ip_map, h);
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kref_get(&item->m_client->h.ref);
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new->m_client = item->m_client;
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}
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static struct cache_head *ip_map_alloc(void)
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{
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struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
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if (i)
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return &i->h;
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else
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return NULL;
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}
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static void ip_map_request(struct cache_detail *cd,
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struct cache_head *h,
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char **bpp, int *blen)
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{
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char text_addr[40];
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struct ip_map *im = container_of(h, struct ip_map, h);
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if (ipv6_addr_v4mapped(&(im->m_addr))) {
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snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
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} else {
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snprintf(text_addr, 40, "%pI6", &im->m_addr);
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}
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qword_add(bpp, blen, im->m_class);
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qword_add(bpp, blen, text_addr);
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(*bpp)[-1] = '\n';
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}
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static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
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{
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return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
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}
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static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
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static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
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static int ip_map_parse(struct cache_detail *cd,
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char *mesg, int mlen)
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{
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/* class ipaddress [domainname] */
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/* should be safe just to use the start of the input buffer
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* for scratch: */
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char *buf = mesg;
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int len;
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char class[8];
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union {
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struct sockaddr sa;
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struct sockaddr_in s4;
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struct sockaddr_in6 s6;
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} address;
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struct sockaddr_in6 sin6;
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int err;
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struct ip_map *ipmp;
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struct auth_domain *dom;
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time_t expiry;
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if (mesg[mlen-1] != '\n')
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return -EINVAL;
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mesg[mlen-1] = 0;
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/* class */
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len = qword_get(&mesg, class, sizeof(class));
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if (len <= 0) return -EINVAL;
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/* ip address */
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len = qword_get(&mesg, buf, mlen);
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if (len <= 0) return -EINVAL;
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if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
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return -EINVAL;
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switch (address.sa.sa_family) {
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case AF_INET:
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/* Form a mapped IPv4 address in sin6 */
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sin6.sin6_family = AF_INET6;
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ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
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&sin6.sin6_addr);
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6:
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memcpy(&sin6, &address.s6, sizeof(sin6));
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break;
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#endif
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default:
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return -EINVAL;
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}
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expiry = get_expiry(&mesg);
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if (expiry ==0)
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return -EINVAL;
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/* domainname, or empty for NEGATIVE */
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len = qword_get(&mesg, buf, mlen);
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if (len < 0) return -EINVAL;
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if (len) {
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dom = unix_domain_find(buf);
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if (dom == NULL)
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return -ENOENT;
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} else
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dom = NULL;
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/* IPv6 scope IDs are ignored for now */
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ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
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if (ipmp) {
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err = __ip_map_update(cd, ipmp,
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container_of(dom, struct unix_domain, h),
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expiry);
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} else
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err = -ENOMEM;
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if (dom)
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auth_domain_put(dom);
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cache_flush();
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return err;
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}
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static int ip_map_show(struct seq_file *m,
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struct cache_detail *cd,
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struct cache_head *h)
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{
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struct ip_map *im;
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struct in6_addr addr;
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char *dom = "-no-domain-";
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if (h == NULL) {
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seq_puts(m, "#class IP domain\n");
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return 0;
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}
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im = container_of(h, struct ip_map, h);
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/* class addr domain */
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addr = im->m_addr;
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if (test_bit(CACHE_VALID, &h->flags) &&
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!test_bit(CACHE_NEGATIVE, &h->flags))
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dom = im->m_client->h.name;
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if (ipv6_addr_v4mapped(&addr)) {
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seq_printf(m, "%s %pI4 %s\n",
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im->m_class, &addr.s6_addr32[3], dom);
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} else {
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seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
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}
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return 0;
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}
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static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
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struct in6_addr *addr)
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{
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struct ip_map ip;
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struct cache_head *ch;
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strcpy(ip.m_class, class);
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ip.m_addr = *addr;
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ch = sunrpc_cache_lookup(cd, &ip.h,
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hash_str(class, IP_HASHBITS) ^
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hash_ip6(addr));
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if (ch)
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return container_of(ch, struct ip_map, h);
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else
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return NULL;
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}
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static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
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struct in6_addr *addr)
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{
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struct sunrpc_net *sn;
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sn = net_generic(net, sunrpc_net_id);
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return __ip_map_lookup(sn->ip_map_cache, class, addr);
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}
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static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
