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kernel-49/net/sunrpc/auth_gss/svcauth_gss.c
Greg Kroah-Hartman fc73f0764a Merge 4.9.283 into android-4.9-q
Changes in 4.9.283
	ext4: fix race writing to an inline_data file while its xattrs are changing
	mtd: nand: atmel_nand: remove build warning in atmel_nand_remove()
	xtensa: fix kconfig unmet dependency warning for HAVE_FUTEX_CMPXCHG
	qed: Fix the VF msix vectors flow
	qede: Fix memset corruption
	perf/x86/amd/ibs: Work around erratum #1197
	cryptoloop: add a deprecation warning
	ARM: 8918/2: only build return_address() if needed
	ALSA: pcm: fix divide error in snd_pcm_lib_ioctl
	ath: Use safer key clearing with key cache entries
	ath9k: Clear key cache explicitly on disabling hardware
	ath: Export ath_hw_keysetmac()
	ath: Modify ath_key_delete() to not need full key entry
	ath9k: Postpone key cache entry deletion for TXQ frames reference it
	media: stkwebcam: fix memory leak in stk_camera_probe
	igmp: Add ip_mc_list lock in ip_check_mc_rcu
	usb: phy: isp1301: Fix build warning when CONFIG_OF is disabled
	USB: serial: mos7720: improve OOM-handling in read_mos_reg()
	net/sched: cls_flower: Use mask for addr_type
	PM / wakeirq: Enable dedicated wakeirq for suspend
	tc358743: fix register i2c_rd/wr function fix
	nvme-pci: Fix an error handling path in 'nvme_probe()'
	gfs2: Don't clear SGID when inheriting ACLs
	ipv4/icmp: l3mdev: Perform icmp error route lookup on source device routing table (v2)
	s390/disassembler: correct disassembly lines alignment
	mm/kmemleak.c: make cond_resched() rate-limiting more efficient
	crypto: talitos - reduce max key size for SEC1
	powerpc/module64: Fix comment in R_PPC64_ENTRY handling
	powerpc/boot: Delete unneeded .globl _zimage_start
	net: ll_temac: Remove left-over debug message
	mm/page_alloc: speed up the iteration of max_order
	Revert "btrfs: compression: don't try to compress if we don't have enough pages"
	x86/reboot: Limit Dell Optiplex 990 quirk to early BIOS versions
	PCI: Call Max Payload Size-related fixup quirks early
	regmap: fix the offset of register error log
	crypto: mxs-dcp - Check for DMA mapping errors
	power: supply: axp288_fuel_gauge: Report register-address on readb / writeb errors
	crypto: omap-sham - clear dma flags only after omap_sham_update_dma_stop()
	udf: Check LVID earlier
	power: supply: max17042_battery: fix typo in MAx17042_TOFF
	libata: fix ata_host_start()
	crypto: qat - do not ignore errors from enable_vf2pf_comms()
	crypto: qat - handle both source of interrupt in VF ISR
	crypto: qat - fix reuse of completion variable
	crypto: qat - fix naming for init/shutdown VF to PF notifications
	crypto: qat - do not export adf_iov_putmsg()
	udf_get_extendedattr() had no boundary checks.
	m68k: emu: Fix invalid free in nfeth_cleanup()
	spi: spi-pic32: Fix issue with uninitialized dma_slave_config
	crypto: qat - use proper type for vf_mask
	certs: Trigger creation of RSA module signing key if it's not an RSA key
	media: dvb-usb: fix uninit-value in dvb_usb_adapter_dvb_init
	media: dvb-usb: fix uninit-value in vp702x_read_mac_addr
	media: go7007: remove redundant initialization
	Bluetooth: sco: prevent information leak in sco_conn_defer_accept()
	tcp: seq_file: Avoid skipping sk during tcp_seek_last_pos
	net: cipso: fix warnings in netlbl_cipsov4_add_std
	i2c: highlander: add IRQ check
	PCI: PM: Enable PME if it can be signaled from D3cold
	soc: qcom: smsm: Fix missed interrupts if state changes while masked
	Bluetooth: increase BTNAMSIZ to 21 chars to fix potential buffer overflow
	arm64: dts: exynos: correct GIC CPU interfaces address range on Exynos7
	Bluetooth: fix repeated calls to sco_sock_kill
	drm/msm/dsi: Fix some reference counted resource leaks
	usb: gadget: udc: at91: add IRQ check
	usb: phy: fsl-usb: add IRQ check
	usb: phy: twl6030: add IRQ checks
	Bluetooth: Move shutdown callback before flushing tx and rx queue
	usb: host: ohci-tmio: add IRQ check
	usb: phy: tahvo: add IRQ check
	usb: gadget: mv_u3d: request_irq() after initializing UDC
	Bluetooth: add timeout sanity check to hci_inquiry
	i2c: iop3xx: fix deferred probing
	i2c: s3c2410: fix IRQ check
	mmc: dw_mmc: Fix issue with uninitialized dma_slave_config
	mmc: moxart: Fix issue with uninitialized dma_slave_config
	CIFS: Fix a potencially linear read overflow
	i2c: mt65xx: fix IRQ check
	usb: ehci-orion: Handle errors of clk_prepare_enable() in probe
	ath6kl: wmi: fix an error code in ath6kl_wmi_sync_point()
	bcma: Fix memory leak for internally-handled cores
	ipv4: make exception cache less predictible
	tty: Fix data race between tiocsti() and flush_to_ldisc()
	KVM: x86: Update vCPU's hv_clock before back to guest when tsc_offset is adjusted
	IMA: remove -Wmissing-prototypes warning
	clk: kirkwood: Fix a clocking boot regression
	fbmem: don't allow too huge resolutions
	rtc: tps65910: Correct driver module alias
	PCI/MSI: Skip masking MSI-X on Xen PV
	powerpc/perf/hv-gpci: Fix counter value parsing
	xen: fix setting of max_pfn in shared_info
	crypto: public_key: fix overflow during implicit conversion
	power: supply: max17042: handle fails of reading status register
	VMCI: fix NULL pointer dereference when unmapping queue pair
	media: uvc: don't do DMA on stack
	media: rc-loopback: return number of emitters rather than error
	libata: add ATA_HORKAGE_NO_NCQ_TRIM for Samsung 860 and 870 SSDs
	ARM: 9105/1: atags_to_fdt: don't warn about stack size
	PCI: Restrict ASMedia ASM1062 SATA Max Payload Size Supported
	PCI: Return ~0 data on pciconfig_read() CAP_SYS_ADMIN failure
	vfio: Use config not menuconfig for VFIO_NOIOMMU
	openrisc: don't printk() unconditionally
	pinctrl: single: Fix error return code in pcs_parse_bits_in_pinctrl_entry()
	MIPS: Malta: fix alignment of the devicetree buffer
	crypto: mxs-dcp - Use sg_mapping_iter to copy data
	PCI: Use pci_update_current_state() in pci_enable_device_flags()
	iio: dac: ad5624r: Fix incorrect handling of an optional regulator.
