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502 lines
11 KiB
502 lines
11 KiB
#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/err.h>
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#include <linux/seq_file.h>
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#include <linux/hash.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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static char *strdup(char *s)
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{
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char *rv = kmalloc(strlen(s)+1, GFP_KERNEL);
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if (rv)
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strcpy(rv, s);
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return rv;
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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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struct auth_domain *unix_domain_find(char *name)
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{
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struct auth_domain *rv, ud;
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struct unix_domain *new;
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ud.name = name;
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rv = auth_domain_lookup(&ud, 0);
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foundit:
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if (rv && rv->flavour != RPC_AUTH_UNIX) {
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auth_domain_put(rv);
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return NULL;
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}
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if (rv)
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return rv;
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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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cache_init(&new->h.h);
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new->h.name = strdup(name);
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new->h.flavour = RPC_AUTH_UNIX;
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new->addr_changes = 0;
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new->h.h.expiry_time = NEVER;
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rv = auth_domain_lookup(&new->h, 2);
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if (rv == &new->h) {
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if (atomic_dec_and_test(&new->h.h.refcnt)) BUG();
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} else {
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auth_domain_put(&new->h);
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goto foundit;
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}
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return rv;
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}
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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 in_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 cache_head *item, struct cache_detail *cd)
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{
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struct ip_map *im = container_of(item, struct ip_map,h);
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if (cache_put(item, cd)) {
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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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}
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static inline int ip_map_hash(struct ip_map *item)
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{
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return hash_str(item->m_class, IP_HASHBITS) ^
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hash_long((unsigned long)item->m_addr.s_addr, IP_HASHBITS);
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}
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static inline int ip_map_match(struct ip_map *item, struct ip_map *tmp)
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{
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return strcmp(tmp->m_class, item->m_class) == 0
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&& tmp->m_addr.s_addr == item->m_addr.s_addr;
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}
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static inline void ip_map_init(struct ip_map *new, struct ip_map *item)
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{
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strcpy(new->m_class, item->m_class);
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new->m_addr.s_addr = item->m_addr.s_addr;
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}
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static inline void ip_map_update(struct ip_map *new, struct ip_map *item)
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{
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cache_get(&item->m_client->h.h);
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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 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[20];
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struct ip_map *im = container_of(h, struct ip_map, h);
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__u32 addr = im->m_addr.s_addr;
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snprintf(text_addr, 20, "%u.%u.%u.%u",
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ntohl(addr) >> 24 & 0xff,
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ntohl(addr) >> 16 & 0xff,
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ntohl(addr) >> 8 & 0xff,
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ntohl(addr) >> 0 & 0xff);
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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(struct ip_map *, int);
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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;
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char c;
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struct ip_map ipm, *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, ipm.m_class, sizeof(ipm.m_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, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
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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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ipm.m_addr.s_addr =
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htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
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ipm.h.flags = 0;
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if (dom) {
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ipm.m_client = container_of(dom, struct unix_domain, h);
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ipm.m_add_change = ipm.m_client->addr_changes;
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} else
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set_bit(CACHE_NEGATIVE, &ipm.h.flags);
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ipm.h.expiry_time = expiry;
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ipmp = ip_map_lookup(&ipm, 1);
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if (ipmp)
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ip_map_put(&ipmp->h, &ip_map_cache);
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if (dom)
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auth_domain_put(dom);
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if (!ipmp)
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return -ENOMEM;
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cache_flush();
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return 0;
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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 in_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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seq_printf(m, "%s %d.%d.%d.%d %s\n",
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im->m_class,
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htonl(addr.s_addr) >> 24 & 0xff,
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htonl(addr.s_addr) >> 16 & 0xff,
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htonl(addr.s_addr) >> 8 & 0xff,
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htonl(addr.s_addr) >> 0 & 0xff,
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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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.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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};
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static DefineSimpleCacheLookup(ip_map, 0)
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int auth_unix_add_addr(struct in_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 ip, *ipmp;
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if (dom->flavour != RPC_AUTH_UNIX)
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return -EINVAL;
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udom = container_of(dom, struct unix_domain, h);
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strcpy(ip.m_class, "nfsd");
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ip.m_addr = addr;
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ip.m_client = udom;
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ip.m_add_change = udom->addr_changes+1;
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ip.h.flags = 0;
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ip.h.expiry_time = NEVER;
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ipmp = ip_map_lookup(&ip, 1);
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if (ipmp) {
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ip_map_put(&ipmp->h, &ip_map_cache);
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return 0;
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} else
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return -ENOMEM;
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}
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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 != RPC_AUTH_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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struct auth_domain *auth_unix_lookup(struct in_addr addr)
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{
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struct ip_map key, *ipm;
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struct auth_domain *rv;
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strcpy(key.m_class, "nfsd");
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key.m_addr = addr;
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ipm = ip_map_lookup(&key, 0);
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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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cache_get(&rv->h);
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}
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ip_map_put(&ipm->h, &ip_map_cache);
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return rv;
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}
