diff options
Diffstat (limited to 'net/sunrpc/svcauth_unix.c')
| -rw-r--r-- | net/sunrpc/svcauth_unix.c | 502 |
1 files changed, 502 insertions, 0 deletions
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c new file mode 100644 index 000000000000..2b99b4028d31 --- /dev/null +++ b/net/sunrpc/svcauth_unix.c @@ -0,0 +1,502 @@ +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/module.h> +#include <linux/sunrpc/types.h> +#include <linux/sunrpc/xdr.h> +#include <linux/sunrpc/svcsock.h> +#include <linux/sunrpc/svcauth.h> +#include <linux/err.h> +#include <linux/seq_file.h> +#include <linux/hash.h> + +#define RPCDBG_FACILITY RPCDBG_AUTH + + +/* + * AUTHUNIX and AUTHNULL credentials are both handled here. + * AUTHNULL is treated just like AUTHUNIX except that the uid/gid + * are always nobody (-2). i.e. we do the same IP address checks for + * AUTHNULL as for AUTHUNIX, and that is done here. + */ + + +static char *strdup(char *s) +{ + char *rv = kmalloc(strlen(s)+1, GFP_KERNEL); + if (rv) + strcpy(rv, s); + return rv; +} + +struct unix_domain { + struct auth_domain h; + int addr_changes; + /* other stuff later */ +}; + +struct auth_domain *unix_domain_find(char *name) +{ + struct auth_domain *rv, ud; + struct unix_domain *new; + + ud.name = name; + + rv = auth_domain_lookup(&ud, 0); + + foundit: + if (rv && rv->flavour != RPC_AUTH_UNIX) { + auth_domain_put(rv); + return NULL; + } + if (rv) + return rv; + + new = kmalloc(sizeof(*new), GFP_KERNEL); + if (new == NULL) + return NULL; + cache_init(&new->h.h); + new->h.name = strdup(name); + new->h.flavour = RPC_AUTH_UNIX; + new->addr_changes = 0; + new->h.h.expiry_time = NEVER; + + rv = auth_domain_lookup(&new->h, 2); + if (rv == &new->h) { + if (atomic_dec_and_test(&new->h.h.refcnt)) BUG(); + } else { + auth_domain_put(&new->h); + goto foundit; + } + + return rv; +} + +static void svcauth_unix_domain_release(struct auth_domain *dom) +{ + struct unix_domain *ud = container_of(dom, struct unix_domain, h); + + kfree(dom->name); + kfree(ud); +} + + +/************************************************** + * cache for IP address to unix_domain + * as needed by AUTH_UNIX + */ +#define IP_HASHBITS 8 +#define IP_HASHMAX (1<<IP_HASHBITS) +#define IP_HASHMASK (IP_HASHMAX-1) + +struct ip_map { + struct cache_head h; + char m_class[8]; /* e.g. "nfsd" */ + struct in_addr m_addr; + struct unix_domain *m_client; + int m_add_change; +}; +static struct cache_head *ip_table[IP_HASHMAX]; + +static void ip_map_put(struct cache_head *item, struct cache_detail *cd) +{ + struct ip_map *im = container_of(item, struct ip_map,h); + if (cache_put(item, cd)) { + if (test_bit(CACHE_VALID, &item->flags) && + !test_bit(CACHE_NEGATIVE, &item->flags)) + auth_domain_put(&im->m_client->h); + kfree(im); + } +} + +static inline int ip_map_hash(struct ip_map *item) +{ + return hash_str(item->m_class, IP_HASHBITS) ^ + hash_long((unsigned long)item->m_addr.s_addr, IP_HASHBITS); +} +static inline int ip_map_match(struct ip_map *item, struct ip_map *tmp) +{ + return strcmp(tmp->m_class, item->m_class) == 0 + && tmp->m_addr.s_addr == item->m_addr.s_addr; +} +static inline void ip_map_init(struct ip_map *new, struct ip_map *item) +{ + strcpy(new->m_class, item->m_class); + new->m_addr.s_addr = item->m_addr.s_addr; +} +static inline void ip_map_update(struct ip_map *new, struct ip_map *item) +{ + cache_get(&item->m_client->h.h); + new->m_client = item->m_client; + new->m_add_change = item->m_add_change; +} + +static void ip_map_request(struct cache_detail *cd, + struct cache_head *h, + char **bpp, int *blen) +{ + char text_addr[20]; + struct ip_map *im = container_of(h, struct ip_map, h); + __u32 addr = im->m_addr.s_addr; + + snprintf(text_addr, 20, "%u.%u.%u.%u", + ntohl(addr) >> 24 & 0xff, + ntohl(addr) >> 16 & 0xff, + ntohl(addr) >> 8 & 0xff, + ntohl(addr) >> 0 & 0xff); + + qword_add(bpp, blen, im->m_class); + qword_add(bpp, blen, text_addr); + (*bpp)[-1] = '\n'; +} + +static struct ip_map *ip_map_lookup(struct ip_map *, int); + +static int ip_map_parse(struct cache_detail *cd, + char *mesg, int mlen) +{ + /* class ipaddress [domainname] */ + /* should be safe just to use the start of the input buffer + * for scratch: */ + char *buf = mesg; + int len; + int b1,b2,b3,b4; + char c; + struct ip_map ipm, *ipmp; + struct auth_domain *dom; + time_t expiry; + + if (mesg[mlen-1] != '\n') + return -EINVAL; + mesg[mlen-1] = 0; + + /* class */ + len = qword_get(&mesg, ipm.m_class, sizeof(ipm.m_class)); + if (len <= 0) return -EINVAL; + + /* ip address */ + len = qword_get(&mesg, buf, mlen); + if (len <= 0) return -EINVAL; + + if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4) + return -EINVAL; + + expiry = get_expiry(&mesg); + if (expiry ==0) + return -EINVAL; + + /* domainname, or empty for NEGATIVE */ + len = qword_get(&mesg, buf, mlen); + if (len < 0) return -EINVAL; + + if (len) { + dom = unix_domain_find(buf); + if (dom == NULL) + return -ENOENT; + } else + dom = NULL; + + ipm.m_addr.s_addr = + htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4); + ipm.h.flags = 0; + if (dom) { + ipm.m_client = container_of(dom, struct unix_domain, h); + ipm.m_add_change = ipm.m_client->addr_changes; + } else + set_bit(CACHE_NEGATIVE, &ipm.h.flags); + ipm.h.expiry_time = expiry; + + ipmp = ip_map_lookup(&ipm, 1); + if (ipmp) + ip_map_put(&ipmp->h, &ip_map_cache); + if (dom) + auth_domain_put(dom); + if (!ipmp) + return -ENOMEM; + cache_flush(); + return 0; +} + +static int ip_map_show(struct seq_file *m, + struct cache_detail *cd, + struct cache_head *h) +{ + struct ip_map *im; + struct in_addr addr; + char *dom = "-no-domain-"; + + if (h == NULL) { + seq_puts(m, "#class IP domain\n"); + return 0; + } + im = container_of(h, struct ip_map, h); + /* class addr domain */ + addr = im->m_addr; + + if (test_bit(CACHE_VALID, &h->flags) && + !test_bit(CACHE_NEGATIVE, &h->flags)) + dom = im->m_client->h.name; + + seq_printf(m, "%s %d.%d.%d.%d %s\n", + im->m_class, + htonl(addr.s_addr) >> 24 & 0xff, + htonl(addr.s_addr) >> 16 & 0xff, + htonl(addr.s_addr) >> 8 & 0xff, + htonl(addr.s_addr) >> 0 & 0xff, + dom + ); + return 0; +} + + +struct cache_detail ip_map_cache = { + .hash_size = IP_HASHMAX, + .hash_table = ip_table, + .name = "auth.unix.ip", + .cache_put = ip_map_put, + .cache_request = ip_map_request, + .cache_parse = ip_map_parse, + .cache_show = ip_map_show, +}; + +static DefineSimpleCacheLookup(ip_map, 