	video: fbdev: kyro: fix a DoS bug by restricting user input
	netlink: Deal with ESRCH error in nlmsg_notify()
	Smack: Fix wrong semantics in smk_access_entry()
	usb: host: fotg210: fix the endpoint's transactional opportunities calculation
	usb: host: fotg210: fix the actual_length of an iso packet
	usb: gadget: u_ether: fix a potential null pointer dereference
	usb: gadget: composite: Allow bMaxPower=0 if self-powered
	staging: board: Fix uninitialized spinlock when attaching genpd
	tty: serial: jsm: hold port lock when reporting modem line changes
	bpf/tests: Fix copy-and-paste error in double word test
	bpf/tests: Do not PASS tests without actually testing the result
	video: fbdev: asiliantfb: Error out if 'pixclock' equals zero
	video: fbdev: kyro: Error out if 'pixclock' equals zero
	video: fbdev: riva: Error out if 'pixclock' equals zero
	ipv4: ip_output.c: Fix out-of-bounds warning in ip_copy_addrs()
	flow_dissector: Fix out-of-bounds warnings
	s390/jump_label: print real address in a case of a jump label bug
	serial: 8250: Define RX trigger levels for OxSemi 950 devices
	xtensa: ISS: don't panic in rs_init
	hvsi: don't panic on tty_register_driver failure
	serial: 8250_pci: make setup_port() parameters explicitly unsigned
	staging: ks7010: Fix the initialization of the 'sleep_status' structure
	ata: sata_dwc_460ex: No need to call phy_exit() befre phy_init()
	Bluetooth: skip invalid hci_sync_conn_complete_evt
	ASoC: Intel: bytcr_rt5640: Move "Platform Clock" routes to the maps for the matching in-/output
	net: ethernet: stmmac: Do not use unreachable() in ipq806x_gmac_probe()
	Bluetooth: avoid circular locks in sco_sock_connect
	gpu: drm: amd: amdgpu: amdgpu_i2c: fix possible uninitialized-variable access in amdgpu_i2c_router_select_ddc_port()
	ARM: tegra: tamonten: Fix UART pad setting
	rpc: fix gss_svc_init cleanup on failure
	gfs2: Don't call dlm after protocol is unmounted
	mmc: rtsx_pci: Fix long reads when clock is prescaled
	cifs: fix wrong release in sess_alloc_buffer() failed path
	Revert "USB: xhci: fix U1/U2 handling for hardware with XHCI_INTEL_HOST quirk set"
	usbip: give back URBs for unsent unlink requests during cleanup
	parport: remove non-zero check on count
	ath9k: fix OOB read ar9300_eeprom_restore_internal
	ath9k: fix sleeping in atomic context
	net: fix NULL pointer reference in cipso_v4_doi_free
	net: w5100: check return value after calling platform_get_resource()
	parisc: fix crash with signals and alloca
	scsi: BusLogic: Fix missing pr_cont() use
	mm/hugetlb: initialize hugetlb_usage in mm_init
	memcg: enable accounting for pids in nested pid namespaces
	platform/chrome: cros_ec_proto: Send command again when timeout occurs
	xen: reset legacy rtc flag for PV domU
	bnx2x: Fix enabling network interfaces without VFs
	net-caif: avoid user-triggerable WARN_ON(1)
	ptp: dp83640: don't define PAGE0
	dccp: don't duplicate ccid when cloning dccp sock
	net/l2tp: Fix reference count leak in l2tp_udp_recv_core
	r6040: Restore MDIO clock frequency after MAC reset
	tipc: increase timeout in tipc_sk_enqueue()
	events: Reuse value read using READ_ONCE instead of re-reading it
	net/af_unix: fix a data-race in unix_dgram_poll
	tcp: fix tp->undo_retrans accounting in tcp_sacktag_one()
	x86/mm: Fix kern_addr_valid() to cope with existing but not present entries
	dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation
	mfd: Don't use irq_create_mapping() to resolve a mapping
	net: usb: cdc_mbim: avoid altsetting toggling for Telit LN920
	ethtool: Fix an error code in cxgb2.c
	PCI: Sync __pci_register_driver() stub for CONFIG_PCI=n
	mtd: rawnand: cafe: Fix a resource leak in the error handling path of 'cafe_nand_probe()'
	ARC: export clear_user_page() for modules
	net: dsa: b53: Fix calculating number of switch ports
	qlcnic: Remove redundant unlock in qlcnic_pinit_from_rom
	net: renesas: sh_eth: Fix freeing wrong tx descriptor
	s390/bpf: Fix 64-bit subtraction of the -0x80000000 constant
	Linux 4.9.283

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I9e2017cce36805d71566ea1f265974a43bae33d1
2021-09-23 10:21:59 +03:00

1881 lines
46 KiB
C

/*
* Neil Brown <neilb@cse.unsw.edu.au>
* J. Bruce Fields <bfields@umich.edu>
* Andy Adamson <andros@umich.edu>
* Dug Song <dugsong@monkey.org>
*
* RPCSEC_GSS server authentication.
* This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
* (gssapi)
*
* The RPCSEC_GSS involves three stages:
* 1/ context creation
* 2/ data exchange
* 3/ context destruction
*
* Context creation is handled largely by upcalls to user-space.
* In particular, GSS_Accept_sec_context is handled by an upcall
* Data exchange is handled entirely within the kernel
* In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
* Context destruction is handled in-kernel
* GSS_Delete_sec_context is in-kernel
*
* Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
* The context handle and gss_token are used as a key into the rpcsec_init cache.
* The content of this cache includes some of the outputs of GSS_Accept_sec_context,
* being major_status, minor_status, context_handle, reply_token.
* These are sent back to the client.
* Sequence window management is handled by the kernel. The window size if currently
* a compile time constant.
*
* When user-space is happy that a context is established, it places an entry
* in the rpcsec_context cache. The key for this cache is the context_handle.
* The content includes:
* uid/gidlist - for determining access rights
* mechanism type
* mechanism specific information, such as a key
*
*/
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/user_namespace.h>
#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/cache.h>
#include "gss_rpc_upcall.h"
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
* into replies.
*
* Key is context handle (\x if empty) and gss_token.
* Content is major_status minor_status (integers) context_handle, reply_token.