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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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cache_purge(&auth_domain_cache);
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}
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static int
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svcauth_unix_set_client(struct svc_rqst *rqstp)
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{
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struct ip_map key, *ipm;
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rqstp->rq_client = NULL;
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if (rqstp->rq_proc == 0)
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return SVC_OK;
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strcpy(key.m_class, rqstp->rq_server->sv_program->pg_class);
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key.m_addr = rqstp->rq_addr.sin_addr;
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ipm = ip_map_lookup(&key, 0);
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if (ipm == NULL)
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return SVC_DENIED;
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switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
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default:
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BUG();
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case -EAGAIN:
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return SVC_DROP;
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case -ENOENT:
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return SVC_DENIED;
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case 0:
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rqstp->rq_client = &ipm->m_client->h;
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cache_get(&rqstp->rq_client->h);
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ip_map_put(&ipm->h, &ip_map_cache);
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break;
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}
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return SVC_OK;
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}
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static int
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svcauth_null_accept(struct svc_rqst *rqstp, u32 *authp)
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{
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struct kvec *argv = &rqstp->rq_arg.head[0];
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struct kvec *resv = &rqstp->rq_res.head[0];
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struct svc_cred *cred = &rqstp->rq_cred;
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cred->cr_group_info = NULL;
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rqstp->rq_client = NULL;
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if (argv->iov_len < 3*4)
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return SVC_GARBAGE;
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if (svc_getu32(argv) != 0) {
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dprintk("svc: bad null cred\n");
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*authp = rpc_autherr_badcred;
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return SVC_DENIED;
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}
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if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
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dprintk("svc: bad null verf\n");
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*authp = rpc_autherr_badverf;
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return SVC_DENIED;
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}
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/* Signal that mapping to nobody uid/gid is required */
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cred->cr_uid = (uid_t) -1;
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cred->cr_gid = (gid_t) -1;
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cred->cr_group_info = groups_alloc(0);
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if (cred->cr_group_info == NULL)
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return SVC_DROP; /* kmalloc failure - client must retry */
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/* Put NULL verifier */
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svc_putu32(resv, RPC_AUTH_NULL);
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svc_putu32(resv, 0);
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return SVC_OK;
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}
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static int
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svcauth_null_release(struct svc_rqst *rqstp)
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{
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if (rqstp->rq_client)
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auth_domain_put(rqstp->rq_client);
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rqstp->rq_client = NULL;
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if (rqstp->rq_cred.cr_group_info)
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put_group_info(rqstp->rq_cred.cr_group_info);
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rqstp->rq_cred.cr_group_info = NULL;
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return 0; /* don't drop */
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}
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struct auth_ops svcauth_null = {
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.name = "null",
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.owner = THIS_MODULE,
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.flavour = RPC_AUTH_NULL,
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.accept = svcauth_null_accept,
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.release = svcauth_null_release,
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.set_client = svcauth_unix_set_client,
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};
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static int
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svcauth_unix_accept(struct svc_rqst *rqstp, u32 *authp)
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{
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struct kvec *argv = &rqstp->rq_arg.head[0];
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struct kvec *resv = &rqstp->rq_res.head[0];
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struct svc_cred *cred = &rqstp->rq_cred;
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u32 slen, i;
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int len = argv->iov_len;
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cred->cr_group_info = NULL;
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rqstp->rq_client = NULL;
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if ((len -= 3*4) < 0)
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return SVC_GARBAGE;
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svc_getu32(argv); /* length */
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svc_getu32(argv); /* time stamp */
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slen = XDR_QUADLEN(ntohl(svc_getu32(argv))); /* machname length */
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if (slen > 64 || (len -= (slen + 3)*4) < 0)
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goto badcred;
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argv->iov_base = (void*)((u32*)argv->iov_base + slen); /* skip machname */
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argv->iov_len -= slen*4;
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cred->cr_uid = ntohl(svc_getu32(argv)); /* uid */
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cred->cr_gid = ntohl(svc_getu32(argv)); /* gid */
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slen = ntohl(svc_getu32(argv)); /* gids length */
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if (slen > 16 || (len -= (slen + 2)*4) < 0)
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goto badcred;
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cred->cr_group_info = groups_alloc(slen);
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if (cred->cr_group_info == NULL)
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return SVC_DROP;
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for (i = 0; i < slen; i++)
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GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv));
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if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
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*authp = rpc_autherr_badverf;
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return SVC_DENIED;
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}
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/* Put NULL verifier */
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svc_putu32(resv, RPC_AUTH_NULL);
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svc_putu32(resv, 0);
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return SVC_OK;
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badcred:
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*authp = rpc_autherr_badcred;
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return SVC_DENIED;
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}
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static int
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svcauth_unix_release(struct svc_rqst *rqstp)
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{
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/* Verifier (such as it is) is already in place.
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*/
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if (rqstp->rq_client)
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auth_domain_put(rqstp->rq_client);
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rqstp->rq_client = NULL;
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if (rqstp->rq_cred.cr_group_info)
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put_group_info(rqstp->rq_cred.cr_group_info);
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rqstp->rq_cred.cr_group_info = NULL;
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return 0;
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}
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struct auth_ops svcauth_unix = {
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.name = "unix",
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.owner = THIS_MODULE,
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.flavour = RPC_AUTH_UNIX,
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.accept = svcauth_unix_accept,
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.release = svcauth_unix_release,
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.domain_release = svcauth_unix_domain_release,
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.set_client = svcauth_unix_set_client,
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};
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