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$SHELL if no arg in cado (tnx Davide)

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This commit is contained in:
Renzo Davoli 2016-11-29 09:35:26 +01:00
parent bd4f6e067f
commit 499a930cd3
3 changed files with 29 additions and 7 deletions
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5
cado.1
View File

@ -6,8 +6,8 @@ cado \- Capability Ambient DO
[
.I OPTIONS
]
[
.I capability_list
[
.I command
[
.I args
@ -29,6 +29,9 @@ If it is allowed for the current user to run processes with the requested capabi
type their password (or to authenticate themselves as required by pam unless \fB-S\fR or \fB--scado\fR).
Once the authentication succeeds, \fBcado\fR executes the command granting the required ambient capabilities.
If \fIcommand\fR is omitted cado launch the command specified in the environment
variable $SHELL.
The file /etc/cado.conf (see \fBcado.conf\fR(5)) defines which capabilities can be provided by \fBcado\fR to each user.
Cado itself is not a setuid executable, it uses the capability mechanism and it has an option to
set its own capabilities. So after each change in the /etc/cado.conf, the capability set should be

23
cado.c
View File

@ -64,7 +64,7 @@ struct option long_options[]={
void usage(char *progname) {
fprintf(stderr,"%s - execute a command in a different capability ambient\n\n",progname);
fprintf(stderr,"usage: %s OPTIONS capability_list command [args]\n\n",progname);
fprintf(stderr,"usage: %s OPTIONS capability_list [command [args]]\n\n",progname);
fprintf(stderr,"Options:\n");
fprintf(stderr," -h, --help display help message and exit\n");
fprintf(stderr," -f, --force do not display warnings, do what is allowed\n");
@ -87,6 +87,8 @@ int main(int argc, char*argv[])
int scado=0;
int pam_check_required = 1;
char copy_path[PATH_MAX] = "";
char *argvsh[]={getenv("SHELL"),NULL};
char **cmdargv;
while (1) {
int c=getopt_long(argc, argv, OPTSTRING, long_options, NULL);
@ -139,7 +141,7 @@ int main(int argc, char*argv[])
exit(0);
}
if (argc - optind < 2)
if (argc - optind < 1)
usage(progname);
/* parse the set of requested capabilities */
@ -158,11 +160,22 @@ int main(int argc, char*argv[])
optind++;
if (optind < argc)
cmdargv = argv + optind;
else {
cmdargv = argvsh;
if (cmdargv[0] == NULL) {
fprintf(stderr, "Error: $SHELL env variable not set.\n");
exit(1);
}
}
/* scado mode, check if there is a pre-authorization for the command */
if (scado) {
uint64_t scado_caps = cado_scado_check(user_groups[0], argv[optind], copy_path);
uint64_t scado_caps = cado_scado_check(user_groups[0], cmdargv[0], copy_path);
if (verbose) {
printf("Scado permitted capabilities for %s:\n", argv[optind]);
printf("Scado permitted capabilities for %s:\n", cmdargv[0]);
printcapset(scado_caps, " ");
}
okcaps &= scado_caps;
@ -203,6 +216,6 @@ int main(int argc, char*argv[])
}
/* exec the command in the new ambient capability environment */
execvp(copy_path[0] == 0 ? argv[optind] : copy_path, argv+optind);
execvp(copy_path[0] == 0 ? cmdargv[0] : copy_path, cmdargv);
exit(2);
}

8
cadrop.c
View File

@ -57,7 +57,13 @@ int main(int argc, char *argv[]) {
argv+=2;
break;
}
if (*argv == NULL) argv = argvsh;
if (*argv == NULL) {
if (*argvsh == NULL) {
fprintf(stderr, "Error: $SHELL env variable not set.\n");
exit(1);
}
argv = argvsh;
}
drop_ambient_cap(capset);
execvp(argv[0],argv);
perror("exec");