#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/sunrpc/gss_api.h> #include <linux/err.h> #include <linux/seq_file.h> #include <linux/hash.h> #include <linux/string.h> #include <net/sock.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. */ struct unix_domain { struct auth_domain h; int addr_changes; /* other stuff later */ }; extern struct auth_ops svcauth_unix; struct auth_domain *unix_domain_find(char *name) { struct auth_domain *rv; struct unix_domain *new = NULL; rv = auth_domain_lookup(name, NULL); while(1) { if (rv) { if (new && rv != &new->h) auth_domain_put(&new->h); if (rv->flavour != &svcauth_unix) { auth_domain_put(rv); return NULL; } return rv; } new = kmalloc(sizeof(*new), GFP_KERNEL); if (new == NULL) return NULL; kref_init(&new->h.ref); new->h.name = kstrdup(name, GFP_KERNEL); if (new->h.name == NULL) { kfree(new); return NULL; } new->h.flavour = &svcauth_unix; new->addr_changes = 0; rv = auth_domain_lookup(name, &new->h); } } EXPORT_SYMBOL(unix_domain_find); 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 kref *kref) { struct cache_head *item = container_of(kref, struct cache_head, ref); struct ip_map *im = container_of(item, struct ip_map,h); if (test_bit(CACHE_VALID, &item->flags) && !test_bit(CACHE_NEGATIVE, &item->flags)) auth_domain_put(&im->m_client->h); kfree(im); } #if IP_HASHBITS == 8 /* hash_long on a 64 bit machine is currently REALLY BAD for * IP addresses in reverse-endian (i.e. on a little-endian machine). * So use a trivial but reliable hash instead */ static inline int hash_ip(__be32 ip) { int hash = (__force u32)ip ^ ((__force u32)ip>>16); return (hash ^ (hash>>8)) & 0xff; } #endif static int ip_map_match(struct cache_head *corig, struct cache_head *cnew) { struct ip_map *orig = container_of(corig, struct ip_map, h); struct ip_map *new = container_of(cnew, struct ip_map, h); return strcmp(orig->m_class, new->m_class) == 0 && orig->m_addr.s_addr == new->m_addr.s_addr; } static void ip_map_init(struct cache_head *cnew, struct cache_head *citem) { struct ip_map *new = container_of(cnew, struct ip_map, h); struct ip_map *item = container_of(citem, struct ip_map, h); strcpy(new->m_class, item->m_class); new->m_addr.s_addr = item->m_addr.s_addr; } static void update(struct cache_head *cnew, struct cache_head *citem) { struct ip_map *new = container_of(cnew, struct ip_map, h); struct ip_map *item = container_of(citem, struct ip_map, h); kref_get(&item->m_client->h.ref); new->m_client = item->m_client; new->m_add_change = item->m_add_change; } static struct cache_head *ip_map_alloc(void) { struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL); if (i) return &i->h; else return NULL; } 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); __be32 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(char *class, struct in_addr addr); static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry); 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; char class[8]; struct in_addr addr; int err; struct ip_map *ipmp; struct auth_domain *dom; time_t expiry; if (mesg[mlen-1] != '\n') return -EINVAL; mesg[mlen-1] = 0; /* class */ len = qword_get(&mesg, class, sizeof(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; addr.s_addr = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4); ipmp = ip_map_lookup(class,addr); if (ipmp) { err = ip_map_update(ipmp, container_of(dom, struct unix_domain, h), expiry); } else err = -ENOMEM; if (dom) auth_domain_put(dom); cache_flush(); return err; } 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, ntohl(addr.s_addr) >> 24 & 0xff, ntohl(addr.s_addr) >> 16 & 0xff, ntohl(addr.s_addr) >> 8 & 0xff, ntohl(addr.s_addr) >> 0 & 0xff, dom ); return 0; } struct cache_detail ip_map_cache = { .owner = THIS_MODULE, .