*
*/
static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
{
return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
}
#define RSI_HASHBITS 6
#define RSI_HASHMAX (1<<RSI_HASHBITS)
struct rsi {
struct cache_head h;
struct xdr_netobj in_handle, in_token;
struct xdr_netobj out_handle, out_token;
int major_status, minor_status;
};
static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
static void rsi_free(struct rsi *rsii)
{
kfree(rsii->in_handle.data);
kfree(rsii->in_token.data);
kfree(rsii->out_handle.data);
kfree(rsii->out_token.data);
}
static void rsi_put(struct kref *ref)
{
struct rsi *rsii = container_of(ref, struct rsi, h.ref);
rsi_free(rsii);
kfree(rsii);
}
static inline int rsi_hash(struct rsi *item)
{
return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
}
static int rsi_match(struct cache_head *a, struct cache_head *b)
{
struct rsi *item = container_of(a, struct rsi, h);
struct rsi *tmp = container_of(b, struct rsi, h);
return netobj_equal(&item->in_handle, &tmp->in_handle) &&
netobj_equal(&item->in_token, &tmp->in_token);
}
static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
{
dst->len = len;
dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
if (len && !dst->data)
return -ENOMEM;
return 0;
}
static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
{
return dup_to_netobj(dst, src->data, src->len);
}
static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
{
struct rsi *new = container_of(cnew, struct rsi, h);
struct rsi *item = container_of(citem, struct rsi, h);
new->out_handle.data = NULL;
new->out_handle.len = 0;
new->out_token.data = NULL;
new->out_token.len = 0;
new->in_handle.len = item->in_handle.len;
item->in_handle.len = 0;
new->in_token.len = item->in_token.len;
item->in_token.len = 0;
new->in_handle.data = item->in_handle.data;
item->in_handle.data = NULL;
new->in_token.data = item->in_token.data;
item->in_token.data = NULL;
}
static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
{
struct rsi *new = container_of(cnew, struct rsi, h);
struct rsi *item = container_of(citem, struct rsi, h);
BUG_ON(new->out_handle.data || new->out_token.data);
new->out_handle.len = item->out_handle.len;
item->out_handle.len = 0;
new->out_token.len = item->out_token.len;
item->out_token.len = 0;
new->out_handle.data = item->out_handle.data;
item->out_handle.data = NULL;
new->out_token.data = item->out_token.data;
item->out_token.data = NULL;
new->major_status = item->major_status;
new->minor_status = item->minor_status;
}
static struct cache_head *rsi_alloc(void)
{
struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
if (rsii)
return &rsii->h;
else
return NULL;
}
static void rsi_request(struct cache_detail *cd,
struct cache_head *h,
char **bpp, int *blen)
{
struct rsi *rsii = container_of(h, struct rsi, h);
qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
(*bpp)[-1] = '\n';
}
static int rsi_parse(struct cache_detail *cd,
char *mesg, int mlen)
{
/* context token expiry major minor context token */
char *buf = mesg;
char *ep;
int len;
struct rsi rsii, *rsip = NULL;
time_t expiry;
int status = -EINVAL;
memset(&rsii, 0, sizeof(rsii));
/* handle */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.in_handle, buf, len))
goto out;
/* token */
len = qword_get(&mesg, buf, mlen);
status = -EINVAL;
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.in_token, buf, len))
goto out;
rsip = rsi_lookup(cd, &rsii);
if (!rsip)
goto out;
rsii.h.flags = 0;
/* expiry */
expiry = get_expiry(&mesg);
status = -EINVAL;
if (expiry == 0)
goto out;
/* major/minor */
len = qword_get(&mesg, buf, mlen);
if (len <= 0)
goto out;
rsii.major_status = simple_strtoul(buf, &ep, 10);
if (*ep)
goto out;
len = qword_get(&mesg, buf, mlen);
if (len <= 0)
goto out;
rsii.minor_status = simple_strtoul(buf, &ep, 10);
if (*ep)
goto out;
/* out_handle */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.out_handle, buf, len))
goto out;
/* out_token */
len = qword_get(&mesg, buf, mlen);
status = -EINVAL;
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.out_token, buf, len))
goto out;
rsii.h.expiry_time = expiry;
rsip = rsi_update(cd, &rsii, rsip);
status = 0;
out:
rsi_free(&rsii);
if (rsip)
cache_put(&rsip->h, cd);
else
status = -ENOMEM;
return status;
}
static struct cache_detail rsi_cache_template = {
.owner = THIS_MODULE,
.hash_size = RSI_HASHMAX,
.name = "auth.rpcsec.init",
.cache_put = rsi_put,
.cache_request = rsi_request,
.cache_parse = rsi_parse,
.match = rsi_match,
.init = rsi_init,
.update = update_rsi,
.alloc = rsi_alloc,
};
static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
{
struct cache_head *ch;
int hash = rsi_hash(item);
ch = sunrpc_cache_lookup(cd, &item->h, hash);
if (ch)
return container_of(ch, struct rsi, h);
else
return NULL;
}
static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
{
struct cache_head *ch;
int hash = rsi_hash(new);
ch = sunrpc_cache_update(cd, &new->h,
&old->h, hash);
if (ch)
return container_of(ch, struct rsi, h);
else
return NULL;
}
/*
* The rpcsec_context cache is used to store a context that is
* used in data exchange.
* The key is a context handle. The content is:
* uid, gidlist, mechanism, service-set, mech-specific-data
*/
#define RSC_HASHBITS 10
#define RSC_HASHMAX (1<<RSC_HASHBITS)
#define GSS_SEQ_WIN 128
struct gss_svc_seq_data {
/* highest seq number seen so far: */
int sd_max;
/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
* sd_win is nonzero iff sequence number i has been seen already: */
unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
spinlock_t sd_lock;
};
struct rsc {
struct cache_head h;
struct xdr_netobj handle;
struct svc_cred cred;
struct gss_svc_seq_data seqdata;
struct gss_ctx *mechctx;
};
static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
static void rsc_free(struct rsc *rsci)
{
kfree(rsci->handle.data);
if (rsci->mechctx)
gss_delete_sec_context(&rsci->mechctx);
free_svc_cred(&rsci->cred);
}
static void rsc_put(struct kref *ref)
{
struct rsc *rsci = container_of(ref, struct rsc, h.ref);
rsc_free(rsci);
kfree(rsci);
}
static inline int
rsc_hash(struct rsc *rsci)
{
return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
}
static int
rsc_match(struct cache_head *a, struct cache_head *b)
{
struct rsc *new = container_of(a, struct rsc, h);
struct rsc *tmp = container_of(b, struct rsc, h);
return netobj_equal(&new->handle, &tmp->handle);
}
static void
rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
{
struct rsc *new = container_of(cnew, struct rsc, h);
struct rsc *tmp = container_of(ctmp, struct rsc, h);
new->handle.len = tmp->handle.len;
tmp->handle.len = 0;
new->handle.data = tmp->handle.data;
tmp->handle.data = NULL;
new->mechctx = NULL;
init_svc_cred(&new->cred);
}
static void
update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
{
struct rsc *new = container_of(cnew, struct rsc, h);
struct rsc *tmp = container_of(ctmp, struct rsc, h);
new->mechctx = tmp->mechctx;
tmp->mechctx = NULL;
memset(&new->seqdata, 0, sizeof(new->seqdata));
spin_lock_init(&new->seqdata.sd_lock);
new->cred = tmp->cred;
init_svc_cred(&tmp->cred);
}
static struct cache_head *
rsc_alloc(void)
{
struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
if (rsci)
return &rsci->h;
else
return NULL;
}
static int rsc_parse(struct cache_detail *cd,
char *mesg, int mlen)
{
/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
char *buf = mesg;
int id;
int len, rv;
struct rsc rsci, *rscp = NULL;
time_t expiry;
int status = -EINVAL;
struct gss_api_mech *gm = NULL;
memset(&rsci, 0, sizeof(rsci));
/* context handle */
len = qword_get(&mesg, buf, mlen);
if (len < 0) goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsci.handle, buf, len))
goto out;
rsci.h.flags = 0;
/* expiry */
expiry = get_expiry(&mesg);
status = -EINVAL;
if (expiry == 0)
goto out;
rscp = rsc_lookup(cd, &rsci);
if (!rscp)
goto out;
/* uid, or NEGATIVE */
rv = get_int(&mesg, &id);
if (rv == -EINVAL)
goto out;
if (rv == -ENOENT)
set_bit(CACHE_NEGATIVE, &rsci.h.flags);
else {
int N, i;
/*
* NOTE: we skip uid_valid()/gid_valid() checks here:
* instead, * -1 id's are later mapped to the
* (export-specific) anonymous id by nfsd_setuser.
