cregit-Linux how code gets into the kernel

Release 4.16 crypto/crypto_user.c

Directory: crypto
/*
 * Crypto user configuration API.
 *
 * Copyright (C) 2011 secunet Security Networks AG
 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/cryptouser.h>
#include <linux/sched.h>
#include <net/netlink.h>
#include <linux/security.h>
#include <net/net_namespace.h>
#include <crypto/internal/skcipher.h>
#include <crypto/internal/rng.h>
#include <crypto/akcipher.h>
#include <crypto/kpp.h>

#include "internal.h"


#define null_terminated(x)	(strnlen(x, sizeof(x)) < sizeof(x))

static DEFINE_MUTEX(crypto_cfg_mutex);

/* The crypto netlink socket */

static struct sock *crypto_nlsk;


struct crypto_dump_info {
	
struct sk_buff *in_skb;
	
struct sk_buff *out_skb;
	
u32 nlmsg_seq;
	
u16 nlmsg_flags;
};


static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact) { struct crypto_alg *q, *alg = NULL; down_read(&crypto_alg_sem); list_for_each_entry(q, &crypto_alg_list, cra_list) { int match = 0; if ((q->cra_flags ^ p->cru_type) & p->cru_mask) continue; if (strlen(p->cru_driver_name)) match = !strcmp(q->cra_driver_name, p->cru_driver_name); else if (!exact) match = !strcmp(q->cra_name, p->cru_name); if (!match) continue; if (unlikely(!crypto_mod_get(q))) continue; alg = q; break; } up_read(&crypto_alg_sem); return alg; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert12086.33%133.33%
Herbert Xu1913.67%266.67%
Total139100.00%3100.00%


static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_cipher rcipher; strlcpy(rcipher.type, "cipher", sizeof(rcipher.type)); rcipher.blocksize = alg->cra_blocksize; rcipher.min_keysize = alg->cra_cipher.cia_min_keysize; rcipher.max_keysize = alg->cra_cipher.cia_max_keysize; if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER, sizeof(struct crypto_report_cipher), &rcipher)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert7984.04%125.00%
David S. Miller77.45%125.00%
Mathias Krause77.45%125.00%
Herbert Xu11.06%125.00%
Total94100.00%4100.00%


static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_comp rcomp; strlcpy(rcomp.type, "compression", sizeof(rcomp.type)); if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, sizeof(struct crypto_report_comp), &rcomp)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert5177.27%125.00%
David S. Miller710.61%125.00%
Mathias Krause710.61%125.00%
Herbert Xu11.52%125.00%
Total66100.00%4100.00%


static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_acomp racomp; strlcpy(racomp.type, "acomp", sizeof(racomp.type)); if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(struct crypto_report_acomp), &racomp)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu6598.48%150.00%
Herbert Xu11.52%150.00%
Total66100.00%2100.00%


static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_akcipher rakcipher; strlcpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, sizeof(struct crypto_report_akcipher), &rakcipher)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Tadeusz Struk6598.48%150.00%
Herbert Xu11.52%150.00%
Total66100.00%2100.00%


static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_kpp rkpp; strlcpy(rkpp.type, "kpp", sizeof(rkpp.type)); if (nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(struct crypto_report_kpp), &rkpp)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Salvatore Benedetto6598.48%150.00%
Herbert Xu11.52%150.00%
Total66100.00%2100.00%


static int crypto_report_one(struct crypto_alg *alg, struct crypto_user_alg *ualg, struct sk_buff *skb) { strlcpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name)); strlcpy(ualg->cru_driver_name, alg->cra_driver_name, sizeof(ualg->cru_driver_name)); strlcpy(ualg->cru_module_name, module_name(alg->cra_module), sizeof(ualg->cru_module_name)); ualg->cru_type = 0; ualg->cru_mask = 0; ualg->cru_flags = alg->cra_flags; ualg->cru_refcnt = refcount_read(&alg->cra_refcnt); if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) goto nla_put_failure; if (alg->cra_flags & CRYPTO_ALG_LARVAL) { struct crypto_report_larval rl; strlcpy(rl.type, "larval", sizeof(rl.type)); if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, sizeof(struct crypto_report_larval), &rl)) goto nla_put_failure; goto out; } if (alg->cra_type && alg->cra_type->report) { if (alg->cra_type->report(skb, alg)) goto nla_put_failure; goto out; } switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { case CRYPTO_ALG_TYPE_CIPHER: if (crypto_report_cipher(skb, alg)) goto nla_put_failure; break; case CRYPTO_ALG_TYPE_COMPRESS: if (crypto_report_comp(skb, alg)) goto nla_put_failure; break; case CRYPTO_ALG_TYPE_ACOMPRESS: if (crypto_report_acomp(skb, alg)) goto nla_put_failure; break; case CRYPTO_ALG_TYPE_AKCIPHER: if (crypto_report_akcipher(skb, alg)) goto nla_put_failure; break; case CRYPTO_ALG_TYPE_KPP: if (crypto_report_kpp(skb, alg)) goto nla_put_failure; break; } out: return 0; nla_put_failure: return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert22671.07%541.67%
Mathias Krause257.86%18.33%
Tadeusz Struk165.03%18.33%
Giovanni Cabiddu165.03%18.33%
Salvatore Benedetto165.03%18.33%
David S. Miller144.40%18.33%
Herbert Xu41.26%18.33%
Eric Biggers10.31%18.33%
Total318100.00%12100.00%