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, .match = ip_map_match, .init = ip_map_init, .update = update, .alloc = ip_map_alloc, }; static struct ip_map *ip_map_lookup(char *class, struct in_addr addr) { struct ip_map ip; struct cache_head *ch; strcpy(ip.m_class, class); ip.m_addr = addr; ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h, hash_str(class, IP_HASHBITS) ^ hash_ip(addr.s_addr)); if (ch) return container_of(ch, struct ip_map, h); else return NULL; } static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry) { struct ip_map ip; struct cache_head *ch; ip.m_client = udom; ip.h.flags = 0; if (!udom) set_bit(CACHE_NEGATIVE, &ip.h.flags); else { ip.m_add_change = udom->addr_changes; /* if this is from the legacy set_client system call, * we need m_add_change to be one higher */ if (expiry == NEVER) ip.m_add_change++; } ip.h.expiry_time = expiry; ch = sunrpc_cache_update(&ip_map_cache, &ip.h, &ipm->h, hash_str(ipm->m_class, IP_HASHBITS) ^ hash_ip(ipm->m_addr.s_addr)); if (!ch) return -ENOMEM; cache_put(ch, &ip_map_cache); return 0; } int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom) { struct unix_domain *udom; struct ip_map *ipmp; if (dom->flavour != &svcauth_unix) return -EINVAL; udom = container_of(dom, struct unix_domain, h); ipmp = ip_map_lookup("nfsd", addr); if (ipmp) return ip_map_update(ipmp, udom, NEVER); else return -ENOMEM; } EXPORT_SYMBOL(auth_unix_add_addr); int auth_unix_forget_old(struct auth_domain *dom) { struct unix_domain *udom; if (dom->flavour != &svcauth_unix) return -EINVAL; udom = container_of(dom, struct unix_domain, h); udom->addr_changes++; return 0; } EXPORT_SYMBOL(auth_unix_forget_old); struct auth_domain *auth_unix_lookup(struct in_addr addr) { struct ip_map *ipm; struct auth_domain *rv; ipm = ip_map_lookup("nfsd", addr); 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; kref_get(&rv->ref); } cache_put(&ipm->h, &ip_map_cache); return rv; } EXPORT_SYMBOL(auth_unix_lookup); void svcauth_unix_purge(void) { cache_purge(&ip_map_cache); } EXPORT_SYMBOL(svcauth_unix_purge); static inline struct ip_map * ip_map_cached_get(struct svc_rqst *rqstp) { struct ip_map *ipm = NULL; struct svc_xprt *xprt = rqstp->rq_xprt; if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { spin_lock(&xprt->xpt_lock); ipm = xprt->xpt_auth_cache; if (ipm != NULL) { if (!cache_valid(&ipm->h)) { /* * The entry has been invalidated since it was * remembered, e.g. by a second mount from the * same IP address. */ xprt->xpt_auth_cache = NULL; spin_unlock(&xprt->xpt_lock); cache_put(&ipm->h, &ip_map_cache); return NULL; } cache_get(&ipm->h); } spin_unlock(&xprt->xpt_lock); } return ipm; } static inline void ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm) { struct svc_xprt *xprt = rqstp->rq_xprt; if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { spin_lock(&xprt->xpt_lock); if (xprt->xpt_auth_cache == NULL) { /* newly cached, keep the reference */ xprt->xpt_auth_cache = ipm; ipm = NULL; } spin_unlock(&xprt->xpt_lock); } if (ipm) cache_put(&ipm->h, &ip_map_cache); } void svcauth_unix_info_release(void *info) { struct ip_map *ipm = info; cache_put(&ipm->h, &ip_map_cache); } /**************************************************************************** * auth.unix.gid cache * simple cache to map a UID to a list of GIDs * because AUTH_UNIX aka AUTH_SYS has a max of 16 */ #define GID_HASHBITS 8 #define GID_HASHMAX (1<<GID_HASHBITS) #define GID_HASHMASK (GID_HASHMAX - 1) struct unix_gid { struct cache_head h; 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 = svc_addr_in(rqstp); struct ip_map *ipm; 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, sin->sin_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, };