*
* (But supplementary gid's get no such special
* treatment so are checked for validity here.)
*/
/* uid */
rsci.cred.cr_uid = make_kuid(&init_user_ns, id);
/* gid */
if (get_int(&mesg, &id))
goto out;
rsci.cred.cr_gid = make_kgid(&init_user_ns, id);
/* number of additional gid's */
if (get_int(&mesg, &N))
goto out;
if (N < 0 || N > NGROUPS_MAX)
goto out;
status = -ENOMEM;
rsci.cred.cr_group_info = groups_alloc(N);
if (rsci.cred.cr_group_info == NULL)
goto out;
/* gid's */
status = -EINVAL;
for (i=0; i<N; i++) {
kgid_t kgid;
if (get_int(&mesg, &id))
goto out;
kgid = make_kgid(&init_user_ns, id);
if (!gid_valid(kgid))
goto out;
rsci.cred.cr_group_info->gid[i] = kgid;
}
groups_sort(rsci.cred.cr_group_info);
/* mech name */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
status = -EOPNOTSUPP;
if (!gm)
goto out;
status = -EINVAL;
/* mech-specific data: */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
NULL, GFP_KERNEL);
if (status)
goto out;
/* get client name */
len = qword_get(&mesg, buf, mlen);
if (len > 0) {
rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
if (!rsci.cred.cr_principal) {
status = -ENOMEM;
goto out;
}
}
}
rsci.h.expiry_time = expiry;
rscp = rsc_update(cd, &rsci, rscp);
status = 0;
out:
rsc_free(&rsci);
if (rscp)
cache_put(&rscp->h, cd);
else
status = -ENOMEM;
return status;
}
static struct cache_detail rsc_cache_template = {
.owner = THIS_MODULE,
.hash_size = RSC_HASHMAX,
.name = "auth.rpcsec.context",
.cache_put = rsc_put,
.cache_parse = rsc_parse,
.match = rsc_match,
.init = rsc_init,
.update = update_rsc,
.alloc = rsc_alloc,
};
static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
{
struct cache_head *ch;
int hash = rsc_hash(item);
ch = sunrpc_cache_lookup(cd, &item->h, hash);
if (ch)
return container_of(ch, struct rsc, h);
else
return NULL;
}
static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
{
struct cache_head *ch;
int hash = rsc_hash(new);
ch = sunrpc_cache_update(cd, &new->h,
&old->h, hash);
if (ch)
return container_of(ch, struct rsc, h);
else
return NULL;
}
static struct rsc *
gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
{
struct rsc rsci;
struct rsc *found;
memset(&rsci, 0, sizeof(rsci));
if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
return NULL;
found = rsc_lookup(cd, &rsci);
rsc_free(&rsci);
if (!found)
return NULL;
if (cache_check(cd, &found->h, NULL))
return NULL;
return found;
}
/* Implements sequence number algorithm as specified in RFC 2203. */
static int
gss_check_seq_num(struct rsc *rsci, int seq_num)
{
struct gss_svc_seq_data *sd = &rsci->seqdata;
spin_lock(&sd->sd_lock);
if (seq_num > sd->sd_max) {
if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
memset(sd->sd_win,0,sizeof(sd->sd_win));
sd->sd_max = seq_num;
} else while (sd->sd_max < seq_num) {
sd->sd_max++;
__clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
}
__set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
goto ok;
} else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
goto drop;
}
/* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
goto drop;
ok:
spin_unlock(&sd->sd_lock);
return 1;
drop:
spin_unlock(&sd->sd_lock);
return 0;
}
static inline u32 round_up_to_quad(u32 i)
{
return (i + 3 ) & ~3;
}
static inline int
svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
{
int l;
if (argv->iov_len < 4)
return -1;
o->len = svc_getnl(argv);
l = round_up_to_quad(o->len);
if (argv->iov_len < l)
return -1;
o->data = argv->iov_base;
argv->iov_base += l;
argv->iov_len -= l;
return 0;
}
static inline int
svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
{
u8 *p;
if (resv->iov_len + 4 > PAGE_SIZE)
return -1;
svc_putnl(resv, o->len);
p = resv->iov_base + resv->iov_len;
resv->iov_len += round_up_to_quad(o->len);
if (resv->iov_len > PAGE_SIZE)
return -1;
memcpy(p, o->data, o->len);
memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
return 0;
}
/*
* Verify the checksum on the header and return SVC_OK on success.
* Otherwise, return SVC_DROP (in the case of a bad sequence number)
* or return SVC_DENIED and indicate error in authp.
*/
static int
gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
__be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
{
struct gss_ctx *ctx_id = rsci->mechctx;
struct xdr_buf rpchdr;
struct xdr_netobj checksum;
u32 flavor = 0;
struct kvec *argv = &rqstp->rq_arg.head[0];
struct kvec iov;
/* data to compute the checksum over: */
iov.iov_base = rpcstart;
iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
xdr_buf_from_iov(&iov, &rpchdr);
*authp = rpc_autherr_badverf;
if (argv->iov_len < 4)
return SVC_DENIED;
flavor = svc_getnl(argv);
if (flavor != RPC_AUTH_GSS)
return SVC_DENIED;
if (svc_safe_getnetobj(argv, &checksum))
return SVC_DENIED;
if (rqstp->rq_deferred) /* skip verification of revisited request */
return SVC_OK;
if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
*authp = rpcsec_gsserr_credproblem;
return SVC_DENIED;
}
if (gc->gc_seq > MAXSEQ) {
dprintk("RPC: svcauth_gss: discarding request with "
"large sequence number %d\n", gc->gc_seq);
*authp = rpcsec_gsserr_ctxproblem;
return SVC_DENIED;
}
if (!gss_check_seq_num(rsci, gc->gc_seq)) {
dprintk("RPC: svcauth_gss: discarding request with "
"old sequence number %d\n", gc->gc_seq);
return SVC_DROP;
}
return SVC_OK;
}
static int
gss_write_null_verf(struct svc_rqst *rqstp)
{
__be32 *p;
svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
/* don't really need to check if head->iov_len > PAGE_SIZE ... */
*p++ = 0;
if (!xdr_ressize_check(rqstp, p))
return -1;
return 0;
}
static int
gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
{
__be32 *xdr_seq;
u32 maj_stat;
struct xdr_buf verf_data;
struct xdr_netobj mic;
__be32 *p;
struct kvec iov;
int err = -1;
svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
xdr_seq = kmalloc(4, GFP_KERNEL);
if (!xdr_seq)
return -1;
*xdr_seq = htonl(seq);
iov.iov_base = xdr_seq;
iov.iov_len = 4;
xdr_buf_from_iov(&iov, &verf_data);
p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
mic.data = (u8 *)(p + 1);
maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
if (maj_stat != GSS_S_COMPLETE)
goto out;
*p++ = htonl(mic.len);
memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
p += XDR_QUADLEN(mic.len);
if (!xdr_ressize_check(rqstp, p))
goto out;
err = 0;
out:
kfree(xdr_seq);
return err;
}
struct gss_domain {
struct auth_domain h;
u32 pseudoflavor;
};
static struct auth_domain *
find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
{
char *name;
name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
if (!name)
return NULL;
return auth_domain_find(name);
}
static struct auth_ops svcauthops_gss;
u32 svcauth_gss_flavor(struct auth_domain *dom)
{
struct gss_domain *gd = container_of(dom, struct gss_domain, h);
return gd->pseudoflavor;
}
EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
struct auth_domain *
svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
{
struct gss_domain *new;
struct auth_domain *test;
int stat = -ENOMEM;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new)
goto out;
kref_init(&new->h.ref);
new->h.name = kstrdup(name, GFP_KERNEL);
if (!new->h.name)
goto out_free_dom;
new->h.flavour = &svcauthops_gss;
new->pseudoflavor = pseudoflavor;
test = auth_domain_lookup(name, &new->h);
if (test != &new->h) {
pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
name);
stat = -EADDRINUSE;
auth_domain_put(test);
goto out_free_name;
}
return test;
out_free_name:
kfree(new->h.name);
out_free_dom:
kfree(new);
out:
return ERR_PTR(stat);
}
EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
static inline int
read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
{
__be32 raw;
int status;
status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
if (status)
return status;
*obj = ntohl(raw);
return 0;
}
/* It would be nice if this bit of code could be shared with the client.