static int crypto_report_alg(struct crypto_alg *alg, struct crypto_dump_info *info) { struct sk_buff *in_skb = info->in_skb; struct sk_buff *skb = info->out_skb; struct nlmsghdr *nlh; struct crypto_user_alg *ualg; int err = 0; nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags); if (!nlh) { err = -EMSGSIZE; goto out; } ualg = nlmsg_data(nlh); err = crypto_report_one(alg, ualg, skb); if (err) { nlmsg_cancel(skb, nlh); goto out; } nlmsg_end(skb, nlh); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert13999.29%150.00%
Eric W. Biedermann10.71%150.00%
Total140100.00%2100.00%


static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, struct nlattr **attrs) { struct crypto_user_alg *p = nlmsg_data(in_nlh); struct crypto_alg *alg; struct sk_buff *skb; struct crypto_dump_info info; int err; if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) return -EINVAL; alg = crypto_alg_match(p, 0); if (!alg) return -ENOENT; err = -ENOMEM; skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); if (!skb) goto drop_alg; info.in_skb = in_skb; info.out_skb = skb; info.nlmsg_seq = in_nlh->nlmsg_seq; info.nlmsg_flags = 0; err = crypto_report_alg(alg, &info); drop_alg: crypto_mod_put(alg); if (err) return err; return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid); }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert14079.55%120.00%
Mathias Krause1910.80%120.00%
Herbert Xu169.09%240.00%
Eric W. Biedermann10.57%120.00%
Total176100.00%5100.00%


static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb) { struct crypto_alg *alg; struct crypto_dump_info info; int err; if (cb->args[0]) goto out; cb->args[0] = 1; info.in_skb = cb->skb; info.out_skb = skb; info.nlmsg_seq = cb->nlh->nlmsg_seq; info.nlmsg_flags = NLM_F_MULTI; list_for_each_entry(alg, &crypto_alg_list, cra_list) { err = crypto_report_alg(alg, &info); if (err) goto out_err; } out: return skb->len; out_err: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert118100.00%1100.00%
Total118100.00%1100.00%


static int crypto_dump_report_done(struct netlink_callback *cb) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert14100.00%1100.00%
Total14100.00%1100.00%


static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh, struct nlattr **attrs) { struct crypto_alg *alg; struct crypto_user_alg *p = nlmsg_data(nlh); struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; LIST_HEAD(list); if (!netlink_capable(skb, CAP_NET_ADMIN)) return -EPERM; if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) return -EINVAL; if (priority && !strlen(p->cru_driver_name)) return -EINVAL; alg = crypto_alg_match(p, 1); if (!alg) return -ENOENT; down_write(&crypto_alg_sem); crypto_remove_spawns(alg, &list, NULL); if (priority) alg->cra_priority = nla_get_u32(priority); up_write(&crypto_alg_sem); crypto_mod_put(alg); crypto_remove_final(&list); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert13076.02%120.00%
Mathias Krause2212.87%120.00%
Matthias-Christian Ott116.43%120.00%
Herbert Xu52.92%120.00%
Linus Torvalds31.75%120.00%
Total171100.00%5100.00%


static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, struct nlattr **attrs) { struct crypto_alg *alg; struct crypto_user_alg *p = nlmsg_data(nlh); int err; if (!netlink_capable(skb, CAP_NET_ADMIN)) return -EPERM; if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) return -EINVAL; alg = crypto_alg_match(p, 1); if (!alg) return -ENOENT; /* We can not unregister core algorithms such as aes-generic. * We would loose the reference in the crypto_alg_list to this algorithm * if we try to unregister. Unregistering such an algorithm without * removing the module is not possible, so we restrict to crypto * instances that are build from templates. */ err = -EINVAL; if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) goto drop_alg; err = -EBUSY; if (refcount_read(&alg->cra_refcnt) > 2) goto drop_alg; err = crypto_unregister_instance((struct crypto_instance *)alg); drop_alg: crypto_mod_put(alg); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert8252.56%225.00%
Herbert Xu3723.72%225.00%
Mathias Krause2214.10%112.50%
Matthias-Christian Ott117.05%112.50%
Linus Torvalds31.92%112.50%
Eric Biggers10.64%112.50%
Total156100.00%8100.00%


