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f15364bd4c
This adds IPv6 support to the interfaces that are used to express nfsd exports. All addressed are stored internally as IPv6; backwards compatibility is maintained using mapped addresses. Thanks to Bruce Fields, Brian Haley, Neil Brown and Hideaki Joshifuji for comments Signed-off-by: Aurelien Charbon <aurelien.charbon@bull.net> Cc: Neil Brown <neilb@suse.de> Cc: Brian Haley <brian.haley@hp.com> Cc: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
876 lines
20 KiB
C
876 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 <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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/*
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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(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, NIPQUAD_FMT,
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ntohl(im->m_addr.s6_addr32[3]) >> 24 & 0xff,
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ntohl(im->m_addr.s6_addr32[3]) >> 16 & 0xff,
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ntohl(im->m_addr.s6_addr32[3]) >> 8 & 0xff,
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ntohl(im->m_addr.s6_addr32[3]) >> 0 & 0xff);
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} else {
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snprintf(text_addr, 40, NIP6_FMT, NIP6(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 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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int b1, b2, b3, b4, b5, b6, b7, b8;
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char c;
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char class[8];
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struct in6_addr addr;
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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 (sscanf(buf, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) == 4) {
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addr.s6_addr32[0] = 0;
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addr.s6_addr32[1] = 0;
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addr.s6_addr32[2] = htonl(0xffff);
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addr.s6_addr32[3] =
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htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
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} else if (sscanf(buf, NIP6_FMT "%c",
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&b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
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addr.s6_addr16[0] = htons(b1);
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addr.s6_addr16[1] = htons(b2);
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addr.s6_addr16[2] = htons(b3);
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addr.s6_addr16[3] = htons(b4);
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addr.s6_addr16[4] = htons(b5);
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addr.s6_addr16[5] = htons(b6);
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addr.s6_addr16[6] = htons(b7);
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addr.s6_addr16[7] = htons(b8);
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} else
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return -EINVAL;
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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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ipmp = ip_map_lookup(class, &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" NIPQUAD_FMT "%s\n",
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im->m_class,
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ntohl(addr.s6_addr32[3]) >> 24 & 0xff,
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ntohl(addr.s6_addr32[3]) >> 16 & 0xff,
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ntohl(addr.s6_addr32[3]) >> 8 & 0xff,
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ntohl(addr.s6_addr32[3]) >> 0 & 0xff,
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dom);
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} else {
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seq_printf(m, "%s" NIP6_FMT "%s\n",
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im->m_class, NIP6(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_request = ip_map_request,
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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(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(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(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(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;
|
|
struct group_info *gi;
|
|
};
|
|
static struct cache_head *gid_table[GID_HASHMAX];
|
|
|
|
static void unix_gid_put(struct kref *kref)
|
|
{
|
|
struct cache_head *item = container_of(kref, struct cache_head, ref);
|
|
struct unix_gid *ug = container_of(item, struct unix_gid, h);
|
|
if (test_bit(CACHE_VALID, &item->flags) &&
|
|
!test_bit(CACHE_NEGATIVE, &item->flags))
|
|
put_group_info(ug->gi);
|
|
kfree(ug);
|
|
}
|
|
|
|
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 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, "%d %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_request = unix_gid_request,
|
|
.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 int unix_gid_find(uid_t uid, struct group_info **gip,
|
|
struct svc_rqst *rqstp)
|
|
{
|
|
struct unix_gid *ug = unix_gid_lookup(uid);
|
|
if (!ug)
|
|
return -EAGAIN;
|
|
switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
|
|
case -ENOENT:
|
|
*gip = NULL;
|
|
return 0;
|
|
case 0:
|
|
*gip = ug->gi;
|
|
get_group_info(*gip);
|
|
return 0;
|
|
default:
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
int
|
|
svcauth_unix_set_client(struct svc_rqst *rqstp)
|
|
{
|
|
struct sockaddr_in *sin;
|
|
struct sockaddr_in6 *sin6, sin6_storage;
|
|
struct ip_map *ipm;
|
|
|
|
switch (rqstp->rq_addr.ss_family) {
|
|
case AF_INET:
|
|
sin = svc_addr_in(rqstp);
|
|
sin6 = &sin6_storage;
|
|
ipv6_addr_set(&sin6->sin6_addr, 0, 0,
|
|
htonl(0x0000FFFF), sin->sin_addr.s_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 -EAGAIN:
|
|
case -ETIMEDOUT:
|
|
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;
|
|
}
|
|
return SVC_OK;
|
|
}
|
|
|
|
EXPORT_SYMBOL(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_DROP; /* 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;
|
|
if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
|
|
== -EAGAIN)
|
|
return SVC_DROP;
|
|
if (cred->cr_group_info == NULL) {
|
|
cred->cr_group_info = groups_alloc(slen);
|
|
if (cred->cr_group_info == NULL)
|
|
return SVC_DROP;
|
|
for (i = 0; i < slen; i++)
|
|
GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
|
|
} else {
|
|
for (i = 0; i < slen ; 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,
|
|
};
|
|
|