* Obstacles:
* The client shouldn't malloc(), would have to pass in own memory.
* The server uses base of head iovec as read pointer, while the
* client uses separate pointer. */
static int
unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
{
int stat = -EINVAL;
u32 integ_len, maj_stat;
struct xdr_netobj mic;
struct xdr_buf integ_buf;
/* Did we already verify the signature on the original pass through? */
if (rqstp->rq_deferred)
return 0;
integ_len = svc_getnl(&buf->head[0]);
if (integ_len & 3)
return stat;
if (integ_len > buf->len)
return stat;
if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
BUG();
/* copy out mic... */
if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
BUG();
if (mic.len > RPC_MAX_AUTH_SIZE)
return stat;
mic.data = kmalloc(mic.len, GFP_KERNEL);
if (!mic.data)
return stat;
if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
goto out;
maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
if (maj_stat != GSS_S_COMPLETE)
goto out;
if (svc_getnl(&buf->head[0]) != seq)
goto out;
/* trim off the mic and padding at the end before returning */
xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
stat = 0;
out:
kfree(mic.data);
return stat;
}
static inline int
total_buf_len(struct xdr_buf *buf)
{
return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
}
static void
fix_priv_head(struct xdr_buf *buf, int pad)
{
if (buf->page_len == 0) {
/* We need to adjust head and buf->len in tandem in this
* case to make svc_defer() work--it finds the original
* buffer start using buf->len - buf->head[0].iov_len. */
buf->head[0].iov_len -= pad;
}
}
static int
unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
{
u32 priv_len, maj_stat;
int pad, saved_len, remaining_len, offset;
clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
priv_len = svc_getnl(&buf->head[0]);
if (rqstp->rq_deferred) {
/* Already decrypted last time through! The sequence number
* check at out_seq is unnecessary but harmless: */
goto out_seq;
}
/* buf->len is the number of bytes from the original start of the
* request to the end, where head[0].iov_len is just the bytes
* not yet read from the head, so these two values are different: */
remaining_len = total_buf_len(buf);
if (priv_len > remaining_len)
return -EINVAL;
pad = remaining_len - priv_len;
buf->len -= pad;
fix_priv_head(buf, pad);
/* Maybe it would be better to give gss_unwrap a length parameter: */
saved_len = buf->len;
buf->len = priv_len;
maj_stat = gss_unwrap(ctx, 0, buf);
pad = priv_len - buf->len;
buf->len = saved_len;
buf->len -= pad;
/* The upper layers assume the buffer is aligned on 4-byte boundaries.
* In the krb5p case, at least, the data ends up offset, so we need to
* move it around. */
/* XXX: This is very inefficient. It would be better to either do
* this while we encrypt, or maybe in the receive code, if we can peak
* ahead and work out the service and mechanism there. */
offset = buf->head[0].iov_len % 4;
if (offset) {
buf->buflen = RPCSVC_MAXPAYLOAD;
xdr_shift_buf(buf, offset);
fix_priv_head(buf, pad);
}
if (maj_stat != GSS_S_COMPLETE)
return -EINVAL;
out_seq:
if (svc_getnl(&buf->head[0]) != seq)
return -EINVAL;
return 0;
}
struct gss_svc_data {
/* decoded gss client cred: */
struct rpc_gss_wire_cred clcred;
/* save a pointer to the beginning of the encoded verifier,
* for use in encryption/checksumming in svcauth_gss_release: */
__be32 *verf_start;
struct rsc *rsci;
};
static int
svcauth_gss_set_client(struct svc_rqst *rqstp)
{
struct gss_svc_data *svcdata = rqstp->rq_auth_data;
struct rsc *rsci = svcdata->rsci;
struct rpc_gss_wire_cred *gc = &svcdata->clcred;
int stat;
/*
* A gss export can be specified either by:
* export *(sec=krb5,rw)
* or by
* export gss/krb5(rw)
* The latter is deprecated; but for backwards compatibility reasons
* the nfsd code will still fall back on trying it if the former
* doesn't work; so we try to make both available to nfsd, below.
*/
rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
if (rqstp->rq_gssclient == NULL)
return SVC_DENIED;
stat = svcauth_unix_set_client(rqstp);
if (stat == SVC_DROP || stat == SVC_CLOSE)
return stat;
return SVC_OK;
}
static inline int
gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
struct xdr_netobj *out_handle, int *major_status)
{
struct rsc *rsci;
int rc;
if (*major_status != GSS_S_COMPLETE)
return gss_write_null_verf(rqstp);
rsci = gss_svc_searchbyctx(cd, out_handle);
if (rsci == NULL) {
*major_status = GSS_S_NO_CONTEXT;
return gss_write_null_verf(rqstp);
}
rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
cache_put(&rsci->h, cd);
return rc;
}
static inline int
gss_read_common_verf(struct rpc_gss_wire_cred *gc,
struct kvec *argv, __be32 *authp,
struct xdr_netobj *in_handle)
{
/* Read the verifier; should be NULL: */
*authp = rpc_autherr_badverf;
if (argv->iov_len < 2 * 4)
return SVC_DENIED;
if (svc_getnl(argv) != RPC_AUTH_NULL)
return SVC_DENIED;
if (svc_getnl(argv) != 0)
return SVC_DENIED;
/* Martial context handle and token for upcall: */
*authp = rpc_autherr_badcred;
if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
return SVC_DENIED;
if (dup_netobj(in_handle, &gc->gc_ctx))
return SVC_CLOSE;
*authp = rpc_autherr_badverf;
return 0;
}
static inline int
gss_read_verf(struct rpc_gss_wire_cred *gc,
struct kvec *argv, __be32 *authp,
struct xdr_netobj *in_handle,
struct xdr_netobj *in_token)
{
struct xdr_netobj tmpobj;
int res;
res = gss_read_common_verf(gc, argv, authp, in_handle);
if (res)
return res;
if (svc_safe_getnetobj(argv, &tmpobj)) {
kfree(in_handle->data);
return SVC_DENIED;
}
if (dup_netobj(in_token, &tmpobj)) {
kfree(in_handle->data);
return SVC_CLOSE;
}
return 0;
}
/* Ok this is really heavily depending on a set of semantics in
* how rqstp is set up by svc_recv and pages laid down by the
* server when reading a request. We are basically guaranteed that
* the token lays all down linearly across a set of pages, starting
* at iov_base in rq_arg.head[0] which happens to be the first of a
* set of pages stored in rq_pages[].
