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![NeilBrown](/assets/img/avatar_default.png)
If we drop a request in the sunrpc layer, either due kmalloc failure, or due to a cache miss when we could not queue the request for later replay, then close the connection to encourage the client to retry sooner. Note that if the drop happens in the NFS layer, NFSERR_JUKEBOX (aka NFS4ERR_DELAY) is returned to guide the client concerning replay. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
893 lines
20 KiB
C
893 lines
20 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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#define RPCDBG_FACILITY RPCDBG_AUTH
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#include <linux/sunrpc/clnt.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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int addr_changes;
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/* other stuff later */
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};
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extern struct auth_ops svcauth_unix;
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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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auth_domain_put(&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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new->addr_changes = 0;
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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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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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/**************************************************
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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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#define IP_HASHMASK (IP_HASHMAX-1)
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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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int m_add_change;
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};
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static struct cache_head *ip_table[IP_HASHMAX];
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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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#if IP_HASHBITS == 8
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/* hash_long on a 64 bit machine is currently REALLY BAD for
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* IP addresses in reverse-endian (i.e. on a little-endian machine).
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* So use a trivial but reliable hash instead
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*/
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static inline int hash_ip(__be32 ip)
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{
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int hash = (__force u32)ip ^ ((__force u32)ip>>16);
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return (hash ^ (hash>>8)) & 0xff;
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}
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#endif
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static inline int hash_ip6(struct in6_addr ip)
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{
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return (hash_ip(ip.s6_addr32[0]) ^
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hash_ip(ip.s6_addr32[1]) ^
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hash_ip(ip.s6_addr32[2]) ^
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hash_ip(ip.s6_addr32[3]));
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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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ipv6_addr_copy(&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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new->m_add_change = item->m_add_change;
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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(char *class, struct in6_addr *addr);
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static int ip_map_update(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(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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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
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sin6.sin6_addr.s6_addr32[3] = address.s4.sin_addr.s_addr;
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break;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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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(class, &sin6.sin6_addr);
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if (ipmp) {
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err = ip_map_update(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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ipv6_addr_copy(&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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struct cache_detail ip_map_cache = {
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.owner = THIS_MODULE,
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.hash_size = IP_HASHMAX,
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.hash_table = ip_table,
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.name = "auth.unix.ip",
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.cache_put = ip_map_put,
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.cache_upcall = ip_map_upcall,
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.cache_parse = ip_map_parse,
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.cache_show = ip_map_show,
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.match = ip_map_match,
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.init = ip_map_init,
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.update = update,
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.alloc = ip_map_alloc,
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};
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static struct ip_map *ip_map_lookup(char *class, 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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ipv6_addr_copy(&ip.m_addr, addr);
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ch = sunrpc_cache_lookup(&ip_map_cache, &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 int ip_map_update(struct ip_map *ipm, 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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else {
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ip.m_add_change = udom->addr_changes;
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/* if this is from the legacy set_client system call,
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* we need m_add_change to be one higher
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*/
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if (expiry == NEVER)
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ip.m_add_change++;
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}
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ip.h.expiry_time = expiry;
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ch = sunrpc_cache_update(&ip_map_cache,
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&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, &ip_map_cache);
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return 0;
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}
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int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
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{
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struct unix_domain *udom;
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struct ip_map *ipmp;
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if (dom->flavour != &svcauth_unix)
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return -EINVAL;
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udom = container_of(dom, struct unix_domain, h);
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ipmp = ip_map_lookup("nfsd", addr);
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if (ipmp)
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return ip_map_update(ipmp, udom, NEVER);
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else
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return -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(auth_unix_add_addr);
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int auth_unix_forget_old(struct auth_domain *dom)
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{
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struct unix_domain *udom;
