Marc Boucher | e6869a8 | 2000-03-20 06:03:29 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add OWNER matching support. */ |
| 2 | #include <stdio.h> |
| 3 | #include <netdb.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <getopt.h> |
| 7 | #include <pwd.h> |
| 8 | #include <grp.h> |
| 9 | |
| 10 | #include <iptables.h> |
| 11 | #include <linux/netfilter_ipv4/ipt_owner.h> |
| 12 | |
| 13 | /* Function which prints out usage message. */ |
| 14 | static void |
| 15 | help(void) |
| 16 | { |
| 17 | printf( |
| 18 | "OWNER match v%s options:\n" |
| 19 | "[!] --uid-owner userid Match local uid\n" |
| 20 | "[!] --gid-owner groupid Match local gid\n" |
| 21 | "[!] --pid-owner processid Match local pid\n" |
| 22 | "[!] --sid-owner sessionid Match local sid\n" |
| 23 | "\n", |
| 24 | NETFILTER_VERSION); |
| 25 | } |
| 26 | |
| 27 | static struct option opts[] = { |
| 28 | { "uid-owner", 1, 0, '1' }, |
| 29 | { "gid-owner", 1, 0, '2' }, |
| 30 | { "pid-owner", 1, 0, '3' }, |
| 31 | { "sid-owner", 1, 0, '4' }, |
| 32 | {0} |
| 33 | }; |
| 34 | |
| 35 | /* Initialize the match. */ |
| 36 | static void |
| 37 | init(struct ipt_entry_match *m, unsigned int *nfcache) |
| 38 | { |
| 39 | /* Can't cache this. */ |
| 40 | *nfcache |= NFC_UNKNOWN; |
| 41 | } |
| 42 | |
| 43 | /* Function which parses command options; returns true if it |
| 44 | ate an option */ |
| 45 | static int |
| 46 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 47 | const struct ipt_entry *entry, |
| 48 | unsigned int *nfcache, |
| 49 | struct ipt_entry_match **match) |
| 50 | { |
| 51 | struct ipt_owner_info *ownerinfo = (struct ipt_owner_info *)(*match)->data; |
| 52 | |
| 53 | switch (c) { |
| 54 | char *end; |
| 55 | struct passwd *pwd; |
| 56 | struct group *grp; |
| 57 | case '1': |
| 58 | if (check_inverse(optarg, &invert)) |
| 59 | optind++; |
| 60 | |
| 61 | if ((pwd = getpwnam(optarg))) |
| 62 | ownerinfo->uid = pwd->pw_uid; |
| 63 | else { |
| 64 | ownerinfo->uid = strtoul(optarg, &end, 0); |
| 65 | if (*end != '\0' || end == optarg) |
| 66 | exit_error(PARAMETER_PROBLEM, "Bad OWNER UID value `%s'", optarg); |
| 67 | } |
| 68 | if (invert) |
| 69 | ownerinfo->invert |= IPT_OWNER_UID; |
| 70 | ownerinfo->match |= IPT_OWNER_UID; |
| 71 | *flags = 1; |
| 72 | break; |
| 73 | |
| 74 | case '2': |
| 75 | if (check_inverse(optarg, &invert)) |
| 76 | optind++; |
| 77 | if ((grp = getgrnam(optarg))) |
| 78 | ownerinfo->gid = grp->gr_gid; |
| 79 | else { |
| 80 | ownerinfo->gid = strtoul(optarg, &end, 0); |
| 81 | if (*end != '\0' || end == optarg) |
| 82 | exit_error(PARAMETER_PROBLEM, "Bad OWNER GID value `%s'", optarg); |
| 83 | } |
| 84 | if (invert) |
| 85 | ownerinfo->invert |= IPT_OWNER_GID; |
| 86 | ownerinfo->match |= IPT_OWNER_GID; |
| 87 | *flags = 1; |
| 88 | break; |
| 89 | |
| 90 | case '3': |
| 91 | if (check_inverse(optarg, &invert)) |
| 92 | optind++; |
| 93 | ownerinfo->pid = strtoul(optarg, &end, 0); |
| 94 | if (*end != '\0' || end == optarg) |
| 95 | exit_error(PARAMETER_PROBLEM, "Bad OWNER PID value `%s'", optarg); |
| 96 | if (invert) |
| 97 | ownerinfo->invert |= IPT_OWNER_PID; |
| 98 | ownerinfo->match |= IPT_OWNER_PID; |
| 99 | *flags = 1; |
| 100 | break; |
| 101 | |
| 102 | case '4': |
| 103 | if (check_inverse(optarg, &invert)) |
| 104 | optind++; |
| 105 | ownerinfo->sid = strtoul(optarg, &end, 0); |
| 106 | if (*end != '\0' || end == optarg) |
| 107 | exit_error(PARAMETER_PROBLEM, "Bad OWNER SID value `%s'", optarg); |