0) + + +int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom) +{ + struct unix_domain *udom; + struct ip_map ip, *ipmp; + + if (dom->flavour != RPC_AUTH_UNIX) + return -EINVAL; + udom = container_of(dom, struct unix_domain, h); + strcpy(ip.m_class, "nfsd"); + ip.m_addr = addr; + ip.m_client = udom; + ip.m_add_change = udom->addr_changes+1; + ip.h.flags = 0; + ip.h.expiry_time = NEVER; + + ipmp = ip_map_lookup(&ip, 1); + + if (ipmp) { + ip_map_put(&ipmp->h, &ip_map_cache); + return 0; + } else + return -ENOMEM; +} + +int auth_unix_forget_old(struct auth_domain *dom) +{ + struct unix_domain *udom; + + if (dom->flavour != RPC_AUTH_UNIX) + return -EINVAL; + udom = container_of(dom, struct unix_domain, h); + udom->addr_changes++; + return 0; +} + +struct auth_domain *auth_unix_lookup(struct in_addr addr) +{ + struct ip_map key, *ipm; + struct auth_domain *rv; + + strcpy(key.m_class, "nfsd"); + key.m_addr = addr; + + ipm = ip_map_lookup(&key, 0); + + if (!ipm) + return NULL; + if (cache_check(&ip_map_cache, &ipm->h, NULL)) + return NULL; + + if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) { + if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0) + auth_domain_put(&ipm->m_client->h); + rv = NULL; + } else { + rv = &ipm->m_client->h; + cache_get(&rv->h); + } + ip_map_put(&ipm->h, &ip_map_cache); + return rv; +} + +void svcauth_unix_purge(void) +{ + cache_purge(&ip_map_cache); + cache_purge(&auth_domain_cache); +} + +static int +svcauth_unix_set_client(struct svc_rqst *rqstp) +{ + struct ip_map key, *ipm; + + rqstp->rq_client = NULL; + if (rqstp->rq_proc == 0) + return SVC_OK; + + strcpy(key.m_class, rqstp->rq_server->sv_program->pg_class); + key.m_addr = rqstp->rq_addr.sin_addr; + + ipm = ip_map_lookup(&key, 0); + + if (ipm == NULL) + return SVC_DENIED; + + switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) { + default: + BUG(); + case -EAGAIN: + return SVC_DROP; + case -ENOENT: + return SVC_DENIED; + case 0: + rqstp->rq_client = &ipm->m_client->h; + cache_get(&rqstp->rq_client->h); + ip_map_put(&ipm->h, &ip_map_cache); + break; + } + return SVC_OK; +} + +static int +svcauth_null_accept(struct svc_rqst *rqstp, u32 *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) != 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_putu32(resv, RPC_AUTH_NULL); + svc_putu32(resv, 0); + + 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, u32 *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(ntohl(svc_getu32(argv))); /* machname length */ + if (slen > 64 || (len -= (slen + 3)*4) < 0) + goto badcred; + argv->iov_base = (void*)((u32*)argv->iov_base + slen); /* skip machname */ + argv->iov_len -= slen*4; + + cred->cr_uid = ntohl(svc_getu32(argv)); /* uid */ + cred->cr_gid = ntohl(svc_getu32(argv)); /* gid */ + slen = ntohl(svc_getu32(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_DROP; + for (i = 0; i < slen; i++) + GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv)); + + if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) { + *authp = rpc_autherr_badverf; + return SVC_DENIED; + } + + /* Put NULL verifier */ + svc_putu32(resv, RPC_AUTH_NULL); + svc_putu32(resv, 0); + + 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, +}; + |