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struct unix_domain *udom, time_t expiry)
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{
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struct ip_map ip;
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struct cache_head *ch;
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ip.m_client = udom;
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ip.h.flags = 0;
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if (!udom)
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set_bit(CACHE_NEGATIVE, &ip.h.flags);
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ip.h.expiry_time = expiry;
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ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
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hash_str(ipm->m_class, IP_HASHBITS) ^
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hash_ip6(&ipm->m_addr));
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if (!ch)
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return -ENOMEM;
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cache_put(ch, cd);
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return 0;
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}
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static inline int ip_map_update(struct net *net, struct ip_map *ipm,
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struct unix_domain *udom, time_t expiry)
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{
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struct sunrpc_net *sn;
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sn = net_generic(net, sunrpc_net_id);
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return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
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}
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void svcauth_unix_purge(struct net *net)
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{
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struct sunrpc_net *sn;
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sn = net_generic(net, sunrpc_net_id);
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cache_purge(sn->ip_map_cache);
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}
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EXPORT_SYMBOL_GPL(svcauth_unix_purge);
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static inline struct ip_map *
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ip_map_cached_get(struct svc_xprt *xprt)
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{
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struct ip_map *ipm = NULL;
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struct sunrpc_net *sn;
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if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
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spin_lock(&xprt->xpt_lock);
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ipm = xprt->xpt_auth_cache;
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if (ipm != NULL) {
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if (!cache_valid(&ipm->h)) {
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/*
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* The entry has been invalidated since it was
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* remembered, e.g. by a second mount from the
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* same IP address.
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*/
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sn = net_generic(xprt->xpt_net, sunrpc_net_id);
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xprt->xpt_auth_cache = NULL;
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spin_unlock(&xprt->xpt_lock);
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cache_put(&ipm->h, sn->ip_map_cache);
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return NULL;
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}
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cache_get(&ipm->h);
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}
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spin_unlock(&xprt->xpt_lock);
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}
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return ipm;
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}
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static inline void
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ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
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{
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if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
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spin_lock(&xprt->xpt_lock);
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if (xprt->xpt_auth_cache == NULL) {
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/* newly cached, keep the reference */
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xprt->xpt_auth_cache = ipm;
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ipm = NULL;
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}
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spin_unlock(&xprt->xpt_lock);
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}
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if (ipm) {
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struct sunrpc_net *sn;
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sn = net_generic(xprt->xpt_net, sunrpc_net_id);