| 108 | if (invert) |
| 109 | ownerinfo->invert |= IPT_OWNER_SID; |
| 110 | ownerinfo->match |= IPT_OWNER_SID; |
| 111 | *flags = 1; |
| 112 | break; |
| 113 | |
| 114 | default: |
| 115 | return 0; |
| 116 | } |
| 117 | return 1; |
| 118 | } |
| 119 | |
| 120 | static void |
| 121 | print_item(struct ipt_owner_info *info, u_int8_t flag, int numeric, char *label) |
| 122 | { |
| 123 | if(info->match & flag) { |
| 124 | |
| 125 | printf(label); |
| 126 | |
| 127 | if (info->invert & flag) |
| 128 | fputc('!', stdout); |
| 129 | |
| 130 | switch(info->match & flag) { |
| 131 | case IPT_OWNER_UID: |
| 132 | if(!numeric) { |
| 133 | struct passwd *pwd = getpwuid(info->uid); |
| 134 | |
| 135 | if(pwd && pwd->pw_name) { |
| 136 | printf("%s ", pwd->pw_name); |
| 137 | break; |
| 138 | } |
| 139 | /* FALLTHROUGH */ |
| 140 | } |
| 141 | printf("%u ", info->uid); |
| 142 | break; |
| 143 | case IPT_OWNER_GID: |
| 144 | if(!numeric) { |
| 145 | struct group *grp = getgrgid(info->gid); |
| 146 | |
| 147 | if(grp && grp->gr_name) { |
| 148 | printf("%s ", grp->gr_name); |
| 149 | break; |
| 150 | } |
| 151 | /* FALLTHROUGH */ |
| 152 | } |
| 153 | printf("%u ", info->gid); |
| 154 | break; |
| 155 | case IPT_OWNER_PID: |
| 156 | printf("%u ", info->pid); |
| 157 | break; |
| 158 | case IPT_OWNER_SID: |
| 159 | printf("%u ", info->sid); |
| 160 | break; |
| 161 | default: |
| 162 | break; |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /* Final check; must have specified --own. */ |
| 168 | static void |
| 169 | final_check(unsigned int flags) |
| 170 | { |
| 171 | if (!flags) |
| 172 | exit_error(PARAMETER_PROBLEM, |
| 173 | "OWNER match: You must specify one or more options"); |
| 174 | } |
| 175 | |
| 176 | /* Prints out the matchinfo. */ |
| 177 | static void |
| 178 | print(const struct ipt_ip *ip, |
| 179 | const struct ipt_entry_match *match, |
| 180 | int numeric) |
| 181 | { |
| 182 | struct ipt_owner_info *info = (struct ipt_owner_info *)match->data; |
| 183 | |
| 184 | print_item(info, IPT_OWNER_UID, numeric, "OWNER UID match "); |
| 185 | print_item(info, IPT_OWNER_GID, numeric, "OWNER GID match "); |
| 186 | print_item(info, IPT_OWNER_PID, numeric, "OWNER PID match "); |
| 187 | print_item(info, IPT_OWNER_SID, numeric, "OWNER SID match "); |
| 188 | } |
| 189 | |
| 190 | /* Saves the union ipt_matchinfo in parsable form to stdout. */ |
| 191 | static void |
| 192 | save(const struct ipt_ip *ip, const struct ipt_entry_match *match) |
| 193 | { |
| 194 | struct ipt_owner_info *info = (struct ipt_owner_info *)match->data; |
| 195 | |
| 196 | print_item(info, IPT_OWNER_UID, 0, "--uid-owner "); |
| 197 | print_item(info, IPT_OWNER_GID, 0, "--gid-owner "); |
| 198 | print_item(info, IPT_OWNER_PID, 0, "--pid-owner "); |
| 199 | print_item(info, IPT_OWNER_SID, 0, "--sid-owner "); |
| 200 | } |
| 201 | |
| 202 | struct iptables_match owner |
| 203 | = { NULL, |
| 204 | "owner", |
| 205 | NETFILTER_VERSION, |
Rusty Russell | 73f72f5 | 2000-07-03 10:17:57 +0000 | [diff] [blame] | 206 | IPT_ALIGN(sizeof(struct ipt_owner_info)), |
| 207 | IPT_ALIGN(sizeof(struct ipt_owner_info)), |
Marc Boucher | e6869a8 | 2000-03-20 06:03:29 +0000 | [diff] [blame] | 208 | &help, |
| 209 | &init, |
| 210 | &parse, |
| 211 | &final_check, |
| 212 | &print, |
| 213 | &save, |
| 214 | opts |
| 215 | }; |
| 216 | |
| 217 | void _init(void) |
| 218 | { |
| 219 | register_match(&owner); |
| 220 | } |