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 /* 29 * Launch Java executables via exec(2). 30 * 31 * Java executables are platform-independent executable files 32 * based on the JAR file format. Executable JAR files contain a 33 * special 'extra field' header in the first file of the archive 34 * that marks the file as a true executable. The data in that field 35 * is used to pass additional run-time information to the Java VM. 36 * 37 * This handler looks for the appropriate magic number on the 38 * front of the file, checks that the JAR file is executable, then 39 * invokes the Java runtime environment to do the rest of the work. 40 */ 41 42 #include <sys/types.h> 43 #include <sys/proc.h> 44 #include <sys/vnode.h> 45 #include <sys/exec.h> 46 #include <sys/modctl.h> 47 #include <sys/cmn_err.h> 48 #include <sys/pathname.h> 49 50 /* 51 * These variables can be tweaked via /etc/system to allow prototyping 52 * and debugging. See PSARC/1997/123. 53 * 54 * Modified by PSARC/1999/012 to be Contract Private between Solaris and 55 * the Java Technology Group. It is expected that any future change to 56 * these variables be coordinated between the consolidations. 57 */ 58 #if defined(__sparc) 59 char *jexec = "/usr/java/jre/lib/sparc/jexec"; 60 #elif defined(__i386) || defined(__i386_COMPAT) 61 char *jexec = "/usr/java/jre/lib/i386/jexec"; 62 #else 63 #error "Unknown ISA" 64 #endif 65 char *jexec_arg = "-jar"; 66 67 /* 68 * ZIP/JAR file header information 69 */ 70 #define SIGSIZ 4 71 #define LOCSIG "PK\003\004" 72 #define LOCHDRSIZ 30 73 74 #define CH(b, n) (((unsigned char *)(b))[n]) 75 #define SH(b, n) (CH(b, n) | (CH(b, n+1) << 8)) 76 #define LG(b, n) (SH(b, n) | (SH(b, n+2) << 16)) 77 78 #define LOCNAM(b) (SH(b, 26)) /* filename size */ 79 #define LOCEXT(b) (SH(b, 28)) /* extra field size */ 80 81 #define XFHSIZ 4 /* header id, data size */ 82 #define XFHID(b) (SH(b, 0)) /* extract field header id */ 83 #define XFDATASIZ(b) (SH(b, 2)) /* extract field data size */ 84 #define XFJAVASIG 0xcafe /* java executables */ 85 86 /*ARGSUSED3*/ 87 static int 88 javaexec(vnode_t *vp, struct execa *uap, struct uarg *args, 89 struct intpdata *idatap, int level, long *execsz, int setid, 90 caddr_t execfile, cred_t *cred, int brand_action) 91 { 92 struct intpdata idata; 93 int error; 94 ssize_t resid; 95 vnode_t *nvp; 96 off_t xoff, xoff_end; 97 char lochdr[LOCHDRSIZ]; 98 struct pathname lookpn; 99 struct pathname resolvepn; 100 char *opath; 101 102 if (level) 103 return (ENOEXEC); /* no recursion */ 104 105 /* 106 * Read in the full local file header, and validate 107 * the initial signature. 108 */ 109 if ((error = vn_rdwr(UIO_READ, vp, lochdr, sizeof (lochdr), 110 0, UIO_SYSSPACE, 0, (rlim64_t)0, cred, &resid)) != 0) 111 return (error); 112 if (resid != 0 || strncmp(lochdr, LOCSIG, SIGSIZ) != 0) 113 return (ENOEXEC); 114 115 /* 116 * Ok, so this -is- a ZIP file, and might even be a JAR file. 117 * Is it a Java executable? 118 */ 119 xoff = sizeof (lochdr) + LOCNAM(lochdr); 120 xoff_end = xoff + LOCEXT(lochdr); 121 122 while (xoff < xoff_end) { 123 char xfhdr[XFHSIZ]; 124 125 if ((error = vn_rdwr(UIO_READ, vp, xfhdr, sizeof (xfhdr), 126 xoff, UIO_SYSSPACE, 0, (rlim64_t)0, cred, &resid)) != 0) 127 return (error); 128 if (resid != 0) 129 return (ENOEXEC); 130 if (XFHID(xfhdr) == XFJAVASIG) 131 break; 132 xoff += sizeof (xfhdr) + XFDATASIZ(xfhdr); 133 } 134 135 if (xoff >= xoff_end) 136 return (ENOEXEC); 137 138 /* 139 * Note: If we ever make setid execution work, we need to ensure 140 * that we use /dev/fd to avoid the classic setuid shell script 141 * security hole. 142 */ 143 if (setid) 144 return (EACCES); 145 146 /* 147 * Find and invoke the Java runtime environment on the file 148 */ 149 idata.intp = NULL; 150 idata.intp_name = jexec; 151 idata.intp_arg = jexec_arg; 152 if (error = pn_get(idata.intp_name, UIO_SYSSPACE, &lookpn)) 153 return (error); 154 pn_alloc(&resolvepn); 155 if (error = lookuppn(&lookpn, &resolvepn, FOLLOW, NULLVPP, &nvp)) { 156 pn_free(&resolvepn); 157 pn_free(&lookpn); 158 return (ENOEXEC); 159 } 160 opath = args->pathname; 161 args->pathname = resolvepn.pn_path; 162 /* don't free resolvepn until we are done with args */ 163 pn_free(&lookpn); 164 error = gexec(&nvp, uap, args, &idata, level + 1, execsz, execfile, 165 cred, EBA_NONE); 166 VN_RELE(nvp); 167 args->pathname = opath; 168 pn_free(&resolvepn); 169 return (error); 170 } 171 172 static struct execsw jexecsw = { 173 javamagicstr, 174 0, 175 4, 176 javaexec, 177 NULL 178 }; 179 180 static struct modlexec jmodlexec = { 181 &mod_execops, "exec for Java", &jexecsw 182 }; 183 184 static struct modlinkage jmodlinkage = { 185 MODREV_1, &jmodlexec, NULL 186 }; 187 188 int 189 _init(void) 190 { 191 return (mod_install(&jmodlinkage)); 192 } 193 194 int 195 _fini(void) 196 { 197 return (mod_remove(&jmodlinkage)); 198 } 199 200 int 201 _info(struct modinfo *modinfop) 202 { 203 return (mod_info(&jmodlinkage, modinfop)); 204 } 205