* rq_arg.head[0].iov_base will provide us the page_base to pass
* to the upcall.
*/
static inline int
gss_read_proxy_verf(struct svc_rqst *rqstp,
struct rpc_gss_wire_cred *gc, __be32 *authp,
struct xdr_netobj *in_handle,
struct gssp_in_token *in_token)
{
struct kvec *argv = &rqstp->rq_arg.head[0];
u32 inlen;
int res;
res = gss_read_common_verf(gc, argv, authp, in_handle);
if (res)
return res;
inlen = svc_getnl(argv);
if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
return SVC_DENIED;
in_token->pages = rqstp->rq_pages;
in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK;
in_token->page_len = inlen;
return 0;
}
static inline int
gss_write_resv(struct kvec *resv, size_t size_limit,
struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
int major_status, int minor_status)
{
if (resv->iov_len + 4 > size_limit)
return -1;
svc_putnl(resv, RPC_SUCCESS);
if (svc_safe_putnetobj(resv, out_handle))
return -1;
if (resv->iov_len + 3 * 4 > size_limit)
return -1;
svc_putnl(resv, major_status);
svc_putnl(resv, minor_status);
svc_putnl(resv, GSS_SEQ_WIN);
if (svc_safe_putnetobj(resv, out_token))
return -1;
return 0;
}
/*
* Having read the cred already and found we're in the context
* initiation case, read the verifier and initiate (or check the results
* of) upcalls to userspace for help with context initiation. If
* the upcall results are available, write the verifier and result.
* Otherwise, drop the request pending an answer to the upcall.
*/
static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
struct rpc_gss_wire_cred *gc, __be32 *authp)
{
struct kvec *argv = &rqstp->rq_arg.head[0];
struct kvec *resv = &rqstp->rq_res.head[0];
struct rsi *rsip, rsikey;
int ret;
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
memset(&rsikey, 0, sizeof(rsikey));
ret = gss_read_verf(gc, argv, authp,
&rsikey.in_handle, &rsikey.in_token);
if (ret)
return ret;
/* Perform upcall, or find upcall result: */
rsip = rsi_lookup(sn->rsi_cache, &rsikey);
rsi_free(&rsikey);
if (!rsip)
return SVC_CLOSE;
if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
/* No upcall result: */
return SVC_CLOSE;
ret = SVC_CLOSE;
/* Got an answer to the upcall; use it: */
if (gss_write_init_verf(sn->rsc_cache, rqstp,
&rsip->out_handle, &rsip->major_status))
goto out;
if (gss_write_resv(resv, PAGE_SIZE,
&rsip->out_handle, &rsip->out_token,
rsip->major_status, rsip->minor_status))
goto out;
ret = SVC_COMPLETE;
out:
cache_put(&rsip->h, sn->rsi_cache);
return ret;
}
static int gss_proxy_save_rsc(struct cache_detail *cd,
struct gssp_upcall_data *ud,
uint64_t *handle)
{
struct rsc rsci, *rscp = NULL;
static atomic64_t ctxhctr;
long long ctxh;
struct gss_api_mech *gm = NULL;
time_t expiry;
int status = -EINVAL;
memset(&rsci, 0, sizeof(rsci));
/* context handle */
status = -ENOMEM;
/* the handle needs to be just a unique id,
* use a static counter */
ctxh = atomic64_inc_return(&ctxhctr);
/* make a copy for the caller */
*handle = ctxh;
/* make a copy for the rsc cache */
if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
goto out;
rscp = rsc_lookup(cd, &rsci);
if (!rscp)
goto out;
/* creds */
if (!ud->found_creds) {
/* userspace seem buggy, we should always get at least a
* mapping to nobody */
dprintk("RPC: No creds found!\n");
goto out;
} else {
struct timespec64 boot;
/* steal creds */
rsci.cred = ud->creds;
memset(&ud->creds, 0, sizeof(struct svc_cred));
status = -EOPNOTSUPP;
/* get mech handle from OID */
gm = gss_mech_get_by_OID(&ud->mech_oid);
if (!gm)
goto out;
rsci.cred.cr_gss_mech = gm;
status = -EINVAL;
/* mech-specific data: */
status = gss_import_sec_context(ud->out_handle.data,
ud->out_handle.len,
gm, &rsci.mechctx,
&expiry, GFP_KERNEL);
if (status)
goto out;
getboottime64(&boot);
expiry -= boot.tv_sec;
}
rsci.h.expiry_time = expiry;
rscp = rsc_update(cd, &rsci, rscp);
status = 0;
out:
rsc_free(&rsci);
if (rscp)
cache_put(&rscp->h, cd);
else
status = -ENOMEM;
return status;
}
static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
struct rpc_gss_wire_cred *gc, __be32 *authp)
{
struct kvec *resv = &rqstp->rq_res.head[0];
struct xdr_netobj cli_handle;
struct gssp_upcall_data ud;
uint64_t handle;
int status;
int ret;
struct net *net = SVC_NET(rqstp);
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
memset(&ud, 0, sizeof(ud));
ret = gss_read_proxy_verf(rqstp, gc, authp,
&ud.in_handle, &ud.in_token);
if (ret)
return ret;
ret = SVC_CLOSE;
/* Perform synchronous upcall to gss-proxy */
status = gssp_accept_sec_context_upcall(net, &ud);
if (status)
goto out;
dprintk("RPC: svcauth_gss: gss major status = %d "
"minor status = %d\n",
ud.major_status, ud.minor_status);
switch (ud.major_status) {
case GSS_S_CONTINUE_NEEDED:
cli_handle = ud.out_handle;
break;
case GSS_S_COMPLETE:
status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
if (status)
goto out;
cli_handle.data = (u8 *)&handle;
cli_handle.len = sizeof(handle);
break;
default:
ret = SVC_CLOSE;
goto out;
}
/* Got an answer to the upcall; use it: */
if (gss_write_init_verf(sn->rsc_cache, rqstp,
&cli_handle, &ud.major_status))
goto out;
if (gss_write_resv(resv, PAGE_SIZE,
&cli_handle, &ud.out_token,
ud.major_status, ud.minor_status))
goto out;
ret = SVC_COMPLETE;
out:
gssp_free_upcall_data(&ud);
return ret;
}
/*
* Try to set the sn->use_gss_proxy variable to a new value. We only allow
* it to be changed if it's currently undefined (-1). If it's any other value
* then return -EBUSY unless the type wouldn't have changed anyway.