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cache_put(&ipm->h, sn->ip_map_cache);
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}
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}
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void
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svcauth_unix_info_release(struct svc_xprt *xpt)
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{
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struct ip_map *ipm;
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ipm = xpt->xpt_auth_cache;
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if (ipm != NULL) {
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struct sunrpc_net *sn;
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sn = net_generic(xpt->xpt_net, sunrpc_net_id);
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cache_put(&ipm->h, sn->ip_map_cache);
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}
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}
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/****************************************************************************
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* auth.unix.gid cache
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* simple cache to map a UID to a list of GIDs
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* because AUTH_UNIX aka AUTH_SYS has a max of 16
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*/
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#define GID_HASHBITS 8
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#define GID_HASHMAX (1<<GID_HASHBITS)
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struct unix_gid {
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struct cache_head h;
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kuid_t uid;
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struct group_info *gi;
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};
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static int unix_gid_hash(kuid_t uid)
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{
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return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
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}
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static void unix_gid_put(struct kref *kref)
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{
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struct cache_head *item = container_of(kref, struct cache_head, ref);
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struct unix_gid *ug = container_of(item, struct unix_gid, h);
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if (test_bit(CACHE_VALID, &item->flags) &&
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!test_bit(CACHE_NEGATIVE, &item->flags))
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put_group_info(ug->gi);
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kfree(ug);
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}
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static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
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{
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struct unix_gid *orig = container_of(corig, struct unix_gid, h);
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struct unix_gid *new = container_of(cnew, struct unix_gid, h);
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return uid_eq(orig->uid, new->uid);
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}
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static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
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{
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struct unix_gid *new = container_of(cnew, struct unix_gid, h);
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struct unix_gid *item = container_of(citem, struct unix_gid, h);
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new->uid = item->uid;
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}
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static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
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{
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struct unix_gid *new = container_of(cnew, struct unix_gid, h);
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struct unix_gid *item = container_of(citem, struct unix_gid, h);
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get_group_info(item->gi);
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new->gi = item->gi;
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}
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static struct cache_head *unix_gid_alloc(void)
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{
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struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
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if (g)
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return &g->h;
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else
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return NULL;
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}
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static void unix_gid_request(struct cache_detail *cd,
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struct cache_head *h,
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char **bpp, int *blen)
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{
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char tuid[20];