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if (dom->flavour != &svcauth_unix)
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return -EINVAL;
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udom = container_of(dom, struct unix_domain, h);
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udom->addr_changes++;
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return 0;
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}
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EXPORT_SYMBOL_GPL(auth_unix_forget_old);
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struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
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{
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struct ip_map *ipm;
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struct auth_domain *rv;
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ipm = ip_map_lookup("nfsd", addr);
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if (!ipm)
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return NULL;
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if (cache_check(&ip_map_cache, &ipm->h, NULL))
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return NULL;
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if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
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if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
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auth_domain_put(&ipm->m_client->h);
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rv = NULL;
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} else {
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rv = &ipm->m_client->h;
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kref_get(&rv->ref);
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}
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cache_put(&ipm->h, &ip_map_cache);
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return rv;
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}
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EXPORT_SYMBOL_GPL(auth_unix_lookup);
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void svcauth_unix_purge(void)
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{
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cache_purge(&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_rqst *rqstp)
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{
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struct ip_map *ipm = NULL;
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struct svc_xprt *xprt = rqstp->rq_xprt;
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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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xprt->xpt_auth_cache = NULL;
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spin_unlock(&xprt->xpt_lock);
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cache_put(&ipm->h, &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_rqst *rqstp, struct ip_map *ipm)
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{
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struct svc_xprt *xprt = rqstp->rq_xprt;
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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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cache_put(&ipm->h, &ip_map_cache);
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}
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void
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svcauth_unix_info_release(void *info)
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{
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struct ip_map *ipm = info;
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cache_put(&ipm->h, &ip_map_cache);
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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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#define GID_HASHMASK (GID_HASHMAX - 1)
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struct unix_gid {
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struct cache_head h;
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uid_t uid;
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struct group_info *gi;
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};
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static struct cache_head *gid_table[GID_HASHMAX];
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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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|
}
|
|
|
|
static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
|
|
{
|
|
struct unix_gid *orig = container_of(corig, struct unix_gid, h);
|
|
struct unix_gid *new = container_of(cnew, struct unix_gid, h);
|
|
return orig->uid == new->uid;
|
|
}
|
|
static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
|
|
{
|
|
struct unix_gid *new = container_of(cnew, struct unix_gid, h);
|
|
struct unix_gid *item = container_of(citem, struct unix_gid, h);
|
|
new->uid = item->uid;
|
|
}
|
|
static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
|
|
{
|
|
struct unix_gid *new = container_of(cnew, struct unix_gid, h);
|
|
struct unix_gid *item = container_of(citem, struct unix_gid, h);
|
|
|
|
get_group_info(item->gi);
|
|
new->gi = item->gi;
|
|
}
|
|
static struct cache_head *unix_gid_alloc(void)
|
|
{
|
|
struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
|
|
if (g)
|
|
return &g->h;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static void unix_gid_request(struct cache_detail *cd,
|
|
struct cache_head *h,
|
|
char **bpp, int *blen)
|
|
{
|
|
char tuid[20];
|
|
struct unix_gid *ug = container_of(h, struct unix_gid, h);
|
|
|
|
snprintf(tuid, 20, "%u", ug->uid);
|
|
qword_add(bpp, blen, tuid);
|
|
(*bpp)[-1] = '\n';
|
|
}
|
|
|
|
static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
|
|
{
|
|
return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
|
|
}
|
|
|
|
static struct unix_gid *unix_gid_lookup(uid_t uid);
|
|
extern struct cache_detail unix_gid_cache;
|
|
|
|
static int unix_gid_parse(struct cache_detail *cd,
|
|
char *mesg, int mlen)
|
|
{
|
|
/* uid expiry Ngid gid0 gid1 ... gidN-1 */
|
|
int uid;
|
|
int gids;
|
|
int rv;
|
|
int i;
|
|
int err;
|
|
time_t expiry;
|
|
struct unix_gid ug, *ugp;
|
|
|
|
if (mlen <= 0 || mesg[mlen-1] != '\n')
|
|
return -EINVAL;
|
|
mesg[mlen-1] = 0;
|
|
|
|
rv = get_int(&mesg, &uid);
|
|
if (rv)
|
|
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;
|
|
rv = get_int(&mesg, &gid);
|
|
err = -EINVAL;
|
|
if (rv)
|
|
goto out;
|
|
GROUP_AT(ug.gi, i) = gid;
|
|
}
|
|
|
|
ugp = unix_gid_lookup(uid);
|
|
if (ugp) {
|
|
struct cache_head *ch;
|
|
ug.h.flags = 0;
|
|
ug.h.expiry_time = expiry;
|
|
ch = sunrpc_cache_update(&unix_gid_cache,
|
|
&ug.h, &ugp->h,
|
|
hash_long(uid, GID_HASHBITS));
|
|
if (!ch)
|
|
err = -ENOMEM;
|
|
else {
|
|
err = 0;
|
|
cache_put(ch, &unix_gid_cache);
|
|
}
|
|
} 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 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:", ug->uid, glen);
|
|
for (i = 0; i < glen; i++)
|
|
seq_printf(m, " %d", GROUP_AT(ug->gi, i));
|
|
seq_printf(m, "\n");
|
|
return 0;
|
|
}
|
|
|
|
struct cache_detail unix_gid_cache = {
|
|
.owner = THIS_MODULE,
|
|
.hash_size = GID_HASHMAX,
|
|
.hash_table = gid_table,
|
|
.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,
|
|
};
|
|
|
|
static struct unix_gid *unix_gid_lookup(uid_t uid)
|
|
{
|
|
struct unix_gid ug;
|
|
struct cache_head *ch;
|
|
|
|
ug.uid = uid;
|
|
ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
|
|
hash_long(uid, GID_HASHBITS));
|
|
if (ch)
|
|
return container_of(ch, struct unix_gid, h);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
|
|
{
|
|
struct unix_gid *ug;
|
|
struct group_info *gi;
|
|
int ret;
|
|
|
|
ug = unix_gid_lookup(uid);
|
|
if (!ug)
|
|
return ERR_PTR(-EAGAIN);
|
|
ret = cache_check(&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, &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;
|
|
|
|
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(rqstp);
|
|
if (ipm == NULL)
|
|
ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
|
|
&sin6->sin6_addr);
|
|
|
|
if (ipm == NULL)
|
|
return SVC_DENIED;
|
|
|
|
switch (cache_check(&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(rqstp, 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;
|
|
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 = (uid_t) -1;
|
|
cred->cr_gid = (gid_t) -1;
|
|
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_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;
|
|
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++)
|
|
GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
|
|
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_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,
|
|
};
|
|
|