*/
static int set_gss_proxy(struct net *net, int type)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
int ret;
WARN_ON_ONCE(type != 0 && type != 1);
ret = cmpxchg(&sn->use_gss_proxy, -1, type);
if (ret != -1 && ret != type)
return -EBUSY;
return 0;
}
static bool use_gss_proxy(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
/* If use_gss_proxy is still undefined, then try to disable it */
if (sn->use_gss_proxy == -1)
set_gss_proxy(net, 0);
return sn->use_gss_proxy;
}
#ifdef CONFIG_PROC_FS
static ssize_t write_gssp(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct net *net = PDE_DATA(file_inode(file));
char tbuf[20];
unsigned long i;
int res;
if (*ppos || count > sizeof(tbuf)-1)
return -EINVAL;
if (copy_from_user(tbuf, buf, count))
return -EFAULT;
tbuf[count] = 0;
res = kstrtoul(tbuf, 0, &i);
if (res)
return res;
if (i != 1)
return -EINVAL;
res = set_gssp_clnt(net);
if (res)
return res;
res = set_gss_proxy(net, 1);
if (res)
return res;
return count;
}
static ssize_t read_gssp(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct net *net = PDE_DATA(file_inode(file));
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
unsigned long p = *ppos;
char tbuf[10];
size_t len;
snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
len = strlen(tbuf);
if (p >= len)
return 0;
len -= p;
if (len > count)
len = count;
if (copy_to_user(buf, (void *)(tbuf+p), len))
return -EFAULT;
*ppos += len;
return len;
}
static const struct file_operations use_gss_proxy_ops = {
.open = nonseekable_open,
.write = write_gssp,
.read = read_gssp,
};
static int create_use_gss_proxy_proc_entry(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct proc_dir_entry **p = &sn->use_gssp_proc;
sn->use_gss_proxy = -1;
*p = proc_create_data("use-gss-proxy", S_IFREG|S_IRUSR|S_IWUSR,
sn->proc_net_rpc,
&use_gss_proxy_ops, net);
if (!*p)
return -ENOMEM;
init_gssp_clnt(sn);
return 0;
}
static void destroy_use_gss_proxy_proc_entry(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
if (sn->use_gssp_proc) {
remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
clear_gssp_clnt(sn);
}
}
#else /* CONFIG_PROC_FS */
static int create_use_gss_proxy_proc_entry(struct net *net)
{
return 0;
}
static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
#endif /* CONFIG_PROC_FS */
/*
* Accept an rpcsec packet.
* If context establishment, punt to user space
* If data exchange, verify/decrypt
* If context destruction, handle here
* In the context establishment and destruction case we encode
* response here and return SVC_COMPLETE.
*/
static int
svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
{
struct kvec *argv = &rqstp->rq_arg.head[0];
struct kvec *resv = &rqstp->rq_res.head[0];
u32 crlen;
struct gss_svc_data *svcdata = rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc;
struct rsc *rsci = NULL;
__be32 *rpcstart;
__be32 *reject_stat = resv->iov_base + resv->iov_len;
int ret;
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",
argv->iov_len);
*authp = rpc_autherr_badcred;
if (!svcdata)
svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
if (!svcdata)
goto auth_err;
rqstp->rq_auth_data = svcdata;
svcdata->verf_start = NULL;
svcdata->rsci = NULL;
gc = &svcdata->clcred;
/* start of rpc packet is 7 u32's back from here:
* xid direction rpcversion prog vers proc flavour
*/
rpcstart = argv->iov_base;
rpcstart -= 7;
/* credential is:
* version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
* at least 5 u32s, and is preceded by length, so that makes 6.
*/
if (argv->iov_len < 5 * 4)
goto auth_err;
crlen = svc_getnl(argv);
if (svc_getnl(argv) != RPC_GSS_VERSION)
goto auth_err;
gc->gc_proc = svc_getnl(argv);
gc->gc_seq = svc_getnl(argv);
gc->gc_svc = svc_getnl(argv);
if (svc_safe_getnetobj(argv, &gc->gc_ctx))
goto auth_err;
if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
goto auth_err;
if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
goto auth_err;
*authp = rpc_autherr_badverf;
switch (gc->gc_proc) {
case RPC_GSS_PROC_INIT:
case RPC_GSS_PROC_CONTINUE_INIT:
if (use_gss_proxy(SVC_NET(rqstp)))
return svcauth_gss_proxy_init(rqstp, gc, authp);
else
return svcauth_gss_legacy_init(rqstp, gc, authp);
case RPC_GSS_PROC_DATA:
case RPC_GSS_PROC_DESTROY:
/* Look up the context, and check the verifier: */
*authp = rpcsec_gsserr_credproblem;
rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
if (!rsci)
goto auth_err;
switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
case SVC_OK:
break;
case SVC_DENIED:
goto auth_err;
case SVC_DROP:
goto drop;
}
break;
default:
*authp = rpc_autherr_rejectedcred;
goto auth_err;
}
/* now act upon the command: */
switch (gc->gc_proc) {
case RPC_GSS_PROC_DESTROY:
if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
goto auth_err;
rsci->h.expiry_time = seconds_since_boot();
set_bit(CACHE_NEGATIVE, &rsci->h.flags);
if (resv->iov_len + 4 > PAGE_SIZE)
goto drop;
svc_putnl(resv, RPC_SUCCESS);
goto complete;
case RPC_GSS_PROC_DATA:
*authp = rpcsec_gsserr_ctxproblem;
svcdata->verf_start = resv->iov_base + resv->iov_len;
if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
goto auth_err;
rqstp->rq_cred = rsci->cred;
get_group_info(rsci->cred.cr_group_info);
*authp = rpc_autherr_badcred;
switch (gc->gc_svc) {
case RPC_GSS_SVC_NONE:
break;
case RPC_GSS_SVC_INTEGRITY:
/* placeholders for length and seq. number: */
svc_putnl(resv, 0);
svc_putnl(resv, 0);
if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
gc->gc_seq, rsci->mechctx))
goto garbage_args;
rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
break;
case RPC_GSS_SVC_PRIVACY:
/* placeholders for length and seq. number: */
svc_putnl(resv, 0);
svc_putnl(resv, 0);
if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
gc->gc_seq, rsci->mechctx))
goto garbage_args;
rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
break;
default:
goto auth_err;
}
svcdata->rsci = rsci;
cache_get(&rsci->h);
rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
rsci->mechctx->mech_type,
GSS_C_QOP_DEFAULT,
gc->gc_svc);
ret = SVC_OK;
goto out;
}
garbage_args:
ret = SVC_GARBAGE;
goto out;
auth_err:
/* Restore write pointer to its original value: */
xdr_ressize_check(rqstp, reject_stat);
ret = SVC_DENIED;
goto out;
complete:
ret = SVC_COMPLETE;
goto out;
drop:
ret = SVC_CLOSE;
out:
if (rsci)
cache_put(&rsci->h, sn->rsc_cache);
return ret;
}
static __be32 *
svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
{
__be32 *p;
u32 verf_len;
p = gsd->verf_start;
gsd->verf_start = NULL;
/* If the reply stat is nonzero, don't wrap: */
if (*(p-1) != rpc_success)
return NULL;
/* Skip the verifier: */
p += 1;
verf_len = ntohl(*p++);
p += XDR_QUADLEN(verf_len);
/* move accept_stat to right place: */
memcpy(p, p + 2, 4);
/* Also don't wrap if the accept stat is nonzero: */
if (*p != rpc_success) {
resbuf->head[0].iov_len -= 2 * 4;
return NULL;
}
p++;
return p;
}
static inline int
svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
{
struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc = &gsd->clcred;
struct xdr_buf *resbuf = &rqstp->rq_res;
struct xdr_buf integ_buf;
struct xdr_netobj mic;
struct kvec *resv;
__be32 *p;
int integ_offset, integ_len;
int stat = -EINVAL;
p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
if (p == NULL)
goto out;
integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
integ_len = resbuf->len - integ_offset;
BUG_ON(integ_len % 4);
*p++ = htonl(integ_len);
*p++ = htonl(gc->gc_seq);
if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len))
BUG();
if (resbuf->tail[0].iov_base == NULL) {
if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
goto out_err;
resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+ resbuf->head[0].iov_len;
resbuf->tail[0].iov_len = 0;
}
resv = &resbuf->tail[0];
mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
goto out_err;
svc_putnl(resv, mic.len);
memset(mic.data + mic.len, 0,
round_up_to_quad(mic.len) - mic.len);
resv->iov_len += XDR_QUADLEN(mic.len) << 2;
/* not strictly required: */
resbuf->len += XDR_QUADLEN(mic.len) << 2;
BUG_ON(resv->iov_len > PAGE_SIZE);
out:
stat = 0;
out_err:
return stat;
}
static inline int
svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
{
struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc = &gsd->clcred;
struct xdr_buf *resbuf = &rqstp->rq_res;
struct page **inpages = NULL;
__be32 *p, *len;
int offset;
int pad;
p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
if (p == NULL)
return 0;
len = p++;
offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
*p++ = htonl(gc->gc_seq);
inpages = resbuf->pages;
/* XXX: Would be better to write some xdr helper functions for
* nfs{2,3,4}xdr.c that place the data right, instead of copying: */
/*
* If there is currently tail data, make sure there is
* room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
* the page, and move the current tail data such that
* there is RPC_MAX_AUTH_SIZE slack space available in
* both the head and tail.