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struct unix_gid *ug = container_of(h, struct unix_gid, h);
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snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
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qword_add(bpp, blen, tuid);
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(*bpp)[-1] = '\n';
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}
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static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
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{
|
|
return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
|
|
}
|
|
|
|
static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
|
|
|
|
static int unix_gid_parse(struct cache_detail *cd,
|
|
char *mesg, int mlen)
|
|
{
|
|
/* uid expiry Ngid gid0 gid1 ... gidN-1 */
|
|
int id;
|
|
kuid_t uid;
|
|
int gids;
|
|
int rv;
|
|
int i;
|
|
int err;
|
|
time_t expiry;
|
|
struct unix_gid ug, *ugp;
|
|
|
|
if (mesg[mlen - 1] != '\n')
|
|
return -EINVAL;
|
|
mesg[mlen-1] = 0;
|
|
|
|
rv = get_int(&mesg, &id);
|
|
if (rv)
|
|
return -EINVAL;
|
|
uid = make_kuid(&init_user_ns, id);
|
|
if (!uid_valid(uid))
|
|
return -EINVAL;
|
|
ug.uid = uid;
|
|
|
|
expiry = get_expiry(&mesg);
|
|
if (expiry == 0)
|
|
return -EINVAL;
|
|
|
|
rv = get_int(&mesg, &gids);
|
|
if (rv || gids < 0 || gids > 8192)
|
|
return -EINVAL;
|
|
|
|
ug.gi = groups_alloc(gids);
|
|
if (!ug.gi)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0 ; i < gids ; i++) {
|
|
int gid;
|
|
kgid_t kgid;
|
|
rv = get_int(&mesg, &gid);
|
|
err = -EINVAL;
|
|
if (rv)
|
|
goto out;
|
|
kgid = make_kgid(&init_user_ns, gid);
|
|
if (!gid_valid(kgid))
|
|
goto out;
|
|
GROUP_AT(ug.gi, i) = kgid;
|
|
}
|
|
|
|
ugp = unix_gid_lookup(cd, uid);
|
|
if (ugp) {
|
|
struct cache_head *ch;
|
|
ug.h.flags = 0;
|
|
ug.h.expiry_time = expiry;
|
|
ch = sunrpc_cache_update(cd,
|
|
&ug.h, &ugp->h,
|
|
unix_gid_hash(uid));
|
|
if (!ch)
|
|
err = -ENOMEM;
|
|
else {
|
|
err = 0;
|
|
cache_put(ch, cd);
|
|
}
|
|
} else
|
|
err = -ENOMEM;
|
|
out:
|
|
if (ug.gi)
|
|
put_group_info(ug.gi);
|
|
return err;
|
|
}
|
|
|
|
static int unix_gid_show(struct seq_file *m,
|
|
struct cache_detail *cd,
|
|
struct cache_head *h)
|
|
{
|
|
struct user_namespace *user_ns = &init_user_ns;
|
|
struct unix_gid *ug;
|
|
int i;
|
|
int glen;
|
|
|
|
if (h == NULL) {
|
|
seq_puts(m, "#uid cnt: gids...\n");
|
|
return 0;
|
|
}
|
|
ug = container_of(h, struct unix_gid, h);
|
|
if (test_bit(CACHE_VALID, &h->flags) &&
|
|
!test_bit(CACHE_NEGATIVE, &h->flags))
|
|
glen = ug->gi->ngroups;
|
|
else
|
|
glen = 0;
|
|
|
|
seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
|
|
for (i = 0; i < glen; i++)
|
|
seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
|
|
seq_printf(m, "\n");
|
|
return 0;
|
|
}
|
|
|
|
static struct cache_detail unix_gid_cache_template = {
|
|
.owner = THIS_MODULE,
|
|
.hash_size = GID_HASHMAX,
|
|
.name = "auth.unix.gid",
|
|
.cache_put = unix_gid_put,
|
|
.cache_upcall = unix_gid_upcall,
|
|
.cache_parse = unix_gid_parse,
|
|
.cache_show = unix_gid_show,
|
|
.match = unix_gid_match,
|
|
.init = unix_gid_init,
|
|
.update = unix_gid_update,
|
|
.alloc = unix_gid_alloc,
|
|
};
|
|
|
|
int unix_gid_cache_create(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd;
|
|
int err;
|
|
|
|
cd = cache_create_net(&unix_gid_cache_template, net);
|
|
if (IS_ERR(cd))
|
|
return PTR_ERR(cd);
|
|
err = cache_register_net(cd, net);
|
|
if (err) {
|
|
cache_destroy_net(cd, net);
|
|
return err;
|
|
}
|
|
sn->unix_gid_cache = cd;
|
|
return 0;
|
|
}
|
|
|
|
void unix_gid_cache_destroy(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd = sn->unix_gid_cache;
|
|
|
|
sn->unix_gid_cache = NULL;
|
|
cache_purge(cd);
|
|
cache_unregister_net(cd, net);
|
|
cache_destroy_net(cd, net);
|
|
}
|
|
|
|
static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
|
|
{
|
|
struct unix_gid ug;
|
|
struct cache_head *ch;
|
|
|
|
ug.uid = uid;
|
|
ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
|
|
if (ch)
|
|
return container_of(ch, struct unix_gid, h);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
|
|
{
|
|
struct unix_gid *ug;
|
|
struct group_info *gi;
|
|
int ret;
|
|
struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
|
|
sunrpc_net_id);
|
|
|
|
ug = unix_gid_lookup(sn->unix_gid_cache, uid);
|
|
if (!ug)
|
|
return ERR_PTR(-EAGAIN);
|
|
ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
|
|
switch (ret) {
|
|
case -ENOENT:
|
|
return ERR_PTR(-ENOENT);
|
|
case -ETIMEDOUT:
|
|
return ERR_PTR(-ESHUTDOWN);
|
|
case 0:
|
|
gi = get_group_info(ug->gi);
|
|
cache_put(&ug->h, sn->unix_gid_cache);
|
|
return gi;
|
|
default:
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
}
|
|
|
|
int
|
|
svcauth_unix_set_client(struct svc_rqst *rqstp)
|
|
{
|
|
struct sockaddr_in *sin;
|
|
struct sockaddr_in6 *sin6, sin6_storage;
|
|
struct ip_map *ipm;
|
|
struct group_info *gi;
|
|
struct svc_cred *cred = &rqstp->rq_cred;
|
|
struct svc_xprt *xprt = rqstp->rq_xprt;
|
|
struct net *net = xprt->xpt_net;
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
switch (rqstp->rq_addr.ss_family) {
|
|
case AF_INET:
|
|
sin = svc_addr_in(rqstp);
|
|
sin6 = &sin6_storage;
|
|
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
|
|
break;
|
|
case AF_INET6:
|
|
sin6 = svc_addr_in6(rqstp);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
rqstp->rq_client = NULL;
|
|
if (rqstp->rq_proc == 0)
|
|
return SVC_OK;
|
|
|
|
ipm = ip_map_cached_get(xprt);
|
|
if (ipm == NULL)
|
|
ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
|
|
&sin6->sin6_addr);
|
|
|
|
if (ipm == NULL)
|
|
return SVC_DENIED;
|
|
|
|
switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
|
|
default:
|
|
BUG();
|
|
case -ETIMEDOUT:
|
|
return SVC_CLOSE;
|
|
case -EAGAIN:
|
|
return SVC_DROP;
|
|
case -ENOENT:
|
|
return SVC_DENIED;
|
|
case 0:
|
|
rqstp->rq_client = &ipm->m_client->h;
|
|
kref_get(&rqstp->rq_client->ref);
|
|
ip_map_cached_put(xprt, ipm);
|
|
break;
|
|
}
|
|
|
|
gi = unix_gid_find(cred->cr_uid, rqstp);
|
|
switch (PTR_ERR(gi)) {
|
|
case -EAGAIN:
|
|
return SVC_DROP;
|
|
case -ESHUTDOWN:
|
|
return SVC_CLOSE;
|
|
case -ENOENT:
|
|
break;
|
|
default:
|
|
put_group_info(cred->cr_group_info);
|
|
cred->cr_group_info = gi;
|
|
}
|
|
return SVC_OK;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
|
|
|
|
static int
|
|
svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
|
|
{
|
|
struct kvec *argv = &rqstp->rq_arg.head[0];
|
|
struct kvec *resv = &rqstp->rq_res.head[0];
|
|
struct svc_cred *cred = &rqstp->rq_cred;
|
|
|
|
cred->cr_group_info = NULL;
|
|
cred->cr_principal = NULL;
|
|
rqstp->rq_client = NULL;
|
|
|
|
if (argv->iov_len < 3*4)
|
|
return SVC_GARBAGE;
|
|
|
|
if (svc_getu32(argv) != 0) {
|
|
dprintk("svc: bad null cred\n");
|
|
*authp = rpc_autherr_badcred;
|
|
return SVC_DENIED;
|
|
}
|
|
if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
|
|
dprintk("svc: bad null verf\n");
|
|
*authp = rpc_autherr_badverf;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
/* Signal that mapping to nobody uid/gid is required */
|
|
cred->cr_uid = INVALID_UID;
|
|
cred->cr_gid = INVALID_GID;
|
|
cred->cr_group_info = groups_alloc(0);
|
|
if (cred->cr_group_info == NULL)
|
|
return SVC_CLOSE; /* kmalloc failure - client must retry */
|
|
|
|
/* Put NULL verifier */
|
|
svc_putnl(resv, RPC_AUTH_NULL);
|
|
svc_putnl(resv, 0);
|
|
|
|
rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
|
|
return SVC_OK;
|
|
}
|
|
|
|
static int
|
|
svcauth_null_release(struct svc_rqst *rqstp)
|
|
{
|
|
if (rqstp->rq_client)
|
|
auth_domain_put(rqstp->rq_client);
|
|
rqstp->rq_client = NULL;
|
|
if (rqstp->rq_cred.cr_group_info)
|
|
put_group_info(rqstp->rq_cred.cr_group_info);
|
|
rqstp->rq_cred.cr_group_info = NULL;
|
|
|
|
return 0; /* don't drop */
|
|
}
|
|
|
|
|
|
struct auth_ops svcauth_null = {
|
|
.name = "null",
|
|
.owner = THIS_MODULE,
|
|
.flavour = RPC_AUTH_NULL,
|
|
.accept = svcauth_null_accept,
|
|
.release = svcauth_null_release,
|
|
.set_client = svcauth_unix_set_client,
|
|
};
|
|
|
|
|
|
static int
|
|
svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
|
|
{
|
|
struct kvec *argv = &rqstp->rq_arg.head[0];
|
|
struct kvec *resv = &rqstp->rq_res.head[0];
|
|
struct svc_cred *cred = &rqstp->rq_cred;
|
|
u32 slen, i;
|
|
int len = argv->iov_len;
|
|
|
|
cred->cr_group_info = NULL;
|
|
cred->cr_principal = NULL;
|
|
rqstp->rq_client = NULL;
|
|
|
|
if ((len -= 3*4) < 0)
|
|
return SVC_GARBAGE;
|
|
|
|
svc_getu32(argv); /* length */
|
|
svc_getu32(argv); /* time stamp */
|
|
slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
|
|
if (slen > 64 || (len -= (slen + 3)*4) < 0)
|
|
goto badcred;
|
|
argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
|
|
argv->iov_len -= slen*4;
|
|
|
|
cred->cr_uid = svc_getnl(argv); /* uid */
|
|
cred->cr_gid = svc_getnl(argv); /* gid */
|
|
slen = svc_getnl(argv); /* gids length */
|
|
if (slen > 16 || (len -= (slen + 2)*4) < 0)
|
|
goto badcred;
|
|
cred->cr_group_info = groups_alloc(slen);
|
|
if (cred->cr_group_info == NULL)
|
|
return SVC_CLOSE;
|
|
for (i = 0; i < slen; i++) {
|
|
kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
|
|
if (!gid_valid(kgid))
|
|
goto badcred;
|
|
GROUP_AT(cred->cr_group_info, i) = kgid;
|
|
}
|
|
if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
|
|
*authp = rpc_autherr_badverf;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
/* Put NULL verifier */
|
|
svc_putnl(resv, RPC_AUTH_NULL);
|
|
svc_putnl(resv, 0);
|
|
|
|
rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
|
|
return SVC_OK;
|
|
|
|
badcred:
|
|
*authp = rpc_autherr_badcred;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
static int
|
|
svcauth_unix_release(struct svc_rqst *rqstp)
|
|
{
|
|
/* Verifier (such as it is) is already in place.
|
|
*/
|
|
if (rqstp->rq_client)
|
|
auth_domain_put(rqstp->rq_client);
|
|
rqstp->rq_client = NULL;
|
|
if (rqstp->rq_cred.cr_group_info)
|
|
put_group_info(rqstp->rq_cred.cr_group_info);
|
|
rqstp->rq_cred.cr_group_info = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct auth_ops svcauth_unix = {
|
|
.name = "unix",
|
|
.owner = THIS_MODULE,
|
|
.flavour = RPC_AUTH_UNIX,
|
|
.accept = svcauth_unix_accept,
|
|
.release = svcauth_unix_release,
|
|
.domain_release = svcauth_unix_domain_release,
|
|
.set_client = svcauth_unix_set_client,
|
|
};
|
|
|
|
static struct cache_detail ip_map_cache_template = {
|
|
.owner = THIS_MODULE,
|
|
.hash_size = IP_HASHMAX,
|
|
.name = "auth.unix.ip",
|
|
.cache_put = ip_map_put,
|
|
.cache_upcall = ip_map_upcall,
|
|
.cache_parse = ip_map_parse,
|
|
.cache_show = ip_map_show,
|
|
.match = ip_map_match,
|
|
.init = ip_map_init,
|
|
.update = update,
|
|
.alloc = ip_map_alloc,
|
|
};
|
|
|
|
int ip_map_cache_create(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd;
|
|
int err;
|
|
|
|
cd = cache_create_net(&ip_map_cache_template, net);
|
|
if (IS_ERR(cd))
|
|
return PTR_ERR(cd);
|
|
err = cache_register_net(cd, net);
|
|
if (err) {
|
|
cache_destroy_net(cd, net);
|
|
return err;
|
|
}
|
|
sn->ip_map_cache = cd;
|
|
return 0;
|
|
}
|
|
|
|
void ip_map_cache_destroy(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd = sn->ip_map_cache;
|
|
|
|
sn->ip_map_cache = NULL;
|
|
cache_purge(cd);
|
|
cache_unregister_net(cd, net);
|
|
cache_destroy_net(cd, net);
|
|
}
|