1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/param.h> 29 #include <sys/types.h> 30 #include <sys/ucred.h> 31 #include <sys/file.h> 32 #include <sys/errno.h> 33 #include <sys/systm.h> 34 #include <sys/stream.h> 35 #include <sys/strsun.h> 36 #include <sys/stropts.h> 37 #include <sys/vfs.h> 38 #include <sys/vnode.h> 39 #include <sys/cmn_err.h> 40 #include <sys/socket.h> 41 #include <sys/strsubr.h> 42 #include <c2/audit.h> 43 44 /* 45 * Getpeerucred system call implementation. 46 */ 47 static int 48 getpeerucred(int fd, void *buf) 49 { 50 file_t *fp; 51 struct ucred_s *uc; 52 vnode_t *vp; 53 k_peercred_t kpc; 54 int err; 55 int32_t rval; 56 57 kpc.pc_cr = NULL; 58 kpc.pc_cpid = -1; 59 60 if ((fp = getf(fd)) == NULL) 61 return (set_errno(EBADF)); 62 63 vp = fp->f_vnode; 64 65 switch (vp->v_type) { 66 case VFIFO: 67 case VSOCK: 68 err = VOP_IOCTL(vp, _I_GETPEERCRED, (intptr_t)&kpc, 69 FKIOCTL, CRED(), &rval); 70 break; 71 case VCHR: { 72 struct strioctl strioc; 73 74 if (vp->v_stream == NULL) { 75 err = ENOTSUP; 76 break; 77 } 78 strioc.ic_cmd = _I_GETPEERCRED; 79 strioc.ic_timout = INFTIM; 80 strioc.ic_len = (int)sizeof (k_peercred_t); 81 strioc.ic_dp = (char *)&kpc; 82 83 err = strdoioctl(vp->v_stream, &strioc, FNATIVE|FKIOCTL, 84 STR_NOSIG|K_TO_K, CRED(), &rval); 85 86 /* 87 * Map all unexpected error codes to ENOTSUP. 88 */ 89 switch (err) { 90 case 0: 91 case ENOTSUP: 92 case ENOTCONN: 93 case ENOMEM: 94 break; 95 default: 96 err = ENOTSUP; 97 break; 98 } 99 break; 100 } 101 default: 102 err = ENOTSUP; 103 break; 104 } 105 releasef(fd); 106 107 /* 108 * If someone gave us a credential, err will be 0. 109 */ 110 if (kpc.pc_cr != NULL) { 111 ASSERT(err == 0); 112 113 uc = cred2ucred(kpc.pc_cr, kpc.pc_cpid, NULL, CRED()); 114 115 crfree(kpc.pc_cr); 116 117 err = copyout(uc, buf, uc->uc_size); 118 119 kmem_free(uc, uc->uc_size); 120 121 if (err != 0) 122 return (set_errno(EFAULT)); 123 124 return (0); 125 } 126 return (set_errno(err)); 127 } 128 129 static int 130 ucred_get(pid_t pid, void *ubuf) 131 { 132 proc_t *p; 133 cred_t *pcr; 134 int err; 135 struct ucred_s *uc; 136 137 if (pid == P_MYID || pid == curproc->p_pid) { 138 pcr = CRED(); 139 crhold(pcr); 140 pid = curproc->p_pid; 141 } else { 142 cred_t *updcred = NULL; 143 144 if (pid < 0) 145 return (set_errno(EINVAL)); 146 147 if (audit_active) 148 updcred = cralloc(); 149 150 mutex_enter(&pidlock); 151 p = prfind(pid); 152 153 if (p == NULL) { 154 mutex_exit(&pidlock); 155 if (updcred != NULL) 156 crfree(updcred); 157 return (set_errno(ESRCH)); 158 } 159 160 /* 161 * Assure that audit data in cred is up-to-date. 162 * updcred will be used or freed. 163 */ 164 if (audit_active) 165 audit_update_context(p, updcred); 166 167 err = priv_proc_cred_perm(CRED(), p, &pcr, VREAD); 168 mutex_exit(&pidlock); 169 170 if (err != 0) 171 return (set_errno(err)); 172 } 173 174 uc = cred2ucred(pcr, pid, NULL, CRED()); 175 176 crfree(pcr); 177 178 err = copyout(uc, ubuf, uc->uc_size); 179 180 kmem_free(uc, uc->uc_size); 181 182 if (err) 183 return (set_errno(EFAULT)); 184 185 return (0); 186 } 187 188 int 189 ucredsys(int code, int obj, void *buf) 190 { 191 switch (code) { 192 case UCREDSYS_UCREDGET: 193 return (ucred_get((pid_t)obj, buf)); 194 case UCREDSYS_GETPEERUCRED: 195 return (getpeerucred(obj, buf)); 196 default: 197 return (set_errno(EINVAL)); 198 } 199 } 200 201 #ifdef _SYSCALL32_IMPL 202 int 203 ucredsys32(int arg1, int arg2, caddr32_t arg3) 204 { 205 return (ucredsys(arg1, arg2, (void *)(uintptr_t)arg3)); 206 } 207 #endif 208