*/
if (resbuf->tail[0].iov_base) {
BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
+ PAGE_SIZE);
BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
return -ENOMEM;
memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
resbuf->tail[0].iov_base,
resbuf->tail[0].iov_len);
resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
}
/*
* If there is no current tail data, make sure there is
* room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
* allotted page, and set up tail information such that there
* is RPC_MAX_AUTH_SIZE slack space available in both the
* head and tail.
*/
if (resbuf->tail[0].iov_base == NULL) {
if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
return -ENOMEM;
resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+ resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
resbuf->tail[0].iov_len = 0;
}
if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
return -ENOMEM;
*len = htonl(resbuf->len - offset);
pad = 3 - ((resbuf->len - offset - 1)&3);
p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
memset(p, 0, pad);
resbuf->tail[0].iov_len += pad;
resbuf->len += pad;
return 0;
}
static int
svcauth_gss_release(struct svc_rqst *rqstp)
{
struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc;
struct xdr_buf *resbuf = &rqstp->rq_res;
int stat = -EINVAL;
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
if (!gsd)
goto out;
gc = &gsd->clcred;
if (gc->gc_proc != RPC_GSS_PROC_DATA)
goto out;
/* Release can be called twice, but we only wrap once. */
if (gsd->verf_start == NULL)
goto out;
/* normally not set till svc_send, but we need it here: */
/* XXX: what for? Do we mess it up the moment we call svc_putu32
* or whatever? */
resbuf->len = total_buf_len(resbuf);
switch (gc->gc_svc) {
case RPC_GSS_SVC_NONE:
break;
case RPC_GSS_SVC_INTEGRITY:
stat = svcauth_gss_wrap_resp_integ(rqstp);
if (stat)
goto out_err;
break;
case RPC_GSS_SVC_PRIVACY:
stat = svcauth_gss_wrap_resp_priv(rqstp);
if (stat)
goto out_err;
break;
/*
* For any other gc_svc value, svcauth_gss_accept() already set
* the auth_error appropriately; just fall through:
*/
}
out:
stat = 0;
out_err:
if (rqstp->rq_client)
auth_domain_put(rqstp->rq_client);
rqstp->rq_client = NULL;
if (rqstp->rq_gssclient)
auth_domain_put(rqstp->rq_gssclient);
rqstp->rq_gssclient = NULL;
if (rqstp->rq_cred.cr_group_info)
put_group_info(rqstp->rq_cred.cr_group_info);
rqstp->rq_cred.cr_group_info = NULL;
if (gsd && gsd->rsci) {
cache_put(&gsd->rsci->h, sn->rsc_cache);
gsd->rsci = NULL;
}
return stat;
}
static void
svcauth_gss_domain_release(struct auth_domain *dom)
{
struct gss_domain *gd = container_of(dom, struct gss_domain, h);
kfree(dom->name);
kfree(gd);
}
static struct auth_ops svcauthops_gss = {
.name = "rpcsec_gss",
.owner = THIS_MODULE,
.flavour = RPC_AUTH_GSS,
.accept = svcauth_gss_accept,
.release = svcauth_gss_release,
.domain_release = svcauth_gss_domain_release,
.set_client = svcauth_gss_set_client,
};
static int rsi_cache_create_net(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct cache_detail *cd;
int err;
cd = cache_create_net(&rsi_cache_template, net);
if (IS_ERR(cd))
return PTR_ERR(cd);
err = cache_register_net(cd, net);
if (err) {
cache_destroy_net(cd, net);
return err;
}
sn->rsi_cache = cd;
return 0;
}
static void rsi_cache_destroy_net(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct cache_detail *cd = sn->rsi_cache;
sn->rsi_cache = NULL;
cache_purge(cd);
cache_unregister_net(cd, net);
cache_destroy_net(cd, net);
}
static int rsc_cache_create_net(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct cache_detail *cd;
int err;
cd = cache_create_net(&rsc_cache_template, net);
if (IS_ERR(cd))
return PTR_ERR(cd);
err = cache_register_net(cd, net);
if (err) {
cache_destroy_net(cd, net);
return err;
}
sn->rsc_cache = cd;
return 0;
}
static void rsc_cache_destroy_net(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
struct cache_detail *cd = sn->rsc_cache;
sn->rsc_cache = NULL;
cache_purge(cd);
cache_unregister_net(cd, net);
cache_destroy_net(cd, net);
}
int
gss_svc_init_net(struct net *net)
{
int rv;
rv = rsc_cache_create_net(net);
if (rv)
return rv;
rv = rsi_cache_create_net(net);
if (rv)
goto out1;
rv = create_use_gss_proxy_proc_entry(net);
if (rv)
goto out2;
return 0;
out2:
rsi_cache_destroy_net(net);
out1:
rsc_cache_destroy_net(net);
return rv;
}
void
gss_svc_shutdown_net(struct net *net)
{
destroy_use_gss_proxy_proc_entry(net);
rsi_cache_destroy_net(net);
rsc_cache_destroy_net(net);
}
int
gss_svc_init(void)
{
return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
}
void
gss_svc_shutdown(void)
{
svc_auth_unregister(RPC_AUTH_GSS);
}