static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh, struct nlattr **attrs) { int exact = 0; const char *name; struct crypto_alg *alg; struct crypto_user_alg *p = nlmsg_data(nlh); struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; if (!netlink_capable(skb, CAP_NET_ADMIN)) return -EPERM; if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) return -EINVAL; if (strlen(p->cru_driver_name)) exact = 1; if (priority && !exact) return -EINVAL; alg = crypto_alg_match(p, exact); if (alg) { crypto_mod_put(alg); return -EEXIST; } if (strlen(p->cru_driver_name)) name = p->cru_driver_name; else name = p->cru_name; alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask); if (IS_ERR(alg)) return PTR_ERR(alg); down_write(&crypto_alg_sem); if (priority) alg->cra_priority = nla_get_u32(priority); up_write(&crypto_alg_sem); crypto_mod_put(alg); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert17979.91%116.67%
Mathias Krause229.82%116.67%
Matthias-Christian Ott114.91%116.67%
Herbert Xu73.12%116.67%
Linus Torvalds31.34%116.67%
Jesper Juhl20.89%116.67%
Total224100.00%6100.00%


static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh, struct nlattr **attrs) { if (!netlink_capable(skb, CAP_NET_ADMIN)) return -EPERM; return crypto_del_default_rng(); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu40100.00%1100.00%
Total40100.00%1100.00%

#define MSGSIZE(type) sizeof(struct type) static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = { [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0, }; static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = { [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32}, }; #undef MSGSIZE static const struct crypto_link { int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); int (*dump)(struct sk_buff *, struct netlink_callback *); int (*done)(struct netlink_callback *); } crypto_dispatch[CRYPTO_NR_MSGTYPES] = { [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg}, [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg}, [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg}, [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report, .dump = crypto_dump_report, .done = crypto_dump_report_done}, [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng }, };
static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, struct netlink_ext_ack *extack) { struct nlattr *attrs[CRYPTOCFGA_MAX+1]; const struct crypto_link *link; int type, err; type = nlh->nlmsg_type; if (type > CRYPTO_MSG_MAX) return -EINVAL; type -= CRYPTO_MSG_BASE; link = &crypto_dispatch[type]; if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) && (nlh->nlmsg_flags & NLM_F_DUMP))) { struct crypto_alg *alg; u16 dump_alloc = 0; if (link->dump == NULL) return -EINVAL; down_read(&crypto_alg_sem); list_for_each_entry(alg, &crypto_alg_list, cra_list) dump_alloc += CRYPTO_REPORT_MAXSIZE; { struct netlink_dump_control c = { .dump = link->dump, .done = link->done, .min_dump_alloc = dump_alloc, }; err = netlink_dump_start(crypto_nlsk, skb, nlh, &c); } up_read(&crypto_alg_sem); return err; } err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX, crypto_policy, extack); if (err < 0) return err; if (link->doit == NULL) return -EINVAL; return link->doit(skb, nlh, attrs); }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert18578.72%225.00%
Pablo Neira Ayuso2410.21%112.50%
Mathias Krause198.09%225.00%
Johannes Berg72.98%337.50%
Total235100.00%8100.00%


static void crypto_netlink_rcv(struct sk_buff *skb) { mutex_lock(&crypto_cfg_mutex); netlink_rcv_skb(skb, &crypto_user_rcv_msg); mutex_unlock(&crypto_cfg_mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert31100.00%1100.00%
Total31100.00%1100.00%


static int __init crypto_user_init(void) { struct netlink_kernel_cfg cfg = { .input = crypto_netlink_rcv, }; crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg); if (!crypto_nlsk) return -ENOMEM; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert3271.11%150.00%
Pablo Neira Ayuso1328.89%150.00%
Total45100.00%2100.00%


static void __exit crypto_user_exit(void) { netlink_kernel_release(crypto_nlsk); }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert14100.00%1100.00%
Total14100.00%1100.00%

module_init(crypto_user_init); module_exit(crypto_user_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); MODULE_DESCRIPTION("Crypto userspace configuration API"); MODULE_ALIAS("net-pf-16-proto-21");

Overall Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert182972.67%822.86%
Mathias Krause1626.44%514.29%
Herbert Xu1516.00%617.14%
Salvatore Benedetto843.34%12.86%
Tadeusz Struk843.34%12.86%
Giovanni Cabiddu813.22%12.86%
Pablo Neira Ayuso371.47%25.71%
Matthias-Christian Ott331.31%12.86%
David S. Miller281.11%12.86%
Linus Torvalds90.36%12.86%
Johannes Berg70.28%38.57%
Stephan Mueller50.20%12.86%
Eric Biggers20.08%12.86%
Jesper Juhl20.08%12.86%
Eric W. Biedermann20.08%12.86%
Jussi Kivilinna10.04%12.86%
Total2517100.00%35100.00%
